4 * Copyright (c) 2000 - 2012 Samsung Electronics Co., Ltd All Rights Reserved
6 * Contact: Kidong Kim <kd0228.kim@samsung.com>
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
26 #include <sys/types.h>
38 #include <sys/smack.h>
39 #include <linux/capability.h>
40 #include <sys/capability.h>
44 #include "privilege-control.h"
45 #include "access-db.h"
50 #define DEVELOPER_GID 5100
51 #define DEVELOPER_UID 5100
53 #define APP_USER_NAME "app"
54 #define DEV_USER_NAME "developer"
56 #define APP_HOME_DIR TOSTRING(HOMEDIR) "/app"
57 #define DEV_HOME_DIR TOSTRING(HOMEDIR) "/developer"
59 #define APP_GROUP_PATH TOSTRING(SHAREDIR) "/app_group_list"
60 #define DEV_GROUP_PATH TOSTRING(SHAREDIR) "/dev_group_list"
62 #define SMACK_RULES_DIR "/etc/smack/accesses.d/"
64 #define SMACK_APP_LABEL_TEMPLATE "~APP~"
65 #define SMACK_SRC_FILE_SUFFIX "_src_file"
66 #define SMACK_SRC_DIR_SUFFIX "_src_dir"
67 #define SMACK_DATA_SUFFIX "_data"
68 #define WRT_BASE_DEVCAP "WRT"
69 #define WRT_CLIENT_PATH "/usr/bin/wrt-client"
71 #define SMACK_ANTIVIRUS_PERM "antivirus"
81 typedef struct state_node_t {
85 static void *state_tree = NULL;
93 typedef int (*label_decision_fn)(const FTSENT*);
99 int state_tree_cmp(const void *first, const void *second)
101 return strcmp(((state_node*)first)->key,
102 ((state_node*)second)->key);
105 int state_tree_push(const char* key_param, const char* value_param)
107 state_node *node = malloc(sizeof(state_node));
108 char *key = strdup(key_param);
109 char *value = strdup(value_param);
111 if (!node || !key || !value) {
115 return PC_ERR_MEM_OPERATION;
121 if (NULL != tfind(node, &state_tree, state_tree_cmp)){
125 return PC_OPERATION_SUCCESS; // 04.2013 Temporary fix. Allow for multiple call of app_give_access
128 tsearch(node, &state_tree, state_tree_cmp);
129 return PC_OPERATION_SUCCESS;
132 char* state_tree_pop_new(char *key)
134 state_node search, *node;
140 wtf = tfind(&search, &state_tree, state_tree_cmp);
144 node = *(state_node**)wtf;
148 tdelete(node, &state_tree, state_tree_cmp);
156 int state_save(const char *subject, const char *object, const char *perm)
159 if (-1 == asprintf(&key, "%s|%s", subject, object))
160 return PC_ERR_INVALID_OPERATION;
161 int ret = state_tree_push(key, perm);
166 int state_restore(const char* subject, const char* object)
169 char *perm AUTO_FREE;
170 struct smack_accesses *smack AUTO_SMACK_FREE;
172 if (-1 == asprintf(&key, "%s|%s", subject, object))
173 return PC_ERR_INVALID_OPERATION;
175 perm = state_tree_pop_new(key);
177 return PC_ERR_INVALID_OPERATION;
179 if (smack_accesses_new(&smack))
180 return PC_ERR_MEM_OPERATION;
182 if (smack_accesses_add(smack, subject, object, perm))
183 return PC_ERR_MEM_OPERATION;
185 if (smack_accesses_apply(smack))
186 return PC_ERR_NOT_PERMITTED;
188 return PC_OPERATION_SUCCESS;
191 static inline int have_smack(void)
193 static int have_smack = -1;
195 if (-1 == have_smack) {
196 if (NULL == smack_smackfs_path()) {
197 C_LOGD("Libprivilage-control: no smack found on phone");
200 C_LOGD("Libprivilege-control: found smack on phone");
208 API int control_privilege(void)
210 C_LOGD("Enter function: %s", __func__);
211 if(getuid() == APP_UID) // current user is 'app'
212 return PC_OPERATION_SUCCESS;
214 if(set_app_privilege("org.tizen.", NULL, NULL) == PC_OPERATION_SUCCESS)
215 return PC_OPERATION_SUCCESS;
217 return PC_ERR_NOT_PERMITTED;
221 * TODO: this function should be moved to libsmack in open-source.
223 API int get_smack_label_from_process(pid_t pid, char smack_label[SMACK_LABEL_LEN + 1])
225 C_LOGD("Enter function: %s", __func__);
228 int PATH_MAX_LEN = 64;
229 char path[PATH_MAX_LEN + 1];
232 ret = PC_ERR_INVALID_PARAM;
236 bzero(smack_label, SMACK_LABEL_LEN + 1);
237 if (!have_smack()) { // If no smack just return success with empty label
238 C_LOGD("No SMACK. Return empty label");
239 ret = PC_OPERATION_SUCCESS;
243 bzero(path, PATH_MAX_LEN + 1);
244 snprintf(path, PATH_MAX_LEN, "/proc/%d/attr/current", pid);
245 fd = open(path, O_RDONLY);
247 C_LOGE("cannot open file %s (errno: %s)", path, strerror(errno));
248 ret = PC_ERR_FILE_OPERATION;
252 ret = read(fd, smack_label, SMACK_LABEL_LEN);
254 C_LOGE("cannot read from file %s", path);
255 ret = PC_ERR_FILE_OPERATION;
259 ret = PC_OPERATION_SUCCESS;
265 API int smack_pid_have_access(pid_t pid,
267 const char *access_type)
269 C_LOGD("Enter function: %s", __func__);
271 char pid_subject_label[SMACK_LABEL_LEN + 1];
273 cap_flag_value_t cap_v;
276 C_LOGD("No SMACK. Return access granted");
280 if (pid < 0 || object == NULL || strlen(object) == 0 ||
281 access_type == NULL || strlen(access_type) == 0) {
282 C_LOGE("Invalid param");
286 //get SMACK label of process
