| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <getopt.h> |
| #include <utmp.h> |
| |
| #include "alloc-util.h" |
| #include "conf-files.h" |
| #include "copy.h" |
| #include "def.h" |
| #include "dissect-image.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "format-util.h" |
| #include "fs-util.h" |
| #include "hashmap.h" |
| #include "main-func.h" |
| #include "mount-util.h" |
| #include "pager.h" |
| #include "path-util.h" |
| #include "pretty-print.h" |
| #include "selinux-util.h" |
| #include "set.h" |
| #include "smack-util.h" |
| #include "specifier.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "tmpfile-util-label.h" |
| #include "uid-range.h" |
| #include "user-record.h" |
| #include "user-util.h" |
| #include "utf8.h" |
| #include "util.h" |
| |
| typedef enum ItemType { |
| ADD_USER = 'u', |
| ADD_GROUP = 'g', |
| ADD_MEMBER = 'm', |
| ADD_RANGE = 'r', |
| } ItemType; |
| |
| typedef struct Item { |
| ItemType type; |
| |
| char *name; |
| char *group_name; |
| char *uid_path; |
| char *gid_path; |
| char *description; |
| char *home; |
| char *shell; |
| |
| gid_t gid; |
| uid_t uid; |
| |
| bool gid_set:1; |
| |
| /* When set the group with the specified gid must exist |
| * and the check if a uid clashes with the gid is skipped. |
| */ |
| bool id_set_strict:1; |
| |
| bool uid_set:1; |
| |
| bool todo_user:1; |
| bool todo_group:1; |
| } Item; |
| |
| static char *arg_root = NULL; |
| static char *arg_image = NULL; |
| static bool arg_cat_config = false; |
| static const char *arg_replace = NULL; |
| static bool arg_inline = false; |
| static PagerFlags arg_pager_flags = 0; |
| |
| static OrderedHashmap *users = NULL, *groups = NULL; |
| static OrderedHashmap *todo_uids = NULL, *todo_gids = NULL; |
| static OrderedHashmap *members = NULL; |
| |
| static Hashmap *database_by_uid = NULL, *database_by_username = NULL; |
| static Hashmap *database_by_gid = NULL, *database_by_groupname = NULL; |
| static Set *database_users = NULL, *database_groups = NULL; |
| |
| static uid_t search_uid = UID_INVALID; |
| static UidRange *uid_range = NULL; |
| static unsigned n_uid_range = 0; |
| |
| static UGIDAllocationRange login_defs = {}; |
| static bool login_defs_need_warning = false; |
| |
| STATIC_DESTRUCTOR_REGISTER(groups, ordered_hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(users, ordered_hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(members, ordered_hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(todo_uids, ordered_hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(todo_gids, ordered_hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_by_uid, hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_by_username, hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_users, set_free_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_by_gid, hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_by_groupname, hashmap_freep); |
| STATIC_DESTRUCTOR_REGISTER(database_groups, set_free_freep); |
| STATIC_DESTRUCTOR_REGISTER(uid_range, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_root, freep); |
| STATIC_DESTRUCTOR_REGISTER(arg_image, freep); |
| |
| static int errno_is_not_exists(int code) { |
| /* See getpwnam(3) and getgrnam(3): those codes and others can be returned if the user or group are |
| * not found. */ |
| return IN_SET(code, 0, ENOENT, ESRCH, EBADF, EPERM); |
| } |
| |
| static void maybe_emit_login_defs_warning(void) { |
| if (!login_defs_need_warning) |
| return; |
| |
| if (login_defs.system_alloc_uid_min != SYSTEM_ALLOC_UID_MIN || |
| login_defs.system_uid_max != SYSTEM_UID_MAX) |
| log_warning("login.defs specifies UID allocation range "UID_FMT"–"UID_FMT |
| " that is different than the built-in defaults ("UID_FMT"–"UID_FMT")", |
| login_defs.system_alloc_uid_min, login_defs.system_uid_max, |
| SYSTEM_ALLOC_UID_MIN, SYSTEM_UID_MAX); |
| if (login_defs.system_alloc_gid_min != SYSTEM_ALLOC_GID_MIN || |
| login_defs.system_gid_max != SYSTEM_GID_MAX) |
| log_warning("login.defs specifies GID allocation range "GID_FMT"–"GID_FMT |
| " that is different than the built-in defaults ("GID_FMT"–"GID_FMT")", |
| login_defs.system_alloc_gid_min, login_defs.system_gid_max, |
| SYSTEM_ALLOC_GID_MIN, SYSTEM_GID_MAX); |
| |
| login_defs_need_warning = false; |
| } |
| |
| static int load_user_database(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *passwd_path; |
| struct passwd *pw; |
| int r; |
| |
| passwd_path = prefix_roota(arg_root, "/etc/passwd"); |
| f = fopen(passwd_path, "re"); |
| if (!f) |
| return errno == ENOENT ? 0 : -errno; |
| |
| r = hashmap_ensure_allocated(&database_by_username, &string_hash_ops); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_ensure_allocated(&database_by_uid, NULL); |
| if (r < 0) |
| return r; |
| |
| r = set_ensure_allocated(&database_users, NULL); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetpwent_sane(f, &pw)) > 0) { |
| char *n; |
| int k, q; |
| |
| n = strdup(pw->pw_name); |
| if (!n) |
| return -ENOMEM; |
| |
| k = set_put(database_users, n); |
| if (k < 0) { |
| free(n); |
| return k; |
| } |
| |
| k = hashmap_put(database_by_username, n, UID_TO_PTR(pw->pw_uid)); |
| if (k < 0 && k != -EEXIST) |
| return k; |
| |
| q = hashmap_put(database_by_uid, UID_TO_PTR(pw->pw_uid), n); |
| if (q < 0 && q != -EEXIST) |
| return q; |
| } |
| return r; |
| } |
| |
| static int load_group_database(void) { |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *group_path; |
| struct group *gr; |
| int r; |
| |
| group_path = prefix_roota(arg_root, "/etc/group"); |
| f = fopen(group_path, "re"); |
