^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * AppArmor security module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This file contains AppArmor policy attachment and domain transitions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2002-2008 Novell/SUSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright 2009-2010 Canonical Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/fdtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/tracehook.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/personality.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/xattr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "include/audit.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "include/apparmorfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "include/cred.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "include/domain.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include "include/file.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include "include/ipc.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include "include/match.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include "include/path.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include "include/policy.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include "include/policy_ns.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * aa_free_domain_entries - free entries in a domain table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * @domain: the domain table to free (MAYBE NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) void aa_free_domain_entries(struct aa_domain *domain)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) if (domain) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) if (!domain->table)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) for (i = 0; i < domain->size; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) kfree_sensitive(domain->table[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) kfree_sensitive(domain->table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) domain->table = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * may_change_ptraced_domain - check if can change profile on ptraced task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * @to_label: profile to change to (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @info: message if there is an error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * Check if current is ptraced and if so if the tracing task is allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * to trace the new domain
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Returns: %0 or error if change not allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) static int may_change_ptraced_domain(struct aa_label *to_label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) const char **info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct task_struct *tracer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct aa_label *tracerl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) tracer = ptrace_parent(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (tracer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* released below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) tracerl = aa_get_task_label(tracer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /* not ptraced */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) if (!tracer || unconfined(tracerl))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) error = aa_may_ptrace(tracerl, to_label, PTRACE_MODE_ATTACH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) aa_put_label(tracerl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) *info = "ptrace prevents transition";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /**** TODO: dedup to aa_label_match - needs perm and dfa, merging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * specifically this is an exact copy of aa_label_match except
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * aa_compute_perms is replaced with aa_compute_fperms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * and policy.dfa with file.dfa
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) ****/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* match a profile and its associated ns component if needed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * Assumes visibility test has already been done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * If a subns profile is not to be matched should be prescreened with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * visibility test.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static inline unsigned int match_component(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) struct aa_profile *tp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bool stack, unsigned int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) const char *ns_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) state = aa_dfa_match(profile->file.dfa, state, "&");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (profile->ns == tp->ns)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return aa_dfa_match(profile->file.dfa, state, tp->base.hname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* try matching with namespace name and then profile */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) ns_name = aa_ns_name(profile->ns, tp->ns, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) state = aa_dfa_match_len(profile->file.dfa, state, ":", 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) state = aa_dfa_match(profile->file.dfa, state, ns_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) state = aa_dfa_match_len(profile->file.dfa, state, ":", 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return aa_dfa_match(profile->file.dfa, state, tp->base.hname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) * label_compound_match - find perms for full compound label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) * @profile: profile to find perms for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) * @label: label to check access permissions for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * @stack: whether this is a stacking request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * @start: state to start match in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * @subns: whether to do permission checks on components in a subns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * @request: permissions to request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * @perms: perms struct to set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) * Returns: 0 on success else ERROR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * For the label A//&B//&C this does the perm match for A//&B//&C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * @perms should be preinitialized with allperms OR a previous permission
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * check to be stacked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int label_compound_match(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) struct aa_label *label, bool stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned int state, bool subns, u32 request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct aa_perms *perms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct aa_profile *tp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct label_it i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct path_cond cond = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* find first subcomponent that is visible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) label_for_each(i, label, tp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!aa_ns_visible(profile->ns, tp->ns, subns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) state = match_component(profile, tp, stack, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* no component visible */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) *perms = allperms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) label_for_each_cont(i, label, tp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) if (!aa_ns_visible(profile->ns, tp->ns, subns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) state = aa_dfa_match(profile->file.dfa, state, "//&");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) state = match_component(profile, tp, false, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) *perms = aa_compute_fperms(profile->file.dfa, state, &cond);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) aa_apply_modes_to_perms(profile, perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if ((perms->allow & request) != request)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) *perms = nullperms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) * label_components_match - find perms for all subcomponents of a label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * @profile: profile to find perms for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * @label: label to check access permissions for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * @stack: whether this is a stacking request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * @start: state to start match in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * @subns: whether to do permission checks on components in a subns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * @request: permissions to request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * @perms: an initialized perms struct to add accumulation to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * Returns: 0 on success else ERROR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * For the label A//&B//&C this does the perm match for each of A and B and C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * @perms should be preinitialized with allperms OR a previous permission
