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Switch to DB based su config

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This commit is contained in:
topjohnwu 2017-06-01 03:19:45 +08:00
parent 48ace3de57
commit 1ddd746862
5 changed files with 93 additions and 80 deletions
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4
activity.c
View File

@ -40,7 +40,7 @@ static void silent_run(char* const args[]) {
}
static int setup_user(struct su_context *ctx, char* user) {
switch (ctx->user.multiuser_mode) {
switch (ctx->info->multiuser_mode) {
case MULTIUSER_MODE_OWNER_ONLY: /* Should already be denied if not owner */
case MULTIUSER_MODE_OWNER_MANAGED:
sprintf(user, "%d", 0);
@ -60,7 +60,7 @@ void app_send_result(struct su_context *ctx, policy_t policy) {
sprintf(toUid, "%d", ctx->to.uid);
char pid[16];
sprintf(pid, "%d", ctx->info->pid);
sprintf(pid, "%d", ctx->pid);
char user[16];
int notify = setup_user(ctx, user);

70
db.c
View File

@ -1,4 +1,5 @@
/*
** Copyright 2017, John Wu (@topjohnwu)
** Copyright 2013, Koushik Dutta (@koush)
**
*/
@ -14,20 +15,15 @@
#include "magisk.h"
#include "su.h"
static int database_callback(void *v, int argc, char **argv, char **azColName) {
static int policy_callback(void *v, int argc, char **argv, char **azColName) {
struct su_context *ctx = (struct su_context *) v;
policy_t policy = QUERY;
time_t until = 0;
for(int i = 0; i < argc; i++) {
if (strcmp(azColName[i], "policy") == 0) {
if (argv[i] != NULL) {
policy = atoi(argv[i]);
}
} else if (strcmp(azColName[i], "until") == 0) {
if (argv[i] != NULL) {
until = atol(argv[i]);
}
}
for (int i = 0; i < argc; i++) {
if (strcmp(azColName[i], "policy") == 0)
policy = atoi(argv[i]);
else if (strcmp(azColName[i], "until") == 0)
until = atol(argv[i]);
}
if (policy == DENY)
@ -35,18 +31,44 @@ static int database_callback(void *v, int argc, char **argv, char **azColName) {
else if (policy == ALLOW && (until == 0 || until > time(NULL)))
ctx->info->policy = ALLOW;
LOGD("su_db: query policy=[%d]\n", ctx->info->policy);
return 0;
}
static int settings_callback(void *v, int argc, char **argv, char **azColName) {
struct su_context *ctx = (struct su_context *) v;
int *target, value;
char *entry;
for (int i = 0; i < argc; ++i) {
if (strcmp(azColName[i], "key") == 0) {
if (strcmp(argv[i], ROOT_ACCESS_ENTRY) == 0)
target = &ctx->info->root_access;
else if (strcmp(argv[i], MULTIUSER_MODE_ENTRY) == 0)
target = &ctx->info->multiuser_mode;
entry = argv[i];
} else if (strcmp(azColName[i], "value") == 0) {
value = atoi(argv[i]);
}
}
LOGD("su_db: query %s=[%d]\n", entry, value);
*target = value;
return 0;
}
void database_check(struct su_context *ctx) {
sqlite3 *db = NULL;
// Set default values
ctx->info->root_access = ROOT_ACCESS_APPS_AND_ADB;
ctx->info->multiuser_mode = MULTIUSER_MODE_OWNER_ONLY;
ctx->info->policy = QUERY;
// Check if file is readable
if (access(ctx->user.database_path, R_OK) == -1)
return;
char query[512];
snprintf(query, sizeof(query), "SELECT policy, until FROM policies WHERE uid=%d", ctx->info->uid % 100000);
// Open database
int ret = sqlite3_open_v2(ctx->user.database_path, &db, SQLITE_OPEN_READONLY, NULL);
if (ret) {
LOGD("sqlite3 open failure: %s\n", sqlite3_errstr(ret));
@ -54,11 +76,21 @@ void database_check(struct su_context *ctx) {
return;
}
char *err = NULL;
ret = sqlite3_exec(db, query, database_callback, ctx, &err);
sqlite3_close(db);
if (err != NULL) {
char query[512], *err = NULL;
// Query for policy
snprintf(query, sizeof(query), "SELECT policy, until FROM policies WHERE uid=%d", ctx->info->uid % 100000);
sqlite3_exec(db, query, policy_callback, ctx, &err);
if (err != NULL)
LOGE("sqlite3_exec: %s\n", err);
ctx->info->policy = DENY;
}
err = NULL;
// Query for settings
snprintf(query, sizeof(query), "SELECT key, value FROM settings");
sqlite3_exec(db, query, settings_callback, ctx, &err);
if (err != NULL)
LOGE("sqlite3_exec: %s\n", err);
sqlite3_close(db);
}

