[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 <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 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>
ca78ad1d	15	#include <unistd.h>
ffbd2c4d	16
b5efdb8a	17	#include "alloc-util.h"
a0956174	18	#include "dirent-util.h"
3ffd4af2	19	#include "fd-util.h"
8b197c3a	20	#include "fileio.h"
ffbd2c4d	21	#include "log.h"
07630cea	22	#include "macro.h"
3ffd4af2	23	#include "smack-setup.h"
07630cea LP	24	#include "string-util.h"
07630cea LP	25	#include "util.h"
ffbd2c4d	26
f9fa32f0	27	#if ENABLE_SMACK
2b3e18de	28
6656aefb WC	29	static int write_access2_rules(const char* srcdir) {
6656aefb WC	30	_cleanup_close_ int load2_fd = -1, change_fd = -1;
ffbd2c4d NC	31	_cleanup_closedir_ DIR *dir = NULL;
ffbd2c4d NC	32	struct dirent *entry;
ffbd2c4d	33	int dfd = -1;
a4783bd1	34	int r = 0;
ffbd2c4d	35
6656aefb WC	36	load2_fd = open("/sys/fs/smackfs/load2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	37	if (load2_fd < 0) {
	38	if (errno != ENOENT)
	39	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/load2': %m");
	40	return -errno; /* negative error */
	41	}
	42
	43	change_fd = open("/sys/fs/smackfs/change-rule", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	44	if (change_fd < 0) {
a4783bd1	45	if (errno != ENOENT)
6656aefb	46	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/change-rule': %m");
a4783bd1	47	return -errno; /* negative error */
ffbd2c4d NC	48	}
ffbd2c4d NC	49
6656aefb	50	/* write rules to load2 or change-rule from every file in the directory */
a4783bd1	51	dir = opendir(srcdir);
ffbd2c4d	52	if (!dir) {
a4783bd1	53	if (errno != ENOENT)
6656aefb	54	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
a4783bd1	55	return errno; /* positive on purpose */
ffbd2c4d NC	56	}
	57
	58	dfd = dirfd(dir);
fea7838e	59	assert(dfd >= 0);
ffbd2c4d NC	60
ffbd2c4d NC	61	FOREACH_DIRENT(entry, dir, return 0) {
a4783bd1	62	int fd;
ffbd2c4d	63	_cleanup_fclose_ FILE *policy = NULL;
ffbd2c4d	64
6656aefb WC	65	if (!dirent_is_file(entry))
	66	continue;
	67
a4783bd1 ZJS	68	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	69	if (fd < 0) {
	70	if (r == 0)
	71	r = -errno;
6656aefb	72	log_warning_errno(errno, "Failed to open '%s': %m", entry->d_name);
ffbd2c4d NC	73	continue;
	74	}
	75
e92aaed3	76	policy = fdopen(fd, "r");
ffbd2c4d	77	if (!policy) {
a4783bd1 ZJS	78	if (r == 0)
a4783bd1 ZJS	79	r = -errno;
03e334a1	80	safe_close(fd);
6656aefb	81	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
ffbd2c4d NC	82	continue;
	83	}
	84
ffbd2c4d	85	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	86	for (;;) {
	87	_cleanup_free_ char buf = NULL, sbj = NULL, obj = NULL, acc1 = NULL, *acc2 = NULL;
	88	int q;
6656aefb	89
ea8b6526 LP	90	q = read_line(policy, NAME_MAX, &buf);
	91	if (q < 0)
	92	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	93	if (q == 0)
	94	break;
6656aefb	95
ea8b6526	96	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	97	continue;
	98
	99	/* if 3 args -> load rule : subject object access1 */
	100	/* if 4 args -> change rule : subject object access1 access2 */
	101	if (sscanf(buf, "%ms %ms %ms %ms", &sbj, &obj, &acc1, &acc2) < 3) {
	102	log_error_errno(errno, "Failed to parse rule '%s' in '%s', ignoring.", buf, entry->d_name);
	103	continue;
