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UTILS: add capabilities management helpers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,208 @@ | ||
| /* | ||
| SSSD | ||
| Capabilities management helpers | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
| */ | ||
|
|
||
| #include "config.h" | ||
| #include <sys/prctl.h> | ||
| #include <linux/securebits.h> | ||
| #include <sys/capability.h> | ||
|
|
||
| #include "util/util.h" | ||
|
|
||
|
|
||
| typedef struct _cap_description | ||
| { | ||
| cap_value_t val; | ||
| const char *name; | ||
| } cap_description; | ||
|
|
||
| #define _CAP_DESCR(cap) {cap, #cap} | ||
|
|
||
| static cap_description _all_caps[] = | ||
| { | ||
| _CAP_DESCR(CAP_AUDIT_CONTROL), | ||
| _CAP_DESCR(CAP_AUDIT_READ), | ||
| _CAP_DESCR(CAP_AUDIT_WRITE), | ||
| _CAP_DESCR(CAP_BLOCK_SUSPEND), | ||
| _CAP_DESCR(CAP_BPF), | ||
| _CAP_DESCR(CAP_CHECKPOINT_RESTORE), | ||
| _CAP_DESCR(CAP_CHOWN), | ||
| _CAP_DESCR(CAP_DAC_OVERRIDE), | ||
| _CAP_DESCR(CAP_DAC_READ_SEARCH), | ||
| _CAP_DESCR(CAP_FOWNER), | ||
| _CAP_DESCR(CAP_FSETID), | ||
| _CAP_DESCR(CAP_IPC_LOCK), | ||
| _CAP_DESCR(CAP_IPC_OWNER), | ||
| _CAP_DESCR(CAP_KILL), | ||
| _CAP_DESCR(CAP_LEASE), | ||
| _CAP_DESCR(CAP_LINUX_IMMUTABLE), | ||
| _CAP_DESCR(CAP_MAC_ADMIN), | ||
| _CAP_DESCR(CAP_MAC_OVERRIDE), | ||
| _CAP_DESCR(CAP_MKNOD), | ||
| _CAP_DESCR(CAP_NET_ADMIN), | ||
| _CAP_DESCR(CAP_NET_BIND_SERVICE), | ||
| _CAP_DESCR(CAP_NET_BROADCAST), | ||
| _CAP_DESCR(CAP_NET_RAW), | ||
| _CAP_DESCR(CAP_PERFMON), | ||
| _CAP_DESCR(CAP_SETGID), | ||
| _CAP_DESCR(CAP_SETFCAP), | ||
| _CAP_DESCR(CAP_SETPCAP), | ||
| _CAP_DESCR(CAP_SETUID), | ||
| _CAP_DESCR(CAP_SYS_ADMIN), | ||
| _CAP_DESCR(CAP_SYS_BOOT), | ||
| _CAP_DESCR(CAP_SYS_CHROOT), | ||
| _CAP_DESCR(CAP_SYS_MODULE), | ||
| _CAP_DESCR(CAP_SYS_NICE), | ||
| _CAP_DESCR(CAP_SYS_PACCT), | ||
| _CAP_DESCR(CAP_SYS_PTRACE), | ||
| _CAP_DESCR(CAP_SYS_RAWIO), | ||
| _CAP_DESCR(CAP_SYS_RESOURCE), | ||
| _CAP_DESCR(CAP_SYS_TIME), | ||
| _CAP_DESCR(CAP_SYS_TTY_CONFIG), | ||
| _CAP_DESCR(CAP_SYSLOG), | ||
| _CAP_DESCR(CAP_WAKE_ALARM) | ||
| }; | ||
|
|
||
| static inline const char *cap_flag_to_str(cap_flag_value_t flag) | ||
| { | ||
| if (flag == CAP_SET) { | ||
| return "*1*"; | ||
| } | ||
| return " 0 "; | ||
| } | ||
|
|
||
| errno_t sss_log_caps_to_str(bool only_non_zero, char **_str) | ||
| { | ||
| int ret; | ||
| char *str = NULL; | ||
| size_t i; | ||
| cap_t caps; | ||
| cap_flag_value_t effective, permitted, bounding; | ||
|
|
||
| caps = cap_get_proc(); | ||
| if (caps == NULL) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_get_proc() failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| return ret; | ||
| } | ||
|
|
||
| for (i = 0; i < sizeof(_all_caps)/sizeof(cap_description); ++i) { | ||
| if (!CAP_IS_SUPPORTED(_all_caps[i].val)) { | ||
| continue; | ||
| } | ||
| ret = cap_get_flag(caps, _all_caps[i].val, CAP_EFFECTIVE, &effective); | ||
| if (ret == -1) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, | ||
| "cap_get_flag(CAP_EFFECTIVE) failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
| ret = cap_get_flag(caps, _all_caps[i].val, CAP_PERMITTED, &permitted); | ||
| if (ret == -1) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, | ||
| "cap_get_flag(CAP_PERMITTED) failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
| ret = cap_get_bound(_all_caps[i].val); | ||
| if (ret == 1) { | ||
| bounding = CAP_SET; | ||
| } else if (ret == 0) { | ||
| bounding = CAP_CLEAR; | ||
| } else { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_get_bound failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
|
|
||
| if (only_non_zero && (effective == CAP_CLEAR) && | ||
| (permitted == CAP_CLEAR) && (bounding == CAP_CLEAR)) { | ||
| continue; | ||
| } | ||
|
|
||
| str = talloc_asprintf_append(str, | ||
| " %25s: effective = %s, permitted = %s, bounding = %s\n", | ||
| _all_caps[i].name, cap_flag_to_str(effective), | ||
| cap_flag_to_str(permitted), cap_flag_to_str(bounding)); | ||
| if (str == NULL) { | ||
| ret = ENOMEM; | ||
| goto done; | ||
| } | ||
| } | ||
|
|
||
| ret = 0; | ||
|
|
||
| done: | ||
| if (ret == 0) { | ||
| *_str = str; | ||
| } else { | ||
| talloc_free(str); | ||
| } | ||
|
|
||
| if (cap_free(caps) == -1) { | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_free() failed\n"); | ||
| } | ||
|
|
||
| return ret; | ||
| } | ||
|
|
||
| errno_t sss_drop_cap(cap_value_t cap) | ||
| { | ||
| int ret; | ||
|
|
||
| cap_t caps = cap_get_proc(); | ||
| if (caps == NULL) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_get_proc() failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| return ret; | ||
| } | ||
| if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &cap, CAP_CLEAR) == -1) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, | ||
| "cap_set_flag(CAP_EFFECTIVE) failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
| if (cap_set_flag(caps, CAP_PERMITTED, 1, &cap, CAP_CLEAR) == -1) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, | ||
| "cap_set_flag(CAP_PERMITTED) failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
| if (cap_set_proc(caps) == -1) { | ||
| ret = errno; | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_set_proc() failed: %d ('%s')\n", | ||
| ret, strerror(ret)); | ||
| goto done; | ||
| } | ||
|
|
||
| ret = 0; | ||
|
|
||
| done: | ||
| if (cap_free(caps) == -1) { | ||
| DEBUG(SSSDBG_TRACE_FUNC, "cap_free() failed\n"); | ||
| } | ||
|
|
||
| return ret; | ||
| } |
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