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * check to be stacked.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static int label_components_match(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct aa_label *label, bool stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsigned int start, bool subns, u32 request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct aa_perms *perms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct aa_profile *tp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) struct label_it i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) struct aa_perms tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) struct path_cond cond = { };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) unsigned int state = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) /* find first subcomponent to test */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) label_for_each(i, label, tp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) if (!aa_ns_visible(profile->ns, tp->ns, subns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) state = match_component(profile, tp, stack, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) /* no subcomponents visible - no change in perms */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) tmp = aa_compute_fperms(profile->file.dfa, state, &cond);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) aa_apply_modes_to_perms(profile, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) aa_perms_accum(perms, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) label_for_each_cont(i, label, tp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (!aa_ns_visible(profile->ns, tp->ns, subns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) state = match_component(profile, tp, stack, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) if (!state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) tmp = aa_compute_fperms(profile->file.dfa, state, &cond);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) aa_apply_modes_to_perms(profile, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) aa_perms_accum(perms, &tmp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if ((perms->allow & request) != request)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) *perms = nullperms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) return -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * label_match - do a multi-component label match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) * @profile: profile to match against (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * @label: label to match (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * @stack: whether this is a stacking request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * @state: state to start in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) * @subns: whether to match subns components
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * @request: permission request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * @perms: Returns computed perms (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * Returns: the state the match finished in, may be the none matching state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static int label_match(struct aa_profile *profile, struct aa_label *label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) bool stack, unsigned int state, bool subns, u32 request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) struct aa_perms *perms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) *perms = nullperms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) error = label_compound_match(profile, label, stack, state, subns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) request, perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) *perms = allperms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return label_components_match(profile, label, stack, state, subns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) request, perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /******* end TODO: dedup *****/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) * change_profile_perms - find permissions for change_profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) * @profile: the current profile (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) * @target: label to transition to (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) * @stack: whether this is a stacking request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * @request: requested perms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * @start: state to start matching in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) * Returns: permission set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) * currently only matches full label A//&B//&C or individual components A, B, C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * not arbitrary combinations. Eg. A//&B, C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static int change_profile_perms(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) struct aa_label *target, bool stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) u32 request, unsigned int start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) struct aa_perms *perms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) if (profile_unconfined(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) perms->allow = AA_MAY_CHANGE_PROFILE | AA_MAY_ONEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) perms->audit = perms->quiet = perms->kill = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) /* TODO: add profile in ns screening */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return label_match(profile, target, stack, start, true, request, perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) * aa_xattrs_match - check whether a file matches the xattrs defined in profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) * @bprm: binprm struct for the process to validate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * @profile: profile to match against (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * @state: state to start match in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * Returns: number of extended attributes that matched, or < 0 on error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static int aa_xattrs_match(const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) struct aa_profile *profile, unsigned int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) ssize_t size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct dentry *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) char *value = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) int value_size = 0, ret = profile->xattr_count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (!bprm || !profile->xattr_count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) might_sleep();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) /* transition from exec match to xattr set */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) state = aa_dfa_outofband_transition(profile->xmatch, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) d = bprm->file->f_path.dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) for (i = 0; i < profile->xattr_count; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) size = vfs_getxattr_alloc(d, profile->xattrs[i], &value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) value_size, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) if (size >= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) u32 perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) * Check the xattr presence before value. This ensure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * that not present xattr can be distinguished from a 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * length value or rule that matches any value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) state = aa_dfa_null_transition(profile->xmatch, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) /* Check xattr value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) state = aa_dfa_match_len(profile->xmatch, state, value,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) perm = dfa_user_allow(profile->xmatch, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) if (!(perm & MAY_EXEC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) /* transition to next element */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) state = aa_dfa_outofband_transition(profile->xmatch, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) if (size < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * No xattr match, so verify if transition to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) * next element was valid. IFF so the xattr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) * was optional.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (!state) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) /* don't count missing optional xattr as matched */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) ret--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) kfree(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) * find_attach - do attachment search for unconfined processes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) * @bprm - binprm structure of transitioning task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) * @ns: the current namespace (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) * @head - profile list to walk (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) * @name - to match against (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) * @info - info message if there was an error (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) * Do a linear search on the profiles in the list. There is a matching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) * preference where an exact match is preferred over a name which uses
