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Use generic isSelector am: 3d85f1e116

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Original change: https://android-review.googlesource.com/c/platform/external/selinux/+/2839485

Change-Id: I0aad333ba1526c0a61ea2d55c528b1e7373897e7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Thiébaud Weksteen 2023-12-01 03:19:18 +00:00 committed by Automerger Merge Worker
commit bce1d3689b
3 changed files with 144 additions and 153 deletions
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9
libselinux/src/android/android_internal.h
View file

@ -105,14 +105,7 @@ int seapp_context_reload_internal(const path_alts_t *context_paths);
/* A parsed seinfo */
struct parsed_seinfo {
char base[SEINFO_BUFSIZ];
#define IS_PRIV_APP (1 << 0)
#define IS_FROM_RUN_AS (1 << 1)
#define IS_EPHEMERAL_APP (1 << 2)
#define IS_ISOLATED_COMPUTE_APP (1 << 3)
#define IS_SDK_SANDBOX_AUDIT (1 << 4)
#define IS_SDK_SANDBOX_NEXT (1 << 5)
int32_t is;
bool isPreinstalledApp;
char isSelector[SEINFO_BUFSIZ];
char partition[SEINFO_BUFSIZ];
int32_t targetSdkVersion;
};

197
libselinux/src/android/android_seapp.c
View file

@ -128,18 +128,14 @@ static void free_prefix_str(struct prefix_str *p)
struct seapp_context {
/* input selectors */
bool isSystemServer;
bool isEphemeralAppSet;
bool isEphemeralApp;
struct prefix_str user;
char *seinfo;
struct prefix_str name;
bool isPrivAppSet;
bool isPrivApp;
int32_t minTargetSdkVersion;
bool fromRunAs;
bool isIsolatedComputeApp;
bool isSdkSandboxAudit;
bool isSdkSandboxNext;
/* name of a boolean selector such as isPrivApp, fromRunAs,
* isIsolatedComputeApp, etc. */
char *isSelector;
bool isSelectorValue;
/* outputs */
char *domain;
char *type;
@ -153,6 +149,7 @@ static void free_seapp_context(struct seapp_context *s)
if (!s)
return;
free(s->isSelector);
free_prefix_str(&s->user);
free(s->seinfo);
free_prefix_str(&s->name);
@ -181,11 +178,6 @@ static int seapp_context_cmp(const void *A, const void *B)
if (s1->isSystemServer != s2->isSystemServer)
return (s1->isSystemServer ? -1 : 1);
/* Give precedence to a specified isEphemeral= over an
* unspecified isEphemeral=. */
if (s1->isEphemeralAppSet != s2->isEphemeralAppSet)
return (s1->isEphemeralAppSet ? -1 : 1);
/* Give precedence to a specified user= over an unspecified user=. */
if (s1->user.str && !s2->user.str)
return -1;
@ -224,9 +216,12 @@ static int seapp_context_cmp(const void *A, const void *B)
return (s1->name.len > s2->name.len) ? -1 : 1;
}
/* Give precedence to a specified isPrivApp= over an unspecified isPrivApp=. */
if (s1->isPrivAppSet != s2->isPrivAppSet)
return (s1->isPrivAppSet ? -1 : 1);
/* Give precedence to a specified isSelector (e.g., isPrivApp)
* over an unspecified isSelector. */
if(s1->isSelector && !s2->isSelector)
return -1;
if(!s1->isSelector && s2->isSelector)
return 1;
/* Give precedence to a higher minTargetSdkVersion= over a lower minTargetSdkVersion=.
* If unspecified, minTargetSdkVersion has a default value of 0.
