| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2014 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <sys/types.h> |
| #include <pwd.h> |
| #include <grp.h> |
| #include <shadow.h> |
| #include <getopt.h> |
| #include <utmp.h> |
| |
| #include "util.h" |
| #include "hashmap.h" |
| #include "specifier.h" |
| #include "path-util.h" |
| #include "build.h" |
| #include "strv.h" |
| #include "conf-files.h" |
| #include "copy.h" |
| #include "utf8.h" |
| #include "label.h" |
| #include "fileio-label.h" |
| |
| typedef enum ItemType { |
| ADD_USER = 'u', |
| ADD_GROUP = 'g', |
| ADD_MEMBER = 'm', |
| } ItemType; |
| typedef struct Item { |
| ItemType type; |
| |
| char *name; |
| char *uid_path; |
| char *gid_path; |
| char *description; |
| |
| gid_t gid; |
| uid_t uid; |
| |
| bool gid_set:1; |
| bool uid_set:1; |
| |
| bool todo_user:1; |
| bool todo_group:1; |
| } Item; |
| |
| static char *arg_root = NULL; |
| |
| static const char conf_file_dirs[] = |
| "/etc/sysusers.d\0" |
| "/run/sysusers.d\0" |
| "/usr/local/lib/sysusers.d\0" |
| "/usr/lib/sysusers.d\0" |
| #ifdef HAVE_SPLIT_USR |
| "/lib/sysusers.d\0" |
| #endif |
| ; |
| |
| static Hashmap *users = NULL, *groups = NULL; |
| static Hashmap *todo_uids = NULL, *todo_gids = NULL; |
| static Hashmap *members = NULL; |
| |
| static Hashmap *database_uid = NULL, *database_user = NULL; |
| static Hashmap *database_gid = NULL, *database_group = NULL; |
| |
| static uid_t search_uid = SYSTEM_UID_MAX; |
| static gid_t search_gid = SYSTEM_GID_MAX; |
| |
| #define UID_TO_PTR(u) (ULONG_TO_PTR(u+1)) |
| #define PTR_TO_UID(u) ((uid_t) (PTR_TO_ULONG(u)-1)) |
| |
| #define GID_TO_PTR(g) (ULONG_TO_PTR(g+1)) |
| #define PTR_TO_GID(g) ((gid_t) (PTR_TO_ULONG(g)-1)) |
| |
| #define fix_root(x) (arg_root ? strappenda(arg_root, x) : x) |
| |
| static int load_user_database(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *passwd_path; |
| struct passwd *pw; |
| int r; |
| |
| passwd_path = fix_root("/etc/passwd"); |
| f = fopen(passwd_path, "re"); |
| if (!f) |
| return errno == ENOENT ? 0 : -errno; |
| |
| r = hashmap_ensure_allocated(&database_user, string_hash_func, string_compare_func); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_ensure_allocated(&database_uid, trivial_hash_func, trivial_compare_func); |
| if (r < 0) |
| return r; |
| |
| errno = 0; |
| while ((pw = fgetpwent(f))) { |
| char *n; |
| int k, q; |
| |
| n = strdup(pw->pw_name); |
| if (!n) |
| return -ENOMEM; |
| |
| k = hashmap_put(database_user, n, UID_TO_PTR(pw->pw_uid)); |
| if (k < 0 && k != -EEXIST) { |
| free(n); |
| return k; |
| } |
| |
| q = hashmap_put(database_uid, UID_TO_PTR(pw->pw_uid), n); |
| if (q < 0 && q != -EEXIST) { |
| if (k < 0) |
| free(n); |
| return q; |
| } |
| |
| if (q < 0 && k < 0) |
| free(n); |
| |
| errno = 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| |
| return 0; |
| } |
| |
| static int load_group_database(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *group_path; |
| struct group *gr; |
| int r; |
| |
| group_path = fix_root("/etc/group"); |
| f = fopen(group_path, "re"); |
| if (!f) |
| return errno == ENOENT ? 0 : -errno; |
| |
| r = hashmap_ensure_allocated(&database_group, string_hash_func, string_compare_func); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_ensure_allocated(&database_gid, trivial_hash_func, trivial_compare_func); |
| if (r < 0) |
| return r; |
| |
| errno = 0; |
| while ((gr = fgetgrent(f))) { |
| char *n; |
| int k, q; |
| |
| n = strdup(gr->gr_name); |
| if (!n) |
| return -ENOMEM; |
| |
| k = hashmap_put(database_group, n, GID_TO_PTR(gr->gr_gid)); |
| if (k < 0 && k != -EEXIST) { |
| free(n); |
| return k; |
| } |
| |
| q = hashmap_put(database_gid, GID_TO_PTR(gr->gr_gid), n); |
| if (q < 0 && q != -EEXIST) { |
| if (k < 0) |
| free(n); |
| return q; |
| } |
| |
| if (q < 0 && k < 0) |
| free(n); |
| |
| errno = 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| |
| return 0; |
| } |
| |
| static int make_backup(const char *target, const char *x) { |
| _cleanup_close_ int src = -1; |
| _cleanup_fclose_ FILE *dst = NULL; |
| char *backup, *temp; |
| struct timespec ts[2]; |
| struct stat st; |
| int r; |
| |
| src = open(x, O_RDONLY|O_CLOEXEC|O_NOCTTY); |
| if (src < 0) { |
| if (errno == ENOENT) /* No backup necessary... */ |
| return 0; |
| |
| return -errno; |
| } |
| |
| if (fstat(src, &st) < 0) |