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) * expressions to match, and matching expressions with the greatest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) * xmatch_len are preferred.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * Requires: @head not be shared or have appropriate locks held
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * Returns: label or NULL if no match found
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static struct aa_label *find_attach(const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) struct aa_ns *ns, struct list_head *head,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) const char *name, const char **info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) int candidate_len = 0, candidate_xattrs = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) bool conflict = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) struct aa_profile *profile, *candidate = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) AA_BUG(!name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) AA_BUG(!head);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) list_for_each_entry_rcu(profile, head, base.list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if (profile->label.flags & FLAG_NULL &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) &profile->label == ns_unconfined(profile->ns))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) /* Find the "best" matching profile. Profiles must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) * match the path and extended attributes (if any)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * associated with the file. A more specific path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) * match will be preferred over a less specific one,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) * and a match with more matching extended attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) * will be preferred over one with fewer. If the best
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) * match has both the same level of path specificity
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) * and the same number of matching extended attributes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * as another profile, signal a conflict and refuse to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) * match.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (profile->xmatch) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) unsigned int state, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) u32 perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) state = aa_dfa_leftmatch(profile->xmatch, DFA_START,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) name, &count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) perm = dfa_user_allow(profile->xmatch, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) /* any accepting state means a valid match. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) if (perm & MAY_EXEC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (count < candidate_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (bprm && profile->xattr_count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) long rev = READ_ONCE(ns->revision);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (!aa_get_profile_not0(profile))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) goto restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) ret = aa_xattrs_match(bprm, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) aa_put_profile(profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (rev !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) READ_ONCE(ns->revision))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) /* policy changed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) goto restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * Fail matching if the xattrs don't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) * TODO: allow for more flexible best match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) * The new match isn't more specific
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * than the current best match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (count == candidate_len &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) ret <= candidate_xattrs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) /* Match is equivalent, so conflict */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) if (ret == candidate_xattrs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) conflict = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) /* Either the same length with more matching
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) * xattrs, or a longer match
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) candidate = profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) candidate_len = profile->xmatch_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) candidate_xattrs = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) conflict = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) } else if (!strcmp(profile->base.name, name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * old exact non-re match, without conditionals such
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * as xattrs. no more searching required
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) candidate = profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) if (!candidate || conflict) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) if (conflict)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) *info = "conflicting profile attachments";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) candidate = aa_get_newest_profile(candidate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) return &candidate->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) static const char *next_name(int xtype, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) * x_table_lookup - lookup an x transition name via transition table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) * @profile: current profile (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) * @xindex: index into x transition table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) * @name: returns: name tested to find label (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) * Returns: refcounted label, or NULL on failure (MAYBE NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct aa_label *x_table_lookup(struct aa_profile *profile, u32 xindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) const char **name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) struct aa_label *label = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) u32 xtype = xindex & AA_X_TYPE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) int index = xindex & AA_X_INDEX_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) AA_BUG(!name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) /* index is guaranteed to be in range, validated at load time */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) /* TODO: move lookup parsing to unpack time so this is a straight
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) * index into the resultant label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) for (*name = profile->file.trans.table[index]; !label && *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) *name = next_name(xtype, *name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) if (xindex & AA_X_CHILD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) struct aa_profile *new_profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /* release by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) new_profile = aa_find_child(profile, *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) if (new_profile)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) label = &new_profile->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) label = aa_label_parse(&profile->label, *name, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) if (IS_ERR(label))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) label = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) /* released by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) return label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * x_to_label - get target label for a given xindex
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) * @profile: current profile (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) * @bprm: binprm structure of transitioning task
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) * @name: name to lookup (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) * @xindex: index into x transition table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) * @lookupname: returns: name used in lookup if one was specified (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * find label for a transition index