@ -236,10 +231,6 @@ static int seapp_context_cmp(const void *A, const void *B)
else if (s1->minTargetSdkVersion < s2->minTargetSdkVersion)
return 1;
/* Give precedence to fromRunAs=true. */
if (s1->fromRunAs != s2->fromRunAs)
return (s1->fromRunAs ? -1 : 1);
/* Give precedence to platform side contexts */
bool isS1Platform = is_platform(s1->partition);
bool isS2Platform = is_platform(s2->partition);
@ -375,16 +366,6 @@ int seapp_context_reload_internal(const path_alts_t *context_paths)
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "isEphemeralApp")) {
cur->isEphemeralAppSet = true;
if (!strcasecmp(value, "true"))
cur->isEphemeralApp = true;
else if (!strcasecmp(value, "false"))
cur->isEphemeralApp = false;
else {
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "user")) {
if (cur->user.str) {
free_seapp_context(cur);
@ -485,55 +466,30 @@ int seapp_context_reload_internal(const path_alts_t *context_paths)
free_seapp_context(cur);
goto oom;
}
} else if (!strcasecmp(name, "isPrivApp")) {
cur->isPrivAppSet = true;
if (!strcasecmp(value, "true"))
cur->isPrivApp = true;
else if (!strcasecmp(value, "false"))
cur->isPrivApp = false;
else {
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "minTargetSdkVersion")) {
cur->minTargetSdkVersion = get_minTargetSdkVersion(value);
if (cur->minTargetSdkVersion < 0) {
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "fromRunAs")) {
if (!strcasecmp(value, "true"))
cur->fromRunAs = true;
else if (!strcasecmp(value, "false"))
cur->fromRunAs = false;
else {
} else if ((!strncasecmp(name, "is", 2) && strlen(name) > 3) ||
!strcasecmp(name, "fromRunAs")) {
if (cur->isSelector) {
selinux_log(SELINUX_ERROR, "%s: isSelector set twice %s",
__FUNCTION__, name);
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "isIsolatedComputeApp")) {
if (!strcasecmp(value, "true"))
cur->isIsolatedComputeApp = true;
else if (!strcasecmp(value, "false"))
cur->isIsolatedComputeApp = false;
else {
cur->isSelector = strdup(name);
if (!cur->isSelector) {
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "isSdkSandboxAudit")) {
if (!strcasecmp(value, "true"))
cur->isSdkSandboxAudit = true;
else if (!strcasecmp(value, "false"))
cur->isSdkSandboxAudit = false;
else {
free_seapp_context(cur);
goto err;
}
} else if (!strcasecmp(name, "isSdkSandboxNext")) {
if (!strcasecmp(value, "true"))
cur->isSdkSandboxNext = true;
else if (!strcasecmp(value, "false"))
cur->isSdkSandboxNext = false;
else {
if (!strcasecmp(value, "true")) {
cur->isSelectorValue = true;
} else if (!strcasecmp(value, "false")) {
cur->isSelectorValue = false;
} else {
free_seapp_context(cur);
goto err;
}
@ -547,7 +503,8 @@ int seapp_context_reload_internal(const path_alts_t *context_paths)
break;
}
if (!cur->isPrivApp && cur->name.str &&
if ((!cur->isSelector || strcasecmp(cur->isSelector, "isPrivApp") || !cur->isSelectorValue) &&
cur->name.str &&
(!cur->seinfo || !strcmp(cur->seinfo, "default"))) {
selinux_log(SELINUX_ERROR, "%s: No specific seinfo value specified with name=\"%s\", on line %u: insecure configuration!\n",
seapp_contexts_files[i], cur->name.str, lineno);
@ -582,11 +539,8 @@ int seapp_context_reload_internal(const path_alts_t *context_paths)
bool dup = (!s1->user.str || !strcmp(s1->user.str, s2->user.str)) &&
(!s1->seinfo || !strcmp(s1->seinfo, s2->seinfo)) &&
(!s1->name.str || !strcmp(s1->name.str, s2->name.str)) &&
(!s1->isPrivAppSet || s1->isPrivApp == s2->isPrivApp) &&
