1898127c3SJohn Johansen /* 2898127c3SJohn Johansen * AppArmor security module 3898127c3SJohn Johansen * 4898127c3SJohn Johansen * This file contains AppArmor policy attachment and domain transitions 5898127c3SJohn Johansen * 6898127c3SJohn Johansen * Copyright (C) 2002-2008 Novell/SUSE 7898127c3SJohn Johansen * Copyright 2009-2010 Canonical Ltd. 8898127c3SJohn Johansen * 9898127c3SJohn Johansen * This program is free software; you can redistribute it and/or 10898127c3SJohn Johansen * modify it under the terms of the GNU General Public License as 11898127c3SJohn Johansen * published by the Free Software Foundation, version 2 of the 12898127c3SJohn Johansen * License. 13898127c3SJohn Johansen */ 14898127c3SJohn Johansen 15898127c3SJohn Johansen #include <linux/errno.h> 16898127c3SJohn Johansen #include <linux/fdtable.h> 17898127c3SJohn Johansen #include <linux/file.h> 18898127c3SJohn Johansen #include <linux/mount.h> 19898127c3SJohn Johansen #include <linux/syscalls.h> 20898127c3SJohn Johansen #include <linux/tracehook.h> 21898127c3SJohn Johansen #include <linux/personality.h> 22898127c3SJohn Johansen 23898127c3SJohn Johansen #include "include/audit.h" 24898127c3SJohn Johansen #include "include/apparmorfs.h" 25898127c3SJohn Johansen #include "include/context.h" 26898127c3SJohn Johansen #include "include/domain.h" 27898127c3SJohn Johansen #include "include/file.h" 28898127c3SJohn Johansen #include "include/ipc.h" 29898127c3SJohn Johansen #include "include/match.h" 30898127c3SJohn Johansen #include "include/path.h" 31898127c3SJohn Johansen #include "include/policy.h" 32cff281f6SJohn Johansen #include "include/policy_ns.h" 33898127c3SJohn Johansen 34898127c3SJohn Johansen /** 35898127c3SJohn Johansen * aa_free_domain_entries - free entries in a domain table 36898127c3SJohn Johansen * @domain: the domain table to free (MAYBE NULL) 37898127c3SJohn Johansen */ 38898127c3SJohn Johansen void aa_free_domain_entries(struct aa_domain *domain) 39898127c3SJohn Johansen { 40898127c3SJohn Johansen int i; 41898127c3SJohn Johansen if (domain) { 42898127c3SJohn Johansen if (!domain->table) 43898127c3SJohn Johansen return; 44898127c3SJohn Johansen 45898127c3SJohn Johansen for (i = 0; i < domain->size; i++) 46898127c3SJohn Johansen kzfree(domain->table[i]); 47898127c3SJohn Johansen kzfree(domain->table); 48898127c3SJohn Johansen domain->table = NULL; 49898127c3SJohn Johansen } 50898127c3SJohn Johansen } 51898127c3SJohn Johansen 52898127c3SJohn Johansen /** 53898127c3SJohn Johansen * may_change_ptraced_domain - check if can change profile on ptraced task 54b2d09ae4SJohn Johansen * @to_label: profile to change to (NOT NULL) 55b2d09ae4SJohn Johansen * @info: message if there is an error 56898127c3SJohn Johansen * 5751775fe7SOleg Nesterov * Check if current is ptraced and if so if the tracing task is allowed 58898127c3SJohn Johansen * to trace the new domain 59898127c3SJohn Johansen * 60898127c3SJohn Johansen * Returns: %0 or error if change not allowed 61898127c3SJohn Johansen */ 62b2d09ae4SJohn Johansen static int may_change_ptraced_domain(struct aa_label *to_label, 63b2d09ae4SJohn Johansen const char **info) 64898127c3SJohn Johansen { 65898127c3SJohn Johansen struct task_struct *tracer; 66637f688dSJohn Johansen struct aa_label *tracerl = NULL; 67898127c3SJohn Johansen int error = 0; 68898127c3SJohn Johansen 69898127c3SJohn Johansen rcu_read_lock(); 7051775fe7SOleg Nesterov tracer = ptrace_parent(current); 713cfcc19eSJohn Johansen if (tracer) 72898127c3SJohn Johansen /* released below */ 73637f688dSJohn Johansen tracerl = aa_get_task_label(tracer); 74898127c3SJohn Johansen 75898127c3SJohn Johansen /* not ptraced */ 76637f688dSJohn Johansen if (!tracer || unconfined(tracerl)) 77898127c3SJohn Johansen goto out; 78898127c3SJohn Johansen 79b2d09ae4SJohn Johansen error = aa_may_ptrace(tracerl, to_label, PTRACE_MODE_ATTACH); 80898127c3SJohn Johansen 81898127c3SJohn Johansen out: 8204fdc099SJohn Johansen rcu_read_unlock(); 83637f688dSJohn Johansen aa_put_label(tracerl); 84898127c3SJohn Johansen 85b2d09ae4SJohn Johansen if (error) 86b2d09ae4SJohn Johansen *info = "ptrace prevents transition"; 87898127c3SJohn Johansen return error; 88898127c3SJohn Johansen } 89898127c3SJohn Johansen 9093c98a48SJohn Johansen /**** TODO: dedup to aa_label_match - needs perm and dfa, merging 9193c98a48SJohn Johansen * specifically this is an exact copy of aa_label_match except 9293c98a48SJohn Johansen * aa_compute_perms is replaced with aa_compute_fperms 9393c98a48SJohn Johansen * and policy.dfa with file.dfa 9493c98a48SJohn Johansen ****/ 9593c98a48SJohn Johansen /* match a profile and its associated ns component if needed 9693c98a48SJohn Johansen * Assumes visibility test has already been done. 9793c98a48SJohn Johansen * If a subns profile is not to be matched should be prescreened with 9893c98a48SJohn Johansen * visibility test. 9993c98a48SJohn Johansen */ 10093c98a48SJohn Johansen static inline unsigned int match_component(struct aa_profile *profile, 10193c98a48SJohn Johansen struct aa_profile *tp, 10293c98a48SJohn Johansen bool stack, unsigned int state) 10393c98a48SJohn Johansen { 10493c98a48SJohn Johansen const char *ns_name; 10593c98a48SJohn Johansen 10693c98a48SJohn Johansen if (stack) 10793c98a48SJohn Johansen state = aa_dfa_match(profile->file.dfa, state, "&"); 10893c98a48SJohn Johansen if (profile->ns == tp->ns) 10993c98a48SJohn Johansen return aa_dfa_match(profile->file.dfa, state, tp->base.hname); 11093c98a48SJohn Johansen 11193c98a48SJohn Johansen /* try matching with namespace name and then profile */ 11293c98a48SJohn Johansen ns_name = aa_ns_name(profile->ns, tp->ns, true); 11393c98a48SJohn Johansen state = aa_dfa_match_len(profile->file.dfa, state, ":", 1); 11493c98a48SJohn Johansen state = aa_dfa_match(profile->file.dfa, state, ns_name); 11593c98a48SJohn Johansen state = aa_dfa_match_len(profile->file.dfa, state, ":", 1); 11693c98a48SJohn Johansen return aa_dfa_match(profile->file.dfa, state, tp->base.hname); 11793c98a48SJohn Johansen } 11893c98a48SJohn Johansen 11993c98a48SJohn Johansen /** 12093c98a48SJohn Johansen * label_compound_match - find perms for full compound label 12193c98a48SJohn Johansen * @profile: profile to find perms for 12293c98a48SJohn Johansen * @label: label to check access permissions for 12393c98a48SJohn Johansen * @stack: whether this is a stacking request 12493c98a48SJohn Johansen * @start: state to start match in 12593c98a48SJohn Johansen * @subns: whether to do permission checks on components in a subns 12693c98a48SJohn Johansen * @request: permissions to request 12793c98a48SJohn Johansen * @perms: perms struct to set 12893c98a48SJohn Johansen * 12993c98a48SJohn Johansen * Returns: 0 on success else ERROR 13093c98a48SJohn Johansen * 13193c98a48SJohn Johansen * For the label A//&B//&C this does the perm match for A//&B//&C 13293c98a48SJohn Johansen * @perms should be preinitialized with allperms OR a previous permission 13393c98a48SJohn Johansen * check to be stacked. 13493c98a48SJohn Johansen */ 13593c98a48SJohn Johansen static int label_compound_match(struct aa_profile *profile, 13693c98a48SJohn Johansen struct aa_label *label, bool stack, 13793c98a48SJohn Johansen unsigned int state, bool subns, u32 request, 13893c98a48SJohn Johansen struct aa_perms *perms) 13993c98a48SJohn Johansen { 14093c98a48SJohn Johansen struct aa_profile *tp; 14193c98a48SJohn Johansen struct label_it i; 14293c98a48SJohn Johansen struct path_cond cond = { }; 14393c98a48SJohn Johansen 14493c98a48SJohn Johansen /* find first subcomponent that is visible */ 14593c98a48SJohn Johansen label_for_each(i, label, tp) { 14693c98a48SJohn Johansen if (!aa_ns_visible(profile->ns, tp->ns, subns)) 14793c98a48SJohn Johansen continue; 14893c98a48SJohn Johansen state = match_component(profile, tp, stack, state); 14993c98a48SJohn Johansen if (!state) 15093c98a48SJohn Johansen goto fail; 15193c98a48SJohn Johansen goto next; 15293c98a48SJohn Johansen } 15393c98a48SJohn Johansen 15493c98a48SJohn Johansen /* no component visible */ 15593c98a48SJohn Johansen *perms = allperms; 15693c98a48SJohn Johansen return 0; 15793c98a48SJohn Johansen 15893c98a48SJohn Johansen next: 15993c98a48SJohn Johansen label_for_each_cont(i, label, tp) { 16093c98a48SJohn Johansen if (!aa_ns_visible(profile->ns, tp->ns, subns)) 16193c98a48SJohn Johansen continue; 