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * Returns: refcounted label or NULL if not found available
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) static struct aa_label *x_to_label(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) const char *name, u32 xindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) const char **lookupname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) const char **info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) struct aa_label *new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) struct aa_ns *ns = profile->ns;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) u32 xtype = xindex & AA_X_TYPE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) const char *stack = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) switch (xtype) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) case AA_X_NONE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) /* fail exec unless ix || ux fallback - handled by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) *lookupname = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) case AA_X_TABLE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) /* TODO: fix when perm mapping done at unload */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) stack = profile->file.trans.table[xindex & AA_X_INDEX_MASK];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (*stack != '&') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) /* released by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) new = x_table_lookup(profile, xindex, lookupname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) stack = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) fallthrough; /* to X_NAME */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) case AA_X_NAME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) if (xindex & AA_X_CHILD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) /* released by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) new = find_attach(bprm, ns, &profile->base.profiles,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) name, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /* released by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) new = find_attach(bprm, ns, &ns->base.profiles,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) name, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) *lookupname = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) if (!new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (xindex & AA_X_INHERIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) /* (p|c|n)ix - don't change profile but do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) * use the newest version
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) *info = "ix fallback";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) /* no profile && no error */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) new = aa_get_newest_label(&profile->label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) } else if (xindex & AA_X_UNCONFINED) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) new = aa_get_newest_label(ns_unconfined(profile->ns));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) *info = "ux fallback";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) if (new && stack) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* base the stack on post domain transition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) struct aa_label *base = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) new = aa_label_parse(base, stack, GFP_KERNEL, true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (IS_ERR(new))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) aa_put_label(base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) /* released by caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) static struct aa_label *profile_transition(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) char *buffer, struct path_cond *cond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) bool *secure_exec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct aa_label *new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) const char *info = NULL, *name = NULL, *target = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) unsigned int state = profile->file.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) struct aa_perms perms = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) bool nonewprivs = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) AA_BUG(!profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) AA_BUG(!bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) AA_BUG(!buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) error = aa_path_name(&bprm->file->f_path, profile->path_flags, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) &name, &info, profile->disconnected);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) if (profile_unconfined(profile) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) (profile->label.flags & FLAG_IX_ON_NAME_ERROR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) AA_DEBUG("name lookup ix on error");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) new = aa_get_newest_label(&profile->label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) name = bprm->filename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) if (profile_unconfined(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) new = find_attach(bprm, profile->ns,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) &profile->ns->base.profiles, name, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) if (new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) AA_DEBUG("unconfined attached to new label");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) AA_DEBUG("unconfined exec no attachment");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) return aa_get_newest_label(&profile->label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* find exec permissions for name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) state = aa_str_perms(profile->file.dfa, state, name, cond, &perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) if (perms.allow & MAY_EXEC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) /* exec permission determine how to transition */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) new = x_to_label(profile, bprm, name, perms.xindex, &target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) if (new && new->proxy == profile->label.proxy && info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) /* hack ix fallback - improve how this is detected */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) } else if (!new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) info = "profile transition not found";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) /* remove MAY_EXEC to audit as failure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) perms.allow &= ~MAY_EXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) } else if (COMPLAIN_MODE(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) /* no exec permission - learning mode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) struct aa_profile *new_profile = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) new_profile = aa_new_null_profile(profile, false, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) if (!new_profile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) info = "could not create null profile";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) new = &new_profile->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) perms.xindex |= AA_X_UNSAFE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) /* fail exec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) if (!(perms.xindex & AA_X_UNSAFE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) if (DEBUG_ON) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) dbg_printk("apparmor: scrubbing environment variables"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) " for %s profile=", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) aa_label_printk(new, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) dbg_printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) *secure_exec = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) audit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) aa_audit_file(profile, &perms, OP_EXEC, MAY_EXEC, name, target, new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) cond->uid, info, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) if (!new || nonewprivs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) aa_put_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) static int profile_onexec(struct aa_profile *profile, struct aa_label *onexec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) bool stack, const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) char *buffer, struct path_cond *cond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) bool *secure_exec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) unsigned int state = profile->file.start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) struct aa_perms perms = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) const char *xname = NULL, *info = "change_profile onexec";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) int error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) AA_BUG(!profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) AA_BUG(!onexec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) AA_BUG(!bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) AA_BUG(!buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) if (profile_unconfined(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) /* change_profile on exec already granted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) * NOTE: Domain transitions from unconfined are allowed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) * even when no_new_privs is set because this aways results