	104	}
	105
	106	if (write(isempty(acc2) ? load2_fd : change_fd, buf, strlen(buf)) < 0) {
a4783bd1	107	if (r == 0)
6656aefb	108	r = -errno;
5e1ee764	109	log_error_errno(errno, "Failed to write '%s' to '%s' in '%s': %m",
6656aefb	110	buf, isempty(acc2) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry->d_name);
a4783bd1	111	}
6656aefb WC	112	}
	113	}
	114
	115	return r;
	116	}
	117
	118	static int write_cipso2_rules(const char* srcdir) {
	119	_cleanup_close_ int cipso2_fd = -1;
	120	_cleanup_closedir_ DIR *dir = NULL;
	121	struct dirent *entry;
6656aefb WC	122	int dfd = -1;
	123	int r = 0;
	124
	125	cipso2_fd = open("/sys/fs/smackfs/cipso2", O_RDWR\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	126	if (cipso2_fd < 0) {
	127	if (errno != ENOENT)
	128	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/cipso2': %m");
	129	return -errno; /* negative error */
	130	}
	131
	132	/* write rules to cipso2 from every file in the directory */
	133	dir = opendir(srcdir);
	134	if (!dir) {
	135	if (errno != ENOENT)
	136	log_warning_errno(errno, "Failed to opendir '%s': %m", srcdir);
	137	return errno; /* positive on purpose */
	138	}
	139
	140	dfd = dirfd(dir);
	141	assert(dfd >= 0);
	142
	143	FOREACH_DIRENT(entry, dir, return 0) {
	144	int fd;
	145	_cleanup_fclose_ FILE *policy = NULL;
	146
	147	if (!dirent_is_file(entry))
	148	continue;
	149
	150	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	151	if (fd < 0) {
	152	if (r == 0)
	153	r = -errno;
	154	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
	155	continue;
	156	}
	157
e92aaed3	158	policy = fdopen(fd, "r");
6656aefb WC	159	if (!policy) {
	160	if (r == 0)
	161	r = -errno;
	162	safe_close(fd);
	163	log_error_errno(errno, "Failed to open '%s': %m", entry->d_name);
	164	continue;
	165	}
	166
	167	/* cipso2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	168	for (;;) {
	169	_cleanup_free_ char *buf = NULL;
	170	int q;
	171
	172	q = read_line(policy, NAME_MAX, &buf);
	173	if (q < 0)
	174	return log_error_errno(q, "Failed to read line from '%s': %m", entry->d_name);
	175	if (q == 0)
	176	break;
6656aefb	177
ea8b6526	178	if (isempty(buf) \|\| strchr(COMMENTS, buf[0]))
6656aefb WC	179	continue;
	180
	181	if (write(cipso2_fd, buf, strlen(buf)) < 0) {
a4783bd1 ZJS	182	if (r == 0)
a4783bd1 ZJS	183	r = -errno;
5e1ee764	184	log_error_errno(errno, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
6656aefb	185	buf, entry->d_name);
a4783bd1 ZJS	186	break;
a4783bd1 ZJS	187	}
ffbd2c4d NC	188	}
	189	}
	190
6656aefb	191	return r;
a4783bd1 ZJS	192	}
a4783bd1 ZJS	193
ae176752 CS	194	static int write_netlabel_rules(const char* srcdir) {
	195	_cleanup_fclose_ FILE *dst = NULL;
	196	_cleanup_closedir_ DIR *dir = NULL;
	197	struct dirent *entry;
ae176752 CS	198	int dfd = -1;
	199	int r = 0;
	200
	201	dst = fopen("/sys/fs/smackfs/netlabel", "we");
	202	if (!dst) {
	203	if (errno != ENOENT)
	204	log_warning_errno(errno, "Failed to open /sys/fs/smackfs/netlabel: %m");
	205	return -errno; /* negative error */
	206	}
	207
	208	/* write rules to dst from every file in the directory */
	209	dir = opendir(srcdir);
	210	if (!dir) {
	211	if (errno != ENOENT)
	212	log_warning_errno(errno, "Failed to opendir %s: %m", srcdir);
	213	return errno; /* positive on purpose */
	214	}
