[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 <stdio_ext.h>
#include <stdlib.h>
#include <string.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 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;
        int 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) {
                int fd;
                _cleanup_fclose_ FILE *policy = NULL;

                if (!dirent_is_file(entry))
                        continue;

                fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
                if (fd < 0) {
                        if (r == 0)
                                r = -errno;
                        log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name);
                        continue;
                }

                policy = fdopen(fd, "r");
                if (!policy) {
                        if (r == 0)
                                r = -errno;
                        safe_close(fd);
                        log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
                        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;
        int 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) {
                int fd;
                _cleanup_fclose_ FILE *policy = NULL;

                if (!dirent_is_file(entry))
                        continue;

                fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
                if (fd < 0) {
                        if (r == 0)
                                r = -errno;
                        log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
                        continue;
                }

                policy = fdopen(fd, "r");
                if (!policy) {
                        if (r == 0)
                                r = -errno;
                        safe_close(fd);
                        log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
                        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;
        int 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) {
                int fd;
                _cleanup_fclose_ FILE *policy = NULL;

                fd = openat(dfd, entry->d_name, O_RDONLY|O_CLOEXEC);
                if (fd < 0) {
                        if (r == 0)
                                r = -errno;
                        log_warning_errno(errno, "Failed to open %s: %m", entry->d_name);
                        continue;
                }

                policy = fdopen(fd, "r");
                if (!policy) {
                        if (r == 0)
                                r = -errno;
                        safe_close(fd);
                        log_error_errno(errno, "Failed to open %s: %m", entry->d_name);
                        continue;
                }

                (void) __fsetlocking(policy, FSETLOCKING_BYCALLER);

