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2c7bdaf9f144ad339c72628579183fc849f2b794
systemd/src/shared/userdb.c
Lennart Poettering 2c7bdaf9f1 dlfcn-util: let's make our dlopen() code fail if we enter a container namespace 
Now that we dlopen() so many deps, it might happen by accident that we
end up dlopen()ening stuff when we entered a container, which we should
really avoid, to not mix host and container libraries.

Let's add a global variable we can set when we want to block dlopen() to
ever succeed. This is then checked primarily in
dlopen_many_sym_or_warn(), where we'll generate EPERM plus a log
message.

There are a couple of other places we invoke dlopen(), without going
through dlopen_many_sym_or_warn(). This adds the same check there.
2025-11-24 09:19:33 +01:00

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <gshadow.h>
#include <stdlib.h>
#include "sd-event.h"
#include "sd-varlink.h"
#include "alloc-util.h"
#include "bitfield.h"
#include "conf-files.h"
#include "dirent-util.h"
#include "dlfcn-util.h"
#include "errno-util.h"
#include "fd-util.h"
#include "format-util.h"
#include "json-util.h"
#include "log.h"
#include "parse-util.h"
#include "set.h"
#include "string-util.h"
#include "strv.h"
#include "uid-classification.h"
#include "user-record-nss.h"
#include "user-util.h"
#include "userdb.h"
#include "userdb-dropin.h"
DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(link_hash_ops, void, trivial_hash_func, trivial_compare_func, sd_varlink, sd_varlink_unref);
typedef enum LookupWhat {
LOOKUP_USER,
LOOKUP_GROUP,
LOOKUP_MEMBERSHIP,
_LOOKUP_WHAT_MAX,
} LookupWhat;
struct UserDBIterator {
LookupWhat what;
UserDBFlags flags;
Set *links;
const char *method; /* Note, this is a const static string! */
sd_json_variant *query;
bool more:1;
bool nss_covered:1;
bool nss_iterating:1;
bool dropin_covered:1;
bool synthesize_root:1;
bool synthesize_nobody:1;
bool nss_systemd_blocked:1;
char **dropins;
size_t current_dropin;
int error;
unsigned n_found;
sd_event *event;
UserRecord *found_user; /* when .what == LOOKUP_USER */
GroupRecord *found_group; /* when .what == LOOKUP_GROUP */
char *found_user_name, *found_group_name; /* when .what == LOOKUP_MEMBERSHIP */
char **members_of_group;
size_t index_members_of_group;
char *filter_user_name, *filter_group_name;
};
static int userdb_connect(UserDBIterator *iterator, const char *path, const char *method, bool more, sd_json_variant *query);
UserDBIterator* userdb_iterator_free(UserDBIterator *iterator) {
if (!iterator)
return NULL;
sd_json_variant_unref(iterator->query);
set_free(iterator->links);
strv_free(iterator->dropins);
switch (iterator->what) {
case LOOKUP_USER:
user_record_unref(iterator->found_user);
if (iterator->nss_iterating)
endpwent();
break;
case LOOKUP_GROUP:
group_record_unref(iterator->found_group);
if (iterator->nss_iterating)
endgrent();
break;
case LOOKUP_MEMBERSHIP:
free(iterator->found_user_name);
free(iterator->found_group_name);
strv_free(iterator->members_of_group);
free(iterator->filter_user_name);
free(iterator->filter_group_name);
if (iterator->nss_iterating)
endgrent();
break;
default:
assert_not_reached();
}
sd_event_unref(iterator->event);
if (iterator->nss_systemd_blocked)
assert_se(userdb_block_nss_systemd(false) >= 0);
return mfree(iterator);
}
static UserDBIterator* userdb_iterator_new(LookupWhat what, UserDBFlags flags) {
UserDBIterator *i;
assert(what >= 0);
assert(what < _LOOKUP_WHAT_MAX);
i = new(UserDBIterator, 1);
if (!i)
return NULL;
*i = (UserDBIterator) {
.what = what,
.flags = flags,
.synthesize_root = !FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC),
.synthesize_nobody = !FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC),
};
return i;
}
static int userdb_iterator_block_nss_systemd(UserDBIterator *iterator) {
int r;
assert(iterator);
if (iterator->nss_systemd_blocked)
return 0;
r = userdb_block_nss_systemd(true);
if (r < 0)
return r;
iterator->nss_systemd_blocked = true;
return 1;
}
struct user_group_data {
sd_json_variant *record;
bool incomplete;
};
static void user_group_data_done(struct user_group_data *d) {
sd_json_variant_unref(d->record);
}
struct membership_data {
char *user_name;
char *group_name;
};
static void membership_data_done(struct membership_data *d) {
free(d->user_name);
free(d->group_name);
}
static int userdb_maybe_restart_query(
UserDBIterator *iterator,
sd_varlink *link,
sd_json_variant *parameters,
const char *error_id) {
int r;
assert(iterator);
assert(link);
assert(error_id);
/* These fields were added in v258 and didn't exist in previous implementations. Hence, we consider
* their support optional: if any service refuses any of these fields, we'll restart the query
* without them, and apply the filtering they are supposed to do client side. */
static const char *const fields[] = {
"fuzzyNames",
"dispositionMask",
"uidMin",
"uidMax",
"gidMin",
"gidMax",
NULL
};
/* Figure out if the reported error indicates any of the suppressible fields are at fault, and that
* our query actually included them */
bool restart = false;
STRV_FOREACH(f, fields) {
if (!sd_varlink_error_is_invalid_parameter(error_id, parameters, *f))
continue;
if (!sd_json_variant_by_key(iterator->query, *f))
continue;
restart = true;
break;
}
if (!restart)
return 0;
/* Now patch the fields out */
_cleanup_(sd_json_variant_unrefp) sd_json_variant *patched_query =
sd_json_variant_ref(iterator->query);
r = sd_json_variant_filter(&patched_query, (char**const) fields);
if (r < 0)
return r;
/* NB: we stored the socket path in the varlink connection description when we set things up here! */
r = userdb_connect(
iterator,
ASSERT_PTR(sd_varlink_get_description(link)),
iterator->method,
iterator->more,
patched_query);
if (r < 0)
return r;
log_debug("Restarted query to service '%s' due to missing features.", sd_varlink_get_description(link));
return 1;
}
static int userdb_on_query_reply(
sd_varlink *link,
sd_json_variant *parameters,
const char *error_id,
sd_varlink_reply_flags_t flags,
void *userdata) {
UserDBIterator *iterator = ASSERT_PTR(userdata);
int r;
if (error_id) {
log_debug("Got lookup error: %s", error_id);