| if (!f) |
| return errno == ENOENT ? 0 : -errno; |
| |
| r = hashmap_ensure_allocated(&database_by_groupname, &string_hash_ops); |
| if (r < 0) |
| return r; |
| |
| r = hashmap_ensure_allocated(&database_by_gid, NULL); |
| if (r < 0) |
| return r; |
| |
| r = set_ensure_allocated(&database_groups, NULL); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetgrent_sane(f, &gr)) > 0) { |
| char *n; |
| int k, q; |
| |
| n = strdup(gr->gr_name); |
| if (!n) |
| return -ENOMEM; |
| |
| k = set_put(database_groups, n); |
| if (k < 0) { |
| free(n); |
| return k; |
| } |
| |
| k = hashmap_put(database_by_groupname, n, GID_TO_PTR(gr->gr_gid)); |
| if (k < 0 && k != -EEXIST) |
| return k; |
| |
| q = hashmap_put(database_by_gid, GID_TO_PTR(gr->gr_gid), n); |
| if (q < 0 && q != -EEXIST) |
| return q; |
| } |
| return r; |
| } |
| |
| static int make_backup(const char *target, const char *x) { |
| _cleanup_(unlink_and_freep) char *dst_tmp = NULL; |
| _cleanup_fclose_ FILE *dst = NULL; |
| _cleanup_close_ int src = -1; |
| const char *backup; |
| struct stat st; |
| int r; |
| |
| assert(target); |
| assert(x); |
| |
| 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, /* The path for which to the lookup the label */ |
| x, /* Where we want the file actually to end up */ |
| &dst, |
| &dst_tmp /* The temporary file we write to */); |
| if (r < 0) |
| return r; |
| |
| r = copy_bytes(src, fileno(dst), (uint64_t) -1, COPY_REFLINK); |
| if (r < 0) |
| return r; |
| |
| backup = strjoina(x, "-"); |
| |
| /* Copy over the access mask. Don't fail on chmod() or chown(). If it stays owned by us and/or |
| * unreadable by others, then it isn't too bad... */ |
| r = fchmod_and_chown(fileno(dst), st.st_mode & 07777, st.st_uid, st.st_gid); |
| if (r < 0) |
| log_warning_errno(r, "Failed to change access mode or ownership of %s: %m", backup); |
| |
| if (futimens(fileno(dst), (const struct timespec[2]) { st.st_atim, st.st_mtim }) < 0) |
| log_warning_errno(errno, "Failed to fix access and modification time of %s: %m", backup); |
| |
| r = fsync_full(fileno(dst)); |
| if (r < 0) |
| return r; |
| |
| if (rename(dst_tmp, backup) < 0) |
| return errno; |
| |
| dst_tmp = mfree(dst_tmp); /* disable the unlink_and_freep() hook now that the file has been renamed*/ |
| return 0; |
| } |
| |
| static int putgrent_with_members(const struct group *gr, FILE *group) { |
| char **a; |
| |
| assert(gr); |
| assert(group); |
| |
| a = ordered_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; |
| int r; |
| |
| strv_uniq(l); |
| strv_sort(l); |
| |
| t = *gr; |
| t.gr_mem = l; |
| |
| r = putgrent_sane(&t, group); |
| return r < 0 ? r : 1; |
| } |
| } |
| |
| return putgrent_sane(gr, group); |
| } |
| |
| #if ENABLE_GSHADOW |
| static int putsgent_with_members(const struct sgrp *sg, FILE *gshadow) { |
| char **a; |
| |
| assert(sg); |
| assert(gshadow); |
| |
| a = ordered_hashmap_get(members, sg->sg_namp); |
| if (a) { |
| _cleanup_strv_free_ char **l = NULL; |
| bool added = false; |
| char **i; |
| |
| l = strv_copy(sg->sg_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 sgrp t; |
| int r; |
| |
| strv_uniq(l); |
| strv_sort(l); |
| |
| t = *sg; |
| t.sg_mem = l; |
| |
| r = putsgent_sane(&t, gshadow); |
| return r < 0 ? r : 1; |
| } |
| } |
| |
| return putsgent_sane(sg, gshadow); |
| } |
| #endif |
| |
| static const char* default_shell(uid_t uid) { |
| return uid == 0 ? "/bin/sh" : NOLOGIN; |
| } |
| |
| static int write_temporary_passwd(const char *passwd_path, FILE **tmpfile, char **tmpfile_path) { |
| _cleanup_fclose_ FILE *original = NULL, *passwd = NULL; |
| _cleanup_(unlink_and_freep) char *passwd_tmp = NULL; |
| struct passwd *pw = NULL; |
| Item *i; |
| int r; |
| |
| if (ordered_hashmap_size(todo_uids) == 0) |
| return 0; |
| |
| r = fopen_temporary_label("/etc/passwd", passwd_path, &passwd, &passwd_tmp); |
| if (r < 0) |
| return r; |
| |
| original = fopen(passwd_path, "re"); |
| if (original) { |
| |
| r = sync_rights(fileno(original), fileno(passwd)); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetpwent_sane(original, &pw)) > 0) { |
| |
| i = ordered_hashmap_get(users, pw->pw_name); |
| if (i && i->todo_user) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "%s: User \"%s\" already exists.", |
| passwd_path, pw->pw_name); |
| |
| if (ordered_hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid))) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "%s: Detected collision for UID " UID_FMT ".", |
| passwd_path, pw->pw_uid); |
| |
| /* Make sure we keep the NIS entries (if any) at the end. */ |
| if (IN_SET(pw->pw_name[0], '+', '-')) |
| break; |
| |
| r = putpwent_sane(pw, passwd); |
| if (r < 0) |
| return r; |
| } |
| if (r < 0) |
| return r; |
| |
| } else { |
| if (errno != ENOENT) |
| return -errno; |
| if (fchmod(fileno(passwd), 0644) < 0) |
| return -errno; |
| } |
| |
| ORDERED_HASHMAP_FOREACH(i, todo_uids) { |
| struct passwd n = { |
| .pw_name = i->name, |
| .pw_uid = i->uid, |
| .pw_gid = i->gid, |
| .pw_gecos = i->description, |
| |
| /* "x" means the password is stored in the shadow file */ |
| .pw_passwd = (char*) "x", |
| |
| /* We default to the root directory as home */ |
| .pw_dir = i->home ?: (char*) "/", |
| |
| /* Initialize the shell to nologin, with one exception: |
| * for root we patch in something special */ |
| .pw_shell = i->shell ?: (char*) default_shell(i->uid), |
| }; |
| |
| r = putpwent_sane(&n, passwd); |
| if (r < 0) |
| return r; |
| } |
| |
| /* Append the remaining NIS entries if any */ |
| while (pw) { |
| r = putpwent_sane(pw, passwd); |
| if (r < 0) |