16293c98a48SJohn Johansen state = aa_dfa_match(profile->file.dfa, state, "//&"); 16393c98a48SJohn Johansen state = match_component(profile, tp, false, state); 16493c98a48SJohn Johansen if (!state) 16593c98a48SJohn Johansen goto fail; 16693c98a48SJohn Johansen } 16793c98a48SJohn Johansen *perms = aa_compute_fperms(profile->file.dfa, state, &cond); 16893c98a48SJohn Johansen aa_apply_modes_to_perms(profile, perms); 16993c98a48SJohn Johansen if ((perms->allow & request) != request) 17093c98a48SJohn Johansen return -EACCES; 17193c98a48SJohn Johansen 17293c98a48SJohn Johansen return 0; 17393c98a48SJohn Johansen 17493c98a48SJohn Johansen fail: 17593c98a48SJohn Johansen *perms = nullperms; 17693c98a48SJohn Johansen return -EACCES; 17793c98a48SJohn Johansen } 17893c98a48SJohn Johansen 17993c98a48SJohn Johansen /** 18093c98a48SJohn Johansen * label_components_match - find perms for all subcomponents of a label 18193c98a48SJohn Johansen * @profile: profile to find perms for 18293c98a48SJohn Johansen * @label: label to check access permissions for 18393c98a48SJohn Johansen * @stack: whether this is a stacking request 18493c98a48SJohn Johansen * @start: state to start match in 18593c98a48SJohn Johansen * @subns: whether to do permission checks on components in a subns 18693c98a48SJohn Johansen * @request: permissions to request 18793c98a48SJohn Johansen * @perms: an initialized perms struct to add accumulation to 18893c98a48SJohn Johansen * 18993c98a48SJohn Johansen * Returns: 0 on success else ERROR 19093c98a48SJohn Johansen * 19193c98a48SJohn Johansen * For the label A//&B//&C this does the perm match for each of A and B and C 19293c98a48SJohn Johansen * @perms should be preinitialized with allperms OR a previous permission 19393c98a48SJohn Johansen * check to be stacked. 19493c98a48SJohn Johansen */ 19593c98a48SJohn Johansen static int label_components_match(struct aa_profile *profile, 19693c98a48SJohn Johansen struct aa_label *label, bool stack, 19793c98a48SJohn Johansen unsigned int start, bool subns, u32 request, 19893c98a48SJohn Johansen struct aa_perms *perms) 19993c98a48SJohn Johansen { 20093c98a48SJohn Johansen struct aa_profile *tp; 20193c98a48SJohn Johansen struct label_it i; 20293c98a48SJohn Johansen struct aa_perms tmp; 20393c98a48SJohn Johansen struct path_cond cond = { }; 20493c98a48SJohn Johansen unsigned int state = 0; 20593c98a48SJohn Johansen 20693c98a48SJohn Johansen /* find first subcomponent to test */ 20793c98a48SJohn Johansen label_for_each(i, label, tp) { 20893c98a48SJohn Johansen if (!aa_ns_visible(profile->ns, tp->ns, subns)) 20993c98a48SJohn Johansen continue; 21093c98a48SJohn Johansen state = match_component(profile, tp, stack, start); 21193c98a48SJohn Johansen if (!state) 21293c98a48SJohn Johansen goto fail; 21393c98a48SJohn Johansen goto next; 21493c98a48SJohn Johansen } 21593c98a48SJohn Johansen 21693c98a48SJohn Johansen /* no subcomponents visible - no change in perms */ 21793c98a48SJohn Johansen return 0; 21893c98a48SJohn Johansen 21993c98a48SJohn Johansen next: 22093c98a48SJohn Johansen tmp = aa_compute_fperms(profile->file.dfa, state, &cond); 22193c98a48SJohn Johansen aa_apply_modes_to_perms(profile, &tmp); 22293c98a48SJohn Johansen aa_perms_accum(perms, &tmp); 22393c98a48SJohn Johansen label_for_each_cont(i, label, tp) { 22493c98a48SJohn Johansen if (!aa_ns_visible(profile->ns, tp->ns, subns)) 22593c98a48SJohn Johansen continue; 22693c98a48SJohn Johansen state = match_component(profile, tp, stack, start); 22793c98a48SJohn Johansen if (!state) 22893c98a48SJohn Johansen goto fail; 22993c98a48SJohn Johansen tmp = aa_compute_fperms(profile->file.dfa, state, &cond); 23093c98a48SJohn Johansen aa_apply_modes_to_perms(profile, &tmp); 23193c98a48SJohn Johansen aa_perms_accum(perms, &tmp); 23293c98a48SJohn Johansen } 23393c98a48SJohn Johansen 23493c98a48SJohn Johansen if ((perms->allow & request) != request) 23593c98a48SJohn Johansen return -EACCES; 23693c98a48SJohn Johansen 23793c98a48SJohn Johansen return 0; 23893c98a48SJohn Johansen 23993c98a48SJohn Johansen fail: 24093c98a48SJohn Johansen *perms = nullperms; 24193c98a48SJohn Johansen return -EACCES; 24293c98a48SJohn Johansen } 24393c98a48SJohn Johansen 24493c98a48SJohn Johansen /** 24593c98a48SJohn Johansen * label_match - do a multi-component label match 24693c98a48SJohn Johansen * @profile: profile to match against (NOT NULL) 24793c98a48SJohn Johansen * @label: label to match (NOT NULL) 24893c98a48SJohn Johansen * @stack: whether this is a stacking request 24993c98a48SJohn Johansen * @state: state to start in 25093c98a48SJohn Johansen * @subns: whether to match subns components 25193c98a48SJohn Johansen * @request: permission request 25293c98a48SJohn Johansen * @perms: Returns computed perms (NOT NULL) 25393c98a48SJohn Johansen * 25493c98a48SJohn Johansen * Returns: the state the match finished in, may be the none matching state 25593c98a48SJohn Johansen */ 25693c98a48SJohn Johansen static int label_match(struct aa_profile *profile, struct aa_label *label, 25793c98a48SJohn Johansen bool stack, unsigned int state, bool subns, u32 request, 25893c98a48SJohn Johansen struct aa_perms *perms) 25993c98a48SJohn Johansen { 26093c98a48SJohn Johansen int error; 26193c98a48SJohn Johansen 26293c98a48SJohn Johansen *perms = nullperms; 26393c98a48SJohn Johansen error = label_compound_match(profile, label, stack, state, subns, 26493c98a48SJohn Johansen request, perms); 26593c98a48SJohn Johansen if (!error) 26693c98a48SJohn Johansen return error; 26793c98a48SJohn Johansen 26893c98a48SJohn Johansen *perms = allperms; 26993c98a48SJohn Johansen return label_components_match(profile, label, stack, state, subns, 27093c98a48SJohn Johansen request, perms); 27193c98a48SJohn Johansen } 27293c98a48SJohn Johansen 27393c98a48SJohn Johansen /******* end TODO: dedup *****/ 27493c98a48SJohn Johansen 275898127c3SJohn Johansen /** 276898127c3SJohn Johansen * change_profile_perms - find permissions for change_profile 277898127c3SJohn Johansen * @profile: the current profile (NOT NULL) 27893c98a48SJohn Johansen * @target: label to transition to (NOT NULL) 27993c98a48SJohn Johansen * @stack: whether this is a stacking request 280898127c3SJohn Johansen * @request: requested perms 281898127c3SJohn Johansen * @start: state to start matching in 282898127c3SJohn Johansen * 28393c98a48SJohn Johansen * 284898127c3SJohn Johansen * Returns: permission set 28593c98a48SJohn Johansen * 28693c98a48SJohn Johansen * currently only matches full label A//&B//&C or individual components A, B, C 28793c98a48SJohn Johansen * not arbitrary combinations. Eg. A//&B, C 288898127c3SJohn Johansen */ 28993c98a48SJohn Johansen static int change_profile_perms(struct aa_profile *profile, 29093c98a48SJohn Johansen struct aa_label *target, bool stack, 29193c98a48SJohn Johansen u32 request, unsigned int start, 29293c98a48SJohn Johansen struct aa_perms *perms) 29393c98a48SJohn Johansen { 29493c98a48SJohn Johansen if (profile_unconfined(profile)) { 29593c98a48SJohn Johansen perms->allow = AA_MAY_CHANGE_PROFILE | AA_MAY_ONEXEC; 29693c98a48SJohn Johansen perms->audit = perms->quiet = perms->kill = 0; 29793c98a48SJohn Johansen return 0; 29893c98a48SJohn Johansen } 29993c98a48SJohn Johansen 30093c98a48SJohn Johansen /* TODO: add profile in ns screening */ 30193c98a48SJohn Johansen return label_match(profile, target, stack, start, true, request, perms); 30293c98a48SJohn Johansen } 30393c98a48SJohn Johansen 304898127c3SJohn Johansen /** 305898127c3SJohn Johansen * __attach_match_ - find an attachment match 306898127c3SJohn Johansen * @name - to match against (NOT NULL) 307898127c3SJohn Johansen * @head - profile list to walk (NOT NULL) 308844b8292SJohn Johansen * @info - info message if there was an error (NOT NULL) 309898127c3SJohn Johansen * 310898127c3SJohn Johansen * Do a linear search on the profiles in the list. There is a matching 311898127c3SJohn Johansen * preference where an exact match is preferred over a name which uses 312898127c3SJohn Johansen * expressions to match, and matching expressions with the greatest 313898127c3SJohn Johansen * xmatch_len are preferred. 