r = userdb_maybe_restart_query(iterator, link, parameters, error_id);
if (r < 0)
return r;
if (r > 0) {
r = 0;
goto finish;
}
/* Convert various forms of record not found into -ESRCH, since NSS typically doesn't care,
* about the details. Note that if a userName specification is refused as invalid parameter,
* we also turn this into -ESRCH following the logic that there cannot be a user record for a
* completely invalid user name. */
if (STR_IN_SET(error_id,
"io.systemd.UserDatabase.NoRecordFound",
"io.systemd.UserDatabase.ConflictingRecordFound") ||
sd_varlink_error_is_invalid_parameter(error_id, parameters, "userName") ||
sd_varlink_error_is_invalid_parameter(error_id, parameters, "groupName"))
r = -ESRCH;
else if (streq(error_id, "io.systemd.UserDatabase.NonMatchingRecordFound"))
r = -ENOEXEC;
else if (streq(error_id, "io.systemd.UserDatabase.ServiceNotAvailable"))
r = -EHOSTDOWN;
else if (streq(error_id, "io.systemd.UserDatabase.EnumerationNotSupported"))
r = -EOPNOTSUPP;
else if (streq(error_id, SD_VARLINK_ERROR_TIMEOUT))
r = -ETIMEDOUT;
else
r = -EIO;
goto finish;
}
switch (iterator->what) {
case LOOKUP_USER: {
_cleanup_(user_group_data_done) struct user_group_data user_data = {};
static const sd_json_dispatch_field dispatch_table[] = {
{ "record", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_variant, offsetof(struct user_group_data, record), 0 },
{ "incomplete", SD_JSON_VARIANT_BOOLEAN, sd_json_dispatch_stdbool, offsetof(struct user_group_data, incomplete), 0 },
{}
};
_cleanup_(user_record_unrefp) UserRecord *hr = NULL;
assert_se(!iterator->found_user);
r = sd_json_dispatch(parameters, dispatch_table, SD_JSON_ALLOW_EXTENSIONS, &user_data);
if (r < 0)
goto finish;
if (!user_data.record) {
r = log_debug_errno(SYNTHETIC_ERRNO(EIO), "Reply is missing record key");
goto finish;
}
hr = user_record_new();
if (!hr) {
r = -ENOMEM;
goto finish;
}
r = user_record_load(hr, user_data.record, USER_RECORD_LOAD_REFUSE_SECRET|USER_RECORD_PERMISSIVE);
if (r < 0)
goto finish;
if (!hr->service) {
r = log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "User record does not carry service information, refusing.");
goto finish;
}
hr->incomplete = user_data.incomplete;
/* We match the root user by the name since the name is our primary key. We match the nobody
* use by UID though, since the name might differ on OSes */
if (streq_ptr(hr->user_name, "root"))
iterator->synthesize_root = false;
if (hr->uid == UID_NOBODY)
iterator->synthesize_nobody = false;
iterator->found_user = TAKE_PTR(hr);
iterator->n_found++;
/* More stuff coming? then let's just exit cleanly here */
if (FLAGS_SET(flags, SD_VARLINK_REPLY_CONTINUES))
return 0;
/* Otherwise, let's remove this link and exit cleanly then */
r = 0;
goto finish;
}
case LOOKUP_GROUP: {
_cleanup_(user_group_data_done) struct user_group_data group_data = {};
static const sd_json_dispatch_field dispatch_table[] = {
{ "record", _SD_JSON_VARIANT_TYPE_INVALID, sd_json_dispatch_variant, offsetof(struct user_group_data, record), 0 },
{ "incomplete", SD_JSON_VARIANT_BOOLEAN, sd_json_dispatch_stdbool, offsetof(struct user_group_data, incomplete), 0 },
{}
};
_cleanup_(group_record_unrefp) GroupRecord *g = NULL;
assert_se(!iterator->found_group);
r = sd_json_dispatch(parameters, dispatch_table, SD_JSON_ALLOW_EXTENSIONS, &group_data);
if (r < 0)
goto finish;
if (!group_data.record) {
r = log_debug_errno(SYNTHETIC_ERRNO(EIO), "Reply is missing record key");
goto finish;
}
g = group_record_new();
if (!g) {
r = -ENOMEM;
goto finish;
}
r = group_record_load(g, group_data.record, USER_RECORD_LOAD_REFUSE_SECRET|USER_RECORD_PERMISSIVE);
if (r < 0)
goto finish;
if (!g->service) {
r = log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Group record does not carry service information, refusing.");
goto finish;
}
g->incomplete = group_data.incomplete;
if (streq_ptr(g->group_name, "root"))
iterator->synthesize_root = false;
if (g->gid == GID_NOBODY)
iterator->synthesize_nobody = false;
iterator->found_group = TAKE_PTR(g);
iterator->n_found++;
if (FLAGS_SET(flags, SD_VARLINK_REPLY_CONTINUES))
return 0;
r = 0;
goto finish;
}
case LOOKUP_MEMBERSHIP: {
_cleanup_(membership_data_done) struct membership_data membership_data = {};
static const sd_json_dispatch_field dispatch_table[] = {
{ "userName", SD_JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, user_name), SD_JSON_RELAX },
{ "groupName", SD_JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, group_name), SD_JSON_RELAX },
{}
};
assert(!iterator->found_user_name);
assert(!iterator->found_group_name);
r = sd_json_dispatch(parameters, dispatch_table, SD_JSON_ALLOW_EXTENSIONS, &membership_data);
if (r < 0)
goto finish;
iterator->found_user_name = TAKE_PTR(membership_data.user_name);
iterator->found_group_name = TAKE_PTR(membership_data.group_name);
iterator->n_found++;
if (FLAGS_SET(flags, SD_VARLINK_REPLY_CONTINUES))
return 0;
r = 0;
goto finish;
}
default:
assert_not_reached();
}
finish:
/* If we got one ENOEXEC, let that win. Similarly, ESRCH wins except for ENOEXEC. This way when we do
* a wild dump we won't be tripped up by bad errors – as long as at least one connection ended
* somewhat cleanly. */
if (r == -ENOEXEC ||
(r == -ESRCH && iterator->error != ENOEXEC) ||
iterator->error == 0)
iterator->error = -r;
assert_se(set_remove(iterator->links, link) == link);
link = sd_varlink_unref(link);
return 0;
}
static int userdb_connect(
UserDBIterator *iterator,
const char *path,
const char *method,
bool more,
sd_json_variant *query) {
_cleanup_(sd_varlink_unrefp) sd_varlink *vl = NULL;
int r;
assert(iterator);
assert(path);
assert(method);
r = sd_varlink_connect_address(&vl, path);
if (r < 0)
return log_debug_errno(r, "Unable to connect to %s: %m", path);
sd_varlink_set_userdata(vl, iterator);
if (!iterator->event) {
r = sd_event_new(&iterator->event);
if (r < 0)
return log_debug_errno(r, "Unable to allocate event loop: %m");
}
r = sd_varlink_attach_event(vl, iterator->event, SD_EVENT_PRIORITY_NORMAL);
if (r < 0)
return log_debug_errno(r, "Failed to attach varlink connection to event loop: %m");
/* Note, this is load bearing: we store the socket path as description for the varlink