46
su.c
View File

@ -237,7 +237,7 @@ int su_daemon_main(int argc, char **argv) {
printf("%s\n", MAGISKSU_VER_STR);
exit2(EXIT_SUCCESS);
case 'u':
switch (su_ctx->user.multiuser_mode) {
switch (su_ctx->info->multiuser_mode) {
case MULTIUSER_MODE_USER:
printf("Owner only: Only owner has root access\n");
break;
@ -293,34 +293,26 @@ int su_daemon_main(int argc, char **argv) {
// Setup done, now every error leads to deny
err_handler = deny;
// Check property of root configuration
char *root_prop = getprop(ROOT_ACCESS_PROP);
if (root_prop) {
int prop_status = atoi(root_prop);
switch (prop_status) {
case ROOT_ACCESS_DISABLED:
LOGE("Root access is disabled!\n");
// Check root_access configuration
switch (su_ctx->info->root_access) {
case ROOT_ACCESS_DISABLED:
LOGE("Root access is disabled!\n");
exit(EXIT_FAILURE);
case ROOT_ACCESS_APPS_ONLY:
if (su_ctx->info->uid == UID_SHELL) {
LOGE("Root access is disabled for ADB!\n");
exit(EXIT_FAILURE);
case ROOT_ACCESS_APPS_ONLY:
if (su_ctx->info->uid == UID_SHELL) {
LOGE("Root access is disabled for ADB!\n");
exit(EXIT_FAILURE);
}
break;
case ROOT_ACCESS_ADB_ONLY:
if (su_ctx->info->uid != UID_SHELL) {
LOGE("Root access limited to ADB only!\n");
exit(EXIT_FAILURE);
}
break;
case ROOT_ACCESS_APPS_AND_ADB:
default:
break;
}
free(root_prop);
} else {
// Not initialized yet, set the prop to allow everything by default
setprop(ROOT_ACCESS_PROP, xstr(ROOT_ACCESS_APPS_AND_ADB));
break;
case ROOT_ACCESS_ADB_ONLY:
if (su_ctx->info->uid != UID_SHELL) {
LOGE("Root access limited to ADB only!\n");
exit(EXIT_FAILURE);
}
break;
case ROOT_ACCESS_APPS_AND_ADB:
default:
break;
}
// New request or no db exist, notify user for response

14
su.h
View File

@ -12,14 +12,14 @@
#define MAGISKSU_VER_STR xstr(MAGISK_VERSION) ":MAGISKSU (topjohnwu)"
// Property check for root access
#define ROOT_ACCESS_PROP "persist.magisk.root"
#define ROOT_ACCESS_ENTRY "root_access"
#define ROOT_ACCESS_DISABLED 0
#define ROOT_ACCESS_APPS_ONLY 1
#define ROOT_ACCESS_ADB_ONLY 2
#define ROOT_ACCESS_APPS_AND_ADB 3
// Property for multiuser
#define MULTIUSER_MODE_PROP "persist.magisk.multiuser"
#define MULTIUSER_MODE_ENTRY "multiuser_mode"
#define MULTIUSER_MODE_OWNER_ONLY 0
#define MULTIUSER_MODE_OWNER_MANAGED 1
#define MULTIUSER_MODE_USER 2
@ -51,13 +51,14 @@ typedef enum {
ALLOW = 2,
} policy_t;
struct su_initiator {
pid_t pid;
struct su_info {
unsigned uid;
policy_t policy;
pthread_mutex_t lock;
int count;
int clock;
int multiuser_mode;
int root_access;
struct list_head pos;
};
@ -75,8 +76,6 @@ struct su_user_info {
// the user in android userspace (multiuser)
// that invoked this action.
unsigned android_user_id;
// how su behaves with multiuser. see enum below.
int multiuser_mode;
// path to superuser directory. this is populated according
// to the multiuser mode.
// this is used to check uid/gid for protecting socket.
@ -89,9 +88,10 @@ struct su_user_info {
};
struct su_context {
struct su_initiator *info;
struct su_info *info;
struct su_request to;
struct su_user_info user;
pid_t pid;
int notify;
mode_t umask;
char sock_path[PATH_MAX];