                /* 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	11	#include <stdio.h>
0d536673	12	#include <stdio_ext.h>
07630cea LP	13	#include <stdlib.h>
07630cea LP	14	#include <string.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
6656aefb WC	28	static int write_access2_rules(const char* srcdir) {
6656aefb WC	29	_cleanup_close_ int load2_fd = -1, change_fd = -1;
ffbd2c4d NC	30	_cleanup_closedir_ DIR *dir = NULL;
ffbd2c4d NC	31	struct dirent *entry;
ffbd2c4d	32	int dfd = -1;
a4783bd1	33	int r = 0;
ffbd2c4d	34
6656aefb WC	35	load2_fd = open("/sys/fs/smackfs/load2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	36	if (load2_fd < 0) {
	37	if (errno != ENOENT)
	38	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
	39	return -errno; /* negative error */
	40	}
	41
	42	change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	43	if (change_fd < 0) {
a4783bd1	44	if (errno != ENOENT)
6656aefb	45	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
a4783bd1	46	return -errno; /* negative error */
ffbd2c4d NC	47	}
ffbd2c4d NC	48
6656aefb	49	/* write rules to load2 or change-rule from every file in the directory */
a4783bd1	50	dir = opendir(srcdir);
ffbd2c4d	51	if (!dir) {
a4783bd1	52	if (errno != ENOENT)
6656aefb	53	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
a4783bd1	54	return errno; /* positive on purpose */
ffbd2c4d NC	55	}
	56
	57	dfd = dirfd(dir);
fea7838e	58	assert(dfd >= 0);
ffbd2c4d NC	59
ffbd2c4d NC	60	FOREACH_DIRENT(entry, dir, return 0) {
a4783bd1	61	int fd;
ffbd2c4d	62	_cleanup_fclose_ FILE *policy = NULL;
ffbd2c4d	63
6656aefb WC	64	if (!dirent_is_file(entry))
	65	continue;
	66
a4783bd1 ZJS	67	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	68	if (fd < 0) {
	69	if (r == 0)
	70	r = -errno;
6656aefb	71	log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name);
ffbd2c4d NC	72	continue;
	73	}
	74
e92aaed3	75	policy = fdopen(fd, "r");
ffbd2c4d	76	if (!policy) {
a4783bd1 ZJS	77	if (r == 0)
a4783bd1 ZJS	78	r = -errno;
03e334a1	79	safe_close(fd);
6656aefb	80	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
ffbd2c4d NC	81	continue;
	82	}
	83
ffbd2c4d	84	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	85	for (;;) {
	86	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	87	int q;
6656aefb	88
ea8b6526 LP	89	q = read_line(policy, NAME_MAX, &buf);
	90	if (q < 0)
	91	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	92	if (q == 0)
	93	break;
6656aefb	94
ea8b6526	95	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	96	continue;
	97
	98	/* if 3 args -> load rule : subject object access1 */
	99	/* if 4 args -> change rule : subject object access1 access2 */
	100	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	101	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	102	continue;
	103	}
	104
	105	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	106	if (r == 0)
6656aefb	107	r = -errno;
5e1ee764	108	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	109	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	110	}
6656aefb WC	111	}
	112	}
	113
	114	return r;
	115	}
	116
	117	static int write_cipso2_rules(const char* srcdir) {
	118	_cleanup_close_ int cipso2_fd = -1;
	119	_cleanup_closedir_ DIR *dir = NULL;
	120	struct dirent *entry;
6656aefb WC	121	int dfd = -1;
	122	int r = 0;
	123
	124	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	125	if (cipso2_fd < 0) {
	126	if (errno != ENOENT)
	127	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	128	return -errno; /* negative error */
	129	}
	130
	131	/* write rules to cipso2 from every file in the directory */
	132	dir = opendir(srcdir);
	133	if (!dir) {
	134	if (errno != ENOENT)
	135	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	136	return errno; /* positive on purpose */
	137	}
	138
	139	dfd = dirfd(dir);
	140	assert(dfd >= 0);
	141
	142	FOREACH_DIRENT(entry, dir, return 0) {
	143	int fd;
	144	_cleanup_fclose_ FILE *policy = NULL;
	145
	146	if (!dirent_is_file(entry))
	147	continue;
	148
	149	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	150	if (fd < 0) {
	151	if (r == 0)
	152	r = -errno;
	153	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
	154	continue;
	155	}
	156
e92aaed3	157	policy = fdopen(fd, "r");
6656aefb WC	158	if (!policy) {
	159	if (r == 0)
	160	r = -errno;
	161	safe_close(fd);
	162	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
	163	continue;
	164	}
	165
	166	/* cipso2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	167	for (;;) {
	168	_cleanup_free_ char *buf = NULL;
	169	int q;
	170
	171	q = read_line(policy, NAME_MAX, &buf);
	172	if (q < 0)
	173	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	174	if (q == 0)
	175	break;
6656aefb	176
ea8b6526	177	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	178	continue;
	179
	180	if (write(cipso2_fd, buf, strlen(buf)) < 0) {
a4783bd1 ZJS	181	if (r == 0)
a4783bd1 ZJS	182	r = -errno;
5e1ee764	183	log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
6656aefb	184	buf, entry->d_name);
a4783bd1 ZJS	185	break;
a4783bd1 ZJS	186	}
ffbd2c4d NC	187	}
	188	}
	189
6656aefb	190	return r;
a4783bd1 ZJS	191	}
a4783bd1 ZJS	192
ae176752 CS	193	static int write_netlabel_rules(const char* srcdir) {
	194	_cleanup_fclose_ FILE *dst = NULL;
	195	_cleanup_closedir_ DIR *dir = NULL;
	196	struct dirent *entry;
ae176752 CS	197	int dfd = -1;
	198	int r = 0;
	199
	200	dst = fopen("/sys/fs/smackfs/netlabel", "we");
	201	if (!dst) {
	202	if (errno != ENOENT)
	203	log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
	204	return -errno; /* negative error */
	205	}
	206
	207	/* write rules to dst from every file in the directory */
	208	dir = opendir(srcdir);
	209	if (!dir) {
	210	if (errno != ENOENT)
	211	log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
	212	return errno; /* positive on purpose */
	213	}
	214
	215	dfd = dirfd(dir);
	216	assert(dfd >= 0);
	217
	218	FOREACH_DIRENT(entry, dir, return 0) {
	219	int fd;
	220	_cleanup_fclose_ FILE *policy = NULL;