	215
	216	dfd = dirfd(dir);
	217	assert(dfd >= 0);
	218
	219	FOREACH_DIRENT(entry, dir, return 0) {
	220	int fd;
	221	_cleanup_fclose_ FILE *policy = NULL;
	222
	223	fd = openat(dfd, entry->d_name, O_RDONLY\|O_CLOEXEC);
	224	if (fd < 0) {
	225	if (r == 0)
	226	r = -errno;
	227	log_warning_errno(errno, "Failed to open %s: %m", entry->d_name);
	228	continue;
	229	}
	230
e92aaed3	231	policy = fdopen(fd, "r");
ae176752 CS	232	if (!policy) {
	233	if (r == 0)
	234	r = -errno;
	235	safe_close(fd);
	236	log_error_errno(errno, "Failed to open %s: %m", entry->d_name);
	237	continue;
	238	}
	239
0d536673 LP	240	(void) __fsetlocking(policy, FSETLOCKING_BYCALLER);
0d536673 LP	241
ae176752	242	/* load2 write rules in the kernel require a line buffered stream */
ea8b6526 LP	243	for (;;) {
ea8b6526 LP	244	_cleanup_free_ char *buf = NULL;
0d536673 LP	245	int q;
0d536673 LP	246
ea8b6526 LP	247	q = read_line(policy, NAME_MAX, &buf);
	248	if (q < 0)
	249	return log_error_errno(q, "Failed to read line from %s: %m", entry->d_name);
	250	if (q == 0)
	251	break;
	252
0d536673	253	if (!fputs(buf, dst)) {
ae176752 CS	254	if (r == 0)
ae176752 CS	255	r = -EINVAL;
5e1ee764	256	log_error_errno(errno, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	257	break;
ae176752 CS	258	}
0d536673 LP	259	q = fflush_and_check(dst);
0d536673 LP	260	if (q < 0) {
ae176752	261	if (r == 0)
0d536673 LP	262	r = q;
0d536673 LP	263	log_error_errno(q, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
ae176752 CS	264	break;
	265	}
	266	}
	267	}
	268
7f508f2c	269	return r;
ae176752 CS	270	}
ae176752 CS	271
217f95db WC	272	static int write_onlycap_list(void) {
	273	_cleanup_close_ int onlycap_fd = -1;
	274	_cleanup_free_ char *list = NULL;
	275	_cleanup_fclose_ FILE *f = NULL;
	276	size_t len = 0, allocated = 0;
217f95db WC	277	int r;
	278
	279	f = fopen("/etc/smack/onlycap", "re");
	280	if (!f) {
	281	if (errno != ENOENT)
9fd0b029 LP	282	log_warning_errno(errno, "Failed to read '/etc/smack/onlycap': %m");
9fd0b029 LP	283
217f95db WC	284	return errno == ENOENT ? ENOENT : -errno;
	285	}
	286
ea8b6526 LP	287	for (;;) {
ea8b6526 LP	288	_cleanup_free_ char *buf = NULL;
217f95db WC	289	size_t l;
217f95db WC	290
ea8b6526 LP	291	r = read_line(f, LONG_LINE_MAX, &buf);
	292	if (r < 0)
	293	return log_error_errno(r, "Failed to read line from /etc/smack/onlycap: %m");
	294	if (r == 0)
	295	break;
	296
	297	if (isempty(buf) \|\| strchr(COMMENTS, *buf))
217f95db WC	298	continue;
	299
	300	l = strlen(buf);
	301	if (!GREEDY_REALLOC(list, allocated, len + l + 1))
	302	return log_oom();
	303
	304	stpcpy(list + len, buf)[0] = ' ';
	305	len += l + 1;
	306	}
	307
9fd0b029	308	if (len == 0)
217f95db WC	309	return 0;
	310
	311	list[len - 1] = 0;
	312
	313	onlycap_fd = open("/sys/fs/smackfs/onlycap", O_WRONLY\|O_CLOEXEC\|O_NONBLOCK\|O_NOCTTY);
	314	if (onlycap_fd < 0) {
	315	if (errno != ENOENT)
9fd0b029	316	log_warning_errno(errno, "Failed to open '/sys/fs/smackfs/onlycap': %m");
217f95db WC	317	return -errno; /* negative error */
	318	}
	319
	320	r = write(onlycap_fd, list, len);
	321	if (r < 0)
9fd0b029	322	return log_error_errno(errno, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list);
217f95db WC	323
	324	return 0;
	325	}
	326
2b3e18de	327	#endif
ffbd2c4d	328
