diff options
Diffstat (limited to 'security/apparmor')
| -rw-r--r-- | security/apparmor/Makefile | 5 | ||||
| -rw-r--r-- | security/apparmor/audit.c | 6 | ||||
| -rw-r--r-- | security/apparmor/domain.c | 5 | ||||
| -rw-r--r-- | security/apparmor/file.c | 18 | ||||
| -rw-r--r-- | security/apparmor/include/apparmor.h | 15 | ||||
| -rw-r--r-- | security/apparmor/include/audit.h | 4 | ||||
| -rw-r--r-- | security/apparmor/include/match.h | 3 | ||||
| -rw-r--r-- | security/apparmor/include/path.h | 3 | ||||
| -rw-r--r-- | security/apparmor/include/policy.h | 15 | ||||
| -rw-r--r-- | security/apparmor/match.c | 80 | ||||
| -rw-r--r-- | security/apparmor/path.c | 55 | ||||
| -rw-r--r-- | security/apparmor/policy.c | 3 | ||||
| -rw-r--r-- | security/apparmor/policy_unpack.c | 29 |
13 files changed, 189 insertions, 52 deletions
diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile index 86103ce5b7a..7e14edd9ec6 100644 --- a/security/apparmor/Makefile +++ b/security/apparmor/Makefile @@ -15,7 +15,7 @@ clean-files := capability_names.h rlim_names.h # to # [1] = "dac_override", quiet_cmd_make-caps = GEN $@ -cmd_make-caps = echo "static const char *capability_names[] = {" > $@ ;\ +cmd_make-caps = echo "static const char const *capability_names[] = {" > $@ ;\ sed $< >>$@ -r -n -e '/CAP_FS_MASK/d' \ -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/[\2] = "\L\1",/p';\ echo "};" >> $@ @@ -43,7 +43,8 @@ cmd_make-caps = echo "static const char *capability_names[] = {" > $@ ;\ # to # #define AA_FS_RLIMIT_MASK "fsize stack" quiet_cmd_make-rlim = GEN $@ -cmd_make-rlim = echo "static const char *rlim_names[RLIM_NLIMITS] = {" > $@ ;\ +cmd_make-rlim = echo "static const char const *rlim_names[RLIM_NLIMITS] = {" \ + > $@ ;\ sed $< >> $@ -r -n \ -e 's/^\# ?define[ \t]+(RLIMIT_([A-Z0-9_]+)).*/[\1] = "\L\2",/p';\ echo "};" >> $@ ;\ diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c index 61344b56722..5ff67776a5a 100644 --- a/security/apparmor/audit.c +++ b/security/apparmor/audit.c @@ -19,7 +19,7 @@ #include "include/audit.h" #include "include/policy.h" -const char *op_table[] = { +const char *const op_table[] = { "null", "sysctl", @@ -73,7 +73,7 @@ const char *op_table[] = { "profile_remove" }; -const char *audit_mode_names[] = { +const char *const audit_mode_names[] = { "normal", "quiet_denied", "quiet", @@ -81,7 +81,7 @@ const char *audit_mode_names[] = { "all" }; -static char *aa_audit_type[] = { +static const char *const aa_audit_type[] = { "AUDIT", "ALLOWED", "DENIED", diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index c1e18ba5bdc..7c69599a69e 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -372,13 +372,12 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm) state = profile->file.start; /* buffer freed below, name is pointer into buffer */ - error = aa_get_name(&bprm->file->f_path, profile->path_flags, &buffer, - &name); + error = aa_path_name(&bprm->file->f_path, profile->path_flags, &buffer, + &name, &info); if (error) { if (profile->flags & (PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED)) error = 0; - info = "Exec failed name resolution"; name = bprm->filename; goto audit; } diff --git a/security/apparmor/file.c b/security/apparmor/file.c index bba875c4d06..3022c0f4f0d 100644 --- a/security/apparmor/file.c +++ b/security/apparmor/file.c @@ -278,22 +278,16 @@ int aa_path_perm(int op, struct aa_profile *profile, struct path *path, int error; flags |= profile->path_flags | (S_ISDIR(cond->mode) ? PATH_IS_DIR : 0); - error = aa_get_name(path, flags, &buffer, &name); + error = aa_path_name(path, flags, &buffer, &name, &info); if (error) { if (error == -ENOENT && is_deleted(path->dentry)) { /* Access to open files that are deleted are * give a pass (implicit delegation) */ error = 0; + info = NULL; perms.allow = request; - } else if (error == -ENOENT) - info = "Failed name lookup - deleted entry"; - else if (error == -ESTALE) - info = "Failed name lookup - disconnected path"; - else if (error == -ENAMETOOLONG) - info = "Failed name lookup - name too long"; - else - info = "Failed name lookup"; + } } else { aa_str_perms(profile->file.dfa, profile->file.start, name, cond, &perms); @@ -364,12 +358,14 @@ int aa_path_link(struct aa_profile *profile, struct dentry *old_dentry, lperms = nullperms; /* buffer freed below, lname is pointer in buffer */ - error = aa_get_name(&link, profile->path_flags, &buffer, &lname); + error = aa_path_name(&link, profile->path_flags, &buffer, &lname, + &info); if (error) goto audit; /* buffer2 freed below, tname is pointer in buffer2 */ - error = aa_get_name(&target, profile->path_flags, &buffer2, &tname); + error = aa_path_name(&target, profile->path_flags, &buffer2, &tname, + &info); if (error) goto audit; diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h index df364956081..40aedd9f73e 100644 --- a/security/apparmor/include/apparmor.h +++ b/security/apparmor/include/apparmor.h @@ -19,6 +19,19 @@ #include "match.h" +/* + * Class of mediation types in the AppArmor policy db + */ +#define AA_CLASS_ENTRY 0 +#define AA_CLASS_UNKNOWN 1 +#define AA_CLASS_FILE 2 +#define AA_CLASS_CAP 3 +#define AA_CLASS_NET 4 +#define AA_CLASS_RLIMITS 5 +#define AA_CLASS_DOMAIN 6 + +#define AA_CLASS_LAST AA_CLASS_DOMAIN + /* Control parameters settable through module/boot flags */ extern enum audit_mode aa_g_audit; extern bool aa_g_audit_header; @@ -81,7 +94,7 @@ static inline unsigned int aa_dfa_null_transition(struct aa_dfa *dfa, unsigned int start) { /* the null transition only needs the string's null terminator byte */ - return aa_dfa_match_len(dfa, start, "", 1); + return aa_dfa_next(dfa, start, 0); } static inline bool mediated_filesystem(struct inode *inode) diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h index 9317cd81416..4ba78c203af 100644 --- a/security/apparmor/include/audit.h +++ b/security/apparmor/include/audit.h @@ -25,7 +25,7 @@ struct aa_profile; -extern const char *audit_mode_names[]; +extern const char *const audit_mode_names[]; #define AUDIT_MAX_INDEX 5 enum audit_mode { @@ -47,7 +47,7 @@ enum audit_type { AUDIT_APPARMOR_AUTO }; -extern const char *op_table[]; +extern const char *const op_table[]; enum aa_ops { OP_NULL, diff --git a/security/apparmor/include/match.h b/security/apparmor/include/match.h index a4a863997bd..775843e7f98 100644 --- a/security/apparmor/include/match.h +++ b/security/apparmor/include/match.h @@ -116,6 +116,9 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, const char *str, int len); unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start, const char *str); +unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state, + const char c); + void aa_dfa_free_kref(struct kref *kref); /** diff --git a/security/apparmor/include/path.h b/security/apparmor/include/path.h index 27b327a7fae..286ac75dc88 100644 --- a/security/apparmor/include/path.h +++ b/security/apparmor/include/path.h @@ -26,6 +26,7 @@ enum path_flags { PATH_MEDIATE_DELETED = 0x10000, /* mediate deleted paths */ }; -int aa_get_name(struct path *path, int flags, char **buffer, const char **name); +int aa_path_name(struct path *path, int flags, char **buffer, + const char **name, const char **info); #endif /* __AA_PATH_H */ diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h index aeda5cf5690..bda4569fdd8 100644 --- a/security/apparmor/include/policy.h +++ b/security/apparmor/include/policy.h @@ -29,7 +29,7 @@ #include "file.h" #include "resource.h" -extern const char *profile_mode_names[]; +extern const char *const profile_mode_names[]; #define APPARMOR_NAMES_MAX_INDEX 3 #define COMPLAIN_MODE(_profile) \ @@ -129,6 +129,17 @@ struct aa_namespace { struct list_head sub_ns; }; +/* struct aa_policydb - match engine for a policy + * dfa: dfa pattern match + * start: set of start states for the different classes of data + */ +struct aa_policydb { + /* Generic policy DFA specific rule types will be subsections of it */ + struct aa_dfa *dfa; + unsigned int start[AA_CLASS_LAST + 1]; + +}; + /* struct aa_profile - basic confinement data * @base - base components of the profile (name, refcount, lists, lock ...) * @parent: parent of profile @@ -143,6 +154,7 @@ struct aa_namespace { * @flags: flags controlling profile behavior * @path_flags: flags controlling path generation behavior * @size: the memory consumed by this profiles rules + * @policy: general match rules governing policy * @file: The set of rules governing basic file access and domain transitions * @caps: capabilities for the profile * @rlimits: rlimits for the profile @@ -179,6 +191,7 @@ struct aa_profile { u32 path_flags; int size; + struct aa_policydb policy; struct aa_file_rules file; struct aa_caps caps; struct aa_rlimit rlimits; diff --git a/security/apparmor/match.c