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-rw-r--r--util-linux/setpriv.c106
1 files changed, 95 insertions, 11 deletions
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index 89fa2fc10..a1fa889e7 100644
--- a/util-linux/setpriv.c
+++ b/util-linux/setpriv.c
@@ -56,6 +56,9 @@
//usage: "\n-d,--dump Show current capabilities"
//usage: )
//usage: "\n--nnp,--no-new-privs Ignore setuid/setgid bits and file capabilities"
+//usage: IF_FEATURE_SETPRIV_CAPABILITIES(
+//usage: "\n--inh-caps CAP[,CAP...] Set inheritable capabilities"
+//usage: )
//setpriv from util-linux 2.28:
// -d, --dump show current state (and do not exec anything)
@@ -101,9 +104,11 @@
enum {
IF_FEATURE_SETPRIV_DUMP(OPTBIT_DUMP,)
+ IF_FEATURE_SETPRIV_CAPABILITIES(OPTBIT_INH,)
OPTBIT_NNP,
IF_FEATURE_SETPRIV_DUMP(OPT_DUMP = (1 << OPTBIT_DUMP),)
+ IF_FEATURE_SETPRIV_CAPABILITIES(OPT_INH = (1 << OPTBIT_INH),)
OPT_NNP = (1 << OPTBIT_NNP),
};
@@ -159,8 +164,7 @@ static const char *const capabilities[] = {
#endif /* FEATURE_SETPRIV_CAPABILITIES */
-#if ENABLE_FEATURE_SETPRIV_DUMP
-# if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+#if ENABLE_FEATURE_SETPRIV_CAPABILITIES
static void getcaps(struct caps *caps)
{
int versions[] = {
@@ -197,8 +201,9 @@ static void getcaps(struct caps *caps)
if (capget(&caps->header, caps->data) < 0)
bb_simple_perror_msg_and_die("capget");
}
-# endif /* FEATURE_SETPRIV_CAPABILITIES */
+#endif /* FEATURE_SETPRIV_CAPABILITIES */
+#if ENABLE_FEATURE_SETPRIV_DUMP
static int dump(void)
{
IF_FEATURE_SETPRIV_CAPABILITIES(struct caps caps;)
@@ -215,7 +220,7 @@ static int dump(void)
nnp = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
if (nnp < 0)
- bb_simple_perror_msg_and_die("prctl: GET_NO_NEW_PRIVS");
+ bb_perror_msg_and_die("prctl: %s", "GET_NO_NEW_PRIVS");
printf("uid: %u\n", (unsigned)ruid);
printf("euid: %u\n", (unsigned)euid);
@@ -262,7 +267,7 @@ static int dump(void)
for (i = 0; cap_valid(i); i++) {
int ret = prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, (unsigned long) i, 0UL, 0UL);
if (ret < 0)
- bb_simple_perror_msg_and_die("prctl: CAP_AMBIENT_IS_SET");
+ bb_perror_msg_and_die("prctl: %s", "CAP_AMBIENT_IS_SET");
if (ret) {
# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
if (i < ARRAY_SIZE(capabilities))
@@ -283,7 +288,7 @@ static int dump(void)
for (i = 0; cap_valid(i); i++) {
int ret = prctl(PR_CAPBSET_READ, (unsigned long) i, 0UL, 0UL, 0UL);
if (ret < 0)
- bb_simple_perror_msg_and_die("prctl: CAPBSET_READ");
+ bb_perror_msg_and_die("prctl: %s", "CAPBSET_READ");
if (ret) {
# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
if (i < ARRAY_SIZE(capabilities))
@@ -307,20 +312,94 @@ static int dump(void)
}
#endif /* FEATURE_SETPRIV_DUMP */
+#if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+static void parse_cap(unsigned long *index, int *add, const char *cap)
+{
+ unsigned long i;
+
+ switch (cap[0]) {
+ case '-':
+ *add = 0;
+ break;
+ case '+':
+ *add = 1;
+ break;
+ default:
+ bb_error_msg_and_die("invalid capability '%s'", cap);
+ break;
+ }
+
+ cap++;
+ if ((sscanf(cap, "cap_%lu", &i)) == 1) {
+ if (!cap_valid(i))
+ bb_error_msg_and_die("unsupported capability '%s'", cap);
+ *index = i;
+ return;
+ }
+
+# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
+ for (i = 0; i < ARRAY_SIZE(capabilities); i++) {
+ if (strcmp(capabilities[i], cap) != 0)
+ continue;
+
+ if (!cap_valid(i))
+ bb_error_msg_and_die("unsupported capability '%s'", cap);
+ *index = i;
+ return;
+ }
+# endif
+
+ bb_error_msg_and_die("unknown capability '%s'", cap);
+}
+
+static void set_inh_caps(char *capstring)
+{
+ struct caps caps;
+
+ getcaps(&caps);
+
+ capstring = strtok(capstring, ",");
+ while (capstring) {
+ unsigned long cap;
+ int add;
+
+ parse_cap(&cap, &add, capstring);
+ if (CAP_TO_INDEX(cap) >= caps.u32s)
+ bb_error_msg_and_die("invalid capability cap");
+ if (add)
+ caps.data[CAP_TO_INDEX(cap)].inheritable |= CAP_TO_MASK(cap);
+ else
+ caps.data[CAP_TO_INDEX(cap)].inheritable &= ~CAP_TO_MASK(cap);
+ capstring = strtok(NULL, ",");
+ }
+
+ if ((capset(&caps.header, caps.data)) < 0)
+ bb_perror_msg_and_die("capset");
+
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(caps.data);
+}
+#endif /* FEATURE_SETPRIV_CAPABILITIES */
+
int setpriv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setpriv_main(int argc UNUSED_PARAM, char **argv)
{
static const char setpriv_longopts[] ALIGN1 =
IF_FEATURE_SETPRIV_DUMP(
- "dump\0" No_argument "d"
+ "dump\0" No_argument "d"
+ )
+ "nnp\0" No_argument "\xff"
+ "no-new-privs\0" No_argument "\xff"
+ IF_FEATURE_SETPRIV_CAPABILITIES(
+ "inh-caps\0" Required_argument "\xfe"
)
- "nnp\0" No_argument "\xff"
- "no-new-privs\0" No_argument "\xff"
;
int opts;
+ IF_FEATURE_SETPRIV_CAPABILITIES(char *inh_caps;)
applet_long_options = setpriv_longopts;
- opts = getopt32(argv, "+"IF_FEATURE_SETPRIV_DUMP("d"));
+ opts = getopt32(argv, "+"IF_FEATURE_SETPRIV_DUMP("d")
+ IF_FEATURE_SETPRIV_CAPABILITIES("\xfe:", &inh_caps));
argv += optind;
#if ENABLE_FEATURE_SETPRIV_DUMP
@@ -332,9 +411,14 @@ int setpriv_main(int argc UNUSED_PARAM, char **argv)
#endif
if (opts & OPT_NNP) {
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0))
- bb_simple_perror_msg_and_die("prctl: NO_NEW_PRIVS");
+ bb_perror_msg_and_die("prctl: %s", "SET_NO_NEW_PRIVS");
}
+#if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+ if (opts & OPT_INH)
+ set_inh_caps(inh_caps);
+#endif
+
if (!argv[0])
bb_show_usage();
BB_EXECVP_or_die(argv);