* connection. That's not just good for debugging, but we reuse this information in case we need to
* reissue the query with a reduced set of parameters. */
r = sd_varlink_set_description(vl, path);
if (r < 0)
return log_debug_errno(r, "Failed to set varlink connection description: %m");
r = sd_varlink_bind_reply(vl, userdb_on_query_reply);
if (r < 0)
return log_debug_errno(r, "Failed to bind reply callback: %m");
_cleanup_free_ char *service = NULL;
r = path_extract_filename(path, &service);
if (r < 0)
return log_debug_errno(r, "Failed to extract service name from socket path: %m");
assert(r != O_DIRECTORY);
_cleanup_(sd_json_variant_unrefp) sd_json_variant *patched_query = sd_json_variant_ref(query);
r = sd_json_variant_set_field_string(&patched_query, "service", service);
if (r < 0)
return log_debug_errno(r, "Unable to set service JSON field: %m");
if (more)
r = sd_varlink_observe(vl, method, patched_query);
else
r = sd_varlink_invoke(vl, method, patched_query);
if (r < 0)
return log_debug_errno(r, "Failed to invoke varlink method: %m");
r = set_ensure_consume(&iterator->links, &link_hash_ops, TAKE_PTR(vl));
if (r < 0)
return log_debug_errno(r, "Failed to add varlink connection to set: %m");
return r;
}
static int userdb_start_query(
UserDBIterator *iterator,
const char *method, /* must be a static string, we are not going to copy this here! */
bool more,
sd_json_variant *query,
UserDBFlags flags) {
_cleanup_strv_free_ char **except = NULL, **only = NULL;
_cleanup_closedir_ DIR *d = NULL;
const char *e;
int r, ret = 0;
assert(iterator);
assert(method);
if (FLAGS_SET(flags, USERDB_EXCLUDE_VARLINK))
return -ENOLINK;
assert(!iterator->query);
iterator->method = method; /* note: we don't make a copy here! */
iterator->query = sd_json_variant_ref(query);
iterator->more = more;
e = getenv("SYSTEMD_BYPASS_USERDB");
if (e) {
r = parse_boolean(e);
if (r > 0)
return -ENOLINK;
if (r < 0) {
except = strv_split(e, ":");
if (!except)
return -ENOMEM;
}
}
e = getenv("SYSTEMD_ONLY_USERDB");
if (e) {
only = strv_split(e, ":");
if (!only)
return -ENOMEM;
}
/* First, let's talk to the multiplexer, if we can */
if ((flags & (USERDB_AVOID_MULTIPLEXER|USERDB_EXCLUDE_DYNAMIC_USER|USERDB_EXCLUDE_NSS|USERDB_EXCLUDE_DROPIN|USERDB_DONT_SYNTHESIZE_INTRINSIC|USERDB_DONT_SYNTHESIZE_FOREIGN)) == 0 &&
!strv_contains(except, "io.systemd.Multiplexer") &&
(!only || strv_contains(only, "io.systemd.Multiplexer"))) {
r = userdb_connect(iterator, "/run/systemd/userdb/io.systemd.Multiplexer", method, more, query);
if (r >= 0) {
iterator->nss_covered = true; /* The multiplexer does NSS */
iterator->dropin_covered = true; /* It also handles drop-in stuff */
return 0;
}
}
d = opendir("/run/systemd/userdb/");
if (!d) {
if (errno == ENOENT)
return -ESRCH;
return -errno;
}
FOREACH_DIRENT(de, d, return -errno) {
_cleanup_free_ char *p = NULL;
bool is_nss, is_dropin;
if (streq(de->d_name, "io.systemd.Multiplexer")) /* We already tried this above, don't try this again */
continue;
if (FLAGS_SET(flags, USERDB_EXCLUDE_DYNAMIC_USER) &&
streq(de->d_name, "io.systemd.DynamicUser"))
continue;
/* Avoid NSS if this is requested. Note that we also skip NSS when we were asked to skip the
* multiplexer, since in that case it's safer to do NSS in the client side emulation below
* (and when we run as part of systemd-userdbd.service we don't want to talk to ourselves
* anyway). */
is_nss = streq(de->d_name, "io.systemd.NameServiceSwitch");
if ((flags & (USERDB_EXCLUDE_NSS|USERDB_AVOID_MULTIPLEXER)) && is_nss)
continue;
/* Similar for the drop-in service */
is_dropin = streq(de->d_name, "io.systemd.DropIn");
if ((flags & (USERDB_EXCLUDE_DROPIN|USERDB_AVOID_MULTIPLEXER)) && is_dropin)
continue;
if (strv_contains(except, de->d_name))
continue;
if (only && !strv_contains(only, de->d_name))
continue;
p = path_join("/run/systemd/userdb/", de->d_name);
if (!p)
return -ENOMEM;
r = userdb_connect(iterator, p, method, more, query);
if (is_nss && r >= 0) /* Turn off fallback NSS + dropin if we found the NSS/dropin service
* and could connect to it */
iterator->nss_covered = true;
if (is_dropin && r >= 0)
iterator->dropin_covered = true;
RET_GATHER(ret, r);
}
if (set_isempty(iterator->links))
return ret < 0 ? ret : -ESRCH; /* propagate the first error we saw if we couldn't connect to anything. */
/* We connected to some services, in this case, ignore the ones we failed on */
return 0;
}
static int userdb_process(
UserDBIterator *iterator,
UserRecord **ret_user_record,
GroupRecord **ret_group_record,
char **ret_user_name,
char **ret_group_name) {
int r;
assert(iterator);
for (;;) {
if (iterator->what == LOOKUP_USER && iterator->found_user) {
if (ret_user_record)
*ret_user_record = TAKE_PTR(iterator->found_user);
else
iterator->found_user = user_record_unref(iterator->found_user);
if (ret_group_record)
*ret_group_record = NULL;
if (ret_user_name)
*ret_user_name = NULL;
if (ret_group_name)
*ret_group_name = NULL;
return 0;
}
if (iterator->what == LOOKUP_GROUP && iterator->found_group) {
if (ret_group_record)
*ret_group_record = TAKE_PTR(iterator->found_group);
else
iterator->found_group = group_record_unref(iterator->found_group);
if (ret_user_record)
*ret_user_record = NULL;
if (ret_user_name)
*ret_user_name = NULL;
if (ret_group_name)
*ret_group_name = NULL;
return 0;
}
if (iterator->what == LOOKUP_MEMBERSHIP && iterator->found_user_name && iterator->found_group_name) {
if (ret_user_name)
*ret_user_name = TAKE_PTR(iterator->found_user_name);
else
iterator->found_user_name = mfree(iterator->found_user_name);
if (ret_group_name)
*ret_group_name = TAKE_PTR(iterator->found_group_name);
else
iterator->found_group_name = mfree(iterator->found_group_name);
if (ret_user_record)
*ret_user_record = NULL;
if (ret_group_record)
*ret_group_record = NULL;
return 0;
}
if (set_isempty(iterator->links)) {
if (iterator->error == 0)
return -ESRCH;
return -abs(iterator->error);
}
if (!iterator->event)
return -ESRCH;
r = sd_event_run(iterator->event, UINT64_MAX);
if (r < 0)
return r;
}
}
static int synthetic_root_user_build(UserRecord **ret) {
return user_record_buildo(
ret,
SD_JSON_BUILD_PAIR("userName", JSON_BUILD_CONST_STRING("root")),