287 ret = get_smack_label_from_process(pid, pid_subject_label);
288 if (PC_OPERATION_SUCCESS != ret) {
289 C_LOGE("get_smack_label_from_process %d failed: %d", pid, ret);
292 C_LOGD("pid %d have label: %s", pid, pid_subject_label);
294 // if read empty label then do not call smack_have_access()
295 if (pid_subject_label[0] != '\0') {
296 ret = smack_have_access(pid_subject_label, object, access_type);
298 C_LOGE("smack_have_access failed");
301 if ( 1 == ret ) { // smack_have_access return 1 (access granted)
302 C_LOGD("smack_have_access return 1 (access granted)");
307 // smack_have_access return 0 (access denied). Now CAP_MAC_OVERRIDE should be checked
308 C_LOGD("smack_have_access return 0 (access denied)");
309 cap = cap_get_pid(pid);
311 C_LOGE("cap_get_pid failed");
314 ret = cap_get_flag(cap, CAP_MAC_OVERRIDE, CAP_EFFECTIVE, &cap_v);
316 C_LOGE("cap_get_flag failed");
320 if (cap_v == CAP_SET) {
321 C_LOGD("pid %d have CAP_MAC_OVERRIDE", pid);
325 C_LOGD("pid %d have no CAP_MAC_OVERRIDE", pid);
330 static int set_dac(const char *smack_label, const char *pkg_name)
332 C_LOGD("Enter function: %s", __func__);
333 FILE* fp_group = NULL; // /etc/group
334 uid_t t_uid = -1; // uid of current process
335 gid_t *glist = NULL; // group list
336 gid_t temp_gid = -1; // for group list
337 char buf[10] = {0, }; // contents in group_list file
338 int glist_cnt = 0; // for group list
342 unsigned *additional_gids = NULL;
345 * initialize user structure
347 C_LOGD("initialize user structure");
348 memset(usr.user_name, 0x00, 10);
349 memset(usr.home_dir, 0x00, 64);
350 memset(usr.group_list, 0x00, 64);
355 C_LOGD("Current uid is %d", t_uid);
357 if(t_uid == 0) // current user is 'root'
359 if(!strncmp(pkg_name, "developer", 9))
361 strncpy(usr.user_name, DEV_USER_NAME, sizeof(usr.user_name));
362 usr.uid = DEVELOPER_UID;
363 usr.gid = DEVELOPER_GID;
364 strncpy(usr.home_dir, DEV_HOME_DIR, sizeof(usr.home_dir));
365 strncpy(usr.group_list, DEV_GROUP_PATH, sizeof(usr.group_list));
369 strncpy(usr.user_name, APP_USER_NAME, sizeof(usr.user_name));
372 strncpy(usr.home_dir, APP_HOME_DIR, sizeof(usr.home_dir));
373 strncpy(usr.group_list, APP_GROUP_PATH, sizeof(usr.group_list));
377 * get group information
379 C_LOGD("get group information");
380 if(!(fp_group = fopen(usr.group_list, "r")))
382 C_LOGE("[ERR] file open error: [%s]\n", usr.group_list);
383 result = PC_ERR_FILE_OPERATION; // return -1
387 while(fgets(buf, 10, fp_group) != NULL)
390 temp_gid = strtoul(buf, 0, 10);
391 if(errno != 0) // error occured during strtoul()
393 C_LOGE("[ERR] cannot change string to integer: [%s]", buf);
394 result = PC_ERR_INVALID_OPERATION;
398 glist = (gid_t*)realloc(glist, sizeof(gid_t) * (glist_cnt + 1));
401 result = PC_ERR_MEM_OPERATION; // return -2
402 C_LOGE("Cannot allocate memory");
405 glist[glist_cnt] = temp_gid;
415 result = get_app_gids(smack_label, &additional_gids, &cnt);
416 if (result != PC_OPERATION_SUCCESS)
420 glist_new = (gid_t*)realloc(glist, sizeof(gid_t) * (glist_cnt + cnt));
421 if (glist_new == NULL) {
422 result = PC_ERR_MEM_OPERATION; // return -2
423 C_LOGE("Cannot allocate memory");
427 for (i = 0; i < cnt; ++i) {
428 C_LOGD("Additional GID based on enabled permissions: %u", additional_gids[i]);
429 glist[glist_cnt++] = additional_gids[i];
437 C_LOGD("Adding process to the following groups:");
438 for(i=0; i<glist_cnt; ++i) {
439 C_LOGD("glist [ %d ] = %d", i, glist[i]);
441 C_LOGD("setgroups()");
442 if(setgroups(glist_cnt, glist) != 0)
444 C_LOGE("[ERR] setgrouops fail\n");
445 result = PC_ERR_NOT_PERMITTED; // return -3
455 * setuid() & setgid()
457 C_LOGD("setgid( %d ) & setuid( %d )", usr.gid, usr.uid);
458 if(setgid(usr.gid) != 0) // fail
460 C_LOGE("[ERR] fail to execute setgid().");
461 result = PC_ERR_INVALID_OPERATION;
464 if(setuid(usr.uid) != 0) // fail
466 C_LOGE("[ERR] fail to execute setuid().");
467 result = PC_ERR_INVALID_OPERATION;
471 C_LOGD("setenv(): USER = %s, HOME = %s", usr.user_name, usr.home_dir);
472 if(setenv("USER", usr.user_name, 1) != 0) //fail
474 C_LOGE("[ERR] fail to execute setenv() [USER].");
475 result = PC_ERR_INVALID_OPERATION;
478 if(setenv("HOME", usr.home_dir, 1) != 0) // fail
480 C_LOGE("[ERR] fail to execute setenv() [HOME].");
481 result = PC_ERR_INVALID_OPERATION;
485 else // current user is not only 'root' but 'app'
487 C_LOGE("[ERR] current user is NOT root\n");
488 result = PC_ERR_NOT_PERMITTED; // return -3
492 result = PC_OPERATION_SUCCESS;
499 free(additional_gids);
505 * Set process SMACK label from EXEC label of a file.
506 * This function is emulating EXEC label behaviour of SMACK for programs
507 * run by dlopen/dlsym instead of execv.
