[thirdparty/systemd.git] / src / core / smack-setup.c

/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
  Copyright © 2013 Intel Corporation
  Authors:
        Nathaniel Chen <nathaniel.chen@intel.com>
***/

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "alloc-util.h"
#include "dirent-util.h"
#include "fd-util.h"
#include "fileio.h"
#include "log.h"
#include "macro.h"
#include "smack-setup.h"
#include "string-util.h"
#include "util.h"

#if ENABLE_SMACK

static int fdopen_unlocked_at(int dfd, const char *dir, const char *name, int *status, FILE **ret_file) {
        int fd, r;
        FILE *f;

        fd = openat(dfd, name, O_RDONLY|O_CLOEXEC);
        if (fd < 0) {
                if (*status == 0)
                        *status = -errno;

                return log_warning_errno(errno, "Failed to open \"%s/%s\": %m", dir, name);
        }

        r = fdopen_unlocked(fd, "r", &f);
        if (r < 0) {
                if (*status == 0)
                        *status = r;

                safe_close(fd);
                return log_error_errno(r, "Failed to open \"%s/%s\": %m", dir, name);
        }

        *ret_file = f;
        return 0;
}

static int write_access2_rules(const char *srcdir) {
        _cleanup_close_ int load2_fd = -1, change_fd = -1;
        _cleanup_closedir_ DIR *dir = NULL;
        struct dirent *entry;
        int dfd = -1, r = 0;

        load2_fd = open("/sys/fs/smackfs/load2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
        if (load2_fd < 0)  {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
                return -errno; /* negative error */
        }

        change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
        if (change_fd < 0)  {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
                return -errno; /* negative error */
        }

        /* write rules to load2 or change-rule from every file in the directory */
        dir = opendir(srcdir);
        if (!dir) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
                return errno; /* positive on purpose */
        }

        dfd = dirfd(dir);
        assert(dfd >= 0);

        FOREACH_DIRENT(entry, dir, return 0) {
                _cleanup_fclose_ FILE *policy = NULL;

                if (!dirent_is_file(entry))
                        continue;

                if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
                        continue;

                /* load2 write rules in the kernel require a line buffered stream */
                for (;;) {
                        _cleanup_free_ char *buf = NULL, *sbj = NULL, *obj = NULL, *acc1 = NULL, *acc2 = NULL;
                        int q;

                        q = read_line(policy, NAME_MAX, &buf);
                        if (q < 0)
                                return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
                        if (q == 0)
                                break;

                        if (isempty(buf) || strchr(COMMENTS, buf[0]))
                                continue;

                        /* if 3 args -> load rule   : subject object access1 */
                        /* if 4 args -> change rule : subject object access1 access2 */
                        if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
                                log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
                                continue;
                        }

                        if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
                                if (r == 0)
                                        r = -errno;
                                log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
                                                buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
                        }
                }
        }

        return r;
}

static int write_cipso2_rules(const char *srcdir) {
        _cleanup_close_ int cipso2_fd = -1;
        _cleanup_closedir_ DIR *dir = NULL;
        struct dirent *entry;
        int dfd = -1, r = 0;

        cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
        if (cipso2_fd < 0)  {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
                return -errno; /* negative error */
        }

        /* write rules to cipso2 from every file in the directory */
        dir = opendir(srcdir);
        if (!dir) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
                return errno; /* positive on purpose */
        }

        dfd = dirfd(dir);
        assert(dfd >= 0);

        FOREACH_DIRENT(entry, dir, return 0) {
                _cleanup_fclose_ FILE *policy = NULL;

                if (!dirent_is_file(entry))
                        continue;

                if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
                        continue;

                /* cipso2 write rules in the kernel require a line buffered stream */
                for (;;) {
                        _cleanup_free_ char *buf = NULL;
                        int q;

                        q = read_line(policy, NAME_MAX, &buf);
                        if (q < 0)
                                return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
                        if (q == 0)
                                break;

                        if (isempty(buf) || strchr(COMMENTS, buf[0]))
                                continue;

                        if (write(cipso2_fd, buf, strlen(buf)) < 0) {
                                if (r == 0)
                                        r = -errno;
                                log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
                                                buf, entry->d_name);
                                break;
                        }
                }
        }

        return r;
}

static int write_netlabel_rules(const char *srcdir) {
        _cleanup_fclose_ FILE *dst = NULL;
        _cleanup_closedir_ DIR *dir = NULL;
        struct dirent *entry;
        int dfd = -1, r = 0;

        dst = fopen("/sys/fs/smackfs/netlabel", "we");
        if (!dst)  {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
                return -errno; /* negative error */
        }

