[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;
        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;
        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;
        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;
        }

#if HAVE_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	53	_cleanup_closedir_ DIR *dir = NULL;
b636d78a	54	int dfd = -1, r = 0;
ffbd2c4d	55
6656aefb WC	56	load2_fd = open("/sys/fs/smackfs/load2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	57	if (load2_fd < 0) {
	58	if (errno != ENOENT)
	59	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
	60	return -errno; /* negative error */
	61	}
	62
	63	change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	64	if (change_fd < 0) {
a4783bd1	65	if (errno != ENOENT)
6656aefb	66	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
a4783bd1	67	return -errno; /* negative error */
ffbd2c4d NC	68	}
ffbd2c4d NC	69
6656aefb	70	/* write rules to load2 or change-rule from every file in the directory */
a4783bd1	71	dir = opendir(srcdir);
ffbd2c4d	72	if (!dir) {
a4783bd1	73	if (errno != ENOENT)
6656aefb	74	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
a4783bd1	75	return errno; /* positive on purpose */
ffbd2c4d NC	76	}
	77
	78	dfd = dirfd(dir);
fea7838e	79	assert(dfd >= 0);
ffbd2c4d NC	80
	81	FOREACH_DIRENT(entry, dir, return 0) {
	82	_cleanup_fclose_ FILE *policy = NULL;
ffbd2c4d	83
6656aefb WC	84	if (!dirent_is_file(entry))
	85	continue;
	86
b636d78a	87	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ffbd2c4d	88	continue;
ffbd2c4d	89
ffbd2c4d	90	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	91	for (;;) {
	92	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	93	int q;
6656aefb	94
ea8b6526 LP	95	q = read_line(policy, NAME_MAX, &buf);
	96	if (q < 0)
	97	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	98	if (q == 0)
	99	break;
6656aefb	100
ea8b6526	101	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	102	continue;
	103
	104	/* if 3 args -> load rule : subject object access1 */
	105	/* if 4 args -> change rule : subject object access1 access2 */
	106	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	107	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	108	continue;
	109	}
	110
	111	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	112	if (r == 0)
6656aefb	113	r = -errno;
5e1ee764	114	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	115	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	116	}
6656aefb WC	117	}
	118	}
	119
	120	return r;
	121	}
	122
b636d78a	123	static int write_cipso2_rules(const char *srcdir) {
6656aefb WC	124	_cleanup_close_ int cipso2_fd = -1;
6656aefb WC	125	_cleanup_closedir_ DIR *dir = NULL;
b636d78a	126	int dfd = -1, r = 0;
6656aefb WC	127
	128	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	129	if (cipso2_fd < 0) {
	130	if (errno != ENOENT)
	131	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	132	return -errno; /* negative error */
	133	}
	134
	135	/* write rules to cipso2 from every file in the directory */
	136	dir = opendir(srcdir);
	137	if (!dir) {
	138	if (errno != ENOENT)
	139	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	140	return errno; /* positive on purpose */
	141	}
	142
	143	dfd = dirfd(dir);
	144	assert(dfd >= 0);
	145
	146	FOREACH_DIRENT(entry, dir, return 0) {
6656aefb WC	147	_cleanup_fclose_ FILE *policy = NULL;
	148
	149	if (!dirent_is_file(entry))
	150	continue;
	151
b636d78a	152	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
6656aefb	153	continue;
6656aefb WC	154
6656aefb WC	155	/* cipso2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	156	for (;;) {
	157	_cleanup_free_ char *buf = NULL;
	158	int q;
	159
	160	q = read_line(policy, NAME_MAX, &buf);
	161	if (q < 0)
	162	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	163	if (q == 0)
	164	break;
6656aefb	165
ea8b6526	166	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	167	continue;
	168
	169	if (write(cipso2_fd, buf, strlen(buf)) < 0) {
a4783bd1 ZJS	170	if (r == 0)
a4783bd1 ZJS	171	r = -errno;
5e1ee764	172	log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
6656aefb	173	buf, entry->d_name);
a4783bd1 ZJS	174	break;
a4783bd1 ZJS	175	}
ffbd2c4d NC	176	}
	177	}
	178
6656aefb	179	return r;
a4783bd1 ZJS	180	}
a4783bd1 ZJS	181
b636d78a	182	static int write_netlabel_rules(const char *srcdir) {
ae176752 CS	183	_cleanup_fclose_ FILE *dst = NULL;
ae176752 CS	184	_cleanup_closedir_ DIR *dir = NULL;
b636d78a	185	int dfd = -1, r = 0;
ae176752 CS	186
	187	dst = fopen("/sys/fs/smackfs/netlabel", "we");
	188	if (!dst) {
	189	if (errno != ENOENT)
	190	log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
	191	return -errno; /* negative error */
	192	}
	193
	194	/* write rules to dst from every file in the directory */
	195	dir = opendir(srcdir);
	196	if (!dir) {
	197	if (errno != ENOENT)
	198	log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
	199	return errno; /* positive on purpose */
	200	}
	201
	202	dfd = dirfd(dir);
	203	assert(dfd >= 0);
	204
	205	FOREACH_DIRENT(entry, dir, return 0) {
ae176752 CS	206	_cleanup_fclose_ FILE *policy = NULL;
ae176752 CS	207
b636d78a	208	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ae176752	209	continue;
0d536673	210
ae176752	211	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	212	for (;;) {
ea8b6526 LP	213	_cleanup_free_ char *buf = NULL;