SD_JSON_BUILD_PAIR("uid", SD_JSON_BUILD_UNSIGNED(0)),
SD_JSON_BUILD_PAIR("gid", SD_JSON_BUILD_UNSIGNED(0)),
SD_JSON_BUILD_PAIR("homeDirectory", JSON_BUILD_CONST_STRING("/root")),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")));
}
static int synthetic_nobody_user_build(UserRecord **ret) {
return user_record_buildo(
ret,
SD_JSON_BUILD_PAIR("userName", JSON_BUILD_CONST_STRING(NOBODY_USER_NAME)),
SD_JSON_BUILD_PAIR("uid", SD_JSON_BUILD_UNSIGNED(UID_NOBODY)),
SD_JSON_BUILD_PAIR("gid", SD_JSON_BUILD_UNSIGNED(GID_NOBODY)),
SD_JSON_BUILD_PAIR("shell", JSON_BUILD_CONST_STRING(NOLOGIN)),
SD_JSON_BUILD_PAIR("locked", SD_JSON_BUILD_BOOLEAN(true)),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")));
}
static int synthetic_foreign_user_build(uid_t foreign_uid, UserRecord **ret) {
assert(ret);
if (!uid_is_valid(foreign_uid))
return -ESRCH;
if (foreign_uid > 0xFFFF)
return -ESRCH;
_cleanup_free_ char *un = NULL;
if (asprintf(&un, "foreign-" UID_FMT, foreign_uid) < 0)
return -ENOMEM;
_cleanup_free_ char *rn = NULL;
if (asprintf(&rn, "Foreign System Image UID " UID_FMT, foreign_uid) < 0)
return -ENOMEM;
return user_record_buildo(
ret,
SD_JSON_BUILD_PAIR_STRING("userName", un),
SD_JSON_BUILD_PAIR_STRING("realName", rn),
SD_JSON_BUILD_PAIR_UNSIGNED("uid", FOREIGN_UID_BASE + foreign_uid),
SD_JSON_BUILD_PAIR_UNSIGNED("gid", FOREIGN_UID_BASE + foreign_uid),
SD_JSON_BUILD_PAIR("shell", JSON_BUILD_CONST_STRING(NOLOGIN)),
SD_JSON_BUILD_PAIR_BOOLEAN("locked", true),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("foreign")));
}
static int synthetic_numeric_user_build(uid_t uid, UserRecord **ret) {
assert(ret);
if (uid == 0) /* This should be handled by synthetic_root_user_build() */
return -ESRCH;
if (!uid_is_system(uid))
return -ESRCH;
_cleanup_free_ char *un = NULL;
if (asprintf(&un, "unknown-" UID_FMT, uid) < 0)
return -ENOMEM;
_cleanup_free_ char *rn = NULL;
if (asprintf(&rn, "Unknown System UID " UID_FMT, uid) < 0)
return -ENOMEM;
return user_record_buildo(
ret,
SD_JSON_BUILD_PAIR_STRING("userName", un),
SD_JSON_BUILD_PAIR_STRING("realName", rn),
SD_JSON_BUILD_PAIR_UNSIGNED("uid", uid),
SD_JSON_BUILD_PAIR_STRING("disposition", "system"));
}
static int user_name_foreign_extract_uid(const char *name, uid_t *ret_uid) {
int r;
assert(name);
assert(ret_uid);
/* Parses the inner UID from a user name of the foreign UID range, in the form "foreign-NNN". Returns
* > 0 if that worked, 0 if it didn't. */
const char *e = startswith(name, "foreign-");
if (!e)
goto nomatch;
uid_t uid;
r = parse_uid(e, &uid);
if (r < 0)
goto nomatch;
if (uid > 0xFFFF)
goto nomatch;
*ret_uid = uid;
return 1;
nomatch:
*ret_uid = UID_INVALID;
return 0;
}
static int query_append_common(sd_json_variant **query, const UserDBMatch *match) {
int r;
_cleanup_strv_free_ char **dispositions = NULL;
assert(query);
uint64_t mask = match->disposition_mask;
if (FLAGS_SET(mask, USER_DISPOSITION_MASK_ALL)) {
for (UserDisposition d = 0; d < _USER_DISPOSITION_MAX; d++) {
if (!BIT_SET(mask, d))
continue;
r = strv_extend(&dispositions, user_disposition_to_string(d));
if (r < 0)
return r;
}
}
return sd_json_variant_merge_objectbo(
query,
SD_JSON_BUILD_PAIR_CONDITION(!strv_isempty(match->fuzzy_names), "fuzzyNames", SD_JSON_BUILD_STRV(match->fuzzy_names)),
SD_JSON_BUILD_PAIR_CONDITION(!sd_id128_is_null(match->uuid), "uuid", SD_JSON_BUILD_UUID(match->uuid)),
SD_JSON_BUILD_PAIR_CONDITION(!strv_isempty(dispositions), "dispositionMask", SD_JSON_BUILD_STRV(dispositions)));
}
static int query_append_uid_match(sd_json_variant **query, const UserDBMatch *match) {
int r;
assert(query);
if (!userdb_match_is_set(match))
return 0;
r = sd_json_variant_merge_objectbo(
query,
SD_JSON_BUILD_PAIR_CONDITION(match->uid_min > 0, "uidMin", SD_JSON_BUILD_UNSIGNED(match->uid_min)),
SD_JSON_BUILD_PAIR_CONDITION(match->uid_max < UID_INVALID-1, "uidMax", SD_JSON_BUILD_UNSIGNED(match->uid_max)));
if (r < 0)
return r;
return query_append_common(query, match);
}
static int userdb_by_name_fallbacks(
const char *name,
UserDBIterator *iterator,
UserDBFlags flags,
UserRecord **ret) {
int r;
assert(name);
assert(iterator);
assert(ret);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !iterator->dropin_covered) {
r = dropin_user_record_by_name(name, /* path= */ NULL, flags, ret);
if (r >= 0)
return r;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !iterator->nss_covered) {
/* Make sure the NSS lookup doesn't recurse back to us. */
r = userdb_iterator_block_nss_systemd(iterator);
if (r >= 0) {
/* Client-side NSS fallback */
r = nss_user_record_by_name(name, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret);
if (r >= 0)
return r;
}
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC)) {
if (streq(name, "root"))
return synthetic_root_user_build(ret);
if (streq(name, NOBODY_USER_NAME) && synthesize_nobody())
return synthetic_nobody_user_build(ret);
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_FOREIGN)) {
uid_t foreign_uid;
r = user_name_foreign_extract_uid(name, &foreign_uid);
if (r < 0)
return r;
if (r > 0)
return synthetic_foreign_user_build(foreign_uid, ret);
}
return -ESRCH;
}
int userdb_by_name(const char *name, const UserDBMatch *match, UserDBFlags flags, UserRecord **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r;
/* Well known errors this returns:
* -EINVAL → user name is not valid
* -ESRCH → no such user
* -ENOEXEC → found a user by request UID or name, but it does not match filter
* -EHOSTDOWN → service failed for some reason
* -ETIMEDOUT → service timed out
*/
assert(name);
if (FLAGS_SET(flags, USERDB_PARSE_NUMERIC)) {
uid_t uid;
if (parse_uid(name, &uid) >= 0)
return userdb_by_uid(uid, match, flags, ret);
}
if (!valid_user_group_name(name, VALID_USER_RELAX))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_STRING("userName", name));
if (r < 0)
return r;
r = query_append_uid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_USER, flags);
if (!iterator)
return -ENOMEM;
_cleanup_(user_record_unrefp) UserRecord *ur = NULL;
r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", /* more= */ false, query, flags);
if (r >= 0) {
r = userdb_process(iterator, &ur, /* ret_group_record= */ NULL, /* ret_user_name= */ NULL, /* ret_group_name= */ NULL);