314898127c3SJohn Johansen * 315898127c3SJohn Johansen * Requires: @head not be shared or have appropriate locks held 316898127c3SJohn Johansen * 317898127c3SJohn Johansen * Returns: profile or NULL if no match found 318898127c3SJohn Johansen */ 319898127c3SJohn Johansen static struct aa_profile *__attach_match(const char *name, 320844b8292SJohn Johansen struct list_head *head, 321844b8292SJohn Johansen const char **info) 322898127c3SJohn Johansen { 323898127c3SJohn Johansen int len = 0; 324844b8292SJohn Johansen bool conflict = false; 325898127c3SJohn Johansen struct aa_profile *profile, *candidate = NULL; 326898127c3SJohn Johansen 32701e2b670SJohn Johansen list_for_each_entry_rcu(profile, head, base.list) { 328*06d426d1SJohn Johansen if (profile->label.flags & FLAG_NULL && 329*06d426d1SJohn Johansen &profile->label == ns_unconfined(profile->ns)) 330898127c3SJohn Johansen continue; 331*06d426d1SJohn Johansen 332844b8292SJohn Johansen if (profile->xmatch) { 333844b8292SJohn Johansen if (profile->xmatch_len == len) { 334844b8292SJohn Johansen conflict = true; 335844b8292SJohn Johansen continue; 336844b8292SJohn Johansen } else if (profile->xmatch_len > len) { 337844b8292SJohn Johansen unsigned int state; 338844b8292SJohn Johansen u32 perm; 339844b8292SJohn Johansen 340844b8292SJohn Johansen state = aa_dfa_match(profile->xmatch, 341898127c3SJohn Johansen DFA_START, name); 342844b8292SJohn Johansen perm = dfa_user_allow(profile->xmatch, state); 343898127c3SJohn Johansen /* any accepting state means a valid match. */ 344898127c3SJohn Johansen if (perm & MAY_EXEC) { 345898127c3SJohn Johansen candidate = profile; 346898127c3SJohn Johansen len = profile->xmatch_len; 347844b8292SJohn Johansen conflict = false; 348844b8292SJohn Johansen } 349898127c3SJohn Johansen } 350898127c3SJohn Johansen } else if (!strcmp(profile->base.name, name)) 351898127c3SJohn Johansen /* exact non-re match, no more searching required */ 352898127c3SJohn Johansen return profile; 353898127c3SJohn Johansen } 354898127c3SJohn Johansen 355844b8292SJohn Johansen if (conflict) { 356844b8292SJohn Johansen *info = "conflicting profile attachments"; 357844b8292SJohn Johansen return NULL; 358844b8292SJohn Johansen } 359844b8292SJohn Johansen 360898127c3SJohn Johansen return candidate; 361898127c3SJohn Johansen } 362898127c3SJohn Johansen 363898127c3SJohn Johansen /** 364898127c3SJohn Johansen * find_attach - do attachment search for unconfined processes 365898127c3SJohn Johansen * @ns: the current namespace (NOT NULL) 366898127c3SJohn Johansen * @list: list to search (NOT NULL) 367898127c3SJohn Johansen * @name: the executable name to match against (NOT NULL) 368844b8292SJohn Johansen * @info: info message if there was an error 369898127c3SJohn Johansen * 37093c98a48SJohn Johansen * Returns: label or NULL if no match found 371898127c3SJohn Johansen */ 37293c98a48SJohn Johansen static struct aa_label *find_attach(struct aa_ns *ns, struct list_head *list, 373844b8292SJohn Johansen const char *name, const char **info) 374898127c3SJohn Johansen { 375898127c3SJohn Johansen struct aa_profile *profile; 376898127c3SJohn Johansen 37701e2b670SJohn Johansen rcu_read_lock(); 378844b8292SJohn Johansen profile = aa_get_profile(__attach_match(name, list, info)); 37901e2b670SJohn Johansen rcu_read_unlock(); 380898127c3SJohn Johansen 38193c98a48SJohn Johansen return profile ? &profile->label : NULL; 382898127c3SJohn Johansen } 383898127c3SJohn Johansen 384898127c3SJohn Johansen static const char *next_name(int xtype, const char *name) 385898127c3SJohn Johansen { 386898127c3SJohn Johansen return NULL; 387898127c3SJohn Johansen } 388898127c3SJohn Johansen 389898127c3SJohn Johansen /** 390898127c3SJohn Johansen * x_table_lookup - lookup an x transition name via transition table 391898127c3SJohn Johansen * @profile: current profile (NOT NULL) 392898127c3SJohn Johansen * @xindex: index into x transition table 39393c98a48SJohn Johansen * @name: returns: name tested to find label (NOT NULL) 394898127c3SJohn Johansen * 39593c98a48SJohn Johansen * Returns: refcounted label, or NULL on failure (MAYBE NULL) 396898127c3SJohn Johansen */ 3972ea3ffb7SJohn Johansen struct aa_label *x_table_lookup(struct aa_profile *profile, u32 xindex, 39893c98a48SJohn Johansen const char **name) 399898127c3SJohn Johansen { 40093c98a48SJohn Johansen struct aa_label *label = NULL; 401898127c3SJohn Johansen u32 xtype = xindex & AA_X_TYPE_MASK; 402898127c3SJohn Johansen int index = xindex & AA_X_INDEX_MASK; 40393c98a48SJohn Johansen 40493c98a48SJohn Johansen AA_BUG(!name); 405898127c3SJohn Johansen 406898127c3SJohn Johansen /* index is guaranteed to be in range, validated at load time */ 40793c98a48SJohn Johansen /* TODO: move lookup parsing to unpack time so this is a straight 40893c98a48SJohn Johansen * index into the resultant label 40993c98a48SJohn Johansen */ 41093c98a48SJohn Johansen for (*name = profile->file.trans.table[index]; !label && *name; 41193c98a48SJohn Johansen *name = next_name(xtype, *name)) { 412898127c3SJohn Johansen if (xindex & AA_X_CHILD) { 41393c98a48SJohn Johansen struct aa_profile *new_profile; 414898127c3SJohn Johansen /* release by caller */ 41593c98a48SJohn Johansen new_profile = aa_find_child(profile, *name); 41693c98a48SJohn Johansen if (new_profile) 41793c98a48SJohn Johansen label = &new_profile->label; 418898127c3SJohn Johansen continue; 419898127c3SJohn Johansen } 42093c98a48SJohn Johansen label = aa_label_parse(&profile->label, *name, GFP_ATOMIC, 42193c98a48SJohn Johansen true, false); 42293c98a48SJohn Johansen if (IS_ERR(label)) 42393c98a48SJohn Johansen label = NULL; 424898127c3SJohn Johansen } 425898127c3SJohn Johansen 426898127c3SJohn Johansen /* released by caller */ 427898127c3SJohn Johansen 42893c98a48SJohn Johansen return label; 429898127c3SJohn Johansen } 430898127c3SJohn Johansen 431898127c3SJohn Johansen /** 43293c98a48SJohn Johansen * x_to_label - get target label for a given xindex 433898127c3SJohn Johansen * @profile: current profile (NOT NULL) 434898127c3SJohn Johansen * @name: name to lookup (NOT NULL) 435898127c3SJohn Johansen * @xindex: index into x transition table 43693c98a48SJohn Johansen * @lookupname: returns: name used in lookup if one was specified (NOT NULL) 437898127c3SJohn Johansen * 43893c98a48SJohn Johansen * find label for a transition index 439898127c3SJohn Johansen * 44093c98a48SJohn Johansen * Returns: refcounted label or NULL if not found available 441898127c3SJohn Johansen */ 44293c98a48SJohn Johansen static struct aa_label *x_to_label(struct aa_profile *profile, 44393c98a48SJohn Johansen const char *name, u32 xindex, 44493c98a48SJohn Johansen const char **lookupname, 44593c98a48SJohn Johansen const char **info) 446898127c3SJohn Johansen { 44793c98a48SJohn Johansen struct aa_label *new = NULL; 44898849dffSJohn Johansen struct aa_ns *ns = profile->ns; 449898127c3SJohn Johansen u32 xtype = xindex & AA_X_TYPE_MASK; 45093c98a48SJohn Johansen const char *stack = NULL; 451898127c3SJohn Johansen 452898127c3SJohn Johansen switch (xtype) { 453898127c3SJohn Johansen case AA_X_NONE: 454898127c3SJohn Johansen /* fail exec unless ix || ux fallback - handled by caller */ 45593c98a48SJohn Johansen *lookupname = NULL; 45693c98a48SJohn Johansen break; 45793c98a48SJohn Johansen case AA_X_TABLE: 45893c98a48SJohn Johansen /* TODO: fix when perm mapping done at unload */ 45993c98a48SJohn Johansen stack = profile->file.trans.table[xindex & AA_X_INDEX_MASK]; 46093c98a48SJohn Johansen if (*stack != '&') { 46193c98a48SJohn Johansen /* released by caller */ 46293c98a48SJohn Johansen new = x_table_lookup(profile, xindex, lookupname); 46393c98a48SJohn Johansen stack = NULL; 46493c98a48SJohn Johansen break; 46593c98a48SJohn Johansen } 46693c98a48SJohn Johansen /* fall through to X_NAME */ 467898127c3SJohn Johansen case AA_X_NAME: 468898127c3SJohn Johansen if (xindex & AA_X_CHILD) 469898127c3SJohn Johansen /* released by caller */ 47093c98a48SJohn Johansen new = find_attach(ns, &profile->base.profiles, 471844b8292SJohn Johansen name, info); 472898127c3SJohn Johansen else 473898127c3SJohn Johansen /* released by caller */ 47493c98a48SJohn Johansen new = find_attach(ns, &ns->base.profiles, 475844b8292SJohn Johansen name, info); 47693c98a48SJohn Johansen *lookupname = name; 477898127c3SJohn Johansen break; 478898127c3SJohn Johansen } 479898127c3SJohn Johansen 48093c98a48SJohn Johansen if (!new) { 48193c98a48SJohn Johansen if (xindex & AA_X_INHERIT) { 48293c98a48SJohn Johansen /* (p|c|n)ix - don't change profile but do 48393c98a48SJohn Johansen * use the newest version 