/*-*- 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 .
***/
#include
#include
#include
#include
#include
#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"
typedef enum ItemType {
ADD_USER = 'u',
ADD_GROUP = 'g',
} 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:1;
} Item;
static char *arg_root = NULL;
static const char conf_file_dirs[] =
"/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 *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 *x) {
_cleanup_close_ int src = -1, dst = -1;
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;
temp = strappenda(x, ".XXXXXX");
dst = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC|O_NOCTTY);
if (dst < 0)
return dst;
r = copy_bytes(src, dst);
if (r < 0)
goto fail;
/* Copy over the access mask */
if (fchmod(dst, st.st_mode & 07777) < 0) {
r = -errno;
goto fail;
}
/* Don't fail on chmod(). If it stays owned by us, then it
* isn't too bad... */
fchown(dst, st.st_uid, st.st_gid);
ts[0] = st.st_atim;
ts[1] = st.st_mtim;
futimens(dst, ts);
backup = strappenda(x, "-");
if (rename(temp, backup) < 0)
goto fail;
return 0;
fail:
unlink(temp);
return r;
}
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;
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) {
_cleanup_fclose_ FILE *original = NULL;
group_path = fix_root("/etc/group");
r = fopen_temporary(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) {
r = -EEXIST;
goto finish;
}
if (hashmap_contains(todo_gids, GID_TO_PTR(gr->gr_gid))) {
r = -EEXIST;
goto finish;
}
if (putgrent(gr, group) < 0) {
r = -errno;
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_gids, iterator) {
struct group n = {
.gr_name = i->name,
.gr_gid = i->gid,
.gr_passwd = (char*) "x",
};
if (putgrent(&n, group) < 0) {
r = -errno;
goto finish;
}
}
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(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) {
r = -EEXIST;
goto finish;
}
if (hashmap_contains(todo_uids, UID_TO_PTR(pw->pw_uid))) {
r = -EEXIST;
goto finish;
}
if (putpwent(pw, passwd) < 0) {
r = -errno;
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*) "/";
}
if (putpwent(&n, passwd) < 0) {
r = -r;
goto finish;
}
}
r = fflush_and_check(passwd);
if (r < 0)
goto finish;
}
/* Make a backup of the old files */
if (group) {
r = make_backup(group_path);
if (r < 0)
goto finish;
}
if (passwd) {
r = make_backup(passwd_path);
if (r < 0)
goto finish;
}
/* And make the new files count */
if (group) {
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;
}
return 0;
finish:
if (r < 0) {
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 (errno != 0)
return -errno;
errno = 0;
g = getgrgid((gid_t) uid);
if (g) {
if (!streq(g->gr_name, name))
return 0;
} else if (errno != 0)
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_GID(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 (errno != 0) {
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 (errno != 0) {
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 = 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 (errno != 0)
return -errno;
errno = 0;
p = getpwuid((uid_t) gid);
if (p)
return 0;
if (errno != 0)
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 (errno != 0) {
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 = 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);
}
}
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 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;
return true;
}
static bool valid_gecos(const char *d) {
if (!utf8_is_valid(d))
return false;
if (strpbrk(d, ":\n"))
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;
_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)) {
log_error("[%s:%u] Unknown command command type '%c'.", fname, line, action[0]);
return -EBADMSG;
}
i = new0(Item, 1);
if (!i)
return log_oom();
i->type = action[0];
r = specifier_printf(name, specifier_table, NULL, &i->name);
if (r < 0) {
log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, name);
return r;
}
if (!valid_user_group_name(i->name)) {
log_error("[%s:%u] '%s' is not a valid user or group name.", fname, line, i->name);
return -EINVAL;
}
if (n >= 0) {
n += strspn(buffer+n, WHITESPACE);
if (buffer[n] != 0 && (buffer[n] != '-' || buffer[n+1] != 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;
}
}
}
if (id && !streq(id, "-")) {
if (path_is_absolute(id)) {
char *p;
p = strdup(id);
if (!p)
return log_oom();
path_kill_slashes(p);
if (i->type == ADD_USER)
i->uid_path = p;
else
i->gid_path = p;
} else if (i->type == ADD_USER) {
r = parse_uid(id, &i->uid);
if (r < 0) {
log_error("Failed to parse UID: %s", id);
return -EBADMSG;
}
i->uid_set = true;
} else {
assert(i->type == ADD_GROUP);
r = parse_gid(id, &i->gid);
if (r < 0) {
log_error("Failed to parse GID: %s", id);
return -EBADMSG;
}
i->gid_set = true;
}
}
if (i->type == ADD_USER) {
r = hashmap_ensure_allocated(&users, string_hash_func, string_compare_func);
h = users;
} else {
assert(i->type == ADD_GROUP);
r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func);
h = groups;
}
if (r < 0)
return log_oom();
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) {
log_error("Failed to insert item %s: %s", i->name, strerror(-r));
return r;
}
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;
r = parse_argv(argc, argv);
if (r <= 0)
goto finish;
log_set_target(LOG_TARGET_AUTO);
log_parse_environment();
log_open();
umask(0022);
r = 0;
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;
}
}
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);
hashmap_free(groups);
hashmap_free(users);
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;
}