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) * in a further reduction of permissions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) error = aa_path_name(&bprm->file->f_path, profile->path_flags, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) &xname, &info, profile->disconnected);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) if (profile_unconfined(profile) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) (profile->label.flags & FLAG_IX_ON_NAME_ERROR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) AA_DEBUG("name lookup ix on error");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) xname = bprm->filename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) /* find exec permissions for name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) state = aa_str_perms(profile->file.dfa, state, xname, cond, &perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) if (!(perms.allow & AA_MAY_ONEXEC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) info = "no change_onexec valid for executable";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) /* test if this exec can be paired with change_profile onexec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) * onexec permission is linked to exec with a standard pairing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) * exec\0change_profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) state = aa_dfa_null_transition(profile->file.dfa, state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) error = change_profile_perms(profile, onexec, stack, AA_MAY_ONEXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) state, &perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) perms.allow &= ~AA_MAY_ONEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) if (!(perms.xindex & AA_X_UNSAFE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) if (DEBUG_ON) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) dbg_printk("apparmor: scrubbing environment "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) "variables for %s label=", xname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) aa_label_printk(onexec, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) dbg_printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) *secure_exec = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) audit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) return aa_audit_file(profile, &perms, OP_EXEC, AA_MAY_ONEXEC, xname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) NULL, onexec, cond->uid, info, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) /* ensure none ns domain transitions are correctly applied with onexec */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) static struct aa_label *handle_onexec(struct aa_label *label,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) struct aa_label *onexec, bool stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) const struct linux_binprm *bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) char *buffer, struct path_cond *cond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) bool *unsafe)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) struct aa_profile *profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) struct aa_label *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) AA_BUG(!label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) AA_BUG(!onexec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) AA_BUG(!bprm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) AA_BUG(!buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) if (!stack) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) error = fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) profile_onexec(profile, onexec, stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) bprm, buffer, cond, unsafe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) aa_get_newest_label(onexec),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) profile_transition(profile, bprm, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) cond, unsafe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) /* TODO: determine how much we want to loosen this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) error = fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) profile_onexec(profile, onexec, stack, bprm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) buffer, cond, unsafe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) aa_label_merge(&profile->label, onexec,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) GFP_KERNEL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) profile_transition(profile, bprm, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) cond, unsafe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) /* TODO: get rid of GLOBAL_ROOT_UID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) error = fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) aa_audit_file(profile, &nullperms, OP_CHANGE_ONEXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) AA_MAY_ONEXEC, bprm->filename, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) onexec, GLOBAL_ROOT_UID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) "failed to build target label", -ENOMEM));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) * apparmor_bprm_creds_for_exec - Update the new creds on the bprm struct
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) * @bprm: binprm for the exec (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) * Returns: %0 or error on failure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) * TODO: once the other paths are done see if we can't refactor into a fn
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) int apparmor_bprm_creds_for_exec(struct linux_binprm *bprm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) struct aa_task_ctx *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) struct aa_label *label, *new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856) struct aa_profile *profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) char *buffer = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) const char *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) bool unsafe = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) struct path_cond cond = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) file_inode(bprm->file)->i_uid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) file_inode(bprm->file)->i_mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) ctx = task_ctx(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) AA_BUG(!cred_label(bprm->cred));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) AA_BUG(!ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) label = aa_get_newest_label(cred_label(bprm->cred));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) * Detect no new privs being set, and store the label it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) * occurred under. Ideally this would happen when nnp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) * is set but there isn't a good way to do that yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) * Testing for unconfined must be done before the subset test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) if ((bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) && !unconfined(label) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) !ctx->nnp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) ctx->nnp = aa_get_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) /* buffer freed below, name is pointer into buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) buffer = aa_get_buffer(false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) if (!buffer) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) /* Test for onexec first as onexec override other x transitions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) if (ctx->onexec)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) new = handle_onexec(label, ctx->onexec, ctx->token,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) bprm, buffer, &cond, &unsafe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) new = fn_label_build(label, profile, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) profile_transition(profile, bprm, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) &cond, &unsafe));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) AA_BUG(!new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) if (IS_ERR(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) error = PTR_ERR(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) } else if (!new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) /* Policy has specified a domain transitions. If no_new_privs and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) * confined ensure the transition is to confinement that is subset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) * of the confinement when the task entered no new privs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) * NOTE: Domain transitions from unconfined and to stacked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) * subsets