48493c98a48SJohn Johansen */ 48593c98a48SJohn Johansen *info = "ix fallback"; 48693c98a48SJohn Johansen /* no profile && no error */ 48793c98a48SJohn Johansen new = aa_get_newest_label(&profile->label); 48893c98a48SJohn Johansen } else if (xindex & AA_X_UNCONFINED) { 48993c98a48SJohn Johansen new = aa_get_newest_label(ns_unconfined(profile->ns)); 49093c98a48SJohn Johansen *info = "ux fallback"; 49193c98a48SJohn Johansen } 49293c98a48SJohn Johansen } 49393c98a48SJohn Johansen 49493c98a48SJohn Johansen if (new && stack) { 49593c98a48SJohn Johansen /* base the stack on post domain transition */ 49693c98a48SJohn Johansen struct aa_label *base = new; 49793c98a48SJohn Johansen 49893c98a48SJohn Johansen new = aa_label_parse(base, stack, GFP_ATOMIC, true, false); 49993c98a48SJohn Johansen if (IS_ERR(new)) 50093c98a48SJohn Johansen new = NULL; 50193c98a48SJohn Johansen aa_put_label(base); 50293c98a48SJohn Johansen } 50393c98a48SJohn Johansen 504898127c3SJohn Johansen /* released by caller */ 50593c98a48SJohn Johansen return new; 50693c98a48SJohn Johansen } 50793c98a48SJohn Johansen 50893c98a48SJohn Johansen static struct aa_label *profile_transition(struct aa_profile *profile, 50993c98a48SJohn Johansen const struct linux_binprm *bprm, 51093c98a48SJohn Johansen char *buffer, struct path_cond *cond, 51193c98a48SJohn Johansen bool *secure_exec) 51293c98a48SJohn Johansen { 51393c98a48SJohn Johansen struct aa_label *new = NULL; 51493c98a48SJohn Johansen const char *info = NULL, *name = NULL, *target = NULL; 51593c98a48SJohn Johansen unsigned int state = profile->file.start; 51693c98a48SJohn Johansen struct aa_perms perms = {}; 51793c98a48SJohn Johansen bool nonewprivs = false; 51893c98a48SJohn Johansen int error = 0; 51993c98a48SJohn Johansen 52093c98a48SJohn Johansen AA_BUG(!profile); 52193c98a48SJohn Johansen AA_BUG(!bprm); 52293c98a48SJohn Johansen AA_BUG(!buffer); 52393c98a48SJohn Johansen 52493c98a48SJohn Johansen error = aa_path_name(&bprm->file->f_path, profile->path_flags, buffer, 52593c98a48SJohn Johansen &name, &info, profile->disconnected); 52693c98a48SJohn Johansen if (error) { 52793c98a48SJohn Johansen if (profile_unconfined(profile) || 52893c98a48SJohn Johansen (profile->label.flags & FLAG_IX_ON_NAME_ERROR)) { 52993c98a48SJohn Johansen AA_DEBUG("name lookup ix on error"); 53093c98a48SJohn Johansen error = 0; 53193c98a48SJohn Johansen new = aa_get_newest_label(&profile->label); 53293c98a48SJohn Johansen } 53393c98a48SJohn Johansen name = bprm->filename; 53493c98a48SJohn Johansen goto audit; 53593c98a48SJohn Johansen } 53693c98a48SJohn Johansen 53793c98a48SJohn Johansen if (profile_unconfined(profile)) { 53893c98a48SJohn Johansen new = find_attach(profile->ns, &profile->ns->base.profiles, 539844b8292SJohn Johansen name, &info); 54093c98a48SJohn Johansen if (new) { 54193c98a48SJohn Johansen AA_DEBUG("unconfined attached to new label"); 54293c98a48SJohn Johansen return new; 54393c98a48SJohn Johansen } 54493c98a48SJohn Johansen AA_DEBUG("unconfined exec no attachment"); 54593c98a48SJohn Johansen return aa_get_newest_label(&profile->label); 54693c98a48SJohn Johansen } 54793c98a48SJohn Johansen 54893c98a48SJohn Johansen /* find exec permissions for name */ 54993c98a48SJohn Johansen state = aa_str_perms(profile->file.dfa, state, name, cond, &perms); 55093c98a48SJohn Johansen if (perms.allow & MAY_EXEC) { 55193c98a48SJohn Johansen /* exec permission determine how to transition */ 55293c98a48SJohn Johansen new = x_to_label(profile, name, perms.xindex, &target, &info); 55393c98a48SJohn Johansen if (new && new->proxy == profile->label.proxy && info) { 55493c98a48SJohn Johansen /* hack ix fallback - improve how this is detected */ 55593c98a48SJohn Johansen goto audit; 55693c98a48SJohn Johansen } else if (!new) { 55793c98a48SJohn Johansen error = -EACCES; 55893c98a48SJohn Johansen info = "profile transition not found"; 55993c98a48SJohn Johansen /* remove MAY_EXEC to audit as failure */ 56093c98a48SJohn Johansen perms.allow &= ~MAY_EXEC; 56193c98a48SJohn Johansen } 56293c98a48SJohn Johansen } else if (COMPLAIN_MODE(profile)) { 56393c98a48SJohn Johansen /* no exec permission - learning mode */ 56493c98a48SJohn Johansen struct aa_profile *new_profile = aa_new_null_profile(profile, 56593c98a48SJohn Johansen false, name, 56693c98a48SJohn Johansen GFP_ATOMIC); 56793c98a48SJohn Johansen if (!new_profile) { 56893c98a48SJohn Johansen error = -ENOMEM; 56993c98a48SJohn Johansen info = "could not create null profile"; 57093c98a48SJohn Johansen } else { 57193c98a48SJohn Johansen error = -EACCES; 57293c98a48SJohn Johansen new = &new_profile->label; 57393c98a48SJohn Johansen } 57493c98a48SJohn Johansen perms.xindex |= AA_X_UNSAFE; 57593c98a48SJohn Johansen } else 57693c98a48SJohn Johansen /* fail exec */ 57793c98a48SJohn Johansen error = -EACCES; 57893c98a48SJohn Johansen 57993c98a48SJohn Johansen if (!new) 58093c98a48SJohn Johansen goto audit; 58193c98a48SJohn Johansen 58293c98a48SJohn Johansen /* Policy has specified a domain transitions. if no_new_privs and 58393c98a48SJohn Johansen * confined and not transitioning to the current domain fail. 58493c98a48SJohn Johansen * 58593c98a48SJohn Johansen * NOTE: Domain transitions from unconfined and to stritly stacked 58693c98a48SJohn Johansen * subsets are allowed even when no_new_privs is set because this 58793c98a48SJohn Johansen * aways results in a further reduction of permissions. 58893c98a48SJohn Johansen */ 58993c98a48SJohn Johansen if ((bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) && 59093c98a48SJohn Johansen !profile_unconfined(profile) && 59193c98a48SJohn Johansen !aa_label_is_subset(new, &profile->label)) { 59293c98a48SJohn Johansen error = -EPERM; 59393c98a48SJohn Johansen info = "no new privs"; 59493c98a48SJohn Johansen nonewprivs = true; 59593c98a48SJohn Johansen perms.allow &= ~MAY_EXEC; 59693c98a48SJohn Johansen goto audit; 59793c98a48SJohn Johansen } 59893c98a48SJohn Johansen 59993c98a48SJohn Johansen if (!(perms.xindex & AA_X_UNSAFE)) { 60093c98a48SJohn Johansen if (DEBUG_ON) { 60193c98a48SJohn Johansen dbg_printk("apparmor: scrubbing environment variables" 60293c98a48SJohn Johansen " for %s profile=", name); 60393c98a48SJohn Johansen aa_label_printk(new, GFP_ATOMIC); 60493c98a48SJohn Johansen dbg_printk("\n"); 60593c98a48SJohn Johansen } 60693c98a48SJohn Johansen *secure_exec = true; 60793c98a48SJohn Johansen } 60893c98a48SJohn Johansen 60993c98a48SJohn Johansen audit: 61093c98a48SJohn Johansen aa_audit_file(profile, &perms, OP_EXEC, MAY_EXEC, name, target, new, 61193c98a48SJohn Johansen cond->uid, info, error); 61293c98a48SJohn Johansen if (!new || nonewprivs) { 61393c98a48SJohn Johansen aa_put_label(new); 61493c98a48SJohn Johansen return ERR_PTR(error); 61593c98a48SJohn Johansen } 61693c98a48SJohn Johansen 61793c98a48SJohn Johansen return new; 61893c98a48SJohn Johansen } 61993c98a48SJohn Johansen 62093c98a48SJohn Johansen static int profile_onexec(struct aa_profile *profile, struct aa_label *onexec, 62193c98a48SJohn Johansen bool stack, const struct linux_binprm *bprm, 62293c98a48SJohn Johansen char *buffer, struct path_cond *cond, 62393c98a48SJohn Johansen bool *secure_exec) 62493c98a48SJohn Johansen { 62593c98a48SJohn Johansen unsigned int state = profile->file.start; 62693c98a48SJohn Johansen struct aa_perms perms = {}; 62793c98a48SJohn Johansen const char *xname = NULL, *info = "change_profile onexec"; 62893c98a48SJohn Johansen int error = -EACCES; 62993c98a48SJohn Johansen 63093c98a48SJohn Johansen AA_BUG(!profile); 63193c98a48SJohn Johansen AA_BUG(!onexec); 63293c98a48SJohn Johansen AA_BUG(!bprm); 63393c98a48SJohn Johansen AA_BUG(!buffer); 63493c98a48SJohn Johansen 63593c98a48SJohn Johansen if (profile_unconfined(profile)) { 63693c98a48SJohn Johansen /* change_profile on exec already granted */ 63793c98a48SJohn Johansen /* 63893c98a48SJohn Johansen * NOTE: Domain transitions from unconfined are allowed 63993c98a48SJohn Johansen * even when no_new_privs is set because this aways results 64093c98a48SJohn Johansen * in a further reduction of permissions. 