509 * @param path file path to take label from
510 * @return PC_OPERATION_SUCCESS on success, PC_ERR_* on error
512 static int set_smack_from_binary(char **smack_label, const char* path, app_type_t type)
514 C_LOGD("Enter function: %s", __func__);
517 C_LOGD("Path: %s", path);
520 if(type == APP_TYPE_WGT) {
521 ret = smack_lgetlabel(path, smack_label, SMACK_LABEL_EXEC);
523 ret = smack_getlabel(path, smack_label, SMACK_LABEL_EXEC);
526 C_LOGE("Getting exec label from file %s failed", path);
527 return PC_ERR_INVALID_OPERATION;
530 if (*smack_label == NULL) {
531 /* No label to set, just return with success */
532 C_LOGD("No label to set, just return with success");
533 ret = PC_OPERATION_SUCCESS;
536 C_LOGD("label = %s", *smack_label);
538 ret = smack_set_label_for_self(*smack_label);
539 C_LOGD("smack_set_label_for_self returned %d", ret);
541 ret = PC_OPERATION_SUCCESS;
547 static int is_widget(const char* path)
549 C_LOGD("Enter function: %s", __func__);
550 char buf[sizeof(WRT_CLIENT_PATH)];
553 ret = readlink(path, buf, sizeof(WRT_CLIENT_PATH));
555 C_LOGD("readlink(%s) returned error: %s. Assuming that app is not a widget", path, strerror(errno));
556 else if (ret == sizeof(WRT_CLIENT_PATH))
557 C_LOGD("%s is not a widget", path);
558 if (ret == -1 || ret == sizeof(WRT_CLIENT_PATH))
561 C_LOGD("buf = %s", buf);
563 ret = !strcmp(WRT_CLIENT_PATH, buf);
564 C_LOGD("%s is %s widget", path, ret ? "a" : "not a");
569 * Partially verify, that the type given for app is correct.
570 * This function will use some heuristics to check whether the app type is right.
571 * It is intended for security hardening to catch privilege setting for the
572 * app type not corresponding to the actual binary.
573 * Beware - when it detects an anomaly, the whole process will be terminated.
575 * @param type claimed application type
576 * @param path file path to executable
577 * @return return void on success, terminate the process on error
579 static app_type_t verify_app_type(const char* type, const char* path)
581 C_LOGD("Enter function: %s", __func__);
582 /* TODO: this should actually be treated as error, but until the old
583 * set_privilege API is removed, it must be ignored */
585 C_LOGD("PKG_TYPE_OTHER");
586 return APP_TYPE_OTHER; /* good */
589 if (is_widget(path)) {
590 if (!strcmp(type, "wgt")) {
591 C_LOGD("PKG_TYPE_WGT");
592 return APP_TYPE_WGT; /* good */
595 if (type == NULL || strcmp(type, "wgt")){
596 C_LOGD("PKG_TYPE_OTHER");
597 return APP_TYPE_OTHER; /* good */
602 C_LOGE("EXIT_FAILURE");
606 API int set_app_privilege(const char* name, const char* type, const char* path)
608 C_LOGD("Enter function: %s", __func__);
609 C_LOGD("Function params: name = %s, type = %s, path = %s", name, type, path);
610 char *smack_label AUTO_FREE;
611 int ret = PC_OPERATION_SUCCESS;
614 app_type = verify_app_type(type, path);
616 ret = set_smack_from_binary(&smack_label, path, app_type);
617 if (ret != PC_OPERATION_SUCCESS)
620 return set_dac(smack_label, name);
623 API int set_privilege(const char* pkg_name)
625 C_LOGD("Enter function: %s", __func__);
626 return set_app_privilege(pkg_name, NULL, NULL);
629 static inline const char* app_type_name(app_type_t app_type)
641 static int perm_file_path(char** path, app_type_t app_type, const char* perm, const char *suffix)
643 const char* app_type_prefix = NULL;
644 const char* perm_basename = NULL;
647 if (perm == NULL || strlen(perm) == 0) {
648 C_LOGE("empty permission name");
649 return PC_ERR_INVALID_PARAM;
652 app_type_prefix = app_type_name(app_type);
654 perm_basename = strrchr(perm, '/');
658 perm_basename = perm;
660 ret = asprintf(path, TOSTRING(SHAREDIR) "/%s%s%s%s",
661 app_type_prefix ? app_type_prefix : "", app_type_prefix ? "_" : "",
662 perm_basename, suffix);
664 C_LOGE("asprintf failed");
665 return PC_ERR_MEM_OPERATION;
668 return PC_OPERATION_SUCCESS;
671 static bool file_exists(const char* path) {
672 FILE* file = fopen(path, "r");
680 static int perm_to_smack(struct smack_accesses* smack, const char* app_label, app_type_t app_type, const char* perm)
682 C_LOGD("Enter function: %s", __func__);
684 char* path AUTO_FREE;
685 char* format_string AUTO_FREE;
686 FILE* file AUTO_FCLOSE;
687 char smack_subject[SMACK_LABEL_LEN + 1];
688 char smack_object[SMACK_LABEL_LEN + 1];
689 char smack_accesses[10];
691 // get file name for permission (devcap)
692 ret = perm_file_path(&path, app_type, perm, ".smack");
693 if (ret != PC_OPERATION_SUCCESS) {
694 C_LOGD("No smack config file for permission %s", perm);
698 if (asprintf(&format_string,"%%%ds %%%ds %%%lus\n",
699 SMACK_LABEL_LEN, SMACK_LABEL_LEN, (unsigned long)sizeof(smack_accesses)) == -1) {
700 C_LOGE("asprintf failed");
701 return PC_ERR_MEM_OPERATION;
704 file = fopen(path, "r");
705 C_LOGD("path = %s", path);
707 C_LOGE("fopen failed");
708 return PC_OPERATION_SUCCESS;
711 while (fscanf(file, format_string, smack_subject, smack_object, smack_accesses) == 3) {
712 if (!strcmp(smack_subject, SMACK_APP_LABEL_TEMPLATE))
713 strcpy(smack_subject, app_label);