| return r; |
| |
| r = fgetpwent_sane(original, &pw); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| } |
| |
| r = fflush_and_check(passwd); |
| if (r < 0) |
| return r; |
| |
| *tmpfile = TAKE_PTR(passwd); |
| *tmpfile_path = TAKE_PTR(passwd_tmp); |
| |
| return 0; |
| } |
| |
| static int write_temporary_shadow(const char *shadow_path, FILE **tmpfile, char **tmpfile_path) { |
| _cleanup_fclose_ FILE *original = NULL, *shadow = NULL; |
| _cleanup_(unlink_and_freep) char *shadow_tmp = NULL; |
| struct spwd *sp = NULL; |
| long lstchg; |
| Item *i; |
| int r; |
| |
| if (ordered_hashmap_size(todo_uids) == 0) |
| return 0; |
| |
| r = fopen_temporary_label("/etc/shadow", shadow_path, &shadow, &shadow_tmp); |
| if (r < 0) |
| return r; |
| |
| lstchg = (long) (now(CLOCK_REALTIME) / USEC_PER_DAY); |
| |
| original = fopen(shadow_path, "re"); |
| if (original) { |
| |
| r = sync_rights(fileno(original), fileno(shadow)); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetspent_sane(original, &sp)) > 0) { |
| |
| i = ordered_hashmap_get(users, sp->sp_namp); |
| if (i && i->todo_user) { |
| /* we will update the existing entry */ |
| sp->sp_lstchg = lstchg; |
| |
| /* only the /etc/shadow stage is left, so we can |
| * safely remove the item from the todo set */ |
| i->todo_user = false; |
| ordered_hashmap_remove(todo_uids, UID_TO_PTR(i->uid)); |
| } |
| |
| /* Make sure we keep the NIS entries (if any) at the end. */ |
| if (IN_SET(sp->sp_namp[0], '+', '-')) |
| break; |
| |
| r = putspent_sane(sp, shadow); |
| if (r < 0) |
| return r; |
| } |
| if (r < 0) |
| return r; |
| |
| } else { |
| if (errno != ENOENT) |
| return -errno; |
| if (fchmod(fileno(shadow), 0000) < 0) |
| return -errno; |
| } |
| |
| ORDERED_HASHMAP_FOREACH(i, todo_uids) { |
| struct spwd n = { |
| .sp_namp = i->name, |
| .sp_pwdp = (char*) "!*", /* lock this password, and make it invalid */ |
| .sp_lstchg = lstchg, |
| .sp_min = -1, |
| .sp_max = -1, |
| .sp_warn = -1, |
| .sp_inact = -1, |
| .sp_expire = -1, |
| .sp_flag = (unsigned long) -1, /* this appears to be what everybody does ... */ |
| }; |
| |
| r = putspent_sane(&n, shadow); |
| if (r < 0) |
| return r; |
| } |
| |
| /* Append the remaining NIS entries if any */ |
| while (sp) { |
| r = putspent_sane(sp, shadow); |
| if (r < 0) |
| return r; |
| |
| r = fgetspent_sane(original, &sp); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| } |
| if (!IN_SET(errno, 0, ENOENT)) |
| return -errno; |
| |
| r = fflush_sync_and_check(shadow); |
| if (r < 0) |
| return r; |
| |
| *tmpfile = TAKE_PTR(shadow); |
| *tmpfile_path = TAKE_PTR(shadow_tmp); |
| |
| return 0; |
| } |
| |
| static int write_temporary_group(const char *group_path, FILE **tmpfile, char **tmpfile_path) { |
| _cleanup_fclose_ FILE *original = NULL, *group = NULL; |
| _cleanup_(unlink_and_freep) char *group_tmp = NULL; |
| bool group_changed = false; |
| struct group *gr = NULL; |
| Item *i; |
| int r; |
| |
| if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0) |
| return 0; |
| |
| r = fopen_temporary_label("/etc/group", group_path, &group, &group_tmp); |
| if (r < 0) |
| return r; |
| |
| original = fopen(group_path, "re"); |
| if (original) { |
| |
| r = sync_rights(fileno(original), fileno(group)); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetgrent_sane(original, &gr)) > 0) { |
| /* 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 = ordered_hashmap_get(groups, gr->gr_name); |
| if (i && i->todo_group) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "%s: Group \"%s\" already exists.", |
| group_path, gr->gr_name); |
| |
| if (ordered_hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid))) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "%s: Detected collision for GID " GID_FMT ".", |
| group_path, gr->gr_gid); |
| |
| /* Make sure we keep the NIS entries (if any) at the end. */ |
| if (IN_SET(gr->gr_name[0], '+', '-')) |
| break; |
| |
| r = putgrent_with_members(gr, group); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| group_changed = true; |
| } |
| if (r < 0) |
| return r; |
| |
| } else { |
| if (errno != ENOENT) |
| return -errno; |
| if (fchmod(fileno(group), 0644) < 0) |
| return -errno; |
| } |
| |
| ORDERED_HASHMAP_FOREACH(i, todo_gids) { |
| struct group n = { |
| .gr_name = i->name, |
| .gr_gid = i->gid, |
| .gr_passwd = (char*) "x", |
| }; |
| |
| r = putgrent_with_members(&n, group); |
| if (r < 0) |
| return r; |
| |
| group_changed = true; |
| } |
| |
| /* Append the remaining NIS entries if any */ |
| while (gr) { |
| r = putgrent_sane(gr, group); |
| if (r < 0) |
| return r; |
| |
| r = fgetgrent_sane(original, &gr); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| break; |
| } |
| |
| r = fflush_sync_and_check(group); |
| if (r < 0) |
| return r; |
| |
| if (group_changed) { |
| *tmpfile = TAKE_PTR(group); |
| *tmpfile_path = TAKE_PTR(group_tmp); |
| } |
| return 0; |
| } |
| |
| static int write_temporary_gshadow(const char * gshadow_path, FILE **tmpfile, char **tmpfile_path) { |
| #if ENABLE_GSHADOW |
| _cleanup_fclose_ FILE *original = NULL, *gshadow = NULL; |
| _cleanup_(unlink_and_freep) char *gshadow_tmp = NULL; |
| bool group_changed = false; |
| Item *i; |
| int r; |
| |
| if (ordered_hashmap_size(todo_gids) == 0 && ordered_hashmap_size(members) == 0) |
| return 0; |
| |
| r = fopen_temporary_label("/etc/gshadow", gshadow_path, &gshadow, &gshadow_tmp); |
| if (r < 0) |
| return r; |
| |
| original = fopen(gshadow_path, "re"); |
| if (original) { |
| struct sgrp *sg; |
| |
| r = sync_rights(fileno(original), fileno(gshadow)); |
| if (r < 0) |