(!s1->isEphemeralAppSet || s1->isEphemeralApp == s2->isEphemeralApp) &&
(s1->isIsolatedComputeApp == s2->isIsolatedComputeApp) &&
(s1->isSdkSandboxAudit == s2->isSdkSandboxAudit) &&
(s1->isSdkSandboxNext == s2->isSdkSandboxNext);
(!s1->isSelector || !strcmp(s1->isSelector, s2->isSelector)) &&
(s1->isSelectorValue == s2->isSelectorValue);
if (dup) {
selinux_log(SELINUX_ERROR, "seapp_contexts: Duplicated entry\n");
@ -608,27 +562,21 @@ int seapp_context_reload_internal(const path_alts_t *context_paths)
int i;
for (i = 0; i < nspec; i++) {
cur = seapp_contexts[i];
selinux_log(SELINUX_INFO, "%s: isSystemServer=%s isEphemeralApp=%s "
"isIsolatedComputeApp=%s isSdkSandboxAudit=%s isSdkSandboxNext=%s "
"user=%s seinfo=%s name=%s isPrivApp=%s minTargetSdkVersion=%d "
"fromRunAs=%s -> domain=%s type=%s level=%s levelFrom=%s",
selinux_log(SELINUX_INFO, "%s: isSystemServer=%s %s=%s "
"user=%s seinfo=%s name=%s minTargetSdkVersion=%d "
" -> domain=%s type=%s level=%s levelFrom=%s",
__FUNCTION__,
cur->isSystemServer ? "true" : "false",
cur->isEphemeralAppSet ? (cur->isEphemeralApp ? "true" : "false") : "null",
cur->isSelector ? cur->isSelector : "isX",
cur->isSelector ? (cur->isSelectorValue ? "true" : "false") : "null",
cur->user.str,
cur->seinfo, cur->name.str,
cur->isPrivAppSet ? (cur->isPrivApp ? "true" : "false") : "null",
cur->minTargetSdkVersion,
cur->fromRunAs ? "true" : "false",
cur->isIsolatedComputeApp ? "true" : "false",
cur->isSdkSandboxAudit ? "true" : "false",
cur->isSdkSandboxNext ? "true" : "false",
cur->domain, cur->type, cur->level,
levelFromName[cur->levelFrom]);
}
}
#endif
ret = 0;
out:
@ -675,16 +623,21 @@ void selinux_android_seapp_context_init(void) {
*/
#define CAT_MAPPING_MAX_ID (0x1<<16)
#define PRIVILEGED_APP_STR "privapp"
#define ISOLATED_COMPUTE_APP_STR "isolatedComputeApp"
#define APPLY_SDK_SANDBOX_AUDIT_RESTRICTIONS_STR "isSdkSandboxAudit"
#define APPLY_SDK_SANDBOX_NEXT_RESTRICTIONS_STR "isSdkSandboxNext"
#define EPHEMERAL_APP_STR "ephemeralapp"
#define TARGETSDKVERSION_STR "targetSdkVersion"
#define PARTITION_STR "partition"
#define FROM_RUNAS_STR "fromRunAs"
#define COMPLETE_STR "complete"
/* Any selector from seapp_contexts starting with "is" is automatically mapped
* to an attribute of seinfo. For historical reasons, there are mappings that do
* not follow this convention. */
static char* selector_mappings[][2] = {
/* seinfo field, seapp_contexts selector */
{"privapp", "isPrivApp"},
{"isolatedComputeApp", "isIsolatedComputeApp"},
{"ephemeralapp", "isEphemeralApp"},
{"fromRunAs", "fromRunAs"}
};
static bool is_preinstalled_app_partition_valid(const char *app_policy, const char *app_partition) {
// We forbid system/system_ext/product installed apps from being labeled with vendor sepolicy.
// So, either the app shouldn't be platform, or the spec should be platform.
@ -725,6 +678,8 @@ int set_range_from_level(context_t ctx, enum levelFrom levelFrom, uid_t userid,
return 0;
}
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
int parse_seinfo(const char* seinfo, struct parsed_seinfo* info) {
char local_seinfo[SEINFO_BUFSIZ];
@ -747,28 +702,29 @@ int parse_seinfo(const char* seinfo, struct parsed_seinfo* info) {
first = false;
continue;
}
if (!strcmp(token, PRIVILEGED_APP_STR)) {
info->is |= IS_PRIV_APP;
bool matched = false;
for (int i=0; i < ARRAY_SIZE(selector_mappings); i++) {
if (!strcmp(token, selector_mappings[i][0])) {