715 if (!strcmp(smack_object, SMACK_APP_LABEL_TEMPLATE))
716 strcpy(smack_object, app_label);
718 C_LOGD("smack_accesses_add_modify (subject: %s, object: %s, access: %s)", smack_subject, smack_object, smack_accesses);
719 if (smack_accesses_add_modify(smack, smack_subject, smack_object, smack_accesses, "") != 0) {
720 C_LOGE("smack_accesses_add_modify failed");
721 return PC_ERR_INVALID_OPERATION;
725 return PC_OPERATION_SUCCESS;
728 static int perm_to_dac(const char* app_label, app_type_t app_type, const char* perm)
730 C_LOGD("Enter function: %s", __func__);
732 char* path AUTO_FREE;
733 FILE* file AUTO_FCLOSE;
736 ret = perm_file_path(&path, app_type, perm, ".dac");
737 if (ret != PC_OPERATION_SUCCESS) {
738 C_LOGD("No dac config file for permission %s", perm);
742 file = fopen(path, "r");
743 C_LOGD("path = %s", path);
745 C_LOGE("fopen failed");
746 return PC_OPERATION_SUCCESS;
749 while (fscanf(file, "%d\n", &gid) == 1) {
750 C_LOGD("Adding app_id %s to group %d", app_label, gid);
751 ret = add_app_gid(app_label, gid);
752 if (ret != PC_OPERATION_SUCCESS) {
753 C_LOGE("sadd_app_gid failed");
758 return PC_OPERATION_SUCCESS;
761 static int label_all(const FTSENT* ftsent)
763 return DECISION_LABEL;
766 static int label_execs(const FTSENT* ftsent)
768 C_LOGD("Mode: %d", ftsent->fts_statp->st_mode);
769 // label only regular executable files
770 if (S_ISREG(ftsent->fts_statp->st_mode) && (ftsent->fts_statp->st_mode & S_IXUSR))
771 return DECISION_LABEL;
772 return DECISION_SKIP;
775 static int label_dirs(const FTSENT* ftsent)
777 // label only directories
778 if (S_ISDIR(ftsent->fts_statp->st_mode))
779 return DECISION_LABEL;
780 return DECISION_SKIP;
783 static int label_links_to_execs(const FTSENT* ftsent)
786 char* target AUTO_FREE;
788 // check if it's a link
789 if ( !S_ISLNK(ftsent->fts_statp->st_mode))
790 return DECISION_SKIP;
792 target = realpath(ftsent->fts_path, NULL);
794 C_LOGE("Getting link target for %s failed. Error %s", ftsent->fts_path, strerror(errno));
795 return PC_ERR_FILE_OPERATION;
797 if (-1 == stat(target, &buf)) {
798 C_LOGE("stat failed for %s, error: %s",target, strerror(errno));
799 return PC_ERR_FILE_OPERATION;
801 // skip if link target is not a regular executable file
802 if (buf.st_mode != (buf.st_mode | S_IXUSR | S_IFREG)) {
803 C_LOGD("%s Is not a regular executable file. Skipping.", target);
804 return DECISION_SKIP;
807 return DECISION_LABEL;
810 static int dir_set_smack_r(const char *path, const char* label,
811 enum smack_label_type type, label_decision_fn fn)
813 C_LOGD("Enter function: %s", __func__);
814 const char* path_argv[] = {path, NULL};
815 FTS *fts AUTO_FTS_CLOSE;
819 fts = fts_open((char * const *) path_argv, FTS_PHYSICAL | FTS_NOCHDIR, NULL);
821 C_LOGE("fts_open failed");
822 return PC_ERR_FILE_OPERATION;
825 while ((ftsent = fts_read(fts)) != NULL) {
826 /* Check for error (FTS_ERR) or failed stat(2) (FTS_NS) */
827 if (ftsent->fts_info == FTS_ERR || ftsent->fts_info == FTS_NS) {
828 C_LOGE("FTS_ERR error or failed stat(2) (FTS_NS)");
829 return PC_ERR_FILE_OPERATION;
837 if (ret == DECISION_LABEL) {
838 C_LOGD("smack_lsetlabel (label: %s (type: %d), path: %s)", label, type, ftsent->fts_path);
839 if (smack_lsetlabel(ftsent->fts_path, label, type) != 0) {
840 C_LOGE("smack_lsetlabel failed");
841 return PC_ERR_FILE_OPERATION;
846 /* If last call to fts_read() set errno, we need to return error. */
848 C_LOGE("Last errno: %s", strerror(errno));
849 return PC_ERR_FILE_OPERATION;
851 return PC_OPERATION_SUCCESS;
854 API char* app_id_from_socket(int sockfd)
856 C_LOGD("Enter function: %s", __func__);
863 ret = smack_new_label_from_socket(sockfd, &app_id);
865 C_LOGE("smack_new_label_from_socket failed");
869 C_LOGD("app_id: %s", app_id);
874 static int smack_file_name(const char* app_id, char** path)
876 if (asprintf(path, SMACK_RULES_DIR "/%s", app_id) == -1) {
877 C_LOGE("asprintf failed");
879 return PC_ERR_MEM_OPERATION;
882 return PC_OPERATION_SUCCESS;
885 static int load_smack_from_file(const char* app_id, struct smack_accesses** smack, int *fd, char** path)
887 C_LOGD("Enter function: %s", __func__);
890 ret = smack_file_name(app_id, path);
891 if (ret != PC_OPERATION_SUCCESS)
894 if (smack_accesses_new(smack)) {
895 C_LOGE("smack_accesses_new failed");
896 return PC_ERR_MEM_OPERATION;
899 *fd = open(*path, O_CREAT|O_RDWR, 0644);
901 C_LOGE("file open failed: %s", strerror(errno));
902 return PC_ERR_FILE_OPERATION;
905 if (flock(*fd, LOCK_EX)) {
906 C_LOGE("flock failed");
907 return PC_ERR_INVALID_OPERATION;
910 if (smack_accesses_add_from_file(*smack, *fd)) {
911 C_LOGE("smack_accesses_add_from_file failed");
912 return PC_ERR_INVALID_OPERATION;
915 /* Rewind the file */
916 if (lseek(*fd, 0, SEEK_SET) == -1) {
917 C_LOGE("lseek failed");
918 return PC_ERR_FILE_OPERATION;
921 return PC_OPERATION_SUCCESS;
925 * This function will check in database labels of all anti viruses
926 * and for all anti viruses will add a rule "anti_virus_label app_id rwx".
927 * This should be call in app_install function.