64193c98a48SJohn Johansen */ 64293c98a48SJohn Johansen return 0; 64393c98a48SJohn Johansen } 64493c98a48SJohn Johansen 64593c98a48SJohn Johansen error = aa_path_name(&bprm->file->f_path, profile->path_flags, buffer, 64693c98a48SJohn Johansen &xname, &info, profile->disconnected); 64793c98a48SJohn Johansen if (error) { 64893c98a48SJohn Johansen if (profile_unconfined(profile) || 64993c98a48SJohn Johansen (profile->label.flags & FLAG_IX_ON_NAME_ERROR)) { 65093c98a48SJohn Johansen AA_DEBUG("name lookup ix on error"); 65193c98a48SJohn Johansen error = 0; 65293c98a48SJohn Johansen } 65393c98a48SJohn Johansen xname = bprm->filename; 65493c98a48SJohn Johansen goto audit; 65593c98a48SJohn Johansen } 65693c98a48SJohn Johansen 65793c98a48SJohn Johansen /* find exec permissions for name */ 65893c98a48SJohn Johansen state = aa_str_perms(profile->file.dfa, state, xname, cond, &perms); 65993c98a48SJohn Johansen if (!(perms.allow & AA_MAY_ONEXEC)) { 66093c98a48SJohn Johansen info = "no change_onexec valid for executable"; 66193c98a48SJohn Johansen goto audit; 66293c98a48SJohn Johansen } 66393c98a48SJohn Johansen /* test if this exec can be paired with change_profile onexec. 66493c98a48SJohn Johansen * onexec permission is linked to exec with a standard pairing 66593c98a48SJohn Johansen * exec\0change_profile 66693c98a48SJohn Johansen */ 66793c98a48SJohn Johansen state = aa_dfa_null_transition(profile->file.dfa, state); 66893c98a48SJohn Johansen error = change_profile_perms(profile, onexec, stack, AA_MAY_ONEXEC, 66993c98a48SJohn Johansen state, &perms); 67093c98a48SJohn Johansen if (error) { 67193c98a48SJohn Johansen perms.allow &= ~AA_MAY_ONEXEC; 67293c98a48SJohn Johansen goto audit; 67393c98a48SJohn Johansen } 67493c98a48SJohn Johansen /* Policy has specified a domain transitions. if no_new_privs and 67593c98a48SJohn Johansen * confined and not transitioning to the current domain fail. 67693c98a48SJohn Johansen * 67793c98a48SJohn Johansen * NOTE: Domain transitions from unconfined and to stritly stacked 67893c98a48SJohn Johansen * subsets are allowed even when no_new_privs is set because this 67993c98a48SJohn Johansen * aways results in a further reduction of permissions. 68093c98a48SJohn Johansen */ 68193c98a48SJohn Johansen if ((bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS) && 68293c98a48SJohn Johansen !profile_unconfined(profile) && 68393c98a48SJohn Johansen !aa_label_is_subset(onexec, &profile->label)) { 68493c98a48SJohn Johansen error = -EPERM; 68593c98a48SJohn Johansen info = "no new privs"; 68693c98a48SJohn Johansen perms.allow &= ~AA_MAY_ONEXEC; 68793c98a48SJohn Johansen goto audit; 68893c98a48SJohn Johansen } 68993c98a48SJohn Johansen 69093c98a48SJohn Johansen if (!(perms.xindex & AA_X_UNSAFE)) { 69193c98a48SJohn Johansen if (DEBUG_ON) { 69293c98a48SJohn Johansen dbg_printk("apparmor: scrubbing environment " 69393c98a48SJohn Johansen "variables for %s label=", xname); 69493c98a48SJohn Johansen aa_label_printk(onexec, GFP_ATOMIC); 69593c98a48SJohn Johansen dbg_printk("\n"); 69693c98a48SJohn Johansen } 69793c98a48SJohn Johansen *secure_exec = true; 69893c98a48SJohn Johansen } 69993c98a48SJohn Johansen 70093c98a48SJohn Johansen audit: 70193c98a48SJohn Johansen return aa_audit_file(profile, &perms, OP_EXEC, AA_MAY_ONEXEC, xname, 70293c98a48SJohn Johansen NULL, onexec, cond->uid, info, error); 70393c98a48SJohn Johansen } 70493c98a48SJohn Johansen 70593c98a48SJohn Johansen /* ensure none ns domain transitions are correctly applied with onexec */ 70693c98a48SJohn Johansen 70793c98a48SJohn Johansen static struct aa_label *handle_onexec(struct aa_label *label, 70893c98a48SJohn Johansen struct aa_label *onexec, bool stack, 70993c98a48SJohn Johansen const struct linux_binprm *bprm, 71093c98a48SJohn Johansen char *buffer, struct path_cond *cond, 71193c98a48SJohn Johansen bool *unsafe) 71293c98a48SJohn Johansen { 71393c98a48SJohn Johansen struct aa_profile *profile; 71493c98a48SJohn Johansen struct aa_label *new; 71593c98a48SJohn Johansen int error; 71693c98a48SJohn Johansen 71793c98a48SJohn Johansen AA_BUG(!label); 71893c98a48SJohn Johansen AA_BUG(!onexec); 71993c98a48SJohn Johansen AA_BUG(!bprm); 72093c98a48SJohn Johansen AA_BUG(!buffer); 72193c98a48SJohn Johansen 72293c98a48SJohn Johansen if (!stack) { 72393c98a48SJohn Johansen error = fn_for_each_in_ns(label, profile, 72493c98a48SJohn Johansen profile_onexec(profile, onexec, stack, 72593c98a48SJohn Johansen bprm, buffer, cond, unsafe)); 72693c98a48SJohn Johansen if (error) 72793c98a48SJohn Johansen return ERR_PTR(error); 72893c98a48SJohn Johansen new = fn_label_build_in_ns(label, profile, GFP_ATOMIC, 72993c98a48SJohn Johansen aa_get_newest_label(onexec), 73093c98a48SJohn Johansen profile_transition(profile, bprm, buffer, 73193c98a48SJohn Johansen cond, unsafe)); 73293c98a48SJohn Johansen 73393c98a48SJohn Johansen } else { 73493c98a48SJohn Johansen /* TODO: determine how much we want to losen this */ 73593c98a48SJohn Johansen error = fn_for_each_in_ns(label, profile, 73693c98a48SJohn Johansen profile_onexec(profile, onexec, stack, bprm, 73793c98a48SJohn Johansen buffer, cond, unsafe)); 73893c98a48SJohn Johansen if (error) 73993c98a48SJohn Johansen return ERR_PTR(error); 74093c98a48SJohn Johansen new = fn_label_build_in_ns(label, profile, GFP_ATOMIC, 74193c98a48SJohn Johansen aa_label_merge(&profile->label, onexec, 74293c98a48SJohn Johansen GFP_ATOMIC), 74393c98a48SJohn Johansen profile_transition(profile, bprm, buffer, 74493c98a48SJohn Johansen cond, unsafe)); 74593c98a48SJohn Johansen } 74693c98a48SJohn Johansen 74793c98a48SJohn Johansen if (new) 74893c98a48SJohn Johansen return new; 74993c98a48SJohn Johansen 75093c98a48SJohn Johansen /* TODO: get rid of GLOBAL_ROOT_UID */ 75193c98a48SJohn Johansen error = fn_for_each_in_ns(label, profile, 75293c98a48SJohn Johansen aa_audit_file(profile, &nullperms, OP_CHANGE_ONEXEC, 75393c98a48SJohn Johansen AA_MAY_ONEXEC, bprm->filename, NULL, 75493c98a48SJohn Johansen onexec, GLOBAL_ROOT_UID, 75593c98a48SJohn Johansen "failed to build target label", -ENOMEM)); 75693c98a48SJohn Johansen return ERR_PTR(error); 757898127c3SJohn Johansen } 758898127c3SJohn Johansen 759898127c3SJohn Johansen /** 760898127c3SJohn Johansen * apparmor_bprm_set_creds - set the new creds on the bprm struct 761898127c3SJohn Johansen * @bprm: binprm for the exec (NOT NULL) 762898127c3SJohn Johansen * 763898127c3SJohn Johansen * Returns: %0 or error on failure 76493c98a48SJohn Johansen * 76593c98a48SJohn Johansen * TODO: once the other paths are done see if we can't refactor into a fn 766898127c3SJohn Johansen */ 767898127c3SJohn Johansen int apparmor_bprm_set_creds(struct linux_binprm *bprm) 768898127c3SJohn Johansen { 76955a26ebfSJohn Johansen struct aa_task_ctx *ctx; 77093c98a48SJohn Johansen struct aa_label *label, *new = NULL; 77193c98a48SJohn Johansen struct aa_profile *profile; 772898127c3SJohn Johansen char *buffer = NULL; 77393c98a48SJohn Johansen const char *info = NULL; 77493c98a48SJohn Johansen int error = 0; 77593c98a48SJohn Johansen bool unsafe = false; 776898127c3SJohn Johansen struct path_cond cond = { 777496ad9aaSAl Viro file_inode(bprm->file)->i_uid, 778496ad9aaSAl Viro file_inode(bprm->file)->i_mode 779898127c3SJohn Johansen }; 780898127c3SJohn Johansen 781ddb4a144SKees Cook if (bprm->called_set_creds) 782898127c3SJohn Johansen return 0; 783898127c3SJohn Johansen 78455a26ebfSJohn Johansen ctx = cred_ctx(bprm->cred); 78555a26ebfSJohn Johansen AA_BUG(!ctx); 786898127c3SJohn Johansen 787637f688dSJohn Johansen label = aa_get_newest_label(ctx->label); 7884227c333SJohn Johansen 7894227c333SJohn Johansen /* buffer freed below, name is pointer into buffer */ 7904227c333SJohn Johansen get_buffers(buffer); 79193c98a48SJohn Johansen /* Test for onexec first as onexec override other x transitions. */ 79255a26ebfSJohn Johansen if (ctx->onexec) 79393c98a48SJohn Johansen new = handle_onexec(label, ctx->onexec, ctx->token, 79493c98a48SJohn Johansen bprm, buffer, &cond, &unsafe); 795898127c3SJohn Johansen else 79693c98a48SJohn Johansen new = fn_label_build(label, profile, GFP_ATOMIC, 79793c98a48SJohn Johansen profile_transition(profile, bprm, buffer, 79893c98a48SJohn Johansen &cond, &unsafe)); 799898127c3SJohn Johansen 80093c98a48SJohn Johansen AA_BUG(!new); 80193c98a48SJohn Johansen if (IS_ERR(new)) { 80293c98a48SJohn Johansen error = PTR_ERR(new); 80393c98a48SJohn Johansen goto done; 80493c98a48SJohn Johansen } else if (!new) { 805898127c3SJohn Johansen error = -ENOMEM; 80693c98a48SJohn Johansen goto done; 807c29bceb3SJohn Johansen } 808c29bceb3SJohn Johansen 80993c98a48SJohn Johansen /* TODO: Add ns level