37
su_daemon.c
View File

@ -63,27 +63,16 @@ static void sigpipe_handler(int sig) {
LOGD("su: Client killed unexpectedly\n");
}
static int get_multiuser_mode() {
char *prop = getprop(MULTIUSER_MODE_PROP);
if (prop) {
int ret = atoi(prop);
free(prop);
return ret;
}
return MULTIUSER_MODE_OWNER_ONLY;
}
// Maintain the lists periodically
static void *collector(void *args) {
LOGD("su: collector started\n");
struct list_head *pos, *temp;
struct su_initiator *node;
struct su_info *node;
while(1) {
sleep(1);
pthread_mutex_lock(&list_lock);
list_for_each(pos, &active_list) {
node = list_entry(pos, struct su_initiator, pos);
node = list_entry(pos, struct su_info, pos);
--node->clock;
// Timeout, move to waiting list
if (node->clock == 0) {
@ -94,7 +83,7 @@ static void *collector(void *args) {
}
}
list_for_each(pos, &waiting_list) {
node = list_entry(pos, struct su_initiator, pos);
node = list_entry(pos, struct su_info, pos);
// Nothing is using the info, remove it
if (node->count == 0) {
temp = pos;
@ -111,7 +100,7 @@ static void *collector(void *args) {
void su_daemon_receiver(int client) {
LOGD("su: request from client: %d\n", client);
struct su_initiator *info = NULL, *node;
struct su_info *info = NULL, *node;
struct list_head *pos;
int new_request = 0;
@ -129,7 +118,7 @@ void su_daemon_receiver(int client) {
// Search for existing in the active list
list_for_each(pos, &active_list) {
node = list_entry(pos, struct su_initiator, pos);
node = list_entry(pos, struct su_info, pos);
if (node->uid == credential.uid)
info = node;
}
@ -154,8 +143,6 @@ void su_daemon_receiver(int client) {
// Lock before the policy is determined
pthread_mutex_lock(&info->lock);
info->pid = credential.pid;
// Default values
struct su_context ctx = {
.info = info,
@ -168,8 +155,8 @@ void su_daemon_receiver(int client) {
},
.user = {
.android_user_id = info->uid / 100000,
.multiuser_mode = get_multiuser_mode(),
},
.pid = credential.pid,
.umask = 022,
.notify = new_request,
};
@ -191,8 +178,12 @@ void su_daemon_receiver(int client) {
// Not cached, do the checks
if (info->policy == QUERY) {
// Get data from database
database_check(su_ctx);
// Handle multiuser denies
if (su_ctx->user.android_user_id &&
su_ctx->user.multiuser_mode == MULTIUSER_MODE_OWNER_ONLY) {
su_ctx->info->multiuser_mode == MULTIUSER_MODE_OWNER_ONLY) {
info->policy = DENY;
su_ctx->notify = 0;
}
@ -200,19 +191,17 @@ void su_daemon_receiver(int client) {
// always allow if this is Magisk Manager
if (info->policy == QUERY && (info->uid % 100000) == (st.st_uid % 100000)) {
info->policy = ALLOW;
info->root_access = ROOT_ACCESS_APPS_AND_ADB;
su_ctx->notify = 0;
}
// always allow if it's root
if (info->uid == UID_ROOT) {
info->policy = ALLOW;
info->root_access = ROOT_ACCESS_APPS_AND_ADB;
su_ctx->notify = 0;
}
// If not determined, check database
if (info->policy == QUERY)
database_check(su_ctx);
// If still not determined, open a pipe and wait for results
if (info->policy == QUERY)
pipe2(pipefd, O_CLOEXEC);