929 static int register_app_for_av(const char * app_id)
932 char** smack_label_av_list AUTO_FREE;
933 int smack_label_av_list_len = 0;
934 struct smack_accesses* smack AUTO_SMACK_FREE;
936 ret = smack_accesses_new(&smack);
937 if (ret != PC_OPERATION_SUCCESS) {
938 C_LOGE("smack_accesses_new failed");
942 // Reading labels of all installed anti viruses from "database"
943 ret = get_all_avs_ids(&smack_label_av_list, &smack_label_av_list_len);
944 if (ret != PC_OPERATION_SUCCESS) {
945 C_LOGE("Error while geting data from database");
949 // for each anti-virus put rule: "anti_virus_id app_id rwx"
950 for (i = 0; i < smack_label_av_list_len; ++i) {
952 char* smack_path AUTO_FREE;
953 C_LOGD("Adding rwx rule for antivirus: %s", smack_label_av_list[i]);
955 ret = load_smack_from_file(smack_label_av_list[i], &smack, &fd, &smack_path);
956 if (ret != PC_OPERATION_SUCCESS ) {
957 C_LOGE("load_smack_from_file failed");
961 if (smack_accesses_add(smack, smack_label_av_list[i], app_id, "wrx") == -1) {
962 C_LOGE("smack_accesses_add failed");
963 ret = PC_ERR_INVALID_OPERATION;
964 goto out; // Should we abort adding rules if once smack_accesses_add will fail?
967 if (have_smack() && smack_accesses_apply(smack)) {
968 C_LOGE("smack_accesses_apply failed");
969 ret = PC_ERR_INVALID_OPERATION;
973 if (smack_accesses_save(smack, fd)) {
974 C_LOGE("smack_accesses_save failed");
975 ret = PC_ERR_INVALID_OPERATION;
978 // Clearing char* smack_label_av_list[i] got from database.
979 free(smack_label_av_list[i]);
982 ret = PC_OPERATION_SUCCESS;
985 // If something failed, then no all char* smack_label_av_list[i]
986 // are deallocated. They must be freed
987 for(; i<smack_label_av_list_len; ++i) {
988 free(smack_label_av_list[i]);
994 static int app_add_permissions_internal(const char* app_id, app_type_t app_type, const char** perm_list, int permanent)
996 C_LOGD("Enter function: %s", __func__);
997 char* smack_path AUTO_FREE;
1000 struct smack_accesses *smack AUTO_SMACK_FREE;
1001 const char* base_perm = NULL;
1003 if (!smack_label_is_valid(app_id))
1004 return PC_ERR_INVALID_PARAM;
1006 ret = load_smack_from_file(app_id, &smack, &fd, &smack_path);
1007 if (ret != PC_OPERATION_SUCCESS) {
1008 C_LOGE("load_smack_from_file failed");
1012 /* Implicitly enable base permission for an app_type */
1013 base_perm = app_type_name(app_type);
1015 C_LOGD("perm_to_smack params: app_id: %s, %s", app_id, base_perm);
1016 ret = perm_to_smack(smack, app_id, APP_TYPE_OTHER, base_perm);
1017 if (ret != PC_OPERATION_SUCCESS){
1018 C_LOGE("perm_to_smack failed");
1022 for (i = 0; perm_list[i] != NULL; ++i) {
1023 C_LOGD("perm_to_smack params: app_id: %s, perm_list[%d]: %s", app_id, i, perm_list[i]);
1024 ret = perm_to_smack(smack, app_id, app_type, perm_list[i]);
1025 if (ret != PC_OPERATION_SUCCESS){
1026 C_LOGE("perm_to_smack failed");
1030 ret = perm_to_dac(app_id, app_type, perm_list[i]);
1031 if (ret != PC_OPERATION_SUCCESS){
1032 C_LOGE("perm_to_dac failed");
1037 if (have_smack() && smack_accesses_apply(smack)) {
1038 C_LOGE("smack_accesses_apply failed");
1039 return PC_ERR_INVALID_OPERATION;
1042 if (permanent && smack_accesses_save(smack, fd)) {
1043 C_LOGE("smack_accesses_save failed");
1044 return PC_ERR_INVALID_OPERATION;
1047 return PC_OPERATION_SUCCESS;
1050 API int app_add_permissions(const char* app_id, const char** perm_list)
1052 C_LOGD("Enter function: %s", __func__);
1053 return app_add_permissions_internal(app_id, APP_TYPE_OTHER, perm_list, 1);
1056 API int app_add_volatile_permissions(const char* app_id, const char** perm_list)
1058 C_LOGD("Enter function: %s", __func__);
1059 return app_add_permissions_internal(app_id, APP_TYPE_OTHER, perm_list, 0);
1062 API int app_enable_permissions(const char* app_id, app_type_t app_type, const char** perm_list, bool persistent)
1064 C_LOGD("Enter function: %s", __func__);
1065 return app_add_permissions_internal(app_id, app_type, perm_list, persistent);
1068 /* FIXME: this function is only a stub */
1069 API int app_disable_permissions(const char* app_id, app_type_t app_type, const char** perm_list)
1071 C_LOGD("Enter function: %s", __func__);
1072 return PC_OPERATION_SUCCESS;
1075 static int app_revoke_permissions_internal(const char* app_id, bool persistent)
1077 C_LOGD("Enter function: %s", __func__);
1078 char* smack_path AUTO_FREE;
1081 struct smack_accesses *smack AUTO_SMACK_FREE;
1083 if (!smack_label_is_valid(app_id))
1084 return PC_ERR_INVALID_PARAM;
1086 ret = load_smack_from_file(app_id, &smack, &fd, &smack_path);
1087 if (ret != PC_OPERATION_SUCCESS) {
1088 C_LOGE("load_smack_from_file failed");
1092 if (have_smack() && smack_accesses_clear(smack)) {
1093 ret = PC_ERR_INVALID_OPERATION;
1094 C_LOGE("smack_accesses_clear failed");
1098 if (have_smack() && smack_revoke_subject(app_id)) {
1099 ret = PC_ERR_INVALID_OPERATION;
1100 C_LOGE("smack_revoke_subject failed");
1104 if (persistent && ftruncate(fd, 0) == -1)
1105 C_LOGE("file truncate failed");
1107 return PC_OPERATION_SUCCESS;
1110 API int app_revoke_permissions(const char* app_id)
1112 C_LOGD("Enter function: %s", __func__);
1115 if (!smack_label_is_valid(app_id))
1116 return PC_ERR_INVALID_PARAM;
1118 ret = app_revoke_permissions_internal(app_id, true);
1120 C_LOGE("Revoking permissions failed");
1124 return PC_OPERATION_SUCCESS;
1127 API int app_reset_permissions(const char* app_id)