if(info->isSelector[0]) {
selinux_log(SELINUX_ERROR, "%s: isSelector already populated: %s in %s\n",
__FUNCTION__, token, seinfo);
return -1;
}
strcpy(info->isSelector, selector_mappings[i][1]);
matched = true;
break;
}
}
if (matched) {
continue;
}
if (!strcmp(token, EPHEMERAL_APP_STR)) {
info->is |= IS_EPHEMERAL_APP;
continue;
if (!strncmp(token, "is", 2)) {
if(info->isSelector[0]) {
selinux_log(SELINUX_ERROR, "%s: isSelector already populated: %s in %s\n",
__FUNCTION__, token, seinfo);
return -1;
}
if (!strcmp(token, ISOLATED_COMPUTE_APP_STR)) {
info->is |= IS_ISOLATED_COMPUTE_APP;
continue;
}
if (!strcmp(token, APPLY_SDK_SANDBOX_AUDIT_RESTRICTIONS_STR)) {
info->is |= IS_SDK_SANDBOX_AUDIT;
continue;
}
if (!strcmp(token, APPLY_SDK_SANDBOX_NEXT_RESTRICTIONS_STR)) {
info->is |= IS_SDK_SANDBOX_NEXT;
continue;
}
if (!strcmp(token, FROM_RUNAS_STR)) {
info->is |= IS_FROM_RUN_AS;
strncpy(info->isSelector, token, strlen(token));
continue;
}
if (!strncmp(token, TARGETSDKVERSION_STR, strlen(TARGETSDKVERSION_STR))) {
@ -792,7 +748,6 @@ int parse_seinfo(const char* seinfo, struct parsed_seinfo* info) {
__FUNCTION__, token, seinfo);
return -1;
}
info->isPreinstalledApp = true;
strncpy(info->partition, subtoken, strlen(subtoken));
continue;
}
@ -868,9 +823,6 @@ int seapp_context_lookup_internal(enum seapp_kind kind,
if (cur->isSystemServer != isSystemServer)
continue;
if (cur->isEphemeralAppSet && cur->isEphemeralApp != ((info.is & IS_EPHEMERAL_APP) != 0))
continue;
if (cur->user.str) {
if (cur->user.is_prefix) {
if (strncasecmp(username, cur->user.str, cur->user.len-1))
@ -899,23 +851,16 @@ int seapp_context_lookup_internal(enum seapp_kind kind,
}
}
if (cur->isPrivAppSet && cur->isPrivApp != ((info.is & IS_PRIV_APP) != 0))
continue;
if (cur->minTargetSdkVersion > info.targetSdkVersion)
continue;
if (cur->fromRunAs != ((info.is & IS_FROM_RUN_AS) != 0))
if (cur->isSelector && cur->isSelectorValue) {
if (!info.isSelector[0])
continue;
if (cur->isIsolatedComputeApp != ((info.is & IS_ISOLATED_COMPUTE_APP) != 0))
continue;
if (cur->isSdkSandboxAudit != ((info.is & IS_SDK_SANDBOX_AUDIT) != 0))
continue;
if (cur->isSdkSandboxNext != ((info.is & IS_SDK_SANDBOX_NEXT) != 0))
if (strcasecmp(info.isSelector, cur->isSelector)) {
continue;
}
}
if (kind == SEAPP_TYPE && !cur->type)
continue;
@ -940,7 +885,7 @@ int seapp_context_lookup_internal(enum seapp_kind kind,
goto oom;
}
if (info.isPreinstalledApp
if (info.partition[0]
&& !is_preinstalled_app_partition_valid(cur->partition, info.partition)) {
// TODO(b/280547417): make this an error after fixing violations
selinux_log(SELINUX_WARNING,

81
libselinux/src/android/android_unittest.cpp
View file

@ -12,7 +12,16 @@ using std::string;
class AndroidSELinuxTest : public ::testing::Test {
protected:
void SetUp() override {
default_seapp_context_ = StringPrintf("%s/seapp_contexts", tdir_.path);
default_seapp_path_alts_ = { .paths = {
{ default_seapp_context_.c_str() }
}};
}
TemporaryDir tdir_;
string default_seapp_context_;
path_alts_t default_seapp_path_alts_;
};
TEST_F(AndroidSELinuxTest, LoadAndLookupServiceContext)
@ -84,19 +93,13 @@ TEST_F(AndroidSELinuxTest, FailLoadingServiceContext)
TEST_F(AndroidSELinuxTest, LoadAndLookupSeAppContext)
{
string seapp_contexts =
StringPrintf("%s/seapp_contexts", tdir_.path);
WriteStringToFile(
"# some comment\n"
"user=_app seinfo=platform domain=platform_app type=app_data_file levelFrom=user\n",