are allowed even when no_new_privs is set because this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) * aways results in a further reduction of permissions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) if ((bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) !unconfined(label) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) !aa_label_is_unconfined_subset(new, ctx->nnp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) info = "no new privs";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) if (bprm->unsafe & LSM_UNSAFE_SHARE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) /* FIXME: currently don't mediate shared state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) if (bprm->unsafe & (LSM_UNSAFE_PTRACE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) /* TODO: test needs to be profile of label to new */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) error = may_change_ptraced_domain(new, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) if (unsafe) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) if (DEBUG_ON) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) dbg_printk("scrubbing environment variables for %s "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) "label=", bprm->filename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) aa_label_printk(new, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) dbg_printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) bprm->secureexec = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) if (label->proxy != new->proxy) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) /* when transitioning clear unsafe personality bits */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) if (DEBUG_ON) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) dbg_printk("apparmor: clearing unsafe personality "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) "bits. %s label=", bprm->filename);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) aa_label_printk(new, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) dbg_printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) bprm->per_clear |= PER_CLEAR_ON_SETID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) aa_put_label(cred_label(bprm->cred));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) /* transfer reference, released when cred is freed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) set_cred_label(bprm->cred, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) aa_put_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) aa_put_buffer(buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) audit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) error = fn_for_each(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) aa_audit_file(profile, &nullperms, OP_EXEC, MAY_EXEC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) bprm->filename, NULL, new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) file_inode(bprm->file)->i_uid, info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971) error));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) aa_put_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) * Functions for self directed profile change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) /* helper fn for change_hat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) * Returns: label for hat transition OR ERR_PTR. Does NOT return NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) static struct aa_label *build_change_hat(struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) const char *name, bool sibling)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) struct aa_profile *root, *hat = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) const char *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) if (sibling && PROFILE_IS_HAT(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) root = aa_get_profile_rcu(&profile->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) } else if (!sibling && !PROFILE_IS_HAT(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) root = aa_get_profile(profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) info = "conflicting target types";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) hat = aa_find_child(root, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) if (!hat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) if (COMPLAIN_MODE(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) hat = aa_new_null_profile(profile, true, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) if (!hat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) info = "failed null profile create";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) aa_put_profile(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) audit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) aa_audit_file(profile, &nullperms, OP_CHANGE_HAT, AA_MAY_CHANGEHAT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) name, hat ? hat->base.hname : NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) hat ? &hat->label : NULL, GLOBAL_ROOT_UID, info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) if (!hat || (error && error != -ENOENT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) /* if hat && error - complain mode, already audited and we adjust for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) * complain mode allow by returning hat->label
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) return &hat->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) /* helper fn for changing into a hat
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) * Returns: label for hat transition or ERR_PTR. Does not return NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) static struct aa_label *change_hat(struct aa_label *label, const char *hats[],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) int count, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) struct aa_profile *profile, *root, *hat = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) struct aa_label *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) struct label_it it;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) bool sibling = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) const char *name, *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) int i, error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) AA_BUG(!label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) AA_BUG(!hats);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) AA_BUG(count < 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) if (PROFILE_IS_HAT(labels_profile(label)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) sibling = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) /*find first matching hat */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) for (i = 0; i < count && !hat; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) name = hats[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) label_for_each_in_ns(it, labels_ns(label), label, profile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) if (sibling && PROFILE_IS_HAT(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) root = aa_get_profile_rcu(&profile->parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) } else if (!sibling && !PROFILE_IS_HAT(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) root = aa_get_profile(profile);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) } else { /* conflicting change type */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) info = "conflicting targets types";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) hat = aa_find_child(root, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) aa_put_profile(root);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) if (!hat) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) if (!COMPLAIN_MODE(profile))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) goto outer_continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) /* complain mode succeed as if hat */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) } else if (!PROFILE_IS_HAT(hat)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) info = "target not hat";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) aa_put_profile(hat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) aa_put_profile(hat);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) /* found a hat for all profiles in ns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) goto build;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) outer_continue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) /* no hats that match, find appropriate error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) * In complain mode audit of the failure is based off of the first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) * hat supplied. This is done due how userspace interacts with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) * change_hat.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) label_for_each_in_ns(it, labels_ns(label), label, profile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) if (!list_empty(&profile->base.profiles)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) info = "hat not found";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) info = "no hats defined";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) error = -ECHILD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) label_for_each_in_ns(it, labels_ns(label), label, profile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) * no target as it has failed to be found or built