if (r == -ENOEXEC) /* Found a user matching UID or name, but not filter. In this case the
* fallback paths below are pointless */
return r;
}
if (r < 0) { /* If the above fails for any other reason, try fallback paths */
r = userdb_by_name_fallbacks(name, iterator, flags, &ur);
if (r < 0)
return r;
}
/* NB: we always apply our own filtering here, explicitly, regardless if the server supported it or
* not. It's more robust this way, we never know how carefully the server is written, and whether it
* properly implements all details of the filtering logic. */
if (!user_record_match(ur, match))
return -ENOEXEC;
if (ret)
*ret = TAKE_PTR(ur);
return 0;
}
static int userdb_by_uid_fallbacks(
uid_t uid,
UserDBIterator *iterator,
UserDBFlags flags,
UserRecord **ret) {
int r;
assert(uid_is_valid(uid));
assert(iterator);
assert(ret);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !iterator->dropin_covered) {
r = dropin_user_record_by_uid(uid, NULL, flags, ret);
if (r >= 0)
return r;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !iterator->nss_covered) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r >= 0) {
/* Client-side NSS fallback */
r = nss_user_record_by_uid(uid, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret);
if (r >= 0)
return r;
}
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC)) {
if (uid == 0)
return synthetic_root_user_build(ret);
if (uid == UID_NOBODY && synthesize_nobody())
return synthetic_nobody_user_build(ret);
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_FOREIGN) && uid_is_foreign(uid))
return synthetic_foreign_user_build(uid - FOREIGN_UID_BASE, ret);
if (FLAGS_SET(flags, USERDB_SYNTHESIZE_NUMERIC))
return synthetic_numeric_user_build(uid, ret);
return -ESRCH;
}
int userdb_by_uid(uid_t uid, const UserDBMatch *match, UserDBFlags flags, UserRecord **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r;
if (!uid_is_valid(uid))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_UNSIGNED("uid", uid));
if (r < 0)
return r;
r = query_append_uid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_USER, flags);
if (!iterator)
return -ENOMEM;
_cleanup_(user_record_unrefp) UserRecord *ur = NULL;
r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", /* more= */ false, query, flags);
if (r >= 0) {
r = userdb_process(iterator, &ur, /* ret_group_record= */ NULL, /* ret_user_name= */ NULL, /* ret_group_name= */ NULL);
if (r == -ENOEXEC)
return r;
}
if (r < 0) {
r = userdb_by_uid_fallbacks(uid, iterator, flags, &ur);
if (r < 0)
return r;
}
if (!user_record_match(ur, match))
return -ENOEXEC;
if (ret)
*ret = TAKE_PTR(ur);
return 0;
}
int userdb_all(const UserDBMatch *match, UserDBFlags flags, UserDBIterator **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r, qr;
assert(ret);
r = query_append_uid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_USER, flags);
if (!iterator)
return -ENOMEM;
qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", /* more= */ true, query, flags);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r < 0)
return r;
setpwent();
iterator->nss_iterating = true;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) {
r = conf_files_list_nulstr(
&iterator->dropins,
".user",
NULL,
CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED,
USERDB_DROPIN_DIR_NULSTR("userdb"));
if (r < 0)
log_debug_errno(r, "Failed to find user drop-ins, ignoring: %m");
}
/* Note that we do not enumerate the foreign users, since those would be just 64K of noise */
/* propagate IPC error, but only if there are no drop-ins */
if (qr < 0 &&
!iterator->nss_iterating &&
strv_isempty(iterator->dropins))
return qr;
*ret = TAKE_PTR(iterator);
return 0;
}
static int userdb_iterator_get_one(UserDBIterator *iterator, UserRecord **ret) {
int r;
assert(iterator);
assert(iterator->what == LOOKUP_USER);
if (iterator->nss_iterating) {
struct passwd *pw;
/* If NSS isn't covered elsewhere, let's iterate through it first, since it probably contains
* the more traditional sources, which are probably good to show first. */
errno = 0;
pw = getpwent();
if (pw) {
_cleanup_free_ char *buffer = NULL;
bool incomplete = false;
struct spwd spwd;
if (streq_ptr(pw->pw_name, "root"))
iterator->synthesize_root = false;
if (pw->pw_uid == UID_NOBODY)
iterator->synthesize_nobody = false;
if (!FLAGS_SET(iterator->flags, USERDB_SUPPRESS_SHADOW)) {
r = nss_spwd_for_passwd(pw, &spwd, &buffer);
if (r < 0) {
log_debug_errno(r, "Failed to acquire shadow entry for user %s, ignoring: %m", pw->pw_name);
incomplete = ERRNO_IS_PRIVILEGE(r);
}
} else {
r = -EUCLEAN;
incomplete = true;
}
r = nss_passwd_to_user_record(pw, r >= 0 ? &spwd : NULL, ret);
if (r < 0)
return r;
if (ret)
(*ret)->incomplete = incomplete;
iterator->n_found++;
return r;
}
if (errno != 0)
log_debug_errno(errno, "Failure to iterate NSS user database, ignoring: %m");
iterator->nss_iterating = false;
endpwent();
}
for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) {
const char *i = iterator->dropins[iterator->current_dropin];
_cleanup_free_ char *fn = NULL;
uid_t uid;
char *e;
/* Next, let's add in the static drop-ins, which are quick to retrieve */
r = path_extract_filename(i, &fn);
if (r < 0)
return r;
e = endswith(fn, ".user"); /* not actually a .user file? Then skip to next */
if (!e)
continue;
*e = 0; /* Chop off suffix */
if (parse_uid(fn, &uid) < 0) /* not a UID .user file? Then skip to next */
continue;
r = dropin_user_record_by_uid(uid, i, iterator->flags, ret);
if (r < 0) {
log_debug_errno(r, "Failed to parse user record for UID " UID_FMT ", ignoring: %m", uid);
continue; /* If we failed to parse this record, let's suppress it from enumeration,
* and continue with the next record. Maybe someone is dropping it files
* and only partially wrote this one. */
}
iterator->current_dropin++; /* make sure on the next call of userdb_iterator_get() we continue with the next dropin */
iterator->n_found++;
return 0;
}
/* Then, let's return the users provided by varlink IPC */
r = userdb_process(iterator, ret, /* ret_group_record= */ NULL, /* ret_user_name= */ NULL, /* ret_group_name= */ NULL);
if (r < 0) {
/* Finally, synthesize root + nobody if not done yet */