no_new_privs subset test */ 810898127c3SJohn Johansen 811898127c3SJohn Johansen if (bprm->unsafe & LSM_UNSAFE_SHARE) { 812898127c3SJohn Johansen /* FIXME: currently don't mediate shared state */ 813898127c3SJohn Johansen ; 814898127c3SJohn Johansen } 815898127c3SJohn Johansen 81693c98a48SJohn Johansen if (bprm->unsafe & (LSM_UNSAFE_PTRACE)) { 81793c98a48SJohn Johansen /* TODO: test needs to be profile of label to new */ 81893c98a48SJohn Johansen error = may_change_ptraced_domain(new, &info); 819f7da2de0SJohn Johansen if (error) 820898127c3SJohn Johansen goto audit; 821898127c3SJohn Johansen } 822898127c3SJohn Johansen 82393c98a48SJohn Johansen if (unsafe) { 82493c98a48SJohn Johansen if (DEBUG_ON) { 82593c98a48SJohn Johansen dbg_printk("scrubbing environment variables for %s " 82693c98a48SJohn Johansen "label=", bprm->filename); 82793c98a48SJohn Johansen aa_label_printk(new, GFP_ATOMIC); 82893c98a48SJohn Johansen dbg_printk("\n"); 82993c98a48SJohn Johansen } 830993b3ab0SKees Cook bprm->secureexec = 1; 831898127c3SJohn Johansen } 83293c98a48SJohn Johansen 83393c98a48SJohn Johansen if (label->proxy != new->proxy) { 83493c98a48SJohn Johansen /* when transitioning clear unsafe personality bits */ 83593c98a48SJohn Johansen if (DEBUG_ON) { 83693c98a48SJohn Johansen dbg_printk("apparmor: clearing unsafe personality " 83793c98a48SJohn Johansen "bits. %s label=", bprm->filename); 83893c98a48SJohn Johansen aa_label_printk(new, GFP_ATOMIC); 83993c98a48SJohn Johansen dbg_printk("\n"); 84093c98a48SJohn Johansen } 841898127c3SJohn Johansen bprm->per_clear |= PER_CLEAR_ON_SETID; 84293c98a48SJohn Johansen } 843637f688dSJohn Johansen aa_put_label(ctx->label); 84493c98a48SJohn Johansen /* transfer reference, released when ctx is freed */ 84593c98a48SJohn Johansen ctx->label = new; 846898127c3SJohn Johansen 84793c98a48SJohn Johansen done: 84893c98a48SJohn Johansen /* clear out temporary/transitional state from the context */ 84955a26ebfSJohn Johansen aa_clear_task_ctx_trans(ctx); 850898127c3SJohn Johansen 851637f688dSJohn Johansen aa_put_label(label); 8524227c333SJohn Johansen put_buffers(buffer); 853898127c3SJohn Johansen 854898127c3SJohn Johansen return error; 85593c98a48SJohn Johansen 85693c98a48SJohn Johansen audit: 85793c98a48SJohn Johansen error = fn_for_each(label, profile, 85893c98a48SJohn Johansen aa_audit_file(profile, &nullperms, OP_EXEC, MAY_EXEC, 85993c98a48SJohn Johansen bprm->filename, NULL, new, 86093c98a48SJohn Johansen file_inode(bprm->file)->i_uid, info, 86193c98a48SJohn Johansen error)); 86293c98a48SJohn Johansen aa_put_label(new); 86393c98a48SJohn Johansen goto done; 864898127c3SJohn Johansen } 865898127c3SJohn Johansen 866898127c3SJohn Johansen /* 867898127c3SJohn Johansen * Functions for self directed profile change 868898127c3SJohn Johansen */ 869898127c3SJohn Johansen 87089dbf196SJohn Johansen 87189dbf196SJohn Johansen /* helper fn for change_hat 872898127c3SJohn Johansen * 87389dbf196SJohn Johansen * Returns: label for hat transition OR ERR_PTR. Does NOT return NULL 874898127c3SJohn Johansen */ 87589dbf196SJohn Johansen static struct aa_label *build_change_hat(struct aa_profile *profile, 87689dbf196SJohn Johansen const char *name, bool sibling) 877898127c3SJohn Johansen { 87889dbf196SJohn Johansen struct aa_profile *root, *hat = NULL; 87989dbf196SJohn Johansen const char *info = NULL; 88089dbf196SJohn Johansen int error = 0; 88189dbf196SJohn Johansen 88289dbf196SJohn Johansen if (sibling && PROFILE_IS_HAT(profile)) { 88389dbf196SJohn Johansen root = aa_get_profile_rcu(&profile->parent); 88489dbf196SJohn Johansen } else if (!sibling && !PROFILE_IS_HAT(profile)) { 88589dbf196SJohn Johansen root = aa_get_profile(profile); 88689dbf196SJohn Johansen } else { 88789dbf196SJohn Johansen info = "conflicting target types"; 88889dbf196SJohn Johansen error = -EPERM; 88989dbf196SJohn Johansen goto audit; 89089dbf196SJohn Johansen } 89189dbf196SJohn Johansen 89289dbf196SJohn Johansen hat = aa_find_child(root, name); 89389dbf196SJohn Johansen if (!hat) { 89489dbf196SJohn Johansen error = -ENOENT; 89589dbf196SJohn Johansen if (COMPLAIN_MODE(profile)) { 89689dbf196SJohn Johansen hat = aa_new_null_profile(profile, true, name, 89789dbf196SJohn Johansen GFP_KERNEL); 89889dbf196SJohn Johansen if (!hat) { 89989dbf196SJohn Johansen info = "failed null profile create"; 90089dbf196SJohn Johansen error = -ENOMEM; 90189dbf196SJohn Johansen } 90289dbf196SJohn Johansen } 90389dbf196SJohn Johansen } 90489dbf196SJohn Johansen aa_put_profile(root); 90589dbf196SJohn Johansen 90689dbf196SJohn Johansen audit: 90789dbf196SJohn Johansen aa_audit_file(profile, &nullperms, OP_CHANGE_HAT, AA_MAY_CHANGEHAT, 90889dbf196SJohn Johansen name, hat ? hat->base.hname : NULL, 90989dbf196SJohn Johansen hat ? &hat->label : NULL, GLOBAL_ROOT_UID, NULL, 91089dbf196SJohn Johansen error); 91189dbf196SJohn Johansen if (!hat || (error && error != -ENOENT)) 91289dbf196SJohn Johansen return ERR_PTR(error); 91389dbf196SJohn Johansen /* if hat && error - complain mode, already audited and we adjust for 91489dbf196SJohn Johansen * complain mode allow by returning hat->label 91589dbf196SJohn Johansen */ 91689dbf196SJohn Johansen return &hat->label; 91789dbf196SJohn Johansen } 91889dbf196SJohn Johansen 91989dbf196SJohn Johansen /* helper fn for changing into a hat 92089dbf196SJohn Johansen * 92189dbf196SJohn Johansen * Returns: label for hat transition or ERR_PTR. Does not return NULL 92289dbf196SJohn Johansen */ 92389dbf196SJohn Johansen static struct aa_label *change_hat(struct aa_label *label, const char *hats[], 92489dbf196SJohn Johansen int count, int flags) 92589dbf196SJohn Johansen { 92689dbf196SJohn Johansen struct aa_profile *profile, *root, *hat = NULL; 92789dbf196SJohn Johansen struct aa_label *new; 92889dbf196SJohn Johansen struct label_it it; 92989dbf196SJohn Johansen bool sibling = false; 93089dbf196SJohn Johansen const char *name, *info = NULL; 93189dbf196SJohn Johansen int i, error; 93289dbf196SJohn Johansen 93389dbf196SJohn Johansen AA_BUG(!label); 93489dbf196SJohn Johansen AA_BUG(!hats); 93589dbf196SJohn Johansen AA_BUG(count < 1); 93689dbf196SJohn Johansen 93789dbf196SJohn Johansen if (PROFILE_IS_HAT(labels_profile(label))) 93889dbf196SJohn Johansen sibling = true; 93989dbf196SJohn Johansen 94089dbf196SJohn Johansen /*find first matching hat */ 94189dbf196SJohn Johansen for (i = 0; i < count && !hat; i++) { 94289dbf196SJohn Johansen name = hats[i]; 94389dbf196SJohn Johansen label_for_each_in_ns(it, labels_ns(label), label, profile) { 94489dbf196SJohn Johansen if (sibling && PROFILE_IS_HAT(profile)) { 94589dbf196SJohn Johansen root = aa_get_profile_rcu(&profile->parent); 94689dbf196SJohn Johansen } else if (!sibling && !PROFILE_IS_HAT(profile)) { 94789dbf196SJohn Johansen root = aa_get_profile(profile); 94889dbf196SJohn Johansen } else { /* conflicting change type */ 94989dbf196SJohn Johansen info = "conflicting targets types"; 95089dbf196SJohn Johansen error = -EPERM; 95189dbf196SJohn Johansen goto fail; 95289dbf196SJohn Johansen } 95389dbf196SJohn Johansen hat = aa_find_child(root, name); 95489dbf196SJohn Johansen aa_put_profile(root); 95589dbf196SJohn Johansen if (!hat) { 95689dbf196SJohn Johansen if (!COMPLAIN_MODE(profile)) 95789dbf196SJohn Johansen goto outer_continue; 95889dbf196SJohn Johansen /* complain mode succeed as if hat */ 95989dbf196SJohn Johansen } else if (!PROFILE_IS_HAT(hat)) { 96089dbf196SJohn Johansen info = "target not hat"; 96189dbf196SJohn Johansen error = -EPERM; 96289dbf196SJohn Johansen aa_put_profile(hat); 96389dbf196SJohn Johansen goto fail; 96489dbf196SJohn Johansen } 96589dbf196SJohn Johansen aa_put_profile(hat); 96689dbf196SJohn Johansen } 96789dbf196SJohn Johansen /* found a hat for all profiles in ns */ 96889dbf196SJohn Johansen goto build; 96989dbf196SJohn Johansen outer_continue: 97089dbf196SJohn Johansen ; 97189dbf196SJohn Johansen } 97289dbf196SJohn Johansen /* no hats that match, find appropriate error 97389dbf196SJohn Johansen * 97489dbf196SJohn Johansen * In complain mode audit of the failure is based off of the first 97589dbf196SJohn Johansen * hat supplied. This is done due how userspace interacts with 97689dbf196SJohn Johansen * change_hat. 97789dbf196SJohn Johansen */ 97889dbf196SJohn Johansen name = NULL; 97989dbf196SJohn Johansen label_for_each_in_ns(it, labels_ns(label), label, profile) { 