1129 C_LOGD("Enter function: %s", __func__);
1132 if (!smack_label_is_valid(app_id))
1133 return PC_ERR_INVALID_PARAM;
1135 ret = app_revoke_permissions_internal(app_id, false);
1137 C_LOGE("Revoking permissions failed");
1141 /* Add empty permissions set to trigger re-read of rules */
1142 return app_enable_permissions(app_id, APP_TYPE_OTHER, (const char*[]){NULL}, 0);
1145 API int app_label_dir(const char* label, const char* path)
1147 C_LOGD("Enter function: %s", __func__);
1149 int ret = PC_OPERATION_SUCCESS;
1151 if (!smack_label_is_valid(label))
1152 return PC_ERR_INVALID_PARAM;
1154 //setting access label on everything in given directory and below
1155 ret = dir_set_smack_r(path, label, SMACK_LABEL_ACCESS, &label_all);
1156 if (PC_OPERATION_SUCCESS != ret)
1159 //setting execute label for everything with permission to execute
1160 ret = dir_set_smack_r(path, label, SMACK_LABEL_EXEC, &label_execs);
1161 if (PC_OPERATION_SUCCESS != ret)
1164 //setting execute label for everything with permission to execute
1165 ret = dir_set_smack_r(path, label, SMACK_LABEL_EXEC, &label_links_to_execs);
1169 int smack_get_access_new(const char* subject, const char* object, char** label)
1171 char buff[ACC_LEN] = {'r', 'w', 'x', 'a', 't'};
1172 char perm[2] = {'-'};
1175 if(!smack_label_is_valid(subject) || !smack_label_is_valid(object) || !label)
1176 return PC_ERR_INVALID_PARAM;
1178 for (i=0; i<ACC_LEN; ++i) {
1180 int ret = smack_have_access(subject, object, perm);
1182 return PC_ERR_INVALID_OPERATION;
1187 *label = malloc(ACC_LEN+1);
1189 return PC_ERR_MEM_OPERATION;
1191 memcpy(*label, buff, ACC_LEN);
1192 (*label)[ACC_LEN] = 0;
1193 return PC_OPERATION_SUCCESS;
1197 * This function will be used to allow direct communication between 2 OSP application.
1198 * This function requires to store "state" with list of added label.
1200 * Full implementation requires some kind of database. This implemetation works without
1201 * database so you wont be able to revoke permissions added by different process.
1203 API int app_give_access(const char* subject, const char* object, const char* permissions)
1205 C_LOGD("Enter function: %s", __func__);
1206 int ret = PC_OPERATION_SUCCESS;
1207 struct smack_accesses *smack AUTO_SMACK_FREE;
1208 static const char * const revoke = "-----";
1209 char *current_permissions AUTO_FREE;
1212 return PC_OPERATION_SUCCESS;
1214 if (!smack_label_is_valid(subject) || !smack_label_is_valid(object))
1215 return PC_ERR_INVALID_PARAM;
1217 if (PC_OPERATION_SUCCESS != (ret = smack_get_access_new(subject, object, ¤t_permissions)))
1220 if (smack_accesses_new(&smack))
1221 return PC_ERR_MEM_OPERATION;
1223 if (smack_accesses_add_modify(smack, subject, object, permissions, revoke))
1224 return PC_ERR_MEM_OPERATION;
1226 if (smack_accesses_apply(smack))
1227 return PC_ERR_NOT_PERMITTED;
1229 ret = state_save(subject, object, current_permissions);
1235 * This function will be used to revoke direct communication between 2 OSP application.
1237 * Full implementation requires some kind of database. This implemetation works without
1238 * database so you wont be able to revoke permissions added by different process.
1240 API int app_revoke_access(const char* subject, const char* object)
1242 C_LOGD("Enter function: %s", __func__);
1244 return PC_OPERATION_SUCCESS;
1246 if (!smack_label_is_valid(subject) || !smack_label_is_valid(object))
1247 return PC_ERR_INVALID_PARAM;
1249 return state_restore(subject, object);
1252 API int app_label_shared_dir(const char* app_label, const char* shared_label, const char* path)
1254 C_LOGD("Enter function: %s", __func__);
1255 char* smack_path AUTO_FREE;
1258 struct smack_accesses *smack AUTO_SMACK_FREE;
1260 if (!smack_label_is_valid(app_label) || !smack_label_is_valid(shared_label))
1261 return PC_ERR_INVALID_PARAM;
1263 if (strcmp(app_label, shared_label) == 0) {
1264 C_LOGE("app_label equals shared_label");
1265 return PC_ERR_INVALID_PARAM;
1268 //setting label on everything in given directory and below
1269 ret = dir_set_smack_r(path, shared_label, SMACK_LABEL_ACCESS, label_all);
1270 if(ret != PC_OPERATION_SUCCESS){
1271 C_LOGE("dir_set_smakc_r failed");
1275 //setting transmute on dir
1276 ret = dir_set_smack_r(path, "1", SMACK_LABEL_TRANSMUTE, label_dirs);
1277 if (ret != PC_OPERATION_SUCCESS) {
1278 C_LOGE("dir_set_smakc_r failed");
1282 ret = load_smack_from_file(app_label, &smack, &fd, &smack_path);
1283 if (ret != PC_OPERATION_SUCCESS) {
1284 C_LOGE("load_smack_from_file failed");
1288 //setting access rule for application
1289 if (smack_accesses_add(smack, app_label,shared_label, "wrxat") == -1) {
1290 C_LOGE("smack_accesses_add failed");
1294 if (have_smack() && smack_accesses_apply(smack)) {
1295 C_LOGE("smack_accesses_apply failed");
1296 return PC_ERR_INVALID_OPERATION;
1299 if (smack_accesses_save(smack, fd)) {
1300 C_LOGE("smack_accesses_save failed");
1301 return PC_ERR_INVALID_OPERATION;
1304 return PC_OPERATION_SUCCESS;
1307 API int add_shared_dir_readers(const char* shared_label, const char** app_list)
1309 C_LOGD("Enter function: %s", __func__);
1310 int ret = PC_ERR_INVALID_PARAM;
1314 if (!smack_label_is_valid(shared_label))
1315 return PC_ERR_INVALID_PARAM;
1317 for (i = 0; app_list[i] != NULL; i++) {
1318 char *smack_path AUTO_FREE;
1319 struct smack_accesses *smack AUTO_SMACK_FREE;