if (iterator->synthesize_root) {
iterator->synthesize_root = false;
iterator->n_found++;
return synthetic_root_user_build(ret);
}
if (iterator->synthesize_nobody) {
iterator->synthesize_nobody = false;
iterator->n_found++;
return synthetic_nobody_user_build(ret);
}
/* if we found at least one entry, then ignore errors and indicate that we reached the end */
if (iterator->n_found > 0)
return -ESRCH;
}
return r;
}
int userdb_iterator_get(UserDBIterator *iterator, const UserDBMatch *match, UserRecord **ret) {
int r;
assert(iterator);
assert(iterator->what == LOOKUP_USER);
for (;;) {
_cleanup_(user_record_unrefp) UserRecord *ur = NULL;
r = userdb_iterator_get_one(iterator, userdb_match_is_set(match) || ret ? &ur : NULL);
if (r < 0)
return r;
if (ur && !user_record_match(ur, match))
continue;
if (ret)
*ret = TAKE_PTR(ur);
return r;
}
}
static int synthetic_root_group_build(GroupRecord **ret) {
return group_record_buildo(
ret,
SD_JSON_BUILD_PAIR("groupName", JSON_BUILD_CONST_STRING("root")),
SD_JSON_BUILD_PAIR("gid", SD_JSON_BUILD_UNSIGNED(0)),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")));
}
static int synthetic_nobody_group_build(GroupRecord **ret) {
return group_record_buildo(
ret,
SD_JSON_BUILD_PAIR("groupName", JSON_BUILD_CONST_STRING(NOBODY_GROUP_NAME)),
SD_JSON_BUILD_PAIR("gid", SD_JSON_BUILD_UNSIGNED(GID_NOBODY)),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")));
}
static int synthetic_foreign_group_build(gid_t foreign_gid, GroupRecord **ret) {
assert(ret);
if (!gid_is_valid(foreign_gid))
return -ESRCH;
if (foreign_gid > 0xFFFF)
return -ESRCH;
_cleanup_free_ char *gn = NULL;
if (asprintf(&gn, "foreign-" GID_FMT, foreign_gid) < 0)
return -ENOMEM;
_cleanup_free_ char *d = NULL;
if (asprintf(&d, "Foreign System Image GID " GID_FMT, foreign_gid) < 0)
return -ENOMEM;
return group_record_buildo(
ret,
SD_JSON_BUILD_PAIR_STRING("groupName", gn),
SD_JSON_BUILD_PAIR_STRING("description", d),
SD_JSON_BUILD_PAIR_UNSIGNED("gid", FOREIGN_UID_BASE + foreign_gid),
SD_JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("foreign")));
}
static int synthetic_numeric_group_build(gid_t gid, GroupRecord **ret) {
assert(ret);
if (gid == 0) /* This should be handled by synthetic_root_group_build() */
return -ESRCH;
if (!gid_is_system(gid))
return -ESRCH;
_cleanup_free_ char *gn = NULL;
if (asprintf(&gn, "unknown-" GID_FMT, gid) < 0)
return -ENOMEM;
_cleanup_free_ char *d = NULL;
if (asprintf(&d, "Unknown System GID " UID_FMT, gid) < 0)
return -ENOMEM;
return group_record_buildo(
ret,
SD_JSON_BUILD_PAIR_STRING("groupName", gn),
SD_JSON_BUILD_PAIR_STRING("description", d),
SD_JSON_BUILD_PAIR_UNSIGNED("gid", gid),
SD_JSON_BUILD_PAIR_STRING("disposition", "system"));
}
static int query_append_gid_match(sd_json_variant **query, const UserDBMatch *match) {
int r;
assert(query);
if (!userdb_match_is_set(match))
return 0;
r = sd_json_variant_merge_objectbo(
query,
SD_JSON_BUILD_PAIR_CONDITION(match->gid_min > 0, "gidMin", SD_JSON_BUILD_UNSIGNED(match->gid_min)),
SD_JSON_BUILD_PAIR_CONDITION(match->gid_max < GID_INVALID-1, "gidMax", SD_JSON_BUILD_UNSIGNED(match->gid_max)));
if (r < 0)
return r;
return query_append_common(query, match);
}
static int groupdb_by_name_fallbacks(
const char *name,
UserDBIterator *iterator,
UserDBFlags flags,
GroupRecord **ret) {
int r;
assert(name);
assert(iterator);
assert(ret);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !iterator->dropin_covered) {
r = dropin_group_record_by_name(name, NULL, flags, ret);
if (r >= 0)
return r;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !iterator->nss_covered) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r >= 0) {
r = nss_group_record_by_name(name, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret);
if (r >= 0)
return r;
}
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC)) {
if (streq(name, "root"))
return synthetic_root_group_build(ret);
if (streq(name, NOBODY_GROUP_NAME) && synthesize_nobody())
return synthetic_nobody_group_build(ret);
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_FOREIGN)) {
uid_t foreign_gid;
r = user_name_foreign_extract_uid(name, &foreign_gid); /* Same for UID + GID */
if (r < 0)
return r;
if (r > 0)
return synthetic_foreign_group_build(foreign_gid, ret);
}
return -ESRCH;
}
int groupdb_by_name(const char *name, const UserDBMatch *match, UserDBFlags flags, GroupRecord **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r;
assert(name);
if (FLAGS_SET(flags, USERDB_PARSE_NUMERIC)) {
gid_t gid;
if (parse_gid(name, &gid) >= 0)
return groupdb_by_gid(gid, match, flags, ret);
}
if (!valid_user_group_name(name, VALID_USER_RELAX))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_STRING("groupName", name));
if (r < 0)
return r;
r = query_append_gid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_GROUP, flags);
if (!iterator)
return -ENOMEM;
_cleanup_(group_record_unrefp) GroupRecord *gr = NULL;
r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", /* more= */ false, query, flags);
if (r >= 0) {
r = userdb_process(iterator, /* ret_user_record= */ NULL, &gr, /* ret_user_name= */ NULL, /* ret_group_name= */ NULL);
if (r == -ENOEXEC)
return r;
}
if (r < 0) {
r = groupdb_by_name_fallbacks(name, iterator, flags, &gr);
if (r < 0)
return r;
}
/* As above, we apply our own client-side filtering even if server-side filtering worked, for robustness and simplicity reasons. */
if (!group_record_match(gr, match))
return -ENOEXEC;
if (ret)
*ret = TAKE_PTR(gr);
return 0;
}
static int groupdb_by_gid_fallbacks(
gid_t gid,
UserDBIterator *iterator,
UserDBFlags flags,
GroupRecord **ret) {
int r;
assert(gid_is_valid(gid));
assert(iterator);
assert(ret);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !(iterator && iterator->dropin_covered)) {
r = dropin_group_record_by_gid(gid, NULL, flags, ret);
if (r >= 0)
return r;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !(iterator && iterator->nss_covered)) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r >= 0) {
r = nss_group_record_by_gid(gid, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret);
if (r >= 0)
return r;
}
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_INTRINSIC)) {