	221
	222	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	223	if (fd < 0) {
	224	if (r == 0)
	225	r = -errno;
	226	log_warning_errno(errno, "Failed to open %s: %m", entry->d_name);
	227	continue;
	228	}
	229
e92aaed3	230	policy = fdopen(fd, "r");
ae176752 CS	231	if (!policy) {
	232	if (r == 0)
	233	r = -errno;
	234	safe_close(fd);
	235	log_error_errno(errno, "Failed to open %s: %m", entry->d_name);
	236	continue;
	237	}
	238
0d536673 LP	239	(void) __fsetlocking(policy, FSETLOCKING_BYCALLER);
0d536673 LP	240
ae176752	241	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	242	for (;;) {
ea8b6526 LP	243	_cleanup_free_ char *buf = NULL;
0d536673 LP	244	int q;
0d536673 LP	245
ea8b6526 LP	246	q = read_line(policy, NAME_MAX, &buf);
	247	if (q < 0)
	248	return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
	249	if (q == 0)
	250	break;
	251
0d536673	252	if (!fputs(buf, dst)) {
ae176752 CS	253	if (r == 0)
ae176752 CS	254	r = -EINVAL;
5e1ee764	255	log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	256	break;
ae176752 CS	257	}
0d536673 LP	258	q = fflush_and_check(dst);
0d536673 LP	259	if (q < 0) {
ae176752	260	if (r == 0)
0d536673 LP	261	r = q;
0d536673 LP	262	log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	263	break;
	264	}
	265	}
	266	}
	267
7f508f2c	268	return r;
ae176752 CS	269	}
ae176752 CS	270
217f95db WC	271	static int write_onlycap_list(void) {
	272	_cleanup_close_ int onlycap_fd = -1;
	273	_cleanup_free_ char *list = NULL;
	274	_cleanup_fclose_ FILE *f = NULL;
	275	size_t len = 0, allocated = 0;
217f95db WC	276	int r;
	277
	278	f = fopen("/etc/smack/onlycap", "re");
	279	if (!f) {
	280	if (errno != ENOENT)
9fd0b029 LP	281	log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");
9fd0b029 LP	282
217f95db WC	283	return errno == ENOENT ? ENOENT : -errno;
	284	}
	285
ea8b6526 LP	286	for (;;) {
ea8b6526 LP	287	_cleanup_free_ char *buf = NULL;
217f95db WC	288	size_t l;
217f95db WC	289
ea8b6526 LP	290	r = read_line(f, LONG_LINE_MAX, &buf);
	291	if (r < 0)
	292	return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
	293	if (r == 0)
	294	break;
	295
	296	if (isempty(buf) \|\| strchr(COMMENTS, *buf))
217f95db WC	297	continue;
	298
	299	l = strlen(buf);
	300	if (!GREEDY_REALLOC(list, allocated, len + l + 1))
	301	return log_oom();
	302
	303	stpcpy(list + len, buf)[0] = ' ';
	304	len += l + 1;
	305	}
	306
9fd0b029	307	if (len == 0)
217f95db WC	308	return 0;
	309
	310	list[len - 1] = 0;
	311
	312	onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	313	if (onlycap_fd < 0) {
	314	if (errno != ENOENT)
9fd0b029	315	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
217f95db WC	316	return -errno; /* negative error */
	317	}
	318
	319	r = write(onlycap_fd, list, len);
	320	if (r < 0)
9fd0b029	321	return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);
217f95db WC	322
	323	return 0;
	324	}
	325
2b3e18de	326	#endif
ffbd2c4d	327
8a188de9	328	int mac_smack_setup(bool *loaded_policy) {
2b3e18de	329
f9fa32f0	330	#if ENABLE_SMACK
2b3e18de	331
a4783bd1 ZJS	332	int r;
a4783bd1 ZJS	333
e49d3c01 ŁS	334	assert(loaded_policy);
e49d3c01 ŁS	335
6656aefb	336	r = write_access2_rules("/etc/smack/accesses.d/");
a4783bd1 ZJS	337	switch(r) {
	338	case -ENOENT:
	339	log_debug("Smack is not enabled in the kernel.");
	340	return 0;
	341	case ENOENT:
6656aefb	342	log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
a4783bd1 ZJS	343	return 0;
	344	case 0:
	345	log_info("Successfully loaded Smack policies.");
abbacb1d NC	346	break;
abbacb1d NC	347	default:
e53fc357	348	log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
abbacb1d NC	349	return 0;
	350	}
	351
8b197c3a	352	#ifdef SMACK_RUN_LABEL
57512c89	353	r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	354	if (r < 0)
ae176752 CS	355	log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
57512c89	356	r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	357	if (r < 0)
	358	log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
	359	r = write_string_file("/sys/fs/smackfs/netlabel",
57512c89	360	"0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	361	if (r < 0)
ae176752 CS	362	log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
57512c89	363	r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	364	if (r < 0)
ae176752 CS	365	log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
8b197c3a AK	366	#endif
8b197c3a AK	367
6656aefb	368	r = write_cipso2_rules("/etc/smack/cipso.d/");
abbacb1d NC	369	switch(r) {
	370	case -ENOENT:
	371	log_debug("Smack/CIPSO is not enabled in the kernel.");
	372	return 0;
	373	case ENOENT:
6656aefb	374	log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
ae176752	375	break;
abbacb1d NC	376	case 0:
abbacb1d NC	377	log_info("Successfully loaded Smack/CIPSO policies.");
b9289d4c	378	break;
a4783bd1	379	default:
e53fc357	380	log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
ae176752 CS	381	break;
	382	}
	383
	384	r = write_netlabel_rules("/etc/smack/netlabel.d/");
	385	switch(r) {
	386	case -ENOENT:
	387	log_debug("Smack/CIPSO is not enabled in the kernel.");
a4783bd1	388	return 0;
ae176752 CS	389	case ENOENT:
	390	log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
	391	break;
	392	case 0:
	393	log_info("Successfully loaded Smack network host rules.");
	394	break;
	395	default:
	396	log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
	397	break;
a4783bd1	398	}
2b3e18de	399
217f95db WC	400	r = write_onlycap_list();
	401	switch(r) {
	402	case -ENOENT:
	403	log_debug("Smack is not enabled in the kernel.");
	404	break;
	405	case ENOENT:
	406	log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
	407	break;
	408	case 0:
	409	log_info("Successfully wrote Smack onlycap list.");
	410	break;
	411	default:
5e1ee764	412	log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	413	return r;
	414	}
	415
e49d3c01 ŁS	416	*loaded_policy = true;
e49d3c01 ŁS	417
2b3e18de KL	418	#endif
	419
	420	return 0;
ffbd2c4d	421	}