| return -errno; |
| |
| r = fopen_temporary_label(target, x, &dst, &temp); |
| if (r < 0) |
| return r; |
| |
| r = copy_bytes(src, fileno(dst), (off_t) -1); |
| if (r < 0) |
| goto fail; |
| |
| /* Don't fail on chmod() or chown(). If it stays owned by us |
| * and/or unreadable by others, then it isn't too bad... */ |
| |
| backup = strappenda(x, "-"); |
| |
| /* Copy over the access mask */ |
| if (fchmod(fileno(dst), st.st_mode & 07777) < 0) |
| log_warning("Failed to change mode on %s: %m", backup); |
| |
| if (fchown(fileno(dst), st.st_uid, st.st_gid)< 0) |
| log_warning("Failed to change ownership of %s: %m", backup); |
| |
| ts[0] = st.st_atim; |
| ts[1] = st.st_mtim; |
| futimens(fileno(dst), ts); |
| |
| if (rename(temp, backup) < 0) |
| goto fail; |
| |
| return 0; |
| |
| fail: |
| unlink(temp); |
| return r; |
| } |
| |
| static int putgrent_with_members(const struct group *gr, FILE *group) { |
| char **a; |
| |
| assert(gr); |
| assert(group); |
| |
| a = hashmap_get(members, gr->gr_name); |
| if (a) { |
| _cleanup_strv_free_ char **l = NULL; |
| bool added = false; |
| char **i; |
| |
| l = strv_copy(gr->gr_mem); |
| if (!l) |
| return -ENOMEM; |
| |
| STRV_FOREACH(i, a) { |
| if (strv_find(l, *i)) |
| continue; |
| |
| if (strv_extend(&l, *i) < 0) |
| return -ENOMEM; |
| |
| added = true; |
| } |
| |
| if (added) { |
| struct group t; |
| |
| strv_uniq(l); |
| strv_sort(l); |
| |
| t = *gr; |
| t.gr_mem = l; |
| |
| errno = 0; |
| if (putgrent(&t, group) != 0) |
| return errno ? -errno : -EIO; |
| |
| return 1; |
| } |
| } |
| |
| errno = 0; |
| if (putgrent(gr, group) != 0) |
| return errno ? -errno : -EIO; |
| |
| return 0; |
| } |
| |
| static int write_files(void) { |
| |
| _cleanup_fclose_ FILE *passwd = NULL, *group = NULL; |
| _cleanup_free_ char *passwd_tmp = NULL, *group_tmp = NULL; |
| const char *passwd_path = NULL, *group_path = NULL; |
| bool group_changed = false; |
| Iterator iterator; |
| Item *i; |
| int r; |
| |
| /* We don't patch /etc/shadow or /etc/gshadow here, since we |
| * only create user accounts without passwords anyway. */ |
| |
| if (hashmap_size(todo_gids) > 0 || hashmap_size(members) > 0) { |
| _cleanup_fclose_ FILE *original = NULL; |
| |
| group_path = fix_root("/etc/group"); |
| r = fopen_temporary_label("/etc/group", group_path, &group, &group_tmp); |
| if (r < 0) |
| goto finish; |
| |
| if (fchmod(fileno(group), 0644) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| original = fopen(group_path, "re"); |
| if (original) { |
| struct group *gr; |
| |
| errno = 0; |
| while ((gr = fgetgrent(original))) { |
| /* Safety checks against name and GID |
| * collisions. Normally, this should |
| * be unnecessary, but given that we |
| * look at the entries anyway here, |
| * let's make an extra verification |
| * step that we don't generate |
| * duplicate entries. */ |
| |
| i = hashmap_get(groups, gr->gr_name); |
| if (i && i->todo_group) { |
| r = -EEXIST; |
| goto finish; |
| } |
| |
| if (hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid))) { |
| r = -EEXIST; |
| goto finish; |
| } |
| |
| r = putgrent_with_members(gr, group); |
| if (r < 0) |
| goto finish; |
| |
| if (r > 0) |
| group_changed = true; |
| |
| errno = 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) { |
| r = -errno; |
| goto finish; |
| } |
| |
| } else if (errno != ENOENT) { |
| r = -errno; |
| goto finish; |
| } |
| |
| HASHMAP_FOREACH(i, todo_gids, iterator) { |
| struct group n = { |
| .gr_name = i->name, |
| .gr_gid = i->gid, |
| .gr_passwd = (char*) "x", |
| }; |
| |
| r = putgrent_with_members(&n, group); |
| if (r < 0) |
| goto finish; |
| |
| group_changed = true; |
| } |
| |
| r = fflush_and_check(group); |
| if (r < 0) |
| goto finish; |
| } |
| |
| if (hashmap_size(todo_uids) > 0) { |
| _cleanup_fclose_ FILE *original = NULL; |
| |
| passwd_path = fix_root("/etc/passwd"); |
| r = fopen_temporary_label("/etc/passwd", passwd_path, &passwd, &passwd_tmp); |
| if (r < 0) |
| goto finish; |
| |
| if (fchmod(fileno(passwd), 0644) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| original = fopen(passwd_path, "re"); |
| if (original) { |
| struct passwd *pw; |
| |
| errno = 0; |
| while ((pw = fgetpwent(original))) { |
| |
| i = hashmap_get(users, pw->pw_name); |
| if (i && i->todo_user) { |
| r = -EEXIST; |
| goto finish; |
| } |
| |