b/security/apparmor/match.c index 94de6b4907c..90971a8c378 100644 --- a/security/apparmor/match.c +++ b/security/apparmor/match.c @@ -335,12 +335,12 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, } /** - * aa_dfa_next_state - traverse @dfa to find state @str stops at + * aa_dfa_match - traverse @dfa to find state @str stops at * @dfa: the dfa to match @str against (NOT NULL) * @start: the state of the dfa to start matching in * @str: the null terminated string of bytes to match against the dfa (NOT NULL) * - * aa_dfa_next_state will match @str against the dfa and return the state it + * aa_dfa_match will match @str against the dfa and return the state it * finished matching in. The final state can be used to look up the accepting * label, or as the start state of a continuing match. * @@ -349,5 +349,79 @@ unsigned int aa_dfa_match_len(struct aa_dfa *dfa, unsigned int start, unsigned int aa_dfa_match(struct aa_dfa *dfa, unsigned int start, const char *str) { - return aa_dfa_match_len(dfa, start, str, strlen(str)); + u16 *def = DEFAULT_TABLE(dfa); + u32 *base = BASE_TABLE(dfa); + u16 *next = NEXT_TABLE(dfa); + u16 *check = CHECK_TABLE(dfa); + unsigned int state = start, pos; + + if (state == 0) + return 0; + + /* current state is <state>, matching character *str */ + if (dfa->tables[YYTD_ID_EC]) { + /* Equivalence class table defined */ + u8 *equiv = EQUIV_TABLE(dfa); + /* default is direct to next state */ + while (*str) { + pos = base[state] + equiv[(u8) *str++]; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + } else { + /* default is direct to next state */ + while (*str) { + pos = base[state] + (u8) *str++; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + } + + return state; +} + +/** + * aa_dfa_next - step one character to the next state in the dfa + * @dfa: the dfa to tranverse (NOT NULL) + * @state: the state to start in + * @c: the input character to transition on + * + * aa_dfa_match will step through the dfa by one input character @c + * + * Returns: state reach after input @c + */ +unsigned int aa_dfa_next(struct aa_dfa *dfa, unsigned int state, + const char c) +{ + u16 *def = DEFAULT_TABLE(dfa); + u32 *base = BASE_TABLE(dfa); + u16 *next = NEXT_TABLE(dfa); + u16 *check = CHECK_TABLE(dfa); + unsigned int pos; + + /* current state is <state>, matching character *str */ + if (dfa->tables[YYTD_ID_EC]) { + /* Equivalence class table defined */ + u8 *equiv = EQUIV_TABLE(dfa); + /* default is direct to next state */ + + pos = base[state] + equiv[(u8) c]; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } else { + /* default is direct to next state */ + pos = base[state] + (u8) c; + if (check[pos] == state) + state = next[pos]; + else + state = def[state]; + } + + return state; } diff --git a/security/apparmor/path.c b/security/apparmor/path.c index c31ce837fef..2daeea4f926 100644 --- a/security/apparmor/path.c +++ b/security/apparmor/path.c @@ -83,30 +83,29 @@ static int d_namespace_path(struct path *path, char *buf, int buflen, struct path root; get_fs_root(current->fs, &root); res = __d_path(path, &root, buf, buflen); - if (res && !IS_ERR(res)) { - /* everything's fine */ - *name = res; - path_put(&root); - goto ok; - } path_put(&root); - connected = 0; - } else + } else { res = d_absolute_path(path, buf, buflen); + if (!our_mnt(path->mnt)) + connected = 0; + } - *name = res; /* handle error conditions - and still allow a partial path to * be returned. */ - if (IS_ERR(res)) { - error = PTR_ERR(res); - *name = buf; - goto out; - } - if (!our_mnt(path->mnt)) + if (!res || IS_ERR(res)) { connected = 0; + res = dentry_path_raw(path->dentry, buf, buflen); + if (IS_ERR(res)) { + error = PTR_ERR(res); + *name = buf; + goto out; + }; + } else if (!our_mnt(path->mnt)) + connected = 0; + + *name = res; -ok: /* Handle two cases: * 1. A deleted dentry && profile is not allowing mediation of deleted * 2. On some filesystems, newly allocated dentries appear to the @@ -137,7 +136,7 @@ ok: /* disconnected path, don't return pathname starting * with '/' */ - error = -ESTALE; + error = -EACCES; if (*res == '/') *name = res + 1; } @@ -158,7 +157,7 @@ out: * Returns: %0 else error on failure */ static int get_name_to_buffer(struct path *path, int flags, char *buffer, - int size, char **name) + int size, char **name, const char **info) { int adjust = (flags & PATH_IS_DIR) ? 