        /* write rules to dst from every file in the directory */
        dir = opendir(srcdir);
        if (!dir) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
                return errno; /* positive on purpose */
        }

        dfd = dirfd(dir);
        assert(dfd >= 0);

        FOREACH_DIRENT(entry, dir, return 0) {
                _cleanup_fclose_ FILE *policy = NULL;

                if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
                        continue;

                /* load2 write rules in the kernel require a line buffered stream */
                for (;;) {
                        _cleanup_free_ char *buf = NULL;
                        int q;

                        q = read_line(policy, NAME_MAX, &buf);
                        if (q < 0)
                                return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
                        if (q == 0)
                                break;

                        if (!fputs(buf, dst)) {
                                if (r == 0)
                                        r = -EINVAL;
                                log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
                                break;
                        }
                        q = fflush_and_check(dst);
                        if (q < 0) {
                                if (r == 0)
                                        r = q;
                                log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
                                break;
                        }
                }
        }

        return r;
}

static int write_onlycap_list(void) {
        _cleanup_close_ int onlycap_fd = -1;
        _cleanup_free_ char *list = NULL;
        _cleanup_fclose_ FILE *f = NULL;
        size_t len = 0;
        int r;

        f = fopen("/etc/smack/onlycap", "re");
        if (!f) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");

                return errno == ENOENT ? ENOENT : -errno;
        }

        for (;;) {
                _cleanup_free_ char *buf = NULL;
                size_t l;

                r = read_line(f, LONG_LINE_MAX, &buf);
                if (r < 0)
                        return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
                if (r == 0)
                        break;

                if (isempty(buf) || strchr(COMMENTS, *buf))
                        continue;

                l = strlen(buf);
                if (!GREEDY_REALLOC(list, len + l + 1))
                        return log_oom();

                stpcpy(list + len, buf)[0] = ' ';
                len += l + 1;
        }

        if (len == 0)
                return 0;

        list[len - 1] = 0;

        onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
        if (onlycap_fd < 0) {
                if (errno != ENOENT)
                        log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
                return -errno; /* negative error */
        }

        r = write(onlycap_fd, list, len);
        if (r < 0)
                return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);

        return 0;
}

#endif

int mac_smack_setup(bool *loaded_policy) {

#if ENABLE_SMACK

        int r;

        assert(loaded_policy);

        r = write_access2_rules("/etc/smack/accesses.d/");
        switch(r) {
        case -ENOENT:
                log_debug("Smack is not enabled in the kernel.");
                return 0;
        case ENOENT:
                log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
                return 0;
        case 0:
                log_info("Successfully loaded Smack policies.");
                break;
        default:
                log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
                return 0;
        }

#ifdef SMACK_RUN_LABEL
        r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
        if (r < 0)
                log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
        r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
        if (r < 0)
                log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
        r = write_string_file("/sys/fs/smackfs/netlabel",
                              "0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
        if (r < 0)
                log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
        r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
        if (r < 0)
                log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
#endif

        r = write_cipso2_rules("/etc/smack/cipso.d/");
        switch(r) {
        case -ENOENT:
                log_debug("Smack/CIPSO is not enabled in the kernel.");
                return 0;
        case ENOENT:
                log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
                break;
        case 0:
                log_info("Successfully loaded Smack/CIPSO policies.");
                break;
        default:
                log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
                break;
        }

        r = write_netlabel_rules("/etc/smack/netlabel.d/");
        switch(r) {
        case -ENOENT:
                log_debug("Smack/CIPSO is not enabled in the kernel.");
                return 0;
        case ENOENT:
                log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
                break;
        case 0:
                log_info("Successfully loaded Smack network host rules.");
                break;
        default:
                log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
                break;
        }

        r = write_onlycap_list();
        switch(r) {
        case -ENOENT:
                log_debug("Smack is not enabled in the kernel.");
                break;
        case ENOENT:
                log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
                break;
        case 0:
                log_info("Successfully wrote Smack onlycap list.");
                break;
        default:
                return log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
        }

        *loaded_policy = true;