| if (hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid))) { |
| r = -EEXIST; |
| goto finish; |
| } |
| |
| errno = 0; |
| if (putpwent(pw, passwd) < 0) { |
| r = errno ? -errno : -EIO; |
| goto finish; |
| } |
| |
| errno = 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) { |
| r = -errno; |
| goto finish; |
| } |
| |
| } else if (errno != ENOENT) { |
| r = -errno; |
| goto finish; |
| } |
| |
| HASHMAP_FOREACH(i, todo_uids, iterator) { |
| struct passwd n = { |
| .pw_name = i->name, |
| .pw_uid = i->uid, |
| .pw_gid = i->gid, |
| .pw_gecos = i->description, |
| .pw_passwd = (char*) "x", |
| }; |
| |
| /* Initialize the home directory and the shell |
| * to nologin, with one exception: for root we |
| * patch in something special */ |
| if (i->uid == 0) { |
| n.pw_shell = (char*) "/bin/sh"; |
| n.pw_dir = (char*) "/root"; |
| } else { |
| n.pw_shell = (char*) "/sbin/nologin"; |
| n.pw_dir = (char*) "/"; |
| } |
| |
| errno = 0; |
| if (putpwent(&n, passwd) != 0) { |
| r = errno ? -errno : -EIO; |
| goto finish; |
| } |
| } |
| |
| r = fflush_and_check(passwd); |
| if (r < 0) |
| goto finish; |
| } |
| |
| /* Make a backup of the old files */ |
| if (group && group_changed) { |
| r = make_backup("/etc/group", group_path); |
| if (r < 0) |
| goto finish; |
| } |
| |
| if (passwd) { |
| r = make_backup("/etc/passwd", passwd_path); |
| if (r < 0) |
| goto finish; |
| } |
| |
| /* And make the new files count */ |
| if (group && group_changed) { |
| if (rename(group_tmp, group_path) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| free(group_tmp); |
| group_tmp = NULL; |
| } |
| |
| if (passwd) { |
| if (rename(passwd_tmp, passwd_path) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| free(passwd_tmp); |
| passwd_tmp = NULL; |
| } |
| |
| r = 0; |
| |
| finish: |
| if (passwd_tmp) |
| unlink(passwd_tmp); |
| if (group_tmp) |
| unlink(group_tmp); |
| |
| return r; |
| } |
| |
| static int uid_is_ok(uid_t uid, const char *name) { |
| struct passwd *p; |
| struct group *g; |
| const char *n; |
| Item *i; |
| |
| /* Let's see if we already have assigned the UID a second time */ |
| if (hashmap_get(todo_uids, UID_TO_PTR(uid))) |
| return 0; |
| |
| /* Try to avoid using uids that are already used by a group |
| * that doesn't have the same name as our new user. */ |
| i = hashmap_get(todo_gids, GID_TO_PTR(uid)); |
| if (i && !streq(i->name, name)) |
| return 0; |
| |
| /* Let's check the files directly */ |
| if (hashmap_contains(database_uid, UID_TO_PTR(uid))) |
| return 0; |
| |
| n = hashmap_get(database_gid, GID_TO_PTR(uid)); |
| if (n && !streq(n, name)) |
| return 0; |
| |
| /* Let's also check via NSS, to avoid UID clashes over LDAP and such, just in case */ |
| if (!arg_root) { |
| errno = 0; |
| p = getpwuid(uid); |
| if (p) |
| return 0; |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| |
| errno = 0; |
| g = getgrgid((gid_t) uid); |
| if (g) { |
| if (!streq(g->gr_name, name)) |
| return 0; |
| } else if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| } |
| |
| return 1; |
| } |
| |
| static int root_stat(const char *p, struct stat *st) { |
| const char *fix; |
| |
| fix = fix_root(p); |
| if (stat(fix, st) < 0) |
| return -errno; |
| |
| return 0; |
| } |
| |
| static int read_id_from_file(Item *i, uid_t *_uid, gid_t *_gid) { |
| struct stat st; |
| bool found_uid = false, found_gid = false; |
| uid_t uid; |
| gid_t gid; |
| |
| assert(i); |
| |
| /* First, try to get the gid directly */ |
| if (_gid && i->gid_path && root_stat(i->gid_path, &st) >= 0) { |
| gid = st.st_gid; |
| found_gid = true; |
| } |
| |
| /* Then, try to get the uid directly */ |
| if ((_uid || (_gid && !found_gid)) |
| && i->uid_path |
| && root_stat(i->uid_path, &st) >= 0) { |
| |
| uid = st.st_uid; |
| found_uid = true; |
| |
| /* If we need the gid, but had no success yet, also derive it from the uid path */ |
| if (_gid && !found_gid) { |
| gid = st.st_gid; |
| found_gid = true; |
| } |
| } |
| |
| /* If that didn't work yet, then let's reuse the gid as uid */ |
| if (_uid && !found_uid && i->gid_path) { |
| |
| if (found_gid) { |
| uid = (uid_t) gid; |
| found_uid = true; |
| } else if (root_stat(i->gid_path, &st) >= 0) { |
| uid = (uid_t) st.st_gid; |
| found_uid = true; |
| } |
| } |
| |
| if (_uid) { |
| if (!found_uid) |
| return 0; |
| |
| *_uid = uid; |
| } |
| |
| if (_gid) { |