if (gid == 0)
return synthetic_root_group_build(ret);
if (gid == GID_NOBODY && synthesize_nobody())
return synthetic_nobody_group_build(ret);
}
if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE_FOREIGN) && gid_is_foreign(gid))
return synthetic_foreign_group_build(gid - FOREIGN_UID_BASE, ret);
if (FLAGS_SET(flags, USERDB_SYNTHESIZE_NUMERIC))
return synthetic_numeric_group_build(gid, ret);
return -ESRCH;
}
int groupdb_by_gid(gid_t gid, const UserDBMatch *match, UserDBFlags flags, GroupRecord **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r;
if (!gid_is_valid(gid))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_UNSIGNED("gid", gid));
if (r < 0)
return r;
r = query_append_gid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_GROUP, flags);
if (!iterator)
return -ENOMEM;
_cleanup_(group_record_unrefp) GroupRecord *gr = NULL;
r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", /* more= */ false, query, flags);
if (r >= 0) {
r = userdb_process(iterator, /* ret_user_record= */ NULL, &gr, /* ret_user_name= */ NULL, /* ret_group_name= */ NULL);
if (r == -ENOEXEC)
return r;
}
if (r < 0) {
r = groupdb_by_gid_fallbacks(gid, iterator, flags, &gr);
if (r < 0)
return r;
}
if (!group_record_match(gr, match))
return -ENOEXEC;
if (ret)
*ret = TAKE_PTR(gr);
return 0;
}
int groupdb_all(const UserDBMatch *match, UserDBFlags flags, UserDBIterator **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r, qr;
assert(ret);
r = query_append_gid_match(&query, match);
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_GROUP, flags);
if (!iterator)
return -ENOMEM;
qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", /* more= */ true, query, flags);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r < 0)
return r;
setgrent();
iterator->nss_iterating = true;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) {
r = conf_files_list_nulstr(
&iterator->dropins,
".group",
NULL,
CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED,
USERDB_DROPIN_DIR_NULSTR("userdb"));
if (r < 0)
log_debug_errno(r, "Failed to find group drop-ins, ignoring: %m");
}
if (qr < 0 &&
!iterator->nss_iterating &&
strv_isempty(iterator->dropins))
return qr;
*ret = TAKE_PTR(iterator);
return 0;
}
static int groupdb_iterator_get_one(UserDBIterator *iterator, GroupRecord **ret) {
int r;
assert(iterator);
assert(iterator->what == LOOKUP_GROUP);
if (iterator->nss_iterating) {
struct group *gr;
errno = 0;
gr = getgrent();
if (gr) {
_cleanup_free_ char *buffer = NULL;
bool incomplete = false;
struct sgrp sgrp;
if (streq_ptr(gr->gr_name, "root"))
iterator->synthesize_root = false;
if (gr->gr_gid == GID_NOBODY)
iterator->synthesize_nobody = false;
if (!FLAGS_SET(iterator->flags, USERDB_SUPPRESS_SHADOW)) {
r = nss_sgrp_for_group(gr, &sgrp, &buffer);
if (r < 0) {
log_debug_errno(r, "Failed to acquire shadow entry for group %s, ignoring: %m", gr->gr_name);
incomplete = ERRNO_IS_PRIVILEGE(r);
}
} else {
r = -EUCLEAN;
incomplete = true;
}
r = nss_group_to_group_record(gr, r >= 0 ? &sgrp : NULL, ret);
if (r < 0)
return r;
if (ret)
(*ret)->incomplete = incomplete;
iterator->n_found++;
return r;
}
if (errno != 0)
log_debug_errno(errno, "Failure to iterate NSS group database, ignoring: %m");
iterator->nss_iterating = false;
endgrent();
}
for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) {
const char *i = iterator->dropins[iterator->current_dropin];
_cleanup_free_ char *fn = NULL;
gid_t gid;
char *e;
r = path_extract_filename(i, &fn);
if (r < 0)
return r;
e = endswith(fn, ".group");
if (!e)
continue;
*e = 0; /* Chop off suffix */
if (parse_gid(fn, &gid) < 0)
continue;
r = dropin_group_record_by_gid(gid, i, iterator->flags, ret);
if (r < 0) {
log_debug_errno(r, "Failed to parse group record for GID " GID_FMT ", ignoring: %m", gid);
continue;
}
iterator->current_dropin++;
iterator->n_found++;
return 0;
}
r = userdb_process(iterator, NULL, ret, NULL, NULL);
if (r < 0) {
if (iterator->synthesize_root) {
iterator->synthesize_root = false;
iterator->n_found++;
return synthetic_root_group_build(ret);
}
if (iterator->synthesize_nobody) {
iterator->synthesize_nobody = false;
iterator->n_found++;
return synthetic_nobody_group_build(ret);
}
/* if we found at least one entry, then ignore errors and indicate that we reached the end */
if (iterator->n_found > 0)
return -ESRCH;
}
return r;
}
int groupdb_iterator_get(UserDBIterator *iterator, const UserDBMatch *match, GroupRecord **ret) {
int r;
assert(iterator);
assert(iterator->what == LOOKUP_GROUP);
for (;;) {
_cleanup_(group_record_unrefp) GroupRecord *gr = NULL;
r = groupdb_iterator_get_one(iterator, userdb_match_is_set(match) || ret ? &gr : NULL);
if (r < 0)
return r;
if (gr && !group_record_match(gr, match))
continue;
if (ret)
*ret = TAKE_PTR(gr);
return r;
}
}
static void discover_membership_dropins(UserDBIterator *i, UserDBFlags flags) {
int r;
r = conf_files_list_nulstr(
&i->dropins,
".membership",
NULL,
CONF_FILES_REGULAR|CONF_FILES_BASENAME|CONF_FILES_FILTER_MASKED_BY_SYMLINK,
USERDB_DROPIN_DIR_NULSTR("userdb"));
if (r < 0)
log_debug_errno(r, "Failed to find membership drop-ins, ignoring: %m");
}
int membershipdb_by_user(const char *name, UserDBFlags flags, UserDBIterator **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r, qr;
assert(ret);
if (!valid_user_group_name(name, VALID_USER_RELAX))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_STRING("userName", name));
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags);
if (!iterator)
return -ENOMEM;
iterator->filter_user_name = strdup(name);
if (!iterator->filter_user_name)
return -ENOMEM;
qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, query, flags);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r < 0)
return r;
setgrent();
iterator->nss_iterating = true;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered))
discover_membership_dropins(iterator, flags);
if (qr < 0 &&
!iterator->nss_iterating &&
strv_isempty(iterator->dropins))
return qr;
*ret = TAKE_PTR(iterator);
return 0;
}
int membershipdb_by_group(const char *name, UserDBFlags flags, UserDBIterator **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_(sd_json_variant_unrefp) sd_json_variant *query = NULL;