| return r; |
| |
| while ((r = fgetsgent_sane(original, &sg)) > 0) { |
| |
| i = ordered_hashmap_get(groups, sg->sg_namp); |
| if (i && i->todo_group) |
| return log_error_errno(SYNTHETIC_ERRNO(EEXIST), |
| "%s: Group \"%s\" already exists.", |
| gshadow_path, sg->sg_namp); |
| |
| r = putsgent_with_members(sg, gshadow); |
| if (r < 0) |
| return r; |
| if (r > 0) |
| group_changed = true; |
| } |
| if (r < 0) |
| return r; |
| |
| } else { |
| if (errno != ENOENT) |
| return -errno; |
| if (fchmod(fileno(gshadow), 0000) < 0) |
| return -errno; |
| } |
| |
| ORDERED_HASHMAP_FOREACH(i, todo_gids) { |
| struct sgrp n = { |
| .sg_namp = i->name, |
| .sg_passwd = (char*) "!*", |
| }; |
| |
| r = putsgent_with_members(&n, gshadow); |
| if (r < 0) |
| return r; |
| |
| group_changed = true; |
| } |
| |
| r = fflush_sync_and_check(gshadow); |
| if (r < 0) |
| return r; |
| |
| if (group_changed) { |
| *tmpfile = TAKE_PTR(gshadow); |
| *tmpfile_path = TAKE_PTR(gshadow_tmp); |
| } |
| return 0; |
| #else |
| return 0; |
| #endif |
| } |
| |
| static int write_files(void) { |
| _cleanup_fclose_ FILE *passwd = NULL, *group = NULL, *shadow = NULL, *gshadow = NULL; |
| _cleanup_(unlink_and_freep) char *passwd_tmp = NULL, *group_tmp = NULL, *shadow_tmp = NULL, *gshadow_tmp = NULL; |
| const char *passwd_path = NULL, *group_path = NULL, *shadow_path = NULL, *gshadow_path = NULL; |
| int r; |
| |
| passwd_path = prefix_roota(arg_root, "/etc/passwd"); |
| shadow_path = prefix_roota(arg_root, "/etc/shadow"); |
| group_path = prefix_roota(arg_root, "/etc/group"); |
| gshadow_path = prefix_roota(arg_root, "/etc/gshadow"); |
| |
| r = write_temporary_group(group_path, &group, &group_tmp); |
| if (r < 0) |
| return r; |
| |
| r = write_temporary_gshadow(gshadow_path, &gshadow, &gshadow_tmp); |
| if (r < 0) |
| return r; |
| |
| r = write_temporary_passwd(passwd_path, &passwd, &passwd_tmp); |
| if (r < 0) |
| return r; |
| |
| r = write_temporary_shadow(shadow_path, &shadow, &shadow_tmp); |
| if (r < 0) |
| return r; |
| |
| /* Make a backup of the old files */ |
| if (group) { |
| r = make_backup("/etc/group", group_path); |
| if (r < 0) |
| return r; |
| } |
| if (gshadow) { |
| r = make_backup("/etc/gshadow", gshadow_path); |
| if (r < 0) |
| return r; |
| } |
| |
| if (passwd) { |
| r = make_backup("/etc/passwd", passwd_path); |
| if (r < 0) |
| return r; |
| } |
| if (shadow) { |
| r = make_backup("/etc/shadow", shadow_path); |
| if (r < 0) |
| return r; |
| } |
| |
| /* And make the new files count */ |
| if (group) { |
| r = rename_and_apply_smack_floor_label(group_tmp, group_path); |
| if (r < 0) |
| return r; |
| |
| group_tmp = mfree(group_tmp); |
| } |
| if (gshadow) { |
| r = rename_and_apply_smack_floor_label(gshadow_tmp, gshadow_path); |
| if (r < 0) |
| return r; |
| |
| gshadow_tmp = mfree(gshadow_tmp); |
| } |
| |
| if (passwd) { |
| r = rename_and_apply_smack_floor_label(passwd_tmp, passwd_path); |
| if (r < 0) |
| return r; |
| |
| passwd_tmp = mfree(passwd_tmp); |
| } |
| if (shadow) { |
| r = rename_and_apply_smack_floor_label(shadow_tmp, shadow_path); |
| if (r < 0) |
| return r; |
| |
| shadow_tmp = mfree(shadow_tmp); |
| } |
| |
| return 0; |
| } |
| |
| static int uid_is_ok(uid_t uid, const char *name, bool check_with_gid) { |
| 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 (ordered_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. */ |
| if (check_with_gid) { |
| i = ordered_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_by_uid, UID_TO_PTR(uid))) |
| return 0; |
| |
| if (check_with_gid) { |
| n = hashmap_get(database_by_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; |
| |
| if (check_with_gid) { |
| 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 = prefix_roota(arg_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 = 0; |
| gid_t gid = 0; |
| |
| 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_by_username, 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; |
| |
| /* 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; |
| |
| r = free_and_strdup(&i->description, p->pw_gecos); |
| if (r < 0) |
| return log_oom(); |
| |
| return 0; |
| } |
| if (!errno_is_not_exists(errno)) |
| return log_error_errno(errno, "Failed to check if user %s already exists: %m", i->name); |
| } |
| |
| /* Try to use the suggested numeric uid */ |
| if (i->uid_set) { |
| r = uid_is_ok(i->uid, i->name, !i->id_set_strict); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid); |
| 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 || !uid_range_contains(uid_range, n_uid_range, c)) |
| log_debug("User ID " UID_FMT " of file not suitable for %s.", c, i->name); |
| else { |
| r = uid_is_ok(c, i->name, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid); |
| 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, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid); |
| 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) { |
| maybe_emit_login_defs_warning(); |
| |
| for (;;) { |
| r = uid_range_next_lower(uid_range, n_uid_range, &search_uid); |
| if (r < 0) |
| return log_error_errno(r, "No free user ID available for %s.", i->name); |
| |
| r = uid_is_ok(search_uid, i->name, true); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify uid " UID_FMT ": %m", i->uid); |
| else if (r > 0) |
| break; |
| } |
| |
| i->uid_set = true; |
| i->uid = search_uid; |
| } |
| |
| r = ordered_hashmap_ensure_allocated(&todo_uids, NULL); |
| if (r < 0) |
| return log_oom(); |
| |
| r = ordered_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 (ordered_hashmap_get(todo_gids, GID_TO_PTR(gid))) |
