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

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

#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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, 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:
                log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
                return r;
        }

        *loaded_policy = true;

#endif

        return 0;
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
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
07630cea	8	#include <dirent.h>
ffbd2c4d	9	#include <errno.h>
ffbd2c4d	10	#include <fcntl.h>
07630cea LP	11	#include <stdio.h>
	12	#include <stdlib.h>
	13	#include <string.h>
ca78ad1d	14	#include <unistd.h>
ffbd2c4d	15
b5efdb8a	16	#include "alloc-util.h"
a0956174	17	#include "dirent-util.h"
3ffd4af2	18	#include "fd-util.h"
8b197c3a	19	#include "fileio.h"
ffbd2c4d	20	#include "log.h"
07630cea	21	#include "macro.h"
3ffd4af2	22	#include "smack-setup.h"
07630cea LP	23	#include "string-util.h"
07630cea LP	24	#include "util.h"
ffbd2c4d	25
f9fa32f0	26	#if ENABLE_SMACK
2b3e18de	27
b636d78a ZJS	28	static int fdopen_unlocked_at(int dfd, const char dir, const char name, int status, FILE *ret_file) {
	29	int fd, r;
	30	FILE *f;
	31
	32	fd = openat(dfd, name, O_RDONLY\|O_CLOEXEC);
	33	if (fd < 0) {
	34	if (*status == 0)
	35	*status = -errno;
	36
	37	return log_warning_errno(errno, "Failed to open \"%s/%s\": %m", dir, name);
	38	}
	39
	40	r = fdopen_unlocked(fd, "r", &f);
	41	if (r < 0) {
	42	if (*status == 0)
	43	*status = r;
	44
	45	safe_close(fd);
	46	return log_error_errno(r, "Failed to open \"%s/%s\": %m", dir, name);
	47	}
	48
	49	*ret_file = f;
	50	return 0;
	51	}
	52
	53	static int write_access2_rules(const char *srcdir) {
6656aefb	54	_cleanup_close_ int load2_fd = -1, change_fd = -1;
ffbd2c4d NC	55	_cleanup_closedir_ DIR *dir = NULL;
ffbd2c4d NC	56	struct dirent *entry;
b636d78a	57	int dfd = -1, r = 0;
ffbd2c4d	58
6656aefb WC	59	load2_fd = open("/sys/fs/smackfs/load2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	60	if (load2_fd < 0) {
	61	if (errno != ENOENT)
	62	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
	63	return -errno; /* negative error */
	64	}
	65
	66	change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	67	if (change_fd < 0) {
a4783bd1	68	if (errno != ENOENT)
6656aefb	69	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
a4783bd1	70	return -errno; /* negative error */
ffbd2c4d NC	71	}
ffbd2c4d NC	72
6656aefb	73	/* write rules to load2 or change-rule from every file in the directory */
a4783bd1	74	dir = opendir(srcdir);
ffbd2c4d	75	if (!dir) {
a4783bd1	76	if (errno != ENOENT)
6656aefb	77	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
a4783bd1	78	return errno; /* positive on purpose */
ffbd2c4d NC	79	}
	80
	81	dfd = dirfd(dir);
fea7838e	82	assert(dfd >= 0);
ffbd2c4d NC	83
	84	FOREACH_DIRENT(entry, dir, return 0) {
	85	_cleanup_fclose_ FILE *policy = NULL;
ffbd2c4d	86
6656aefb WC	87	if (!dirent_is_file(entry))
	88	continue;
	89
b636d78a	90	if (fdopen_unlocked_at(dfd, srcdir, entry->d_name, &r, &policy) < 0)
ffbd2c4d	91	continue;
ffbd2c4d	92
ffbd2c4d	93	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	94	for (;;) {
	95	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	96	int q;
6656aefb	97
ea8b6526 LP	98	q = read_line(policy, NAME_MAX, &buf);
	99	if (q < 0)
	100	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	101	if (q == 0)
	102	break;
6656aefb	103
ea8b6526	104	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	105	continue;
	106
	107	/* if 3 args -> load rule : subject object access1 */
	108	/* if 4 args -> change rule : subject object access1 access2 */
	109	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	110	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	111	continue;
	112	}
	113
	114	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	115	if (r == 0)
6656aefb	116	r = -errno;
5e1ee764	117	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	118	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	119	}
6656aefb WC	120	}
	121	}
	122
	123	return r;
	124	}
	125
b636d78a	126	static int write_cipso2_rules(const char *srcdir) {
6656aefb WC	127	_cleanup_close_ int cipso2_fd = -1;
	128	_cleanup_closedir_ DIR *dir = NULL;
	129	struct dirent *entry;
b636d78a	130	int dfd = -1, r = 0;
6656aefb WC	131
	132	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	133	if (cipso2_fd < 0) {
	134	if (errno != ENOENT)
	135	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	136	return -errno; /* negative error */
	137	}
	138
	139	/* write rules to cipso2 from every file in the directory */
	140	dir = opendir(srcdir);
	141	if (!dir) {
	142	if (errno != ENOENT)
	143	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	144	return errno; /* positive on purpose */
	145	}
	146
	147	dfd = dirfd(dir);
	148	assert(dfd >= 0);
	149
	150	FOREACH_DIRENT(entry, dir, return 0) {
6656aefb WC	151	_cleanup_fclose_ FILE *policy = NULL;
	152
	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:
5e1ee764	387	log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	388	return r;
	389	}
	390
e49d3c01 ŁS	391	*loaded_policy = true;
e49d3c01 ŁS	392
2b3e18de KL	393	#endif
	394
	395	return 0;
ffbd2c4d	396	}