8a188de9	329	int mac_smack_setup(bool *loaded_policy) {
2b3e18de	330
f9fa32f0	331	#if ENABLE_SMACK
2b3e18de	332
a4783bd1 ZJS	333	int r;
a4783bd1 ZJS	334
e49d3c01 ŁS	335	assert(loaded_policy);
e49d3c01 ŁS	336
6656aefb	337	r = write_access2_rules("/etc/smack/accesses.d/");
a4783bd1 ZJS	338	switch(r) {
	339	case -ENOENT:
	340	log_debug("Smack is not enabled in the kernel.");
	341	return 0;
	342	case ENOENT:
6656aefb	343	log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
a4783bd1 ZJS	344	return 0;
	345	case 0:
	346	log_info("Successfully loaded Smack policies.");
abbacb1d NC	347	break;
abbacb1d NC	348	default:
e53fc357	349	log_warning_errno(r, "Failed to load Smack access rules, ignoring: %m");
abbacb1d NC	350	return 0;
	351	}
	352
8b197c3a	353	#ifdef SMACK_RUN_LABEL
57512c89	354	r = write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	355	if (r < 0)
ae176752 CS	356	log_warning_errno(r, "Failed to set SMACK label \"" SMACK_RUN_LABEL "\" on self: %m");
57512c89	357	r = write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	358	if (r < 0)
	359	log_warning_errno(r, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL "\": %m");
	360	r = write_string_file("/sys/fs/smackfs/netlabel",
57512c89	361	"0.0.0.0/0 " SMACK_RUN_LABEL, WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	362	if (r < 0)
ae176752 CS	363	log_warning_errno(r, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL "\": %m");
57512c89	364	r = write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER);
ae176752 CS	365	if (r < 0)
ae176752 CS	366	log_warning_errno(r, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
8b197c3a AK	367	#endif
8b197c3a AK	368
6656aefb	369	r = write_cipso2_rules("/etc/smack/cipso.d/");
abbacb1d NC	370	switch(r) {
	371	case -ENOENT:
	372	log_debug("Smack/CIPSO is not enabled in the kernel.");
	373	return 0;
	374	case ENOENT:
6656aefb	375	log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
ae176752	376	break;
abbacb1d NC	377	case 0:
abbacb1d NC	378	log_info("Successfully loaded Smack/CIPSO policies.");
b9289d4c	379	break;
a4783bd1	380	default:
e53fc357	381	log_warning_errno(r, "Failed to load Smack/CIPSO access rules, ignoring: %m");
ae176752 CS	382	break;
	383	}
	384
	385	r = write_netlabel_rules("/etc/smack/netlabel.d/");
	386	switch(r) {
	387	case -ENOENT:
	388	log_debug("Smack/CIPSO is not enabled in the kernel.");
a4783bd1	389	return 0;
ae176752 CS	390	case ENOENT:
	391	log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
	392	break;
	393	case 0:
	394	log_info("Successfully loaded Smack network host rules.");
	395	break;
	396	default:
	397	log_warning_errno(r, "Failed to load Smack network host rules: %m, ignoring.");
	398	break;
a4783bd1	399	}
2b3e18de	400
217f95db WC	401	r = write_onlycap_list();
	402	switch(r) {
	403	case -ENOENT:
	404	log_debug("Smack is not enabled in the kernel.");
	405	break;
	406	case ENOENT:
	407	log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
	408	break;
	409	case 0:
	410	log_info("Successfully wrote Smack onlycap list.");
	411	break;
	412	default:
5e1ee764	413	log_emergency_errno(r, "Failed to write Smack onlycap list: %m");
217f95db WC	414	return r;
	415	}
	416
e49d3c01 ŁS	417	*loaded_policy = true;
e49d3c01 ŁS	418
2b3e18de KL	419	#endif
	420
	421	return 0;
ffbd2c4d	422	}