| return 0; |
| |
| /* Avoid reusing gids that are already used by a different user */ |
| if (ordered_hashmap_get(todo_uids, UID_TO_PTR(gid))) |
| return 0; |
| |
| if (hashmap_contains(database_by_gid, GID_TO_PTR(gid))) |
| return 0; |
| |
| if (hashmap_contains(database_by_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 get_gid_by_name(const char *name, gid_t *gid) { |
| void *z; |
| |
| assert(gid); |
| |
| /* Check the database directly */ |
| z = hashmap_get(database_by_groupname, name); |
| if (z) { |
| *gid = PTR_TO_GID(z); |
| return 0; |
| } |
| |
| /* Also check NSS */ |
| if (!arg_root) { |
| struct group *g; |
| |
| errno = 0; |
| g = getgrnam(name); |
| if (g) { |
| *gid = g->gr_gid; |
| return 0; |
| } |
| if (!errno_is_not_exists(errno)) |
| return log_error_errno(errno, "Failed to check if group %s already exists: %m", name); |
| } |
| |
| return -ENOENT; |
| } |
| |
| static int add_group(Item *i) { |
| int r; |
| |
| assert(i); |
| |
| r = get_gid_by_name(i->name, &i->gid); |
| if (r != -ENOENT) { |
| if (r < 0) |
| return r; |
| log_debug("Group %s already exists.", i->name); |
| i->gid_set = true; |
| return 0; |
| } |
| |
| /* Try to use the suggested numeric gid */ |
| if (i->gid_set) { |
| r = gid_is_ok(i->gid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid); |
| if (i->id_set_strict) { |
| /* If we require the gid to already exist we can return here: |
| * r > 0: means the gid does not exist -> fail |
| * r == 0: means the gid exists -> nothing more to do. |
| */ |
| if (r > 0) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Failed to create %s: please create GID %d", |
| i->name, i->gid); |
| if (r == 0) |
| return 0; |
| } |
| 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) |
| return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid); |
| 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 || !uid_range_contains(uid_range, n_uid_range, c)) |
| log_debug("Group ID " GID_FMT " of file not suitable for %s.", c, i->name); |
| else { |
| r = gid_is_ok(c); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid); |
| 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) { |
| maybe_emit_login_defs_warning(); |
| |
| for (;;) { |
| /* We look for new GIDs in the UID pool! */ |
| r = uid_range_next_lower(uid_range, n_uid_range, &search_uid); |
| if (r < 0) |
| return log_error_errno(r, "No free group ID available for %s.", i->name); |
| |
| r = gid_is_ok(search_uid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to verify gid " GID_FMT ": %m", i->gid); |
| else if (r > 0) |
| break; |
| } |
| |
| i->gid_set = true; |
| i->gid = search_uid; |
| } |
| |
| r = ordered_hashmap_ensure_allocated(&todo_gids, NULL); |
| if (r < 0) |
| return log_oom(); |
| |
| r = ordered_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: { |
| Item *j; |
| |
| j = ordered_hashmap_get(groups, i->group_name ?: i->name); |
| if (j && j->todo_group) { |
| /* When a group with the target name is already in queue, |
| * use the information about the group and do not create |
| * duplicated group entry. */ |
| i->gid_set = j->gid_set; |
| i->gid = j->gid; |
| i->id_set_strict = true; |
| } else if (i->group_name) { |
| /* When a group name was given instead of a GID and it's |
| * not in queue, then it must already exist. */ |
| r = get_gid_by_name(i->group_name, &i->gid); |
| if (r < 0) |
| return log_error_errno(r, "Group %s not found.", i->group_name); |
| i->gid_set = true; |
| i->id_set_strict = true; |
| } else { |
| r = add_group(i); |
| if (r < 0) |
| return r; |
| } |
| |
| return add_user(i); |
| } |
| |
| case ADD_GROUP: |
| return add_group(i); |
| |
| default: |
| assert_not_reached("Unknown item type"); |
| } |
| } |
| |
| static Item* item_free(Item *i) { |
| if (!i) |
| return NULL; |
| |
| free(i->name); |
| free(i->group_name); |
| free(i->uid_path); |
| free(i->gid_path); |
| free(i->description); |
| free(i->home); |
| free(i->shell); |
| return mfree(i); |
| } |
| |
| DEFINE_TRIVIAL_CLEANUP_FUNC(Item*, item_free); |
| DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(item_hash_ops, char, string_hash_func, string_compare_func, Item, item_free); |
| |
| static int add_implicit(void) { |
| char *g, **l; |
| int r; |
| |
| /* Implicitly create additional users and groups, if they were listed in "m" lines */ |
| ORDERED_HASHMAP_FOREACH_KEY(l, g, members) { |
| char **m; |
| |
| STRV_FOREACH(m, l) |
| if (!ordered_hashmap_get(users, *m)) { |
| _cleanup_(item_freep) Item *j = NULL; |
| |
| r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops); |
| 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 = ordered_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; |
| } |
| |
| if (!(ordered_hashmap_get(users, g) || |
| ordered_hashmap_get(groups, g))) { |
| _cleanup_(item_freep) Item *j = NULL; |
| |
| r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops); |
| 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 = ordered_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; |
| } |
| } |
| |
| 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; |
| |
| if (!streq_ptr(a->home, b->home)) |
| return false; |
| |
| if (!streq_ptr(a->shell, b->shell)) |
| return false; |
| |
| return true; |
| } |
| |
| static int parse_line(const char *fname, unsigned line, const char *buffer) { |
| |
| static const Specifier specifier_table[] = { |
| COMMON_SYSTEM_SPECIFIERS, |
| COMMON_TMP_SPECIFIERS, |
| {} |
| }; |
| |
| _cleanup_free_ char *action = NULL, |
| *name = NULL, *resolved_name = NULL, |
| *id = NULL, *resolved_id = NULL, |