#endif

        return 0;
}
Commit	Line	Data
db9ecf05	1	/* SPDX-License-Identifier: LGPL-2.1-or-later */
ffbd2c4d	2	/***
810adae9	3	Copyright © 2013 Intel Corporation
ffbd2c4d NC	4	Authors:
ffbd2c4d NC	5	Nathaniel Chen <nathaniel.chen@intel.com>
ffbd2c4d NC	6	***/
ffbd2c4d NC	7
ffbd2c4d	8	#include <errno.h>
ffbd2c4d	9	#include <fcntl.h>
07630cea LP	10	#include <stdio.h>
07630cea LP	11	#include <stdlib.h>
ca78ad1d	12	#include <unistd.h>
ffbd2c4d	13
b5efdb8a	14	#include "alloc-util.h"
a0956174	15	#include "dirent-util.h"
3ffd4af2	16	#include "fd-util.h"
8b197c3a	17	#include "fileio.h"
ffbd2c4d	18	#include "log.h"
07630cea	19	#include "macro.h"
3ffd4af2	20	#include "smack-setup.h"
07630cea LP	21	#include "string-util.h"
07630cea LP	22	#include "util.h"
ffbd2c4d	23
f9fa32f0	24	#if ENABLE_SMACK
2b3e18de	25
b636d78a ZJS	26	static int fdopen_unlocked_at(int dfd, const char dir, const char name, int status, FILE *ret_file) {
	27	int fd, r;
	28	FILE *f;
	29
	30	fd = openat(dfd, name, O_RDONLY\|O_CLOEXEC);
	31	if (fd < 0) {
	32	if (*status == 0)
	33	*status = -errno;
	34
	35	return log_warning_errno(errno, "Failed to open \"%s/%s\": %m", dir, name);
	36	}
	37
	38	r = fdopen_unlocked(fd, "r", &f);
	39	if (r < 0) {
	40	if (*status == 0)
	41	*status = r;
	42
	43	safe_close(fd);
	44	return log_error_errno(r, "Failed to open \"%s/%s\": %m", dir, name);
	45	}
	46
	47	*ret_file = f;
	48	return 0;
	49	}
	50
	51	static int write_access2_rules(const char *srcdir) {
6656aefb	52	_cleanup_close_ int load2_fd = -1, change_fd = -1;
ffbd2c4d NC	53	_cleanup_closedir_ DIR *dir = NULL;
ffbd2c4d NC	54	struct dirent *entry;
b636d78a	55	int dfd = -1, r = 0;
ffbd2c4d	56
6656aefb WC	57	load2_fd = open("/sys/fs/smackfs/load2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	58	if (load2_fd < 0) {
	59	if (errno != ENOENT)
	60	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
	61	return -errno; /* negative error */
	62	}
	63
	64	change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	65	if (change_fd < 0) {
a4783bd1	66	if (errno != ENOENT)
6656aefb	67	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
a4783bd1	68	return -errno; /* negative error */
ffbd2c4d NC	69	}
ffbd2c4d NC	70
6656aefb	71	/* write rules to load2 or change-rule from every file in the directory */
a4783bd1	72	dir = opendir(srcdir);
ffbd2c4d	73	if (!dir) {
a4783bd1	74	if (errno != ENOENT)
6656aefb	75	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
a4783bd1	76	return errno; /* positive on purpose */
ffbd2c4d NC	77	}
	78
	79	dfd = dirfd(dir);
fea7838e	80	assert(dfd >= 0);
ffbd2c4d NC	81
	82	FOREACH_DIRENT(entry, dir, return 0) {
	83	_cleanup_fclose_ FILE *policy = NULL;
ffbd2c4d	84
6656aefb WC	85	if (!dirent_is_file(entry))
	86	continue;
	87
b636d78a	88	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ffbd2c4d	89	continue;
ffbd2c4d	90
ffbd2c4d	91	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	92	for (;;) {
	93	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	94	int q;
6656aefb	95
ea8b6526 LP	96	q = read_line(policy, NAME_MAX, &buf);
	97	if (q < 0)
	98	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	99	if (q == 0)
	100	break;
6656aefb	101
ea8b6526	102	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	103	continue;
	104
	105	/* if 3 args -> load rule : subject object access1 */
	106	/* if 4 args -> change rule : subject object access1 access2 */
	107	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	108	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	109	continue;
	110	}
	111
	112	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	113	if (r == 0)
6656aefb	114	r = -errno;
5e1ee764	115	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	116	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	117	}
6656aefb WC	118	}
	119	}
	120
	121	return r;
	122	}
	123
b636d78a	124	static int write_cipso2_rules(const char *srcdir) {
6656aefb WC	125	_cleanup_close_ int cipso2_fd = -1;
	126	_cleanup_closedir_ DIR *dir = NULL;
	127	struct dirent *entry;
