[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;

                dirent_ensure_type(dir, entry);
                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;

                dirent_ensure_type(dir, entry);
                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, allocated = 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, allocated, 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
28e68bb2	85	dirent_ensure_type(dir, entry);
6656aefb WC	86	if (!dirent_is_file(entry))
	87	continue;
	88
b636d78a	89	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ffbd2c4d	90	continue;
ffbd2c4d	91
ffbd2c4d	92	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	93	for (;;) {
	94	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	95	int q;
6656aefb	96
ea8b6526 LP	97	q = read_line(policy, NAME_MAX, &buf);
	98	if (q < 0)
	99	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	100	if (q == 0)
	101	break;
6656aefb	102
ea8b6526	103	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	104	continue;
	105
	106	/* if 3 args -> load rule : subject object access1 */
	107	/* if 4 args -> change rule : subject object access1 access2 */
	108	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	109	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	110	continue;
	111	}
	112
	113	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	114	if (r == 0)
6656aefb	115	r = -errno;
5e1ee764	116	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	117	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	118	}
6656aefb WC	119	}
	120	}
	121
	122	return r;
	123	}
	124
b636d78a	125	static int write_cipso2_rules(const char *srcdir) {
6656aefb WC	126	_cleanup_close_ int cipso2_fd = -1;
	127	_cleanup_closedir_ DIR *dir = NULL;
	128	struct dirent *entry;
b636d78a	129	int dfd = -1, r = 0;
6656aefb WC	130
	131	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	132	if (cipso2_fd < 0) {
	133	if (errno != ENOENT)
	134	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	135	return -errno; /* negative error */
	136	}
	137
	138	/* write rules to cipso2 from every file in the directory */
	139	dir = opendir(srcdir);
	140	if (!dir) {
	141	if (errno != ENOENT)
	142	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	143	return errno; /* positive on purpose */
	144	}
	145
	146	dfd = dirfd(dir);
	147	assert(dfd >= 0);
	148
	149	FOREACH_DIRENT(entry, dir, return 0) {
6656aefb WC	150	_cleanup_fclose_ FILE *policy = NULL;
6656aefb WC	151
28e68bb2	152	dirent_ensure_type(dir, entry);
6656aefb WC	153	if (!dirent_is_file(entry))
	154	continue;
	155
b636d78a	156	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
6656aefb	157	continue;
6656aefb WC	158
6656aefb WC	159	/* cipso2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	160	for (;;) {
	161	_cleanup_free_ char *buf = NULL;
	162	int q;
	163
	164	q = read_line(policy, NAME_MAX, &buf);
	165	if (q < 0)
	166	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	167	if (q == 0)
	168	break;
6656aefb	169
ea8b6526	170	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	171	continue;
	172
	173	if (write(cipso2_fd, buf, strlen(buf)) < 0) {
a4783bd1 ZJS	174	if (r == 0)
a4783bd1 ZJS	175	r = -errno;
5e1ee764	176	log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
6656aefb	177	buf, entry->d_name);
a4783bd1 ZJS	178	break;
a4783bd1 ZJS	179	}
ffbd2c4d NC	180	}
	181	}
	182
6656aefb	183	return r;
a4783bd1 ZJS	184	}
a4783bd1 ZJS	185
b636d78a	186	static int write_netlabel_rules(const char *srcdir) {
ae176752 CS	187	_cleanup_fclose_ FILE *dst = NULL;
	188	_cleanup_closedir_ DIR *dir = NULL;
	189	struct dirent *entry;
b636d78a	190	int dfd = -1, r = 0;
ae176752 CS	191
	192	dst = fopen("/sys/fs/smackfs/netlabel", "we");
	193	if (!dst) {
	194	if (errno != ENOENT)
	195	log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
	196	return -errno; /* negative error */
	197	}
	198
	199	/* write rules to dst from every file in the directory */
	200	dir = opendir(srcdir);
	201	if (!dir) {
	202	if (errno != ENOENT)
	203	log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
	204	return errno; /* positive on purpose */
	205	}
	206
	207	dfd = dirfd(dir);
	208	assert(dfd >= 0);
	209
	210	FOREACH_DIRENT(entry, dir, return 0) {
ae176752 CS	211	_cleanup_fclose_ FILE *policy = NULL;
ae176752 CS	212
b636d78a	213	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ae176752	214	continue;
0d536673	215
ae176752	216	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	217	for (;;) {
ea8b6526 LP	218	_cleanup_free_ char *buf = NULL;
0d536673 LP	219	int q;
0d536673 LP	220
ea8b6526 LP	221	q = read_line(policy, NAME_MAX, &buf);
	222	if (q < 0)
	223	return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
	224	if (q == 0)
	225	break;
	226
0d536673	227	if (!fputs(buf, dst)) {
ae176752 CS	228	if (r == 0)
ae176752 CS	229	r = -EINVAL;
5e1ee764	230	log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	231	break;