1 : 0; int error = d_namespace_path(path, buffer, size - adjust, name, flags); @@ -170,15 +169,27 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer, */ strcpy(&buffer[size - 2], "/"); + if (info && error) { + if (error == -ENOENT) + *info = "Failed name lookup - deleted entry"; + else if (error == -ESTALE) + *info = "Failed name lookup - disconnected path"; + else if (error == -ENAMETOOLONG) + *info = "Failed name lookup - name too long"; + else + *info = "Failed name lookup"; + } + return error; } /** - * aa_get_name - compute the pathname of a file + * aa_path_name - compute the pathname of a file * @path: path the file (NOT NULL) * @flags: flags controlling path name generation * @buffer: buffer that aa_get_name() allocated (NOT NULL) * @name: Returns - the generated path name if !error (NOT NULL) + * @info: Returns - information on why the path lookup failed (MAYBE NULL) * * @name is a pointer to the beginning of the pathname (which usually differs * from the beginning of the buffer), or NULL. If there is an error @name @@ -191,7 +202,8 @@ static int get_name_to_buffer(struct path *path, int flags, char *buffer, * * Returns: %0 else error code if could retrieve name */ -int aa_get_name(struct path *path, int flags, char **buffer, const char **name) +int aa_path_name(struct path *path, int flags, char **buffer, const char **name, + const char **info) { char *buf, *str = NULL; int size = 256; @@ -205,7 +217,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name) if (!buf) return -ENOMEM; - error = get_name_to_buffer(path, flags, buf, size, &str); + error = get_name_to_buffer(path, flags, buf, size, &str, info); if (error != -ENAMETOOLONG) break; @@ -213,6 +225,7 @@ int aa_get_name(struct path *path, int flags, char **buffer, const char **name) size <<= 1; if (size > aa_g_path_max) return -ENAMETOOLONG; + *info = NULL; } *buffer = buf; *name = str; diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c index 4f0eadee78b..90641438302 100644 --- a/security/apparmor/policy.c +++ b/security/apparmor/policy.c @@ -93,7 +93,7 @@ /* root profile namespace */ struct aa_namespace *root_ns; -const char *profile_mode_names[] = { +const char *const profile_mode_names[] = { "enforce", "complain", "kill", @@ -749,6 +749,7 @@ static void free_profile(struct aa_profile *profile) aa_free_sid(profile->sid); aa_put_dfa(profile->xmatch); + aa_put_dfa(profile->policy.dfa); aa_put_profile(profile->replacedby); diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c index 5c46acf5aa6..25fd51edc8d 100644 --- a/security/apparmor/policy_unpack.c +++ b/security/apparmor/policy_unpack.c @@ -84,7 +84,7 @@ static void audit_cb(struct audit_buffer *ab, void *va) * @new: profile if it has been allocated (MAYBE NULL) * @name: name of the profile being manipulated (MAYBE NULL) * @info: any extra info about the failure (MAYBE NULL) - * @e: buffer position info (NOT NULL) + * @e: buffer position info * @error: error code * * Returns: %0 or error @@ -95,7 +95,8 @@ static int audit_iface(struct aa_profile *new, const char *name, struct aa_profile *profile = __aa_current_profile(); struct common_audit_data sa; COMMON_AUDIT_DATA_INIT(&sa, NONE); - sa.aad.iface.pos = e->pos - e->start; + if (e) + sa.aad.iface.pos = e->pos - e->start; sa.aad.iface.target = new; sa.aad.name = name; sa.aad.info = info; @@ -468,7 +469,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) { struct aa_profile *profile = NULL; const char *name = NULL; - int error = -EPROTO; + int i, error = -EPROTO; kernel_cap_t tmpcap; u32 tmp; @@ -561,6 +562,28 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) if (!unpack_rlimits(e, profile)) goto fail; + if (unpack_nameX(e, AA_STRUCT, "policydb")) { + /* generic policy dfa - optional and may be NULL */ + profile->policy.dfa = unpack_dfa(e); + if (IS_ERR(profile->policy.dfa)) { + error = PTR_ERR(profile->policy.dfa); + profile->policy.dfa = NULL; + goto fail; + } + if (!unpack_u32(e, &profile->policy.start[0], "start")) + /* default start state */ + profile->policy.start[0] = DFA_START; + /* setup class index */ + for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) { + profile->policy.start[i] = + aa_dfa_next(profile->policy.dfa, + profile->policy.start[0], + i); + } + if (!unpack_nameX(e, AA_STRUCTEND, NULL)) + goto fail; + } + /* get file rules */ profile->file.dfa = unpack_dfa(e); if (IS_ERR(profile->file.dfa)) { |