0d536673 LP	214	int q;
0d536673 LP	215
ea8b6526 LP	216	q = read_line(policy, NAME_MAX, &buf);
	217	if (q < 0)
	218	return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
	219	if (q == 0)
	220	break;
	221
0d536673	222	if (!fputs(buf, dst)) {
ae176752 CS	223	if (r == 0)
ae176752 CS	224	r = -EINVAL;
5e1ee764	225	log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	226	break;
ae176752 CS	227	}
0d536673 LP	228	q = fflush_and_check(dst);
0d536673 LP	229	if (q < 0) {
ae176752	230	if (r == 0)
0d536673 LP	231	r = q;
0d536673 LP	232	log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	233	break;
	234	}
	235	}
	236	}
	237
7f508f2c	238	return r;
ae176752 CS	239	}
ae176752 CS	240
217f95db WC	241	static int write_onlycap_list(void) {
	242	_cleanup_close_ int onlycap_fd = -1;
	243	_cleanup_free_ char *list = NULL;
	244	_cleanup_fclose_ FILE *f = NULL;
319a4f4b	245	size_t len = 0;
217f95db WC	246	int r;
	247
	248	f = fopen("/etc/smack/onlycap", "re");
	249	if (!f) {
	250	if (errno != ENOENT)
9fd0b029 LP	251	log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");
9fd0b029 LP	252
217f95db WC	253	return errno == ENOENT ? ENOENT : -errno;
	254	}
	255
ea8b6526 LP	256	for (;;) {
ea8b6526 LP	257	_cleanup_free_ char *buf = NULL;
217f95db WC	258	size_t l;
217f95db WC	259
ea8b6526 LP	260	r = read_line(f, LONG_LINE_MAX, &buf);
	261	if (r < 0)
	262	return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
	263	if (r == 0)
	264	break;
	265
	266	if (isempty(buf) \|\| strchr(COMMENTS, *buf))
217f95db WC	267	continue;
	268
	269	l = strlen(buf);
319a4f4b	270	if (!GREEDY_REALLOC(list, len + l + 1))
217f95db WC	271	return log_oom();
	272
	273	stpcpy(list + len, buf)[0] = ' ';
	274	len += l + 1;
	275	}
	276
9fd0b029	277	if (len == 0)
217f95db WC	278	return 0;
	279
	280	list[len - 1] = 0;
	281
	282	onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	283	if (onlycap_fd < 0) {
	284	if (errno != ENOENT)
9fd0b029	285	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
217f95db WC	286	return -errno; /* negative error */
	287	}
	288
	289	r = write(onlycap_fd, list, len);
	290	if (r < 0)
9fd0b029	291	return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);
217f95db WC	292
	293	return 0;
	294	}
	295
2b3e18de	296	#endif
ffbd2c4d	297
8a188de9	298	int mac_smack_setup(bool *loaded_policy) {
2b3e18de	299
f9fa32f0	300	#if ENABLE_SMACK
2b3e18de	301
a4783bd1 ZJS	302	int r;
a4783bd1 ZJS	303
e49d3c01 ŁS	304	assert(loaded_policy);
e49d3c01 ŁS	305
6656aefb	306	r = write_access2_rules("/etc/smack/accesses.d/");
79893116	307	switch (r) {
a4783bd1 ZJS	308	case -ENOENT:
	309	log_debug("Smack is not enabled in the kernel.");
	310	return 0;
	311	case ENOENT:
6656aefb	312	log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
a4783bd1 ZJS	313	return 0;
	314	case 0:
	315	log_info("Successfully loaded Smack policies.");
abbacb1d NC	316	break;
abbacb1d NC	317	default:
e53fc357	318	log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
abbacb1d NC	319	return 0;
	320	}
	321
07b382cc	322	#if HAVE_SMACK_RUN_LABEL
57512c89	323	r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	324	if (r < 0)
ae176752 CS	325	log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
57512c89	326	r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	327	if (r < 0)
	328	log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
	329	r = write_string_file("/sys/fs/smackfs/netlabel",
57512c89	330	"0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	331	if (r < 0)
ae176752 CS	332	log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
57512c89	333	r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	334	if (r < 0)
ae176752 CS	335	log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
8b197c3a AK	336	#endif
8b197c3a AK	337
6656aefb	338	r = write_cipso2_rules("/etc/smack/cipso.d/");
79893116	339	switch (r) {
abbacb1d NC	340	case -ENOENT:
	341	log_debug("Smack/CIPSO is not enabled in the kernel.");
	342	return 0;
	343	case ENOENT:
6656aefb	344	log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
ae176752	345	break;
abbacb1d NC	346	case 0:
abbacb1d NC	347	log_info("Successfully loaded Smack/CIPSO policies.");
b9289d4c	348	break;
a4783bd1	349	default:
e53fc357	350	log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
ae176752 CS	351	break;
	352	}
	353
	354	r = write_netlabel_rules("/etc/smack/netlabel.d/");
79893116	355	switch (r) {
ae176752 CS	356	case -ENOENT:
ae176752 CS	357	log_debug("Smack/CIPSO is not enabled in the kernel.");
a4783bd1	358	return 0;
ae176752 CS	359	case ENOENT:
	360	log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
	361	break;
	362	case 0:
	363	log_info("Successfully loaded Smack network host rules.");
	364	break;
	365	default:
	366	log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
	367	break;
a4783bd1	368	}
2b3e18de	369
217f95db	370	r = write_onlycap_list();
79893116	371	switch (r) {
217f95db WC	372	case -ENOENT:
	373	log_debug("Smack is not enabled in the kernel.");
	374	break;
	375	case ENOENT:
	376	log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
	377	break;
	378	case 0:
	379	log_info("Successfully wrote Smack onlycap list.");
	380	break;
	381	default:
d85ff944	382	return log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	383	}
217f95db WC	384
e49d3c01 ŁS	385	*loaded_policy = true;
e49d3c01 ŁS	386
2b3e18de KL	387	#endif
	388
	389	return 0;
ffbd2c4d	390	}