| *description = NULL, *resolved_description = NULL, |
| *home = NULL, *resolved_home = NULL, |
| *shell = NULL, *resolved_shell = NULL; |
| _cleanup_(item_freep) Item *i = NULL; |
| Item *existing; |
| OrderedHashmap *h; |
| int r; |
| const char *p; |
| |
| assert(fname); |
| assert(line >= 1); |
| assert(buffer); |
| |
| /* Parse columns */ |
| p = buffer; |
| r = extract_many_words(&p, NULL, EXTRACT_UNQUOTE, |
| &action, &name, &id, &description, &home, &shell, NULL); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Syntax error.", fname, line); |
| if (r < 2) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Missing action and name columns.", fname, line); |
| if (!isempty(p)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Trailing garbage.", fname, line); |
| |
| /* Verify action */ |
| if (strlen(action) != 1) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Unknown modifier '%s'", fname, line, action); |
| |
| if (!IN_SET(action[0], ADD_USER, ADD_GROUP, ADD_MEMBER, ADD_RANGE)) |
| return log_error_errno(SYNTHETIC_ERRNO(EBADMSG), |
| "[%s:%u] Unknown command type '%c'.", fname, line, action[0]); |
| |
| /* Verify name */ |
| if (empty_or_dash(name)) |
| name = mfree(name); |
| |
| if (name) { |
| r = specifier_printf(name, specifier_table, NULL, &resolved_name); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", fname, line, name); |
| |
| if (!valid_user_group_name(resolved_name, 0)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] '%s' is not a valid user or group name.", |
| fname, line, resolved_name); |
| } |
| |
| /* Verify id */ |
| if (empty_or_dash(id)) |
| id = mfree(id); |
| |
| if (id) { |
| r = specifier_printf(id, specifier_table, NULL, &resolved_id); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", |
| fname, line, name); |
| } |
| |
| /* Verify description */ |
| if (empty_or_dash(description)) |
| description = mfree(description); |
| |
| if (description) { |
| r = specifier_printf(description, specifier_table, NULL, &resolved_description); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", |
| fname, line, description); |
| |
| if (!valid_gecos(resolved_description)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] '%s' is not a valid GECOS field.", |
| fname, line, resolved_description); |
| } |
| |
| /* Verify home */ |
| if (empty_or_dash(home)) |
| home = mfree(home); |
| |
| if (home) { |
| r = specifier_printf(home, specifier_table, NULL, &resolved_home); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", |
| fname, line, home); |
| |
| if (!valid_home(resolved_home)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] '%s' is not a valid home directory field.", |
| fname, line, resolved_home); |
| } |
| |
| /* Verify shell */ |
| if (empty_or_dash(shell)) |
| shell = mfree(shell); |
| |
| if (shell) { |
| r = specifier_printf(shell, specifier_table, NULL, &resolved_shell); |
| if (r < 0) |
| return log_error_errno(r, "[%s:%u] Failed to replace specifiers in '%s': %m", |
| fname, line, shell); |
| |
| if (!valid_shell(resolved_shell)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] '%s' is not a valid login shell field.", |
| fname, line, resolved_shell); |
| } |
| |
| switch (action[0]) { |
| |
| case ADD_RANGE: |
| if (resolved_name) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'r' don't take a name field.", |
| fname, line); |
| |
| if (!resolved_id) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'r' require a ID range in the third field.", |
| fname, line); |
| |
| if (description || home || shell) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type '%c' don't take a %s field.", |
| fname, line, action[0], |
| description ? "GECOS" : home ? "home directory" : "login shell"); |
| |
| r = uid_range_add_str(&uid_range, &n_uid_range, resolved_id); |
| if (r < 0) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Invalid UID range %s.", fname, line, resolved_id); |
| |
| return 0; |
| |
| case ADD_MEMBER: { |
| /* Try to extend an existing member or group item */ |
| if (!name) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'm' require a user name in the second field.", |
| fname, line); |
| |
| if (!resolved_id) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'm' require a group name in the third field.", |
| fname, line); |
| |
| if (!valid_user_group_name(resolved_id, 0)) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] '%s' is not a valid user or group name.", |
| fname, line, resolved_id); |
| |
| if (description || home || shell) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type '%c' don't take a %s field.", |
| fname, line, action[0], |
| description ? "GECOS" : home ? "home directory" : "login shell"); |
| |
| r = string_strv_ordered_hashmap_put(&members, resolved_id, resolved_name); |
| if (r < 0) |
| return log_error_errno(r, "Failed to store mapping for %s: %m", resolved_id); |
| |
| return 0; |
| } |
| |
| case ADD_USER: |
| if (!name) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'u' require a user name in the second field.", |
| fname, line); |
| |
| r = ordered_hashmap_ensure_allocated(&users, &item_hash_ops); |
| if (r < 0) |
| return log_oom(); |
| |
| i = new0(Item, 1); |
| if (!i) |
| return log_oom(); |
| |
| if (resolved_id) { |
| if (path_is_absolute(resolved_id)) { |
| i->uid_path = TAKE_PTR(resolved_id); |
| path_simplify(i->uid_path, false); |
| } else { |
| _cleanup_free_ char *uid = NULL, *gid = NULL; |
| if (split_pair(resolved_id, ":", &uid, &gid) == 0) { |
| r = parse_gid(gid, &i->gid); |
| if (r < 0) { |
| if (valid_user_group_name(gid, 0)) |
| i->group_name = TAKE_PTR(gid); |