| if (!found_gid) |
| return 0; |
| |
| *_gid = gid; |
| } |
| |
| return 1; |
| } |
| |
| static int add_user(Item *i) { |
| void *z; |
| int r; |
| |
| assert(i); |
| |
| /* Check the database directly */ |
| z = hashmap_get(database_user, i->name); |
| if (z) { |
| log_debug("User %s already exists.", i->name); |
| i->uid = PTR_TO_UID(z); |
| i->uid_set = true; |
| return 0; |
| } |
| |
| if (!arg_root) { |
| struct passwd *p; |
| struct spwd *sp; |
| |
| /* Also check NSS */ |
| errno = 0; |
| p = getpwnam(i->name); |
| if (p) { |
| log_debug("User %s already exists.", i->name); |
| i->uid = p->pw_uid; |
| i->uid_set = true; |
| |
| free(i->description); |
| i->description = strdup(p->pw_gecos); |
| return 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) { |
| log_error("Failed to check if user %s already exists: %m", i->name); |
| return -errno; |
| } |
| |
| /* And shadow too, just to be sure */ |
| errno = 0; |
| sp = getspnam(i->name); |
| if (sp) { |
| log_error("User %s already exists in shadow database, but not in user database.", i->name); |
| return -EBADMSG; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) { |
| log_error("Failed to check if user %s already exists in shadow database: %m", i->name); |
| return -errno; |
| } |
| } |
| |
| /* Try to use the suggested numeric uid */ |
| if (i->uid_set) { |
| r = uid_is_ok(i->uid, i->name); |
| if (r < 0) { |
| log_error("Failed to verify uid " UID_FMT ": %s", i->uid, strerror(-r)); |
| return r; |
| } |
| if (r == 0) { |
| log_debug("Suggested user ID " UID_FMT " for %s already used.", i->uid, i->name); |
| i->uid_set = false; |
| } |
| } |
| |
| /* If that didn't work, try to read it from the specified path */ |
| if (!i->uid_set) { |
| uid_t c; |
| |
| if (read_id_from_file(i, &c, NULL) > 0) { |
| |
| if (c <= 0 || c > SYSTEM_UID_MAX) |
| log_debug("User ID " UID_FMT " of file not suitable for %s.", c, i->name); |
| else { |
| r = uid_is_ok(c, i->name); |
| if (r < 0) { |
| log_error("Failed to verify uid " UID_FMT ": %s", i->uid, strerror(-r)); |
| return r; |
| } else if (r > 0) { |
| i->uid = c; |
| i->uid_set = true; |
| } else |
| log_debug("User ID " UID_FMT " of file for %s is already used.", c, i->name); |
| } |
| } |
| } |
| |
| /* Otherwise try to reuse the group ID */ |
| if (!i->uid_set && i->gid_set) { |
| r = uid_is_ok((uid_t) i->gid, i->name); |
| if (r < 0) { |
| log_error("Failed to verify uid " UID_FMT ": %s", i->uid, strerror(-r)); |
| return r; |
| } |
| if (r > 0) { |
| i->uid = (uid_t) i->gid; |
| i->uid_set = true; |
| } |
| } |
| |
| /* And if that didn't work either, let's try to find a free one */ |
| if (!i->uid_set) { |
| for (; search_uid > 0; search_uid--) { |
| |
| r = uid_is_ok(search_uid, i->name); |
| if (r < 0) { |
| log_error("Failed to verify uid " UID_FMT ": %s", i->uid, strerror(-r)); |
| return r; |
| } else if (r > 0) |
| break; |
| } |
| |
| if (search_uid <= 0) { |
| log_error("No free user ID available for %s.", i->name); |
| return -E2BIG; |
| } |
| |
| i->uid_set = true; |
| i->uid = search_uid; |
| |
| search_uid--; |
| } |
| |
| r = hashmap_ensure_allocated(&todo_uids, trivial_hash_func, trivial_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| r = hashmap_put(todo_uids, UID_TO_PTR(i->uid), i); |
| if (r < 0) |
| return log_oom(); |
| |
| i->todo_user = true; |
| log_info("Creating user %s (%s) with uid " UID_FMT " and gid " GID_FMT ".", i->name, strna(i->description), i->uid, i->gid); |
| |
| return 0; |
| } |
| |
| static int gid_is_ok(gid_t gid) { |
| struct group *g; |
| struct passwd *p; |
| |
| if (hashmap_get(todo_gids, GID_TO_PTR(gid))) |
| return 0; |
| |
| /* Avoid reusing gids that are already used by a different user */ |
| if (hashmap_get(todo_uids, UID_TO_PTR(gid))) |
| return 0; |
| |
| if (hashmap_contains(database_gid, GID_TO_PTR(gid))) |
| return 0; |
| |
| if (hashmap_contains(database_uid, UID_TO_PTR(gid))) |
| return 0; |
| |
| if (!arg_root) { |
| errno = 0; |
| g = getgrgid(gid); |
| if (g) |
| return 0; |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| |
| errno = 0; |
| p = getpwuid((uid_t) gid); |
| if (p) |
| return 0; |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| } |
| |
| return 1; |
| } |
| |
| static int add_group(Item *i) { |
| void *z; |
| int r; |
| |
| assert(i); |
| |
| /* Check the database directly */ |
| z = hashmap_get(database_group, i->name); |