b636d78a	128	int dfd = -1, r = 0;
6656aefb WC	129
	130	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	131	if (cipso2_fd < 0) {
	132	if (errno != ENOENT)
	133	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	134	return -errno; /* negative error */
	135	}
	136
	137	/* write rules to cipso2 from every file in the directory */
	138	dir = opendir(srcdir);
	139	if (!dir) {
	140	if (errno != ENOENT)
	141	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	142	return errno; /* positive on purpose */
	143	}
	144
	145	dfd = dirfd(dir);
	146	assert(dfd >= 0);
	147
	148	FOREACH_DIRENT(entry, dir, return 0) {
6656aefb WC	149	_cleanup_fclose_ FILE *policy = NULL;
	150
	151	if (!dirent_is_file(entry))
	152	continue;
	153
b636d78a	154	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
6656aefb	155	continue;
6656aefb WC	156
6656aefb WC	157	/* cipso2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	158	for (;;) {
	159	_cleanup_free_ char *buf = NULL;
	160	int q;
	161
	162	q = read_line(policy, NAME_MAX, &buf);
	163	if (q < 0)
	164	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	165	if (q == 0)
	166	break;
6656aefb	167
ea8b6526	168	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	169	continue;
	170
	171	if (write(cipso2_fd, buf, strlen(buf)) < 0) {
a4783bd1 ZJS	172	if (r == 0)
a4783bd1 ZJS	173	r = -errno;
5e1ee764	174	log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
6656aefb	175	buf, entry->d_name);
a4783bd1 ZJS	176	break;
a4783bd1 ZJS	177	}
ffbd2c4d NC	178	}
	179	}
	180
6656aefb	181	return r;
a4783bd1 ZJS	182	}
a4783bd1 ZJS	183
b636d78a	184	static int write_netlabel_rules(const char *srcdir) {
ae176752 CS	185	_cleanup_fclose_ FILE *dst = NULL;
	186	_cleanup_closedir_ DIR *dir = NULL;
	187	struct dirent *entry;
b636d78a	188	int dfd = -1, r = 0;
ae176752 CS	189
	190	dst = fopen("/sys/fs/smackfs/netlabel", "we");
	191	if (!dst) {
	192	if (errno != ENOENT)
	193	log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
	194	return -errno; /* negative error */
	195	}
	196
	197	/* write rules to dst from every file in the directory */
	198	dir = opendir(srcdir);
	199	if (!dir) {
	200	if (errno != ENOENT)
	201	log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
	202	return errno; /* positive on purpose */
	203	}
	204
	205	dfd = dirfd(dir);
	206	assert(dfd >= 0);
	207
	208	FOREACH_DIRENT(entry, dir, return 0) {
ae176752 CS	209	_cleanup_fclose_ FILE *policy = NULL;
ae176752 CS	210
b636d78a	211	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ae176752	212	continue;
0d536673	213
ae176752	214	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	215	for (;;) {
ea8b6526 LP	216	_cleanup_free_ char *buf = NULL;
0d536673 LP	217	int q;
0d536673 LP	218
ea8b6526 LP	219	q = read_line(policy, NAME_MAX, &buf);
	220	if (q < 0)
	221	return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
	222	if (q == 0)
	223	break;
	224
0d536673	225	if (!fputs(buf, dst)) {
ae176752 CS	226	if (r == 0)
ae176752 CS	227	r = -EINVAL;
5e1ee764	228	log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	229	break;
ae176752 CS	230	}
0d536673 LP	231	q = fflush_and_check(dst);
0d536673 LP	232	if (q < 0) {
ae176752	233	if (r == 0)
0d536673 LP	234	r = q;
0d536673 LP	235	log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	236	break;
	237	}
	238	}
	239	}
	240
7f508f2c	241	return r;
ae176752 CS	242	}
ae176752 CS	243
217f95db WC	244	static int write_onlycap_list(void) {
	245	_cleanup_close_ int onlycap_fd = -1;
	246	_cleanup_free_ char *list = NULL;
	247	_cleanup_fclose_ FILE *f = NULL;
319a4f4b	248	size_t len = 0;
217f95db WC	249	int r;
	250
	251	f = fopen("/etc/smack/onlycap", "re");
	252	if (!f) {
	253	if (errno != ENOENT)
9fd0b029 LP	254	log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");
9fd0b029 LP	255
217f95db WC	256	return errno == ENOENT ? ENOENT : -errno;
	257	}
	258
ea8b6526 LP	259	for (;;) {
ea8b6526 LP	260	_cleanup_free_ char *buf = NULL;
217f95db WC	261	size_t l;
217f95db WC	262