1321 if (!smack_label_is_valid(app_list[i]))
1322 return PC_ERR_INVALID_PARAM;
1324 ret = load_smack_from_file(
1325 app_list[i], &smack, &fd, &smack_path);
1326 if (ret != PC_OPERATION_SUCCESS) {
1327 C_LOGE("load_smack_from_file failed");
1330 if (smack_accesses_add_modify(smack, app_list[i], shared_label,
1332 C_LOGE("smack_accesses_add failed");
1333 return PC_ERR_INVALID_OPERATION;
1335 if (have_smack() && smack_accesses_apply(smack)) {
1336 C_LOGE("smack_accesses_apply failed");
1337 return PC_ERR_INVALID_OPERATION;
1339 if (smack_accesses_save(smack, fd)) {
1340 C_LOGE("smack_accesses_save failed");
1341 return PC_ERR_INVALID_OPERATION;
1345 return PC_OPERATION_SUCCESS;
1348 API int app_add_friend(const char* app_id1, const char* app_id2)
1350 C_LOGD("Enter function: %s", __func__);
1354 char* smack_path1 AUTO_FREE;
1355 char* smack_path2 AUTO_FREE;
1356 struct smack_accesses* smack1 AUTO_SMACK_FREE;
1357 struct smack_accesses* smack2 AUTO_SMACK_FREE;
1359 if (!smack_label_is_valid(app_id1) || !smack_label_is_valid(app_id2))
1360 return PC_ERR_INVALID_PARAM;
1362 ret = load_smack_from_file(app_id1, &smack1, &fd1, &smack_path1);
1363 if (ret != PC_OPERATION_SUCCESS) {
1364 C_LOGE("load_smack_from_file failed");
1368 ret = load_smack_from_file(app_id2, &smack2, &fd2, &smack_path2);
1369 if (ret != PC_OPERATION_SUCCESS) {
1370 C_LOGE("load_smack_from_file failed");
1374 if (smack_accesses_add(smack1, app_id1, app_id2, "wrxat") == -1 ||
1375 (smack_accesses_add(smack2, app_id2, app_id1, "wrxat") == -1)) {
1376 C_LOGE("smack_accesses_add failed");
1381 (smack_accesses_apply(smack1) || smack_accesses_apply(smack2))) {
1382 C_LOGE("smack_accesses_apply failed");
1383 return PC_ERR_INVALID_OPERATION;
1386 if (smack_accesses_save(smack1, fd1) || smack_accesses_save(smack2, fd2)) {
1387 C_LOGE("smack_accesses_save failed");
1388 return PC_ERR_INVALID_OPERATION;
1391 return PC_OPERATION_SUCCESS;
1394 API int app_install(const char* app_id)
1396 C_LOGD("Enter function: %s", __func__);
1399 char* smack_path AUTO_FREE;
1401 if (!smack_label_is_valid(app_id))
1402 return PC_ERR_INVALID_PARAM;
1404 ret = smack_file_name(app_id, &smack_path);
1405 if (ret != PC_OPERATION_SUCCESS)
1408 fd = open(smack_path, O_RDWR|O_CREAT, 0644);
1410 C_LOGE("file open failed: %s", strerror(errno));
1411 return PC_ERR_FILE_OPERATION;
1414 ret = add_app_id_to_databse(app_id);
1415 if (ret != PC_OPERATION_SUCCESS ) {
1416 C_LOGE("Error while adding app %s to database: %s ", app_id, strerror(errno));
1420 ret = register_app_for_av(app_id);
1421 if (ret != PC_OPERATION_SUCCESS) {
1422 C_LOGE("Error while adding rules for anti viruses to app %s: %s ", app_id, strerror(errno));
1426 return PC_OPERATION_SUCCESS;
1429 API int app_uninstall(const char* app_id)
1431 // TODO: When real database will be used, then this function should remove app_id
1433 // It also should remove rules looks like: "anti_virus_label app_id rwx".
1434 C_LOGD("Enter function: %s", __func__);
1435 char* smack_path AUTO_FREE;
1438 if (!smack_label_is_valid(app_id))
1439 return PC_ERR_INVALID_PARAM;
1441 ret = smack_file_name(app_id, &smack_path);
1442 if (ret != PC_OPERATION_SUCCESS)
1445 if (unlink(smack_path)) {
1446 C_LOGE("unlink failed: ", strerror(errno));
1447 return PC_OPERATION_SUCCESS;
1450 return PC_OPERATION_SUCCESS;
1453 static int save_rules(int fd, struct smack_accesses* accesses) {
1454 if (flock(fd, LOCK_EX)) {
1455 C_LOGE("flock failed, error %s", strerror(errno));
1456 return PC_ERR_FILE_OPERATION;
1459 if (smack_accesses_save(accesses, fd)) {
1460 C_LOGE("smack_accesses_save failed");
1461 return PC_ERR_FILE_OPERATION;
1463 return PC_OPERATION_SUCCESS ;
1466 static int validate_and_add_rule(char* rule, struct smack_accesses* accesses) {
1467 const char* subject = NULL;
1468 const char* object = NULL;
1469 const char* access = NULL;
1470 char* saveptr = NULL;
1472 subject = strtok_r(rule, " \t\n", &saveptr);
1473 object = strtok_r(NULL, " \t\n", &saveptr);
1474 access = strtok_r(NULL, " \t\n", &saveptr);
1476 // check rule validity
1477 if (subject == NULL ||
1480 strtok_r(NULL, " \t\n", &saveptr) != NULL ||
1481 !smack_label_is_valid(subject) ||
1482 !smack_label_is_valid(object))
1484 C_LOGE("Incorrect rule format: %s", rule);
1485 return PC_ERR_INVALID_PARAM;
1488 if (smack_accesses_add(accesses, subject, object, access)) {
1489 C_LOGE("smack_accesses_add failed");
1490 return PC_ERR_INVALID_OPERATION;
1492 return PC_OPERATION_SUCCESS ;
1495 static int parse_and_save_rules(const char** smack_rules,
1496 struct smack_accesses* accesses, const char* feature_file) {
1499 int ret = PC_OPERATION_SUCCESS;
1502 for (i = 0; smack_rules[i] != NULL ; i++) {
1503 // ignore empty lines
1504 if (strspn(smack_rules[i], " \t\n") == strlen(smack_rules[i]))
1507 tmp = strdup(smack_rules[i]);
1508 ret = validate_and_add_rule(tmp, accesses);
1510 if (ret != PC_OPERATION_SUCCESS )
1515 fd = open(feature_file, O_CREAT | O_WRONLY, 0644);
1517 C_LOGE("Unable to create file %s. Error: %s", feature_file, strerror(errno));
1518 return PC_ERR_FILE_OPERATION;
1521 ret = save_rules(fd, accesses);
1526 static int save_gids(FILE* file, const gid_t* list_of_db_gids, size_t list_size) {
1527 int ret = PC_OPERATION_SUCCESS;
1532 C_LOGE("Unable to create file. Error: %s", strerror(errno));
1533 return PC_ERR_FILE_OPERATION; // TODO remove smack accesses?