| if (z) { |
| log_debug("Group %s already exists.", i->name); |
| i->gid = PTR_TO_GID(z); |
| i->gid_set = true; |
| return 0; |
| } |
| |
| /* Also check NSS */ |
| if (!arg_root) { |
| struct group *g; |
| |
| errno = 0; |
| g = getgrnam(i->name); |
| if (g) { |
| log_debug("Group %s already exists.", i->name); |
| i->gid = g->gr_gid; |
| i->gid_set = true; |
| return 0; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) { |
| log_error("Failed to check if group %s already exists: %m", i->name); |
| return -errno; |
| } |
| } |
| |
| /* Try to use the suggested numeric gid */ |
| if (i->gid_set) { |
| r = gid_is_ok(i->gid); |
| if (r < 0) { |
| log_error("Failed to verify gid " GID_FMT ": %s", i->gid, strerror(-r)); |
| return r; |
| } |
| if (r == 0) { |
| log_debug("Suggested group ID " GID_FMT " for %s already used.", i->gid, i->name); |
| i->gid_set = false; |
| } |
| } |
| |
| /* Try to reuse the numeric uid, if there's one */ |
| if (!i->gid_set && i->uid_set) { |
| r = gid_is_ok((gid_t) i->uid); |
| if (r < 0) { |
| log_error("Failed to verify gid " GID_FMT ": %s", i->gid, strerror(-r)); |
| return r; |
| } |
| if (r > 0) { |
| i->gid = (gid_t) i->uid; |
| i->gid_set = true; |
| } |
| } |
| |
| /* If that didn't work, try to read it from the specified path */ |
| if (!i->gid_set) { |
| gid_t c; |
| |
| if (read_id_from_file(i, NULL, &c) > 0) { |
| |
| if (c <= 0 || c > SYSTEM_GID_MAX) |
| log_debug("Group ID " GID_FMT " of file not suitable for %s.", c, i->name); |
| else { |
| r = gid_is_ok(c); |
| if (r < 0) { |
| log_error("Failed to verify gid " GID_FMT ": %s", i->gid, strerror(-r)); |
| return r; |
| } else if (r > 0) { |
| i->gid = c; |
| i->gid_set = true; |
| } else |
| log_debug("Group ID " GID_FMT " of file for %s already used.", c, i->name); |
| } |
| } |
| } |
| |
| /* And if that didn't work either, let's try to find a free one */ |
| if (!i->gid_set) { |
| for (; search_gid > 0; search_gid--) { |
| r = gid_is_ok(search_gid); |
| if (r < 0) { |
| log_error("Failed to verify gid " GID_FMT ": %s", i->gid, strerror(-r)); |
| return r; |
| } else if (r > 0) |
| break; |
| } |
| |
| if (search_gid <= 0) { |
| log_error("No free group ID available for %s.", i->name); |
| return -E2BIG; |
| } |
| |
| i->gid_set = true; |
| i->gid = search_gid; |
| |
| search_gid--; |
| } |
| |
| r = hashmap_ensure_allocated(&todo_gids, trivial_hash_func, trivial_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| r = hashmap_put(todo_gids, GID_TO_PTR(i->gid), i); |
| if (r < 0) |
| return log_oom(); |
| |
| i->todo_group = true; |
| log_info("Creating group %s with gid " GID_FMT ".", i->name, i->gid); |
| |
| return 0; |
| } |
| |
| static int process_item(Item *i) { |
| int r; |
| |
| assert(i); |
| |
| switch (i->type) { |
| |
| case ADD_USER: |
| r = add_group(i); |
| if (r < 0) |
| return r; |
| |
| return add_user(i); |
| |
| case ADD_GROUP: { |
| Item *j; |
| |
| j = hashmap_get(users, i->name); |
| if (j) { |
| /* There's already user to be created for this |
| * name, let's process that in one step */ |
| |
| if (i->gid_set) { |
| j->gid = i->gid; |
| j->gid_set = true; |
| } |
| |
| if (i->gid_path) { |
| free(j->gid_path); |
| j->gid_path = strdup(i->gid_path); |
| if (!j->gid_path) |
| return log_oom(); |
| } |
| |
| return 0; |
| } |
| |
| return add_group(i); |
| } |
| |
| default: |
| assert_not_reached("Unknown item type"); |
| } |
| } |
| |
| static void item_free(Item *i) { |
| |
| if (!i) |
| return; |
| |
| free(i->name); |
| free(i->uid_path); |
| free(i->gid_path); |
| free(i->description); |
| free(i); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free); |
| |
| static int add_implicit(void) { |
| char *g, **l; |
| Iterator iterator; |
| int r; |
| |
| /* Implicitly create additional users and groups, if they were listed in "m" lines */ |
| |
| HASHMAP_FOREACH_KEY(l, g, members, iterator) { |
| Item *i; |
| char **m; |
| |
| i = hashmap_get(groups, g); |
| if (!i) { |
| _cleanup_(item_freep) Item *j = NULL; |
| |
| r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| j = new0(Item, 1); |
| if (!j) |
| return log_oom(); |
| |
| j->type = ADD_GROUP; |
| j->name = strdup(g); |
| if (!j->name) |
| return log_oom(); |
| |
| r = hashmap_put(groups, j->name, j); |
| if (r < 0) |
| return log_oom(); |
| |
| log_debug("Adding implicit group '%s' due to m line", j->name); |