| else |
| return log_error_errno(r, "Failed to parse GID: '%s': %m", id); |
| } else { |
| i->gid_set = true; |
| i->id_set_strict = true; |
| } |
| free_and_replace(resolved_id, uid); |
| } |
| if (!streq(resolved_id, "-")) { |
| r = parse_uid(resolved_id, &i->uid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse UID: '%s': %m", id); |
| i->uid_set = true; |
| } |
| } |
| } |
| |
| i->description = TAKE_PTR(resolved_description); |
| i->home = TAKE_PTR(resolved_home); |
| i->shell = TAKE_PTR(resolved_shell); |
| |
| h = users; |
| break; |
| |
| case ADD_GROUP: |
| if (!name) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type 'g' require a user name in the second field.", |
| fname, line); |
| |
| if (description || home || shell) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "[%s:%u] Lines of type '%c' don't take a %s field.", |
| fname, line, action[0], |
| description ? "GECOS" : home ? "home directory" : "login shell"); |
| |
| r = ordered_hashmap_ensure_allocated(&groups, &item_hash_ops); |
| if (r < 0) |
| return log_oom(); |
| |
| i = new0(Item, 1); |
| if (!i) |
| return log_oom(); |
| |
| if (resolved_id) { |
| if (path_is_absolute(resolved_id)) { |
| i->gid_path = TAKE_PTR(resolved_id); |
| path_simplify(i->gid_path, false); |
| } else { |
| r = parse_gid(resolved_id, &i->gid); |
| if (r < 0) |
| return log_error_errno(r, "Failed to parse GID: '%s': %m", id); |
| |
| i->gid_set = true; |
| } |
| } |
| |
| h = groups; |
| break; |
| |
| default: |
| return -EBADMSG; |
| } |
| |
| i->type = action[0]; |
| i->name = TAKE_PTR(resolved_name); |
| |
| existing = ordered_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 = ordered_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 *rf = NULL; |
| FILE *f = NULL; |
| unsigned v = 0; |
| int r = 0; |
| |
| assert(fn); |
| |
| if (streq(fn, "-")) |
| f = stdin; |
| else { |
| r = search_and_fopen(fn, "re", arg_root, (const char**) CONF_PATHS_STRV("sysusers.d"), &rf); |
| if (r < 0) { |
| if (ignore_enoent && r == -ENOENT) |
| return 0; |
| |
| return log_error_errno(r, "Failed to open '%s', ignoring: %m", fn); |
| } |
| |
| f = rf; |
| } |
| |
| for (;;) { |
| _cleanup_free_ char *line = NULL; |
| char *l; |
| int k; |
| |
| k = read_line(f, LONG_LINE_MAX, &line); |
| if (k < 0) |
| return log_error_errno(k, "Failed to read '%s': %m", fn); |
| if (k == 0) |
| break; |
| |
| v++; |
| |
| l = strstrip(line); |
| if (IN_SET(*l, 0, '#')) |
| continue; |
| |
| k = parse_line(fn, v, l); |
| if (k < 0 && r == 0) |
| r = k; |
| } |
| |
| if (ferror(f)) { |
| log_error_errno(errno, "Failed to read from file %s: %m", fn); |
| if (r == 0) |
| r = -EIO; |
| } |
| |
| return r; |
| } |
| |
| static int cat_config(void) { |
| _cleanup_strv_free_ char **files = NULL; |
| int r; |
| |
| r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, NULL); |
| if (r < 0) |
| return r; |
| |
| (void) pager_open(arg_pager_flags); |
| |
| return cat_files(NULL, files, 0); |
| } |
| |
| static int help(void) { |
| _cleanup_free_ char *link = NULL; |
| int r; |
| |
| r = terminal_urlify_man("systemd-sysusers.service", "8", &link); |
| if (r < 0) |
| return log_oom(); |
| |
| printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" |
| "Creates system user accounts.\n\n" |
| " -h --help Show this help\n" |
| " --version Show package version\n" |
| " --cat-config Show configuration files\n" |
| " --root=PATH Operate on an alternate filesystem root\n" |
| " --image=PATH Operate on disk image as filesystem root\n" |
| " --replace=PATH Treat arguments as replacement for PATH\n" |
| " --inline Treat arguments as configuration lines\n" |
| " --no-pager Do not pipe output into a pager\n" |
| "\nSee the %s for details.\n" |
| , program_invocation_short_name |
| , link |
| ); |
| |
| return 0; |
| } |
| |
| static int parse_argv(int argc, char *argv[]) { |
| |
| enum { |
| ARG_VERSION = 0x100, |
| ARG_CAT_CONFIG, |
| ARG_ROOT, |
| ARG_IMAGE, |
| ARG_REPLACE, |
| ARG_INLINE, |
| ARG_NO_PAGER, |
| }; |
| |
| static const struct option options[] = { |
| { "help", no_argument, NULL, 'h' }, |
| { "version", no_argument, NULL, ARG_VERSION }, |
| { "cat-config", no_argument, NULL, ARG_CAT_CONFIG }, |
| { "root", required_argument, NULL, ARG_ROOT }, |
| { "image", required_argument, NULL, ARG_IMAGE }, |
| { "replace", required_argument, NULL, ARG_REPLACE }, |
| { "inline", no_argument, NULL, ARG_INLINE }, |
| { "no-pager", no_argument, NULL, ARG_NO_PAGER }, |
| {} |
| }; |
| |
| int c, r; |
| |
| assert(argc >= 0); |
| assert(argv); |
| |
| while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) |
| |
| switch (c) { |
| |
| case 'h': |
| return help(); |
| |
| case ARG_VERSION: |
| return version(); |
| |
| case ARG_CAT_CONFIG: |
| arg_cat_config = true; |
| break; |
| |
| case ARG_ROOT: |
| r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_root); |
| if (r < 0) |
| return r; |
| break; |
| |
| case ARG_IMAGE: |
| #ifdef STANDALONE |
| return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), |
| "This systemd-sysusers version is compiled without support for --image=."); |
| #else |
| r = parse_path_argument_and_warn(optarg, /* suppress_root= */ false, &arg_image); |
| if (r < 0) |
| return r; |
| break; |
| #endif |
| |
| case ARG_REPLACE: |
| if (!path_is_absolute(optarg) || |
| !endswith(optarg, ".conf")) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "The argument to --replace= must an absolute path to a config file"); |
| |
| arg_replace = optarg; |
| break; |
| |
| case ARG_INLINE: |
| arg_inline = true; |
| break; |
| |
| case ARG_NO_PAGER: |