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) * change_hat uses probing and should not log failures
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) * related to missing hats
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107) /* TODO: get rid of GLOBAL_ROOT_UID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) if (count > 1 || COMPLAIN_MODE(profile)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) aa_audit_file(profile, &nullperms, OP_CHANGE_HAT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) AA_MAY_CHANGEHAT, name, NULL, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) GLOBAL_ROOT_UID, info, error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) return ERR_PTR(error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) build:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) build_change_hat(profile, name, sibling),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) aa_get_label(&profile->label));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) if (!new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) info = "label build failed";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) } /* else if (IS_ERR) build_change_hat has logged error so return new */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) return new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) * aa_change_hat - change hat to/from subprofile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) * @hats: vector of hat names to try changing into (MAYBE NULL if @count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) * @count: number of hat names in @hats
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) * @token: magic value to validate the hat change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) * @flags: flags affecting behavior of the change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) * Returns %0 on success, error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) * Change to the first profile specified in @hats that exists, and store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) * the @hat_magic in the current task context. If the count == 0 and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) * @token matches that stored in the current task context, return to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) * top level profile.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) * change_hat only applies to profiles in the current ns, and each profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) * in the ns must make the same transition otherwise change_hat will fail.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) int aa_change_hat(const char *hats[], int count, u64 token, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) const struct cred *cred;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) struct aa_task_ctx *ctx = task_ctx(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) struct aa_label *label, *previous, *new = NULL, *target = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) struct aa_profile *profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) struct aa_perms perms = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) const char *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) /* released below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) cred = get_current_cred();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) label = aa_get_newest_cred_label(cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) previous = aa_get_newest_label(ctx->previous);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) * Detect no new privs being set, and store the label it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163) * occurred under. Ideally this would happen when nnp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) * is set but there isn't a good way to do that yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) * Testing for unconfined must be done before the subset test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) if (task_no_new_privs(current) && !unconfined(label) && !ctx->nnp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) ctx->nnp = aa_get_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) if (unconfined(label)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) info = "unconfined can not change_hat";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) if (count) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) new = change_hat(label, hats, count, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) AA_BUG(!new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) if (IS_ERR(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) error = PTR_ERR(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) /* already audited */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) error = may_change_ptraced_domain(new, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) * no new privs prevents domain transitions that would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) * reduce restrictions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) if (task_no_new_privs(current) && !unconfined(label) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) !aa_label_is_unconfined_subset(new, ctx->nnp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) /* not an apparmor denial per se, so don't log it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) AA_DEBUG("no_new_privs - change_hat denied");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) if (flags & AA_CHANGE_TEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) target = new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) error = aa_set_current_hat(new, token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) if (error == -EACCES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) /* kill task in case of brute force attacks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) goto kill;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) } else if (previous && !(flags & AA_CHANGE_TEST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) * no new privs prevents domain transitions that would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) * reduce restrictions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) if (task_no_new_privs(current) && !unconfined(label) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) !aa_label_is_unconfined_subset(previous, ctx->nnp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) /* not an apparmor denial per se, so don't log it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) AA_DEBUG("no_new_privs - change_hat denied");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) /* Return to saved label. Kill task if restore fails
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) * to avoid brute force attacks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) target = previous;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) error = aa_restore_previous_label(token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) if (error) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) if (error == -EACCES)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) goto kill;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) } /* else ignore @flags && restores when there is no saved profile */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237) aa_put_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) aa_put_label(previous);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) aa_put_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) put_cred(cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) kill:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) info = "failed token match";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) perms.kill = AA_MAY_CHANGEHAT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) aa_audit_file(profile, &perms, OP_CHANGE_HAT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) AA_MAY_CHANGEHAT, NULL, NULL, target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) GLOBAL_ROOT_UID, info, error));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) static int change_profile_perms_wrapper(const char *op, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) struct aa_profile *profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) struct aa_label *target, bool stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) u32 request, struct aa_perms *perms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) const char *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) error = change_profile_perms(profile, target, stack, request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) profile->file.start, perms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) error = aa_audit_file(profile, perms, op, request, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) NULL, target, GLOBAL_ROOT_UID, info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272) error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) * aa_change_profile - perform a one-way profile transition
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) * @fqname: name of profile may include namespace (NOT NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) * @onexec: whether this transition is to take place immediately or at exec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) * @flags: flags affecting change behavior
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) * Change to new profile @name. Unlike with hats, there is no way