ae176752 CS	232	}
0d536673 LP	233	q = fflush_and_check(dst);
0d536673 LP	234	if (q < 0) {
ae176752	235	if (r == 0)
0d536673 LP	236	r = q;
0d536673 LP	237	log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	238	break;
	239	}
	240	}
	241	}
	242
7f508f2c	243	return r;
ae176752 CS	244	}
ae176752 CS	245
217f95db WC	246	static int write_onlycap_list(void) {
	247	_cleanup_close_ int onlycap_fd = -1;
	248	_cleanup_free_ char *list = NULL;
	249	_cleanup_fclose_ FILE *f = NULL;
	250	size_t len = 0, allocated = 0;
217f95db WC	251	int r;
	252
	253	f = fopen("/etc/smack/onlycap", "re");
	254	if (!f) {
	255	if (errno != ENOENT)
9fd0b029 LP	256	log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");
9fd0b029 LP	257
217f95db WC	258	return errno == ENOENT ? ENOENT : -errno;
	259	}
	260
ea8b6526 LP	261	for (;;) {
ea8b6526 LP	262	_cleanup_free_ char *buf = NULL;
217f95db WC	263	size_t l;
217f95db WC	264
ea8b6526 LP	265	r = read_line(f, LONG_LINE_MAX, &buf);
	266	if (r < 0)
	267	return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
	268	if (r == 0)
	269	break;
	270
	271	if (isempty(buf) \|\| strchr(COMMENTS, *buf))
217f95db WC	272	continue;
	273
	274	l = strlen(buf);
	275	if (!GREEDY_REALLOC(list, allocated, len + l + 1))
	276	return log_oom();
	277
	278	stpcpy(list + len, buf)[0] = ' ';
	279	len += l + 1;
	280	}
	281
9fd0b029	282	if (len == 0)
217f95db WC	283	return 0;
	284
	285	list[len - 1] = 0;
	286
	287	onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	288	if (onlycap_fd < 0) {
	289	if (errno != ENOENT)
9fd0b029	290	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
217f95db WC	291	return -errno; /* negative error */
	292	}
	293
	294	r = write(onlycap_fd, list, len);
	295	if (r < 0)
9fd0b029	296	return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);
217f95db WC	297
	298	return 0;
	299	}
	300
2b3e18de	301	#endif
ffbd2c4d	302
8a188de9	303	int mac_smack_setup(bool *loaded_policy) {
2b3e18de	304
f9fa32f0	305	#if ENABLE_SMACK
2b3e18de	306
a4783bd1 ZJS	307	int r;
a4783bd1 ZJS	308
e49d3c01 ŁS	309	assert(loaded_policy);
e49d3c01 ŁS	310
6656aefb	311	r = write_access2_rules("/etc/smack/accesses.d/");
a4783bd1 ZJS	312	switch(r) {
	313	case -ENOENT:
	314	log_debug("Smack is not enabled in the kernel.");
	315	return 0;
	316	case ENOENT:
6656aefb	317	log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
a4783bd1 ZJS	318	return 0;
	319	case 0:
	320	log_info("Successfully loaded Smack policies.");
abbacb1d NC	321	break;
abbacb1d NC	322	default:
e53fc357	323	log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
abbacb1d NC	324	return 0;
	325	}
	326
8b197c3a	327	#ifdef SMACK_RUN_LABEL
57512c89	328	r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	329	if (r < 0)
ae176752 CS	330	log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
57512c89	331	r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	332	if (r < 0)
	333	log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
	334	r = write_string_file("/sys/fs/smackfs/netlabel",
57512c89	335	"0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	336	if (r < 0)
ae176752 CS	337	log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
57512c89	338	r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	339	if (r < 0)
ae176752 CS	340	log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
8b197c3a AK	341	#endif
8b197c3a AK	342
6656aefb	343	r = write_cipso2_rules("/etc/smack/cipso.d/");
abbacb1d NC	344	switch(r) {
	345	case -ENOENT:
	346	log_debug("Smack/CIPSO is not enabled in the kernel.");
	347	return 0;
	348	case ENOENT:
6656aefb	349	log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
ae176752	350	break;
abbacb1d NC	351	case 0:
abbacb1d NC	352	log_info("Successfully loaded Smack/CIPSO policies.");
b9289d4c	353	break;
a4783bd1	354	default:
e53fc357	355	log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
ae176752 CS	356	break;
	357	}
	358
	359	r = write_netlabel_rules("/etc/smack/netlabel.d/");
	360	switch(r) {
	361	case -ENOENT:
	362	log_debug("Smack/CIPSO is not enabled in the kernel.");
a4783bd1	363	return 0;
ae176752 CS	364	case ENOENT:
	365	log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
	366	break;
	367	case 0:
	368	log_info("Successfully loaded Smack network host rules.");
	369	break;
	370	default:
	371	log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
	372	break;
a4783bd1	373	}
2b3e18de	374
217f95db WC	375	r = write_onlycap_list();
	376	switch(r) {
	377	case -ENOENT:
	378	log_debug("Smack is not enabled in the kernel.");
	379	break;
	380	case ENOENT:
	381	log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
	382	break;
	383	case 0:
	384	log_info("Successfully wrote Smack onlycap list.");
	385	break;
	386	default:
d85ff944	387	return log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	388	}
217f95db WC	389
e49d3c01 ŁS	390	*loaded_policy = true;
e49d3c01 ŁS	391
2b3e18de KL	392	#endif
	393
	394	return 0;
ffbd2c4d	395	}