| j = NULL; |
| } |
| |
| STRV_FOREACH(m, l) { |
| |
| i = hashmap_get(users, *m); |
| if (!i) { |
| _cleanup_(item_freep) Item *j = NULL; |
| |
| r = hashmap_ensure_allocated(&users, string_hash_func, string_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| j = new0(Item, 1); |
| if (!j) |
| return log_oom(); |
| |
| j->type = ADD_USER; |
| j->name = strdup(*m); |
| if (!j->name) |
| return log_oom(); |
| |
| r = hashmap_put(users, j->name, j); |
| if (r < 0) |
| return log_oom(); |
| |
| log_debug("Adding implicit user '%s' due to m line", j->name); |
| j = NULL; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| static bool item_equal(Item *a, Item *b) { |
| assert(a); |
| assert(b); |
| |
| if (a->type != b->type) |
| return false; |
| |
| if (!streq_ptr(a->name, b->name)) |
| return false; |
| |
| if (!streq_ptr(a->uid_path, b->uid_path)) |
| return false; |
| |
| if (!streq_ptr(a->gid_path, b->gid_path)) |
| return false; |
| |
| if (!streq_ptr(a->description, b->description)) |
| return false; |
| |
| if (a->uid_set != b->uid_set) |
| return false; |
| |
| if (a->uid_set && a->uid != b->uid) |
| return false; |
| |
| if (a->gid_set != b->gid_set) |
| return false; |
| |
| if (a->gid_set && a->gid != b->gid) |
| return false; |
| |
| return true; |
| } |
| |
| static bool valid_user_group_name(const char *u) { |
| const char *i; |
| long sz; |
| |
| if (isempty(u) < 0) |
| return false; |
| |
| if (!(u[0] >= 'a' && u[0] <= 'z') && |
| !(u[0] >= 'A' && u[0] <= 'Z') && |
| u[0] != '_') |
| return false; |
| |
| for (i = u+1; *i; i++) { |
| if (!(*i >= 'a' && *i <= 'z') && |
| !(*i >= 'A' && *i <= 'Z') && |
| !(*i >= '0' && *i <= '9') && |
| *i != '_' && |
| *i != '-') |
| return false; |
| } |
| |
| sz = sysconf(_SC_LOGIN_NAME_MAX); |
| assert_se(sz > 0); |
| |
| if ((size_t) (i-u) > (size_t) sz) |
| return false; |
| |
| if ((size_t) (i-u) > UT_NAMESIZE - 1) |
| return false; |
| |
| return true; |
| } |
| |
| static bool valid_gecos(const char *d) { |
| |
| if (!utf8_is_valid(d)) |
| return false; |
| |
| if (string_has_cc(d, NULL)) |
| return false; |
| |
| /* Colons are used as field separators, and hence not OK */ |
| if (strchr(d, ':')) |
| return false; |
| |
| return true; |
| } |
| |
| static int parse_line(const char *fname, unsigned line, const char *buffer) { |
| |
| static const Specifier specifier_table[] = { |
| { 'm', specifier_machine_id, NULL }, |
| { 'b', specifier_boot_id, NULL }, |
| { 'H', specifier_host_name, NULL }, |
| { 'v', specifier_kernel_release, NULL }, |
| {} |
| }; |
| |
| _cleanup_free_ char *action = NULL, *name = NULL, *id = NULL, *resolved_name = NULL; |
| _cleanup_(item_freep) Item *i = NULL; |
| Item *existing; |
| Hashmap *h; |
| int r, n = -1; |
| |
| assert(fname); |
| assert(line >= 1); |
| assert(buffer); |
| |
| r = sscanf(buffer, |
| "%ms %ms %ms %n", |
| &action, |
| &name, |
| &id, |
| &n); |
| if (r < 2) { |
| log_error("[%s:%u] Syntax error.", fname, line); |
| return -EIO; |
| } |
| |
| if (strlen(action) != 1) { |
| log_error("[%s:%u] Unknown modifier '%s'", fname, line, action); |
| return -EINVAL; |
| } |
| |
| if (!IN_SET(action[0], ADD_USER, ADD_GROUP, ADD_MEMBER)) { |
| log_error("[%s:%u] Unknown command command type '%c'.", fname, line, action[0]); |
| return -EBADMSG; |
| } |
| |
| r = specifier_printf(name, specifier_table, NULL, &resolved_name); |
| if (r < 0) { |
| log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, name); |
| return r; |
| } |
| |
| if (!valid_user_group_name(resolved_name)) { |
| log_error("[%s:%u] '%s' is not a valid user or group name.", fname, line, resolved_name); |
| return -EINVAL; |
| } |
| |
| if (n >= 0) { |
| n += strspn(buffer+n, WHITESPACE); |
| |
| if (STR_IN_SET(buffer + n, "", "-")) |
| n = -1; |
| } |
| |
| switch (action[0]) { |
| |
| case ADD_MEMBER: { |
| _cleanup_free_ char *resolved_id = NULL; |
| char **l; |
| |
| r = hashmap_ensure_allocated(&members, string_hash_func, string_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| /* Try to extend an existing member or group item */ |
| |
| if (!id || streq(id, "-")) { |
| log_error("[%s:%u] Lines of type 'm' require a group name in the third field.", fname, line); |
| return -EINVAL; |
| } |
| |
| r = specifier_printf(id, specifier_table, NULL, &resolved_id); |
| if (r < 0) { |