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) * to change back. If @name isn't specified the current profile name is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) * used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) * If @onexec then the transition is delayed until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) * the next exec.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) * Returns %0 on success, error otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) int aa_change_profile(const char *fqname, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) struct aa_label *label, *new = NULL, *target = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) struct aa_profile *profile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) struct aa_perms perms = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) const char *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) const char *auditname = fqname; /* retain leading & if stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) bool stack = flags & AA_CHANGE_STACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299) struct aa_task_ctx *ctx = task_ctx(current);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) int error = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) char *op;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) u32 request;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) label = aa_get_current_label();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) * Detect no new privs being set, and store the label it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) * occurred under. Ideally this would happen when nnp
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) * is set but there isn't a good way to do that yet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) * Testing for unconfined must be done before the subset test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313) if (task_no_new_privs(current) && !unconfined(label) && !ctx->nnp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) ctx->nnp = aa_get_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) if (!fqname || !*fqname) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) aa_put_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) AA_DEBUG("no profile name");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) if (flags & AA_CHANGE_ONEXEC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) request = AA_MAY_ONEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) if (stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) op = OP_STACK_ONEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) op = OP_CHANGE_ONEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) request = AA_MAY_CHANGE_PROFILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) if (stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331) op = OP_STACK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) op = OP_CHANGE_PROFILE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) if (*fqname == '&') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) stack = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) /* don't have label_parse() do stacking */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) fqname++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) target = aa_label_parse(label, fqname, GFP_KERNEL, true, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) if (IS_ERR(target)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) struct aa_profile *tprofile;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) info = "label not found";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346) error = PTR_ERR(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) target = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) * TODO: fixme using labels_profile is not right - do profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) * per complain profile
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) if ((flags & AA_CHANGE_TEST) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) !COMPLAIN_MODE(labels_profile(label)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) /* released below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) tprofile = aa_new_null_profile(labels_profile(label), false,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) fqname, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) if (!tprofile) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) info = "failed null profile create";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) target = &tprofile->label;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) goto check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) * self directed transitions only apply to current policy ns
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) * TODO: currently requiring perms for stacking and straight change
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) * stacking doesn't strictly need this. Determine how much
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) * we want to loosen this restriction for stacking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373) * if (!stack) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) error = fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) change_profile_perms_wrapper(op, auditname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) profile, target, stack,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) request, &perms));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) /* auditing done in change_profile_perms_wrapper */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383) /* } */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) check:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) /* check if tracing task is allowed to trace target domain */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) error = may_change_ptraced_domain(target, &info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) if (error && !fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) COMPLAIN_MODE(profile)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) /* TODO: add permission check to allow this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) * if ((flags & AA_CHANGE_ONEXEC) && !current_is_single_threaded()) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394) * info = "not a single threaded task";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) * error = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) * goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) * }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) if (flags & AA_CHANGE_TEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) /* stacking is always a subset, so only check the nonstack case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) if (!stack) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404) new = fn_label_build_in_ns(label, profile, GFP_KERNEL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) aa_get_label(target),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) aa_get_label(&profile->label));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) * no new privs prevents domain transitions that would
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) * reduce restrictions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) if (task_no_new_privs(current) && !unconfined(label) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) !aa_label_is_unconfined_subset(new, ctx->nnp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) /* not an apparmor denial per se, so don't log it */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) AA_DEBUG("no_new_privs - change_hat denied");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415) error = -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) if (!(flags & AA_CHANGE_ONEXEC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) /* only transition profiles in the current ns */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) if (stack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) new = aa_label_merge(label, target, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424) if (IS_ERR_OR_NULL(new)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) info = "failed to build target label";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) error = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) error = PTR_ERR(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) perms.allow = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) goto audit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) error = aa_replace_current_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) if (new) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) aa_put_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) new = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) /* full transition will be built in exec path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) error = aa_set_current_onexec(target, stack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) audit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446) error = fn_for_each_in_ns(label, profile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) aa_audit_file(profile, &perms, op, request, auditname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) NULL, new ? new : target,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449) GLOBAL_ROOT_UID, info, error));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) aa_put_label(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) aa_put_label(target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) aa_put_label(label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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