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-rw-r--r--util-linux/setpriv.c151
1 files changed, 147 insertions, 4 deletions
diff --git a/util-linux/setpriv.c b/util-linux/setpriv.c
index 8d3f25875..a509204a2 100644
--- a/util-linux/setpriv.c
+++ b/util-linux/setpriv.c
@@ -23,6 +23,26 @@
//config: help
//config: Enables the "--dump" switch to print out the current privilege
//config: state. This is helpful for diagnosing problems.
+//config:
+//config:config FEATURE_SETPRIV_CAPABILITIES
+//config: bool "Support capabilities"
+//config: default y
+//config: depends on SETPRIV
+//config: help
+//config: Capabilities can be used to grant processes additional rights
+//config: without the necessity to always execute as the root user.
+//config: Enabling this option enables "--dump" to show information on
+//config: capabilities.
+//config:
+//config:config FEATURE_SETPRIV_CAPABILITY_NAMES
+//config: bool "Support capability names"
+//config: default y
+//config: depends on SETPRIV && FEATURE_SETPRIV_CAPABILITIES
+//config: help
+//config: Capabilities can be either referenced via a human-readble name,
+//config: e.g. "net_admin", or using their index, e.g. "cap_12". Enabling
+//config: this option allows using the human-readable names in addition to
+//config: the index-based names.
//applet:IF_SETPRIV(APPLET(setpriv, BB_DIR_BIN, BB_SUID_DROP))
@@ -55,6 +75,10 @@
// --selinux-label <label> set SELinux label
// --apparmor-profile <pr> set AppArmor profile
+#if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+#include <linux/capability.h>
+#include <sys/capability.h>
+#endif
#include <sys/prctl.h>
#include "libbb.h"
@@ -74,13 +98,106 @@ enum {
OPT_NNP = (1 << OPTBIT_NNP),
};
+#if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+struct caps {
+ struct __user_cap_header_struct header;
+ cap_user_data_t data;
+ int u32s;
+};
+
+#if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
+static const char *const capabilities[] = {
+ "chown",
+ "dac_override",
+ "dac_read_search",
+ "fowner",
+ "fsetid",
+ "kill",
+ "setgid",
+ "setuid",
+ "setpcap",
+ "linux_immutable",
+ "net_bind_service",
+ "net_broadcast",
+ "net_admin",
+ "net_raw",
+ "ipc_lock",
+ "ipc_owner",
+ "sys_module",
+ "sys_rawio",
+ "sys_chroot",
+ "sys_ptrace",
+ "sys_pacct",
+ "sys_admin",
+ "sys_boot",
+ "sys_nice",
+ "sys_resource",
+ "sys_time",
+ "sys_tty_config",
+ "mknod",
+ "lease",
+ "audit_write",
+ "audit_control",
+ "setfcap",
+ "mac_override",
+ "mac_admin",
+ "syslog",
+ "wake_alarm",
+ "block_suspend",
+ "audit_read",
+};
+#endif /* FEATURE_SETPRIV_CAPABILITY_NAMES */
+
+#endif /* FEATURE_SETPRIV_CAPABILITIES */
+
#if ENABLE_FEATURE_SETPRIV_DUMP
+# if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+static void getcaps(struct caps *caps)
+{
+ int versions[] = {
+ _LINUX_CAPABILITY_U32S_3,
+ _LINUX_CAPABILITY_U32S_2,
+ _LINUX_CAPABILITY_U32S_1,
+ };
+ int i;
+
+ caps->header.pid = 0;
+ for (i = 0; i < ARRAY_SIZE(versions); i++) {
+ caps->header.version = versions[i];
+ if (capget(&caps->header, NULL) == 0)
+ goto got_it;
+ }
+ bb_simple_perror_msg_and_die("capget");
+ got_it:
+
+ switch (caps->header.version) {
+ case _LINUX_CAPABILITY_VERSION_1:
+ caps->u32s = _LINUX_CAPABILITY_U32S_1;
+ break;
+ case _LINUX_CAPABILITY_VERSION_2:
+ caps->u32s = _LINUX_CAPABILITY_U32S_2;
+ break;
+ case _LINUX_CAPABILITY_VERSION_3:
+ caps->u32s = _LINUX_CAPABILITY_U32S_3;
+ break;
+ default:
+ bb_error_msg_and_die("unsupported capability version");
+ }
+
+ caps->data = xmalloc(sizeof(caps->data[0]) * caps->u32s);
+ if (capget(&caps->header, caps->data) < 0)
+ bb_simple_perror_msg_and_die("capget");
+}
+# endif /* FEATURE_SETPRIV_CAPABILITIES */
+
static int dump(void)
{
+ IF_FEATURE_SETPRIV_CAPABILITIES(struct caps caps;)
+ const char *fmt;
uid_t ruid, euid, suid;
gid_t rgid, egid, sgid;
gid_t *gids;
- int ngids, nnp;
+ int i, ngids, nnp;
getresuid(&ruid, &euid, &suid); /* never fails in Linux */
getresgid(&rgid, &egid, &sgid); /* never fails in Linux */
@@ -100,8 +217,7 @@ static int dump(void)
if (ngids == 0) {
printf("[none]");
} else {
- const char *fmt = ",%u" + 1;
- int i;
+ fmt = ",%u" + 1;
for (i = 0; i < ngids; i++) {
printf(fmt, (unsigned)gids[i]);
fmt = ",%u";
@@ -109,8 +225,35 @@ static int dump(void)
}
printf("\nno_new_privs: %d\n", nnp);
- if (ENABLE_FEATURE_CLEAN_UP)
+# if ENABLE_FEATURE_SETPRIV_CAPABILITIES
+ getcaps(&caps);
+ printf("Inheritable capabilities: ");
+ fmt = "";
+ for (i = 0; cap_valid(i); i++) {
+ unsigned idx = CAP_TO_INDEX(i);
+ if (idx >= caps.u32s) {
+ printf("\nindex: %u u32s: %u capability: %u\n", idx, caps.u32s, i);
+ bb_error_msg_and_die("unsupported capability");
+ }
+ if (caps.data[idx].inheritable & CAP_TO_MASK(i)) {
+# if ENABLE_FEATURE_SETPRIV_CAPABILITY_NAMES
+ if (i < ARRAY_SIZE(capabilities))
+ printf("%s%s", fmt, capabilities[i]);
+ else
+# endif
+ printf("%scap_%u", fmt, i);
+ fmt = ",";
+ }
+ }
+ if (!fmt[0])
+ printf("[none]");
+ bb_putchar('\n');
+# endif
+
+ if (ENABLE_FEATURE_CLEAN_UP) {
+ IF_FEATURE_SETPRIV_CAPABILITIES(free(caps.data);)
free(gids);
+ }
return EXIT_SUCCESS;
}
#endif /* FEATURE_SETPRIV_DUMP */