| arg_pager_flags |= PAGER_DISABLE; |
| break; |
| |
| case '?': |
| return -EINVAL; |
| |
| default: |
| assert_not_reached("Unhandled option"); |
| } |
| |
| if (arg_replace && arg_cat_config) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "Option --replace= is not supported with --cat-config"); |
| |
| if (arg_replace && optind >= argc) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
| "When --replace= is given, some configuration items must be specified"); |
| |
| if (arg_image && arg_root) |
| return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Please specify either --root= or --image=, the combination of both is not supported."); |
| |
| return 1; |
| } |
| |
| static int parse_arguments(char **args) { |
| char **arg; |
| unsigned pos = 1; |
| int r; |
| |
| STRV_FOREACH(arg, args) { |
| if (arg_inline) |
| /* Use (argument):n, where n==1 for the first positional arg */ |
| r = parse_line("(argument)", pos, *arg); |
| else |
| r = read_config_file(*arg, false); |
| if (r < 0) |
| return r; |
| |
| pos++; |
| } |
| |
| return 0; |
| } |
| |
| static int read_config_files(char **args) { |
| _cleanup_strv_free_ char **files = NULL; |
| _cleanup_free_ char *p = NULL; |
| char **f; |
| int r; |
| |
| r = conf_files_list_with_replacement(arg_root, CONF_PATHS_STRV("sysusers.d"), arg_replace, &files, &p); |
| if (r < 0) |
| return r; |
| |
| STRV_FOREACH(f, files) |
| if (p && path_equal(*f, p)) { |
| log_debug("Parsing arguments at position \"%s\"…", *f); |
| |
| r = parse_arguments(args); |
| if (r < 0) |
| return r; |
| } else { |
| log_debug("Reading config file \"%s\"…", *f); |
| |
| /* Just warn, ignore result otherwise */ |
| (void) read_config_file(*f, true); |
| } |
| |
| return 0; |
| } |
| |
| static int run(int argc, char *argv[]) { |
| #ifndef STANDALONE |
| _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; |
| _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; |
| _cleanup_(umount_and_rmdir_and_freep) char *unlink_dir = NULL; |
| #endif |
| _cleanup_close_ int lock = -1; |
| Item *i; |
| int r; |
| |
| r = parse_argv(argc, argv); |
| if (r <= 0) |
| return r; |
| |
| log_setup_service(); |
| |
| if (arg_cat_config) |
| return cat_config(); |
| |
| umask(0022); |
| |
| r = mac_selinux_init(); |
| if (r < 0) |
| return r; |
| |
| #ifndef STANDALONE |
| if (arg_image) { |
| assert(!arg_root); |
| |
| r = mount_image_privately_interactively( |
| arg_image, |
| DISSECT_IMAGE_REQUIRE_ROOT|DISSECT_IMAGE_VALIDATE_OS|DISSECT_IMAGE_RELAX_VAR_CHECK|DISSECT_IMAGE_FSCK, |
| &unlink_dir, |
| &loop_device, |
| &decrypted_image); |
| if (r < 0) |
| return r; |
| |
| arg_root = strdup(unlink_dir); |
| if (!arg_root) |
| return log_oom(); |
| } |
| #else |
| assert(!arg_image); |
| #endif |
| |
| /* If command line arguments are specified along with --replace, read all |
| * configuration files and insert the positional arguments at the specified |
| * place. Otherwise, if command line arguments are specified, execute just |
| * them, and finally, without --replace= or any positional arguments, just |
| * read configuration and execute it. |
| */ |
| if (arg_replace || optind >= argc) |
| r = read_config_files(argv + optind); |
| else |
| r = parse_arguments(argv + optind); |
| if (r < 0) |
| return r; |
| |
| /* Let's tell nss-systemd not to synthesize the "root" and "nobody" entries for it, so that our detection |
| * whether the names or UID/GID area already used otherwise doesn't get confused. After all, even though |
| * nss-systemd synthesizes these users/groups, they should still appear in /etc/passwd and /etc/group, as the |
| * synthesizing logic is merely supposed to be fallback for cases where we run with a completely unpopulated |
| * /etc. */ |
| if (setenv("SYSTEMD_NSS_BYPASS_SYNTHETIC", "1", 1) < 0) |
| return log_error_errno(errno, "Failed to set SYSTEMD_NSS_BYPASS_SYNTHETIC environment variable: %m"); |
| |
| if (!uid_range) { |
| /* Default to default range of SYSTEMD_UID_MIN..SYSTEM_UID_MAX. */ |
| r = read_login_defs(&login_defs, NULL, arg_root); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read %s%s: %m", |
| strempty(arg_root), "/etc/login.defs"); |
| |
| login_defs_need_warning = true; |
| |
| /* We pick a range that very conservative: we look at compiled-in maximum and the value in |
| * /etc/login.defs. That way the uids/gids which we allocate will be interpreted correctly, |
| * even if /etc/login.defs is removed later. (The bottom bound doesn't matter much, since |
| * it's only used during allocation, so we use the configured value directly). */ |
| uid_t begin = login_defs.system_alloc_uid_min, |
| end = MIN3((uid_t) SYSTEM_UID_MAX, login_defs.system_uid_max, login_defs.system_gid_max); |
| if (begin < end) { |
| r = uid_range_add(&uid_range, &n_uid_range, begin, end - begin + 1); |
| if (r < 0) |
| return log_oom(); |
| } |
| } |
| |
| r = add_implicit(); |
| if (r < 0) |
| return r; |
| |
| lock = take_etc_passwd_lock(arg_root); |
| if (lock < 0) |
| return log_error_errno(lock, "Failed to take /etc/passwd lock: %m"); |
| |
| r = load_user_database(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to load user database: %m"); |
| |
| r = load_group_database(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to read group database: %m"); |
| |
| ORDERED_HASHMAP_FOREACH(i, groups) |
| (void) process_item(i); |
| |
| ORDERED_HASHMAP_FOREACH(i, users) |
| (void) process_item(i); |
| |
| r = write_files(); |
| if (r < 0) |
| return log_error_errno(r, "Failed to write files: %m"); |
| |
| return 0; |
| } |
| |
| DEFINE_MAIN_FUNCTION(run); |