| log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, name); |
| return r; |
| } |
| |
| if (!valid_user_group_name(resolved_id)) { |
| log_error("[%s:%u] '%s' is not a valid user or group name.", fname, line, resolved_id); |
| return -EINVAL; |
| } |
| |
| if (n >= 0) { |
| log_error("[%s:%u] Lines of type 'm' don't take a GECOS field.", fname, line); |
| return -EINVAL; |
| } |
| |
| l = hashmap_get(members, resolved_id); |
| if (l) { |
| /* A list for this group name already exists, let's append to it */ |
| r = strv_push(&l, resolved_name); |
| if (r < 0) |
| return log_oom(); |
| |
| resolved_name = NULL; |
| |
| assert_se(hashmap_update(members, resolved_id, l) >= 0); |
| } else { |
| /* No list for this group name exists yet, create one */ |
| |
| l = new0(char *, 2); |
| if (!l) |
| return -ENOMEM; |
| |
| l[0] = resolved_name; |
| l[1] = NULL; |
| |
| r = hashmap_put(members, resolved_id, l); |
| if (r < 0) { |
| free(l); |
| return log_oom(); |
| } |
| |
| resolved_id = resolved_name = NULL; |
| } |
| |
| return 0; |
| } |
| |
| case ADD_USER: |
| r = hashmap_ensure_allocated(&users, string_hash_func, string_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| i = new0(Item, 1); |
| if (!i) |
| return log_oom(); |
| |
| if (id && !streq(id, "-")) { |
| |
| if (path_is_absolute(id)) { |
| i->uid_path = strdup(id); |
| if (!i->uid_path) |
| return log_oom(); |
| |
| path_kill_slashes(i->uid_path); |
| |
| } else { |
| r = parse_uid(id, &i->uid); |
| if (r < 0) { |
| log_error("Failed to parse UID: %s", id); |
| return -EBADMSG; |
| } |
| |
| i->uid_set = true; |
| } |
| } |
| |
| if (n >= 0) { |
| i->description = unquote(buffer+n, "\""); |
| if (!i->description) |
| return log_oom(); |
| |
| if (!valid_gecos(i->description)) { |
| log_error("[%s:%u] '%s' is not a valid GECOS field.", fname, line, i->description); |
| return -EINVAL; |
| } |
| } |
| |
| h = users; |
| break; |
| |
| case ADD_GROUP: |
| r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func); |
| if (r < 0) |
| return log_oom(); |
| |
| if (n >= 0) { |
| log_error("[%s:%u] Lines of type 'g' don't take a GECOS field.", fname, line); |
| return -EINVAL; |
| } |
| |
| i = new0(Item, 1); |
| if (!i) |
| return log_oom(); |
| |
| if (id && !streq(id, "-")) { |
| |
| if (path_is_absolute(id)) { |
| i->gid_path = strdup(id); |
| if (!i->gid_path) |
| return log_oom(); |
| |
| path_kill_slashes(i->gid_path); |
| } else { |
| r = parse_gid(id, &i->gid); |
| if (r < 0) { |
| log_error("Failed to parse GID: %s", id); |
| return -EBADMSG; |
| } |
| |
| i->gid_set = true; |
| } |
| } |
| |
| |
| h = groups; |
| break; |
| default: |
| return -EBADMSG; |
| } |
| |
| i->type = action[0]; |
| i->name = resolved_name; |
| resolved_name = NULL; |
| |
| existing = hashmap_get(h, i->name); |
| if (existing) { |
| |
| /* Two identical items are fine */ |
| if (!item_equal(existing, i)) |
| log_warning("Two or more conflicting lines for %s configured, ignoring.", i->name); |
| |
| return 0; |
| } |
| |
| r = hashmap_put(h, i->name, i); |
| if (r < 0) |
| return log_oom(); |
| |
| i = NULL; |
| return 0; |
| } |
| |
| static int read_config_file(const char *fn, bool ignore_enoent) { |
| _cleanup_fclose_ FILE *f = NULL; |
| char line[LINE_MAX]; |
| unsigned v = 0; |
| int r; |
| |
| assert(fn); |
| |
| r = search_and_fopen_nulstr(fn, "re", arg_root, conf_file_dirs, &f); |
| if (r < 0) { |
| if (ignore_enoent && r == -ENOENT) |
| return 0; |
| |
| log_error("Failed to open '%s', ignoring: %s", fn, strerror(-r)); |
| return r; |
| } |
| |
| FOREACH_LINE(line, f, break) { |
| char *l; |
| int k; |
| |
| v++; |
| |
| l = strstrip(line); |
| if (*l == '#' || *l == 0) |
| continue; |
| |
| k = parse_line(fn, v, l); |
| if (k < 0 && r == 0) |
| r = k; |
| } |
| |
| if (ferror(f)) { |
| log_error("Failed to read from file %s: %m", fn); |
| if (r == 0) |
| r = -EIO; |
| } |
| |
| return r; |
| } |
| |
| static int take_lock(void) { |
| |
| struct flock flock = { |
| .l_type = F_WRLCK, |
| .l_whence = SEEK_SET, |
| .l_start = 0, |
| .l_len = 0, |
| }; |
| |
| const char *path; |
| int fd, r; |
| |
| /* This is roughly the same as lckpwdf(), but not as awful. We |
| * don't want to use alarm() and signals, hence we implement |
| * our own trivial version of this. |
| * |
| * Note that shadow-utils also takes per-database locks in |
| * addition to lckpwdf(). However, we don't given that they |