98089dbf196SJohn Johansen if (!list_empty(&profile->base.profiles)) { 98189dbf196SJohn Johansen info = "hat not found"; 98289dbf196SJohn Johansen error = -ENOENT; 98389dbf196SJohn Johansen goto fail; 98489dbf196SJohn Johansen } 98589dbf196SJohn Johansen } 98689dbf196SJohn Johansen info = "no hats defined"; 98789dbf196SJohn Johansen error = -ECHILD; 98889dbf196SJohn Johansen 98989dbf196SJohn Johansen fail: 99089dbf196SJohn Johansen label_for_each_in_ns(it, labels_ns(label), label, profile) { 99189dbf196SJohn Johansen /* 99289dbf196SJohn Johansen * no target as it has failed to be found or built 99389dbf196SJohn Johansen * 99489dbf196SJohn Johansen * change_hat uses probing and should not log failures 99589dbf196SJohn Johansen * related to missing hats 99689dbf196SJohn Johansen */ 99789dbf196SJohn Johansen /* TODO: get rid of GLOBAL_ROOT_UID */ 99889dbf196SJohn Johansen if (count > 1 || COMPLAIN_MODE(profile)) { 99989dbf196SJohn Johansen aa_audit_file(profile, &nullperms, OP_CHANGE_HAT, 100089dbf196SJohn Johansen AA_MAY_CHANGEHAT, name, NULL, NULL, 100189dbf196SJohn Johansen GLOBAL_ROOT_UID, info, error); 100289dbf196SJohn Johansen } 100389dbf196SJohn Johansen } 100489dbf196SJohn Johansen return ERR_PTR(error); 100589dbf196SJohn Johansen 100689dbf196SJohn Johansen build: 100789dbf196SJohn Johansen new = fn_label_build_in_ns(label, profile, GFP_KERNEL, 100889dbf196SJohn Johansen build_change_hat(profile, name, sibling), 100989dbf196SJohn Johansen aa_get_label(&profile->label)); 101089dbf196SJohn Johansen if (!new) { 101189dbf196SJohn Johansen info = "label build failed"; 101289dbf196SJohn Johansen error = -ENOMEM; 101389dbf196SJohn Johansen goto fail; 101489dbf196SJohn Johansen } /* else if (IS_ERR) build_change_hat has logged error so return new */ 101589dbf196SJohn Johansen 101689dbf196SJohn Johansen return new; 1017898127c3SJohn Johansen } 1018898127c3SJohn Johansen 1019898127c3SJohn Johansen /** 1020898127c3SJohn Johansen * aa_change_hat - change hat to/from subprofile 1021898127c3SJohn Johansen * @hats: vector of hat names to try changing into (MAYBE NULL if @count == 0) 1022898127c3SJohn Johansen * @count: number of hat names in @hats 1023898127c3SJohn Johansen * @token: magic value to validate the hat change 1024df8073c6SJohn Johansen * @flags: flags affecting behavior of the change 1025898127c3SJohn Johansen * 102689dbf196SJohn Johansen * Returns %0 on success, error otherwise. 102789dbf196SJohn Johansen * 1028898127c3SJohn Johansen * Change to the first profile specified in @hats that exists, and store 1029898127c3SJohn Johansen * the @hat_magic in the current task context. If the count == 0 and the 1030898127c3SJohn Johansen * @token matches that stored in the current task context, return to the 1031898127c3SJohn Johansen * top level profile. 1032898127c3SJohn Johansen * 103389dbf196SJohn Johansen * change_hat only applies to profiles in the current ns, and each profile 103489dbf196SJohn Johansen * in the ns must make the same transition otherwise change_hat will fail. 1035898127c3SJohn Johansen */ 1036df8073c6SJohn Johansen int aa_change_hat(const char *hats[], int count, u64 token, int flags) 1037898127c3SJohn Johansen { 1038898127c3SJohn Johansen const struct cred *cred; 103955a26ebfSJohn Johansen struct aa_task_ctx *ctx; 104089dbf196SJohn Johansen struct aa_label *label, *previous, *new = NULL, *target = NULL; 104189dbf196SJohn Johansen struct aa_profile *profile; 10422d679f3cSJohn Johansen struct aa_perms perms = {}; 104389dbf196SJohn Johansen const char *info = NULL; 1044898127c3SJohn Johansen int error = 0; 1045898127c3SJohn Johansen 1046c29bceb3SJohn Johansen /* 1047c29bceb3SJohn Johansen * Fail explicitly requested domain transitions if no_new_privs. 1048c29bceb3SJohn Johansen * There is no exception for unconfined as change_hat is not 1049c29bceb3SJohn Johansen * available. 1050c29bceb3SJohn Johansen */ 105189dbf196SJohn Johansen if (task_no_new_privs(current)) { 105289dbf196SJohn Johansen /* not an apparmor denial per se, so don't log it */ 105389dbf196SJohn Johansen AA_DEBUG("no_new_privs - change_hat denied"); 1054c29bceb3SJohn Johansen return -EPERM; 105589dbf196SJohn Johansen } 1056c29bceb3SJohn Johansen 1057898127c3SJohn Johansen /* released below */ 1058898127c3SJohn Johansen cred = get_current_cred(); 105955a26ebfSJohn Johansen ctx = cred_ctx(cred); 1060637f688dSJohn Johansen label = aa_get_newest_cred_label(cred); 106189dbf196SJohn Johansen previous = aa_get_newest_label(ctx->previous); 1062898127c3SJohn Johansen 1063637f688dSJohn Johansen if (unconfined(label)) { 106489dbf196SJohn Johansen info = "unconfined can not change_hat"; 1065898127c3SJohn Johansen error = -EPERM; 106689dbf196SJohn Johansen goto fail; 1067898127c3SJohn Johansen } 1068898127c3SJohn Johansen 1069898127c3SJohn Johansen if (count) { 107089dbf196SJohn Johansen new = change_hat(label, hats, count, flags); 107189dbf196SJohn Johansen AA_BUG(!new); 107289dbf196SJohn Johansen if (IS_ERR(new)) { 107389dbf196SJohn Johansen error = PTR_ERR(new); 107489dbf196SJohn Johansen new = NULL; 107589dbf196SJohn Johansen /* already audited */ 1076898127c3SJohn Johansen goto out; 1077898127c3SJohn Johansen } 1078898127c3SJohn Johansen 107989dbf196SJohn Johansen error = may_change_ptraced_domain(new, &info); 108089dbf196SJohn Johansen if (error) 108189dbf196SJohn Johansen goto fail; 1082898127c3SJohn Johansen 108389dbf196SJohn Johansen if (flags & AA_CHANGE_TEST) 108489dbf196SJohn Johansen goto out; 1085898127c3SJohn Johansen 108689dbf196SJohn Johansen target = new; 108789dbf196SJohn Johansen error = aa_set_current_hat(new, token); 1088898127c3SJohn Johansen if (error == -EACCES) 1089898127c3SJohn Johansen /* kill task in case of brute force attacks */ 109089dbf196SJohn Johansen goto kill; 109189dbf196SJohn Johansen } else if (previous && !(flags & AA_CHANGE_TEST)) { 109289dbf196SJohn Johansen /* Return to saved label. Kill task if restore fails 1093898127c3SJohn Johansen * to avoid brute force attacks 1094898127c3SJohn Johansen */ 109589dbf196SJohn Johansen target = previous; 1096637f688dSJohn Johansen error = aa_restore_previous_label(token); 109789dbf196SJohn Johansen if (error) { 109889dbf196SJohn Johansen if (error == -EACCES) 109989dbf196SJohn Johansen goto kill; 110089dbf196SJohn Johansen goto fail; 110189dbf196SJohn Johansen } 110289dbf196SJohn Johansen } /* else ignore @flags && restores when there is no saved profile */ 1103898127c3SJohn Johansen 1104898127c3SJohn Johansen out: 110589dbf196SJohn Johansen aa_put_label(new); 110689dbf196SJohn Johansen aa_put_label(previous); 1107637f688dSJohn Johansen aa_put_label(label); 1108898127c3SJohn Johansen put_cred(cred); 1109898127c3SJohn Johansen 1110898127c3SJohn Johansen return error; 111189dbf196SJohn Johansen 111289dbf196SJohn Johansen kill: 111389dbf196SJohn Johansen info = "failed token match"; 111489dbf196SJohn Johansen perms.kill = AA_MAY_CHANGEHAT; 111589dbf196SJohn Johansen 111689dbf196SJohn Johansen fail: 111789dbf196SJohn Johansen fn_for_each_in_ns(label, profile, 111889dbf196SJohn Johansen aa_audit_file(profile, &perms, OP_CHANGE_HAT, 111989dbf196SJohn Johansen AA_MAY_CHANGEHAT, NULL, NULL, target, 112089dbf196SJohn Johansen GLOBAL_ROOT_UID, info, error)); 112189dbf196SJohn Johansen 112289dbf196SJohn Johansen goto out; 1123898127c3SJohn Johansen } 1124898127c3SJohn Johansen 112589dbf196SJohn Johansen 1126e00b02bbSJohn Johansen static int change_profile_perms_wrapper(const char *op, const char *name, 1127e00b02bbSJohn Johansen struct aa_profile *profile, 1128e00b02bbSJohn Johansen struct aa_label *target, bool stack, 1129e00b02bbSJohn Johansen u32 request, struct aa_perms *perms) 1130e00b02bbSJohn Johansen { 1131e00b02bbSJohn Johansen const char *info = NULL; 1132e00b02bbSJohn Johansen int error = 0; 1133e00b02bbSJohn Johansen 1134e00b02bbSJohn Johansen /* 1135e00b02bbSJohn Johansen * Fail explicitly requested domain transitions when no_new_privs 1136e00b02bbSJohn Johansen * and not unconfined OR the transition results in a stack on 1137e00b02bbSJohn Johansen * the current label. 1138e00b02bbSJohn Johansen * Stacking domain transitions and transitions from unconfined are 1139e00b02bbSJohn Johansen * allowed even when no_new_privs is set because this aways results 1140e00b02bbSJohn Johansen * in a reduction of permissions. 