int r, qr;
assert(ret);
if (!valid_user_group_name(name, VALID_USER_RELAX))
return -EINVAL;
r = sd_json_buildo(&query, SD_JSON_BUILD_PAIR_STRING("groupName", name));
if (r < 0)
return r;
iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags);
if (!iterator)
return -ENOMEM;
iterator->filter_group_name = strdup(name);
if (!iterator->filter_group_name)
return -ENOMEM;
qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, query, flags);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) {
_cleanup_(group_record_unrefp) GroupRecord *gr = NULL;
r = userdb_iterator_block_nss_systemd(iterator);
if (r < 0)
return r;
/* We ignore all errors here, since the group might be defined by a userdb native service, and we queried them already above. */
(void) nss_group_record_by_name(name, false, &gr);
if (gr) {
iterator->members_of_group = strv_copy(gr->members);
if (!iterator->members_of_group)
return -ENOMEM;
iterator->index_members_of_group = 0;
iterator->found_group_name = strdup(name);
if (!iterator->found_group_name)
return -ENOMEM;
}
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered))
discover_membership_dropins(iterator, flags);
if (qr < 0 &&
strv_isempty(iterator->members_of_group) &&
strv_isempty(iterator->dropins))
return qr;
*ret = TAKE_PTR(iterator);
return 0;
}
int membershipdb_all(UserDBFlags flags, UserDBIterator **ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
int r, qr;
assert(ret);
iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags);
if (!iterator)
return -ENOMEM;
qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, NULL, flags);
if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) {
r = userdb_iterator_block_nss_systemd(iterator);
if (r < 0)
return r;
setgrent();
iterator->nss_iterating = true;
}
if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered))
discover_membership_dropins(iterator, flags);
if (qr < 0 &&
!iterator->nss_iterating &&
strv_isempty(iterator->dropins))
return qr;
*ret = TAKE_PTR(iterator);
return 0;
}
int membershipdb_iterator_get(
UserDBIterator *iterator,
char **ret_user,
char **ret_group) {
int r;
assert(iterator);
for (;;) {
/* If we are iterating through NSS acquire a new group entry if we haven't acquired one yet. */
if (!iterator->members_of_group) {
struct group *g;
if (!iterator->nss_iterating)
break;
assert(!iterator->found_user_name);
do {
errno = 0;
g = getgrent();
if (!g) {
if (errno != 0)
log_debug_errno(errno, "Failure during NSS group iteration, ignoring: %m");
break;
}
} while (iterator->filter_user_name ? !strv_contains(g->gr_mem, iterator->filter_user_name) :
strv_isempty(g->gr_mem));
if (g) {
r = free_and_strdup(&iterator->found_group_name, g->gr_name);
if (r < 0)
return r;
if (iterator->filter_user_name)
iterator->members_of_group = strv_new(iterator->filter_user_name);
else
iterator->members_of_group = strv_copy(g->gr_mem);
if (!iterator->members_of_group)
return -ENOMEM;
iterator->index_members_of_group = 0;
} else {
iterator->nss_iterating = false;
endgrent();
break;
}
}
assert(iterator->found_group_name);
assert(iterator->members_of_group);
assert(!iterator->found_user_name);
if (iterator->members_of_group[iterator->index_members_of_group]) {
_cleanup_free_ char *cu = NULL, *cg = NULL;
if (ret_user) {
cu = strdup(iterator->members_of_group[iterator->index_members_of_group]);
if (!cu)
return -ENOMEM;
}
if (ret_group) {
cg = strdup(iterator->found_group_name);
if (!cg)
return -ENOMEM;
}
if (ret_user)
*ret_user = TAKE_PTR(cu);
if (ret_group)
*ret_group = TAKE_PTR(cg);
iterator->index_members_of_group++;
return 0;
}
iterator->members_of_group = strv_free(iterator->members_of_group);
iterator->found_group_name = mfree(iterator->found_group_name);
}
for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) {
const char *i = iterator->dropins[iterator->current_dropin], *e, *c;
_cleanup_free_ char *un = NULL, *gn = NULL;
e = endswith(i, ".membership");
if (!e)
continue;
c = memchr(i, ':', e - i);
if (!c)
continue;
un = strndup(i, c - i);
if (!un)
return -ENOMEM;
if (iterator->filter_user_name) {
if (!streq(un, iterator->filter_user_name))
continue;
} else if (!valid_user_group_name(un, VALID_USER_RELAX))
continue;
c++; /* skip over ':' */
gn = strndup(c, e - c);
if (!gn)
return -ENOMEM;
if (iterator->filter_group_name) {
if (!streq(gn, iterator->filter_group_name))
continue;
} else if (!valid_user_group_name(gn, VALID_USER_RELAX))
continue;
iterator->current_dropin++;
iterator->n_found++;
if (ret_user)
*ret_user = TAKE_PTR(un);
if (ret_group)
*ret_group = TAKE_PTR(gn);
return 0;
}
r = userdb_process(iterator, NULL, NULL, ret_user, ret_group);
if (r < 0 && iterator->n_found > 0)
return -ESRCH;
return r;
}
int membershipdb_by_group_strv(const char *name, UserDBFlags flags, char ***ret) {
_cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
_cleanup_strv_free_ char **members = NULL;
int r;
assert(name);
assert(ret);
r = membershipdb_by_group(name, flags, &iterator);
if (r < 0)
return r;
for (;;) {
_cleanup_free_ char *user_name = NULL;
r = membershipdb_iterator_get(iterator, &user_name, NULL);
if (r == -ESRCH)
break;
if (r < 0)
return r;
r = strv_consume(&members, TAKE_PTR(user_name));
if (r < 0)
return r;
}
strv_sort_uniq(members);
*ret = TAKE_PTR(members);
return 0;
}
int userdb_block_nss_systemd(int b) {
int r;
/* Note that we might be called from libnss_systemd.so.2 itself, but that should be fine, really. */
_cleanup_(dlclosep) void *dl = NULL;
const char *dle;
r = dlopen_safe(LIBDIR "/libnss_systemd.so.2", &dl, &dle);
if (r < 0) {
/* If the file isn't installed, don't complain loudly */
log_debug_errno(r, "Failed to dlopen(libnss_systemd.so.2), ignoring: %s", dle ?: STRERROR(r));
return 0;
}
log_debug("Loaded '%s' via dlopen()", LIBDIR "/libnss_systemd.so.2");
int (*call)(bool b) = dlsym(dl, "_nss_systemd_block");
if (!call)
/* If the file is installed but lacks the symbol we expect, things are weird, let's complain */
return log_debug_errno(SYNTHETIC_ERRNO(ELIBBAD),
"Unable to find symbol _nss_systemd_block in libnss_systemd.so.2: %s", dlerror());
return call(b);
}
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