| * are redundant as they they invoke lckpwdf() first and keep |
| * it during everything they do. The per-database locks are |
| * awfully racy, and thus we just won't do them. */ |
| |
| path = fix_root("/etc/.pwd.lock"); |
| fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600); |
| if (fd < 0) |
| return -errno; |
| |
| r = fcntl(fd, F_SETLKW, &flock); |
| if (r < 0) { |
| safe_close(fd); |
| return -errno; |
| } |
| |
| return fd; |
| } |
| |
| static void free_database(Hashmap *by_name, Hashmap *by_id) { |
| char *name; |
| |
| for (;;) { |
| name = hashmap_first(by_id); |
| if (!name) |
| break; |
| |
| hashmap_remove(by_name, name); |
| |
| hashmap_steal_first_key(by_id); |
| free(name); |
| } |
| |
| while ((name = hashmap_steal_first_key(by_name))) |
| free(name); |
| |
| hashmap_free(by_name); |
| hashmap_free(by_id); |
| } |
| |
| static int help(void) { |
| |
| printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
| "Creates system user accounts.\n\n" |
| " -h --help Show this help\n" |
| " --version Show package version\n" |
| " --root=PATH Operate on an alternate filesystem root\n", |
| program_invocation_short_name); |
| |
| return 0; |
| } |
| |
| static int parse_argv(int argc, char *argv[]) { |
| |
| enum { |
| ARG_VERSION = 0x100, |
| ARG_ROOT, |
| }; |
| |
| static const struct option options[] = { |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, ARG_VERSION }, |
| { "root", required_argument, NULL, ARG_ROOT }, |
| {} |
| }; |
| |
| int c; |
| |
| assert(argc >= 0); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) { |
| |
| switch (c) { |
| |
| case 'h': |
| return help(); |
| |
| case ARG_VERSION: |
| puts(PACKAGE_STRING); |
| puts(SYSTEMD_FEATURES); |
| return 0; |
| |
| case ARG_ROOT: |
| free(arg_root); |
| arg_root = path_make_absolute_cwd(optarg); |
| if (!arg_root) |
| return log_oom(); |
| |
| path_kill_slashes(arg_root); |
| break; |
| |
| case '?': |
| return -EINVAL; |
| |
| default: |
| assert_not_reached("Unhandled option"); |
| } |
| } |
| |
| return 1; |
| } |
| |
| int main(int argc, char *argv[]) { |
| |
| _cleanup_close_ int lock = -1; |
| Iterator iterator; |
| int r, k; |
| Item *i; |
| char *n; |
| |
| r = parse_argv(argc, argv); |
| if (r <= 0) |
| goto finish; |
| |
| log_set_target(LOG_TARGET_AUTO); |
| log_parse_environment(); |
| log_open(); |
| |
| umask(0022); |
| |
| r = label_init(NULL); |
| if (r < 0) { |
| log_error("SELinux setup failed: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| if (optind < argc) { |
| int j; |
| |
| for (j = optind; j < argc; j++) { |
| k = read_config_file(argv[j], false); |
| if (k < 0 && r == 0) |
| r = k; |
| } |
| } else { |
| _cleanup_strv_free_ char **files = NULL; |
| char **f; |
| |
| r = conf_files_list_nulstr(&files, ".conf", arg_root, conf_file_dirs); |
| if (r < 0) { |
| log_error("Failed to enumerate sysusers.d files: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| STRV_FOREACH(f, files) { |
| k = read_config_file(*f, true); |
| if (k < 0 && r == 0) |
| r = k; |
| } |
| } |
| |
| r = add_implicit(); |
| if (r < 0) |
| goto finish; |
| |
| lock = take_lock(); |
| if (lock < 0) { |
| log_error("Failed to take lock: %s", strerror(-lock)); |
| goto finish; |
| } |
| |
| r = load_user_database(); |
| if (r < 0) { |
| log_error("Failed to load user database: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| r = load_group_database(); |
| if (r < 0) { |
| log_error("Failed to read group database: %s", strerror(-r)); |
| goto finish; |
| } |
| |
| HASHMAP_FOREACH(i, groups, iterator) |
| process_item(i); |
| |
| HASHMAP_FOREACH(i, users, iterator) |
| process_item(i); |
| |
| r = write_files(); |
| if (r < 0) |
| log_error("Failed to write files: %s", strerror(-r)); |
| |
| finish: |
| while ((i = hashmap_steal_first(groups))) |
| item_free(i); |
| |
| while ((i = hashmap_steal_first(users))) |
| item_free(i); |
| |
| while ((n = hashmap_first_key(members))) { |
| strv_free(hashmap_steal_first(members)); |
| free(n); |
| } |
| |
| hashmap_free(groups); |
| hashmap_free(users); |
| hashmap_free(members); |
| hashmap_free(todo_uids); |
| hashmap_free(todo_gids); |
| |
| free_database(database_user, database_uid); |
| free_database(database_group, database_gid); |
| |
| free(arg_root); |
| |
| return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
| } |