seapp_contexts);
default_seapp_context_);
const path_alts_t seapp_paths = { .paths = {
{ seapp_contexts.c_str() }
}};
EXPECT_EQ(seapp_context_reload_internal(&seapp_paths), 0);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), 0);
context_t ctx = context_new("u:r:unknown");
int ret = seapp_context_lookup_internal(SEAPP_DOMAIN, 10001, false, "platform", "com.android.test1", ctx);
@ -111,6 +114,42 @@ TEST_F(AndroidSELinuxTest, LoadAndLookupSeAppContext)
context_free(ctx);
}
TEST_F(AndroidSELinuxTest, LoadSeAppContextInsecure)
{
WriteStringToFile(
"user=_app name=com.android.test domain=platform_app type=app_data_file\n",
default_seapp_context_);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), -1);
WriteStringToFile(
"user=_app name=com.android.test isSdkSandbox=true domain=platform_app type=app_data_file\n",
default_seapp_context_);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), -1);
WriteStringToFile(
"user=_app isPrivApp=false name=com.android.test domain=platform_app type=app_data_file\n",
default_seapp_context_);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), -1);
}
TEST_F(AndroidSELinuxTest, LoadSeAppContextInsecureWithSeInfoOrPrivApp)
{
WriteStringToFile(
"user=_app isPrivApp=true name=com.android.test domain=platform_app type=app_data_file\n",
default_seapp_context_);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), 0);
WriteStringToFile(
"user=_app seinfo=platform name=com.android.test domain=platform_app type=app_data_file\n",
default_seapp_context_);
EXPECT_EQ(seapp_context_reload_internal(&default_seapp_path_alts_), 0);
}
TEST(AndroidSeAppTest, ParseValidSeInfo)
{
struct parsed_seinfo info;
@ -122,8 +161,7 @@ TEST(AndroidSeAppTest, ParseValidSeInfo)
EXPECT_EQ(ret, 0);
EXPECT_STREQ(info.base, "default");
EXPECT_EQ(info.targetSdkVersion, 10000);
EXPECT_EQ(info.is, IS_PRIV_APP);
EXPECT_EQ(info.isPreinstalledApp, true);
EXPECT_STREQ(info.isSelector, "isPrivApp");
EXPECT_STREQ(info.partition, "system");
seinfo = "platform:ephemeralapp:partition=system:complete";
@ -132,8 +170,7 @@ TEST(AndroidSeAppTest, ParseValidSeInfo)
EXPECT_EQ(ret, 0);
EXPECT_STREQ(info.base, "platform");
EXPECT_EQ(info.targetSdkVersion, 0);
EXPECT_EQ(info.is, IS_EPHEMERAL_APP);
EXPECT_EQ(info.isPreinstalledApp, true);
EXPECT_STREQ(info.isSelector, "isEphemeralApp");
EXPECT_STREQ(info.partition, "system");
seinfo = "bluetooth";
@ -142,8 +179,16 @@ TEST(AndroidSeAppTest, ParseValidSeInfo)
EXPECT_EQ(ret, 0);
EXPECT_STREQ(info.base, "bluetooth");
EXPECT_EQ(info.targetSdkVersion, 0);
EXPECT_EQ(info.isPreinstalledApp, false);
EXPECT_EQ(info.is, 0);
EXPECT_STREQ(info.isSelector, "");
seinfo = "default:isSdkSandboxNext:partition=system:complete";
ret = parse_seinfo(seinfo.c_str(), &info);
EXPECT_EQ(ret, 0);
EXPECT_STREQ(info.base, "default");
EXPECT_EQ(info.targetSdkVersion, 0);
EXPECT_STREQ(info.isSelector, "isSdkSandboxNext");
EXPECT_STREQ(info.partition, "system");
}
TEST(AndroidSeAppTest, ParseInvalidSeInfo)
@ -157,6 +202,14 @@ TEST(AndroidSeAppTest, ParseInvalidSeInfo)
seinfo = "default:targetSdkVersion=:complete";
ret = parse_seinfo(seinfo.c_str(), &info);
EXPECT_EQ(ret, -1);
seinfo = "default:privapp:ephemeralapp:complete";
ret = parse_seinfo(seinfo.c_str(), &info);
EXPECT_EQ(ret, -1);
seinfo = "default:isANewSelector:isAnotherOne:complete";
ret = parse_seinfo(seinfo.c_str(), &info);
EXPECT_EQ(ret, -1);
}
TEST(AndroidSeAppTest, ParseOverflow)