1536 if(-1 == fchmod(fileno(file), 0644)) {
1537 C_LOGE("Unable to chmod file. Error: %s", strerror(errno));
1538 return PC_ERR_FILE_OPERATION;
1541 for (i = 0; i < list_size ; ++i) {
1542 written = fprintf(file, "%u\n", list_of_db_gids[i]);
1544 C_LOGE("fprintf failed for file. Error: %s", strerror(errno));
1545 ret = PC_ERR_FILE_OPERATION;
1552 API int add_api_feature(app_type_t app_type,
1553 const char* api_feature_name,
1554 const char** smack_rules,
1555 const gid_t* list_of_db_gids,
1557 C_LOGD("Enter function: %s", __func__);
1559 int ret = PC_OPERATION_SUCCESS;
1560 char* smack_file AUTO_FREE;
1561 char* dac_file AUTO_FREE;
1562 struct smack_accesses* accesses = NULL;
1565 // TODO check process capabilities
1567 // get feature SMACK file name
1568 ret = perm_file_path(&smack_file, app_type, api_feature_name, ".smack");
1569 if (ret != PC_OPERATION_SUCCESS || !smack_file ) {
1573 // check if feature exists
1574 if (file_exists(smack_file)) {
1575 C_LOGE("Feature file %s already exists", smack_file);
1576 return PC_ERR_INVALID_PARAM;
1579 // check .dac existence only if gids are supported
1580 if (list_of_db_gids && list_size > 0) {
1581 // get feature DAC file name
1582 ret = perm_file_path(&dac_file, app_type, api_feature_name, ".dac");
1583 if (ret != PC_OPERATION_SUCCESS || !dac_file ) {
1587 // check if feature exists
1588 if (file_exists(dac_file)) {
1589 C_LOGE("Feature file %s already exists", dac_file);
1590 return PC_ERR_INVALID_PARAM;
1594 // parse & save rules
1596 if (smack_accesses_new(&accesses)) {
1597 C_LOGE("smack_acceses_new failed");
1598 return PC_ERR_MEM_OPERATION;
1601 ret = parse_and_save_rules(smack_rules, accesses, smack_file);
1602 smack_accesses_free(accesses);
1605 // go through gid list
1606 if (ret == PC_OPERATION_SUCCESS && list_of_db_gids && list_size > 0) {
1608 file = fopen(dac_file, "w+");
1609 ret = save_gids(file, list_of_db_gids, list_size);
1613 // remove both files in case of failure
1614 if (ret != PC_OPERATION_SUCCESS) {
1622 API int app_register_av(const char* app_av_id)
1624 C_LOGD("Enter function: %s", __func__);
1628 FILE* file AUTO_FCLOSE;
1630 char** smack_label_app_list AUTO_FREE;
1631 int smack_label_app_list_len = 0;
1632 char* smack_path AUTO_FREE;
1633 struct smack_accesses* smack AUTO_SMACK_FREE;
1635 if (!smack_label_is_valid(app_av_id))
1636 return PC_ERR_INVALID_PARAM;
1638 ret = smack_accesses_new(&smack);
1639 if (ret != PC_OPERATION_SUCCESS) {
1640 C_LOGE("smack_accesses_new failed");
1641 return PC_ERR_MEM_OPERATION;
1644 // writing anti_virus_id (app_av_id) to "database"
1645 ret = add_av_id_to_databse(app_av_id);
1646 if (ret != PC_OPERATION_SUCCESS)
1649 ret = load_smack_from_file(app_av_id, &smack, &fd, &smack_path);
1650 if (ret != PC_OPERATION_SUCCESS) {
1651 C_LOGE("load_smack_from_file failed");
1655 // Reading labels of all installed apps from "database"
1656 ret = get_all_apps_ids(&smack_label_app_list, &smack_label_app_list_len);
1657 if (ret != PC_OPERATION_SUCCESS) {
1658 C_LOGE("Error while geting data from database");
1661 for (i=0; i<smack_label_app_list_len; ++i) {
1662 C_LOGD("Applying rwx rule for %s", smack_label_app_list[i]);
1663 if (smack_accesses_add(smack, app_av_id, smack_label_app_list[i], "wrx") == -1) {
1664 C_LOGE("smack_accesses_add failed");
1665 ret = PC_ERR_INVALID_OPERATION;
1666 goto out; // Should we abort adding rules if once smack_accesses_add will fail?
1670 // Add permisions from OSP_antivirus.samck file - only the OSP app can be an Anti Virus
1671 ret = perm_to_smack(smack, app_av_id, APP_TYPE_OSP, SMACK_ANTIVIRUS_PERM);
1672 if (PC_OPERATION_SUCCESS != ret) {
1673 C_LOGE("perm_to_smack failed");
1677 if (have_smack() && smack_accesses_apply(smack)) {
1678 C_LOGE("smack_accesses_apply failed");
1679 ret = PC_ERR_INVALID_OPERATION;
1683 if (smack_accesses_save(smack, fd)) {
1684 C_LOGE("smack_accesses_save failed");
1685 ret = PC_ERR_INVALID_OPERATION;
1690 for (i=0; i<smack_label_app_list_len; ++i) {
1691 free(smack_label_app_list[i]);
1694 return PC_OPERATION_SUCCESS;