ea8b6526 LP	263	r = read_line(f, LONG_LINE_MAX, &buf);
	264	if (r < 0)
	265	return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
	266	if (r == 0)
	267	break;
	268
	269	if (isempty(buf) \|\| strchr(COMMENTS, *buf))
217f95db WC	270	continue;
	271
	272	l = strlen(buf);
319a4f4b	273	if (!GREEDY_REALLOC(list, len + l + 1))
217f95db WC	274	return log_oom();
	275
	276	stpcpy(list + len, buf)[0] = ' ';
	277	len += l + 1;
	278	}
	279
9fd0b029	280	if (len == 0)
217f95db WC	281	return 0;
	282
	283	list[len - 1] = 0;
	284
	285	onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	286	if (onlycap_fd < 0) {
	287	if (errno != ENOENT)
9fd0b029	288	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
217f95db WC	289	return -errno; /* negative error */
	290	}
	291
	292	r = write(onlycap_fd, list, len);
	293	if (r < 0)
9fd0b029	294	return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);
217f95db WC	295
	296	return 0;
	297	}
	298
2b3e18de	299	#endif
ffbd2c4d	300
8a188de9	301	int mac_smack_setup(bool *loaded_policy) {
2b3e18de	302
f9fa32f0	303	#if ENABLE_SMACK
2b3e18de	304
a4783bd1 ZJS	305	int r;
a4783bd1 ZJS	306
e49d3c01 ŁS	307	assert(loaded_policy);
e49d3c01 ŁS	308
6656aefb	309	r = write_access2_rules("/etc/smack/accesses.d/");
a4783bd1 ZJS	310	switch(r) {
	311	case -ENOENT:
	312	log_debug("Smack is not enabled in the kernel.");
	313	return 0;
	314	case ENOENT:
6656aefb	315	log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
a4783bd1 ZJS	316	return 0;
	317	case 0:
	318	log_info("Successfully loaded Smack policies.");
abbacb1d NC	319	break;
abbacb1d NC	320	default:
e53fc357	321	log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
abbacb1d NC	322	return 0;
	323	}
	324
8b197c3a	325	#ifdef SMACK_RUN_LABEL
57512c89	326	r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	327	if (r < 0)
ae176752 CS	328	log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
57512c89	329	r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	330	if (r < 0)
	331	log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
	332	r = write_string_file("/sys/fs/smackfs/netlabel",
57512c89	333	"0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	334	if (r < 0)
ae176752 CS	335	log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
57512c89	336	r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	337	if (r < 0)
ae176752 CS	338	log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
8b197c3a AK	339	#endif
8b197c3a AK	340
6656aefb	341	r = write_cipso2_rules("/etc/smack/cipso.d/");
abbacb1d NC	342	switch(r) {
	343	case -ENOENT:
	344	log_debug("Smack/CIPSO is not enabled in the kernel.");
	345	return 0;
	346	case ENOENT:
6656aefb	347	log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
ae176752	348	break;
abbacb1d NC	349	case 0:
abbacb1d NC	350	log_info("Successfully loaded Smack/CIPSO policies.");
b9289d4c	351	break;
a4783bd1	352	default:
e53fc357	353	log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
ae176752 CS	354	break;
	355	}
	356
	357	r = write_netlabel_rules("/etc/smack/netlabel.d/");
	358	switch(r) {
	359	case -ENOENT:
	360	log_debug("Smack/CIPSO is not enabled in the kernel.");
a4783bd1	361	return 0;
ae176752 CS	362	case ENOENT:
	363	log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
	364	break;
	365	case 0:
	366	log_info("Successfully loaded Smack network host rules.");
	367	break;
	368	default:
	369	log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
	370	break;
a4783bd1	371	}
2b3e18de	372
217f95db WC	373	r = write_onlycap_list();
	374	switch(r) {
	375	case -ENOENT:
	376	log_debug("Smack is not enabled in the kernel.");
	377	break;
	378	case ENOENT:
	379	log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
	380	break;
	381	case 0:
	382	log_info("Successfully wrote Smack onlycap list.");
	383	break;
	384	default:
d85ff944	385	return log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	386	}
217f95db WC	387
e49d3c01 ŁS	388	*loaded_policy = true;
e49d3c01 ŁS	389
2b3e18de KL	390	#endif
	391
	392	return 0;
ffbd2c4d	393	}