1141e00b02bbSJohn Johansen */ 1142e00b02bbSJohn Johansen if (task_no_new_privs(current) && !stack && 1143e00b02bbSJohn Johansen !profile_unconfined(profile) && 1144e00b02bbSJohn Johansen !aa_label_is_subset(target, &profile->label)) { 1145e00b02bbSJohn Johansen info = "no new privs"; 1146e00b02bbSJohn Johansen error = -EPERM; 1147e00b02bbSJohn Johansen } 1148e00b02bbSJohn Johansen 1149e00b02bbSJohn Johansen if (!error) 1150e00b02bbSJohn Johansen error = change_profile_perms(profile, target, stack, request, 1151e00b02bbSJohn Johansen profile->file.start, perms); 1152e00b02bbSJohn Johansen if (error) 1153e00b02bbSJohn Johansen error = aa_audit_file(profile, perms, op, request, name, 1154e00b02bbSJohn Johansen NULL, target, GLOBAL_ROOT_UID, info, 1155e00b02bbSJohn Johansen error); 1156e00b02bbSJohn Johansen 1157e00b02bbSJohn Johansen return error; 1158e00b02bbSJohn Johansen } 115989dbf196SJohn Johansen 1160898127c3SJohn Johansen /** 1161898127c3SJohn Johansen * aa_change_profile - perform a one-way profile transition 1162aa9a39adSJohn Johansen * @fqname: name of profile may include namespace (NOT NULL) 1163898127c3SJohn Johansen * @onexec: whether this transition is to take place immediately or at exec 1164df8073c6SJohn Johansen * @flags: flags affecting change behavior 1165898127c3SJohn Johansen * 1166898127c3SJohn Johansen * Change to new profile @name. Unlike with hats, there is no way 1167898127c3SJohn Johansen * to change back. If @name isn't specified the current profile name is 1168898127c3SJohn Johansen * used. 1169898127c3SJohn Johansen * If @onexec then the transition is delayed until 1170898127c3SJohn Johansen * the next exec. 1171898127c3SJohn Johansen * 1172898127c3SJohn Johansen * Returns %0 on success, error otherwise. 1173898127c3SJohn Johansen */ 1174df8073c6SJohn Johansen int aa_change_profile(const char *fqname, int flags) 1175898127c3SJohn Johansen { 1176e00b02bbSJohn Johansen struct aa_label *label, *new = NULL, *target = NULL; 1177e00b02bbSJohn Johansen struct aa_profile *profile; 11782d679f3cSJohn Johansen struct aa_perms perms = {}; 1179e00b02bbSJohn Johansen const char *info = NULL; 1180e00b02bbSJohn Johansen const char *auditname = fqname; /* retain leading & if stack */ 1181e00b02bbSJohn Johansen bool stack = flags & AA_CHANGE_STACK; 118247f6e5ccSJohn Johansen int error = 0; 1183e00b02bbSJohn Johansen char *op; 1184898127c3SJohn Johansen u32 request; 1185898127c3SJohn Johansen 1186aa9a39adSJohn Johansen if (!fqname || !*fqname) { 1187aa9a39adSJohn Johansen AA_DEBUG("no profile name"); 1188898127c3SJohn Johansen return -EINVAL; 1189aa9a39adSJohn Johansen } 1190898127c3SJohn Johansen 1191df8073c6SJohn Johansen if (flags & AA_CHANGE_ONEXEC) { 1192898127c3SJohn Johansen request = AA_MAY_ONEXEC; 1193e00b02bbSJohn Johansen if (stack) 1194e00b02bbSJohn Johansen op = OP_STACK_ONEXEC; 1195e00b02bbSJohn Johansen else 1196898127c3SJohn Johansen op = OP_CHANGE_ONEXEC; 1197898127c3SJohn Johansen } else { 1198898127c3SJohn Johansen request = AA_MAY_CHANGE_PROFILE; 1199e00b02bbSJohn Johansen if (stack) 1200e00b02bbSJohn Johansen op = OP_STACK; 1201e00b02bbSJohn Johansen else 1202898127c3SJohn Johansen op = OP_CHANGE_PROFILE; 1203898127c3SJohn Johansen } 1204898127c3SJohn Johansen 1205e00b02bbSJohn Johansen label = aa_get_current_label(); 1206898127c3SJohn Johansen 1207e00b02bbSJohn Johansen if (*fqname == '&') { 1208e00b02bbSJohn Johansen stack = true; 1209e00b02bbSJohn Johansen /* don't have label_parse() do stacking */ 1210e00b02bbSJohn Johansen fqname++; 1211c29bceb3SJohn Johansen } 1212e00b02bbSJohn Johansen target = aa_label_parse(label, fqname, GFP_KERNEL, true, false); 1213e00b02bbSJohn Johansen if (IS_ERR(target)) { 1214e00b02bbSJohn Johansen struct aa_profile *tprofile; 1215c29bceb3SJohn Johansen 1216e00b02bbSJohn Johansen info = "label not found"; 1217e00b02bbSJohn Johansen error = PTR_ERR(target); 1218e00b02bbSJohn Johansen target = NULL; 1219e00b02bbSJohn Johansen /* 1220e00b02bbSJohn Johansen * TODO: fixme using labels_profile is not right - do profile 1221e00b02bbSJohn Johansen * per complain profile 1222e00b02bbSJohn Johansen */ 1223df8073c6SJohn Johansen if ((flags & AA_CHANGE_TEST) || 1224e00b02bbSJohn Johansen !COMPLAIN_MODE(labels_profile(label))) 1225898127c3SJohn Johansen goto audit; 1226898127c3SJohn Johansen /* released below */ 1227e00b02bbSJohn Johansen tprofile = aa_new_null_profile(labels_profile(label), false, 1228e00b02bbSJohn Johansen fqname, GFP_KERNEL); 1229e00b02bbSJohn Johansen if (!tprofile) { 1230898127c3SJohn Johansen info = "failed null profile create"; 1231898127c3SJohn Johansen error = -ENOMEM; 1232898127c3SJohn Johansen goto audit; 1233898127c3SJohn Johansen } 1234e00b02bbSJohn Johansen target = &tprofile->label; 1235e00b02bbSJohn Johansen goto check; 1236898127c3SJohn Johansen } 1237898127c3SJohn Johansen 1238e00b02bbSJohn Johansen /* 1239e00b02bbSJohn Johansen * self directed transitions only apply to current policy ns 1240e00b02bbSJohn Johansen * TODO: currently requiring perms for stacking and straight change 1241e00b02bbSJohn Johansen * stacking doesn't strictly need this. Determine how much 1242e00b02bbSJohn Johansen * we want to loosen this restriction for stacking 1243e00b02bbSJohn Johansen * 1244e00b02bbSJohn Johansen * if (!stack) { 1245e00b02bbSJohn Johansen */ 1246e00b02bbSJohn Johansen error = fn_for_each_in_ns(label, profile, 1247e00b02bbSJohn Johansen change_profile_perms_wrapper(op, auditname, 1248e00b02bbSJohn Johansen profile, target, stack, 1249e00b02bbSJohn Johansen request, &perms)); 1250e00b02bbSJohn Johansen if (error) 1251e00b02bbSJohn Johansen /* auditing done in change_profile_perms_wrapper */ 1252e00b02bbSJohn Johansen goto out; 1253aa9a39adSJohn Johansen 1254e00b02bbSJohn Johansen /* } */ 1255e00b02bbSJohn Johansen 1256e00b02bbSJohn Johansen check: 1257898127c3SJohn Johansen /* check if tracing task is allowed to trace target domain */ 1258e00b02bbSJohn Johansen error = may_change_ptraced_domain(target, &info); 1259e00b02bbSJohn Johansen if (error && !fn_for_each_in_ns(label, profile, 1260e00b02bbSJohn Johansen COMPLAIN_MODE(profile))) 1261e00b02bbSJohn Johansen goto audit; 1262e00b02bbSJohn Johansen 1263e00b02bbSJohn Johansen /* TODO: add permission check to allow this 1264e00b02bbSJohn Johansen * if ((flags & AA_CHANGE_ONEXEC) && !current_is_single_threaded()) { 1265e00b02bbSJohn Johansen * info = "not a single threaded task"; 1266e00b02bbSJohn Johansen * error = -EACCES; 1267e00b02bbSJohn Johansen * goto audit; 1268e00b02bbSJohn Johansen * } 1269e00b02bbSJohn Johansen */ 1270e00b02bbSJohn Johansen if (flags & AA_CHANGE_TEST) 1271e00b02bbSJohn Johansen goto out; 1272e00b02bbSJohn Johansen 1273e00b02bbSJohn Johansen if (!(flags & AA_CHANGE_ONEXEC)) { 1274e00b02bbSJohn Johansen /* only transition profiles in the current ns */ 1275e00b02bbSJohn Johansen if (stack) 1276e00b02bbSJohn Johansen new = aa_label_merge(label, target, GFP_KERNEL); 1277e00b02bbSJohn Johansen else 1278e00b02bbSJohn Johansen new = fn_label_build_in_ns(label, profile, GFP_KERNEL, 1279e00b02bbSJohn Johansen aa_get_label(target), 1280e00b02bbSJohn Johansen aa_get_label(&profile->label)); 1281e00b02bbSJohn Johansen if (IS_ERR_OR_NULL(new)) { 1282e00b02bbSJohn Johansen info = "failed to build target label"; 1283e00b02bbSJohn Johansen error = PTR_ERR(new); 1284e00b02bbSJohn Johansen new = NULL; 1285e00b02bbSJohn Johansen perms.allow = 0; 1286898127c3SJohn Johansen goto audit; 1287898127c3SJohn Johansen } 1288e00b02bbSJohn Johansen error = aa_replace_current_label(new); 1289e00b02bbSJohn Johansen } else 1290e00b02bbSJohn Johansen /* full transition will be built in exec path */ 1291e00b02bbSJohn Johansen error = aa_set_current_onexec(target, stack); 1292898127c3SJohn Johansen 1293898127c3SJohn Johansen audit: 1294e00b02bbSJohn Johansen error = fn_for_each_in_ns(label, profile, 1295e00b02bbSJohn Johansen aa_audit_file(profile, &perms, op, request, auditname, 1296e00b02bbSJohn Johansen NULL, new ? new : target, 1297e00b02bbSJohn Johansen GLOBAL_ROOT_UID, info, error)); 1298898127c3SJohn Johansen 1299e00b02bbSJohn Johansen out: 1300e00b02bbSJohn Johansen aa_put_label(new); 1301e00b02bbSJohn Johansen aa_put_label(target); 1302637f688dSJohn Johansen aa_put_label(label); 1303898127c3SJohn Johansen 1304898127c3SJohn Johansen return error; 1305898127c3SJohn Johansen } 1306