333 lines
9.5 KiB
C
333 lines
9.5 KiB
C
/***
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This file is part of systemd.
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Copyright 2016 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <nss.h>
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#include "sd-bus.h"
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#include "bus-common-errors.h"
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#include "env-util.h"
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#include "macro.h"
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#include "nss-util.h"
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#include "signal-util.h"
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#include "user-util.h"
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#include "util.h"
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NSS_GETPW_PROTOTYPES(systemd);
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NSS_GETGR_PROTOTYPES(systemd);
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enum nss_status _nss_systemd_getpwnam_r(
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const char *name,
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struct passwd *pwd,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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uint32_t translated;
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size_t l;
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int r;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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assert(name);
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assert(pwd);
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/* Make sure that we don't go in circles when allocating a dynamic UID by checking our own database */
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if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
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goto not_found;
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r = sd_bus_open_system(&bus);
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if (r < 0)
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goto fail;
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r = sd_bus_call_method(bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"LookupDynamicUserByName",
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&error,
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&reply,
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"s",
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name);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "u", &translated);
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if (r < 0)
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goto fail;
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l = strlen(name);
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if (buflen < l+1) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy(buffer, name, l+1);
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pwd->pw_name = buffer;
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pwd->pw_uid = (uid_t) translated;
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pwd->pw_gid = (uid_t) translated;
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pwd->pw_gecos = (char*) "Dynamic User";
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pwd->pw_passwd = (char*) "*"; /* locked */
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pwd->pw_dir = (char*) "/";
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pwd->pw_shell = (char*) "/sbin/nologin";
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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enum nss_status _nss_systemd_getpwuid_r(
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uid_t uid,
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struct passwd *pwd,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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const char *translated;
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size_t l;
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int r;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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if (!uid_is_valid(uid)) {
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r = -EINVAL;
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goto fail;
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}
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if (uid <= SYSTEM_UID_MAX)
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goto not_found;
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if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
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goto not_found;
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r = sd_bus_open_system(&bus);
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if (r < 0)
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goto fail;
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r = sd_bus_call_method(bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"LookupDynamicUserByUID",
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&error,
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&reply,
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"u",
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(uint32_t) uid);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "s", &translated);
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if (r < 0)
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goto fail;
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l = strlen(translated) + 1;
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if (buflen < l) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy(buffer, translated, l);
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pwd->pw_name = buffer;
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pwd->pw_uid = uid;
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pwd->pw_gid = uid;
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pwd->pw_gecos = (char*) "Dynamic User";
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pwd->pw_passwd = (char*) "*"; /* locked */
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pwd->pw_dir = (char*) "/";
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pwd->pw_shell = (char*) "/sbin/nologin";
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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enum nss_status _nss_systemd_getgrnam_r(
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const char *name,
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struct group *gr,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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uint32_t translated;
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size_t l;
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int r;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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assert(name);
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assert(gr);
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if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
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goto not_found;
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r = sd_bus_open_system(&bus);
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if (r < 0)
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goto fail;
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r = sd_bus_call_method(bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"LookupDynamicUserByName",
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&error,
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&reply,
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"s",
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name);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "u", &translated);
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if (r < 0)
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goto fail;
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l = sizeof(char*) + strlen(name) + 1;
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if (buflen < l) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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memzero(buffer, sizeof(char*));
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strcpy(buffer + sizeof(char*), name);
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gr->gr_name = buffer + sizeof(char*);
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gr->gr_gid = (gid_t) translated;
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gr->gr_passwd = (char*) "*"; /* locked */
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gr->gr_mem = (char**) buffer;
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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enum nss_status _nss_systemd_getgrgid_r(
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gid_t gid,
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struct group *gr,
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char *buffer, size_t buflen,
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int *errnop) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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_cleanup_(sd_bus_message_unrefp) sd_bus_message* reply = NULL;
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL;
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const char *translated;
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size_t l;
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int r;
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BLOCK_SIGNALS(NSS_SIGNALS_BLOCK);
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if (!gid_is_valid(gid)) {
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r = -EINVAL;
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goto fail;
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}
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if (gid <= SYSTEM_GID_MAX)
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goto not_found;
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if (getenv_bool("SYSTEMD_NSS_DYNAMIC_BYPASS") > 0)
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goto not_found;
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r = sd_bus_open_system(&bus);
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if (r < 0)
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goto fail;
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r = sd_bus_call_method(bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"LookupDynamicUserByUID",
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&error,
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&reply,
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"u",
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(uint32_t) gid);
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if (r < 0) {
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if (sd_bus_error_has_name(&error, BUS_ERROR_NO_SUCH_DYNAMIC_USER))
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goto not_found;
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goto fail;
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}
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r = sd_bus_message_read(reply, "s", &translated);
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if (r < 0)
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goto fail;
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l = sizeof(char*) + strlen(translated) + 1;
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if (buflen < l) {
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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memzero(buffer, sizeof(char*));
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strcpy(buffer + sizeof(char*), translated);
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gr->gr_name = buffer + sizeof(char*);
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gr->gr_gid = gid;
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gr->gr_passwd = (char*) "*"; /* locked */
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gr->gr_mem = (char**) buffer;
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*errnop = 0;
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return NSS_STATUS_SUCCESS;
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not_found:
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*errnop = 0;
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return NSS_STATUS_NOTFOUND;
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fail:
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*errnop = -r;
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return NSS_STATUS_UNAVAIL;
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}
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