[thirdparty/systemd.git] / src / ask-password-api.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 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
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <termios.h>
#include <unistd.h>
#include <sys/poll.h>
#include <sys/inotify.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <string.h>
#include <sys/un.h>
#include <stddef.h>
#include <sys/signalfd.h>

#include "util.h"

#include "ask-password-api.h"

int ask_password_tty(
                const char *message,
                usec_t until,
                const char *flag_file,
                char **_passphrase) {

        struct termios old_termios, new_termios;
        char passphrase[LINE_MAX];
        size_t p = 0;
        int r, ttyfd = -1, notify = -1;
        struct pollfd pollfd[2];
        bool reset_tty = false;
        enum {
                POLL_TTY,
                POLL_INOTIFY
        };

        assert(message);
        assert(_passphrase);

        if (flag_file) {
                if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
                        r = -errno;
                        goto finish;
                }

                if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
                        r = -errno;
                        goto finish;
                }
        }

        if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) {

                if (tcgetattr(ttyfd, &old_termios) < 0) {
                        r = -errno;
                        goto finish;
                }

                loop_write(ttyfd, "\x1B[1m", 4, false);
                loop_write(ttyfd, message, strlen(message), false);
                loop_write(ttyfd, " ", 1, false);
                loop_write(ttyfd, "\x1B[0m", 4, false);

                new_termios = old_termios;
                new_termios.c_lflag &= ~(ICANON|ECHO);
                new_termios.c_cc[VMIN] = 1;
                new_termios.c_cc[VTIME] = 0;

                if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
                        r = -errno;
                        goto finish;
                }

                reset_tty = true;
        }

        zero(pollfd);

        pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
        pollfd[POLL_TTY].events = POLLIN;
        pollfd[POLL_INOTIFY].fd = notify;
        pollfd[POLL_INOTIFY].events = POLLIN;

        for (;;) {
                char c;
                int sleep_for = -1, k;
                ssize_t n;

                if (until > 0) {
                        usec_t y;

                        y = now(CLOCK_MONOTONIC);

                        if (y > until) {
                                r = -ETIMEDOUT;
                                goto finish;
                        }

                        sleep_for = (int) ((until - y) / USEC_PER_MSEC);
                }

                if (flag_file)
                        if (access(flag_file, F_OK) < 0) {
                                r = -errno;
                                goto finish;
                        }

                if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {

                        if (errno == EINTR)
                                continue;

                        r = -errno;
                        goto finish;
                } else if (k == 0) {
                        r = -ETIMEDOUT;
                        goto finish;
                }

                if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
                        flush_fd(notify);

                if (pollfd[POLL_TTY].revents == 0)
                        continue;

                if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {

                        if (errno == EINTR || errno == EAGAIN)
                                continue;

                        r = -errno;
                        goto finish;

                } else if (n == 0)
                        break;

                if (c == '\n')
                        break;
                else if (c == 21) {

                        while (p > 0) {
                                p--;

                                if (ttyfd >= 0)
                                        loop_write(ttyfd, "\b \b", 3, false);
                        }

                } else if (c == '\b' || c == 127) {
                        if (p > 0) {
                                p--;

                                if (ttyfd >= 0)
                                        loop_write(ttyfd, "\b \b", 3, false);
                        }
                } else {
                        passphrase[p++] = c;

                        if (ttyfd >= 0)
                                loop_write(ttyfd, "*", 1, false);
                }
        }

        if (ttyfd >= 0)
                loop_write(ttyfd, "\n", 1, false);

        passphrase[p] = 0;

        if (!(*_passphrase = strdup(passphrase))) {
                r = -ENOMEM;
                goto finish;
        }

        r = 0;

finish:
        if (notify >= 0)
                close_nointr_nofail(notify);

        if (ttyfd >= 0) {
                if (reset_tty)
                        tcsetattr(ttyfd, TCSADRAIN, &old_termios);

                close_nointr_nofail(ttyfd);
        }

        return r;
}

static int create_socket(char **name) {
        int fd;
        union {
                struct sockaddr sa;
                struct sockaddr_un un;
        } sa;
        int one = 1, r;
        char *c;

        assert(name);

        if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
                log_error("socket() failed: %m");
                return -errno;
        }

        zero(sa);
        sa.un.sun_family = AF_UNIX;
        snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/dev/.systemd/ask-password/sck.%llu", random_ull());

        if (bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
                r = -errno;
                log_error("bind() failed: %m");
                goto fail;
        }

        if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
                r = -errno;
                log_error("SO_PASSCRED failed: %m");
                goto fail;
        }

        if (!(c = strdup(sa.un.sun_path))) {
                r = -ENOMEM;
                log_error("Out of memory");
                goto fail;
        }

        *name = c;
        return fd;

fail:
        close_nointr_nofail(fd);

        return r;
}


int ask_password_agent(
                const char *message,
                const char *icon,
                usec_t until,
                char **_passphrase) {

        enum {
                FD_SOCKET,
                FD_SIGNAL,
                _FD_MAX
        };

        char temp[] = "/dev/.systemd/ask-password/tmp.XXXXXX";
        char final[sizeof(temp)] = "";
        int fd = -1, r;
        FILE *f = NULL;
        char *socket_name = NULL;
        int socket_fd = -1, signal_fd = -1;
        sigset_t mask;
        struct pollfd pollfd[_FD_MAX];

        mkdir_p("/dev/.systemd/ask-password", 0755);

        if ((fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY)) < 0) {
                log_error("Failed to create password file: %m");
                r = -errno;
                goto finish;
        }

        fchmod(fd, 0644);

        if (!(f = fdopen(fd, "w"))) {
                log_error("Failed to allocate FILE: %m");
                r = -errno;
                goto finish;
        }

        fd = -1;

        assert_se(sigemptyset(&mask) == 0);
        sigset_add_many(&mask, SIGINT, SIGTERM, -1);
        assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);

        if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
                log_error("signalfd(): %m");
                r = -errno;
                goto finish;
        }

        if ((socket_fd = create_socket(&socket_name)) < 0) {
                r = socket_fd;
                goto finish;
        }

        fprintf(f,
                "[Ask]\n"
                "PID=%lu\n"
                "Socket=%s\n"
                "NotAfter=%llu\n",
                (unsigned long) getpid(),
                socket_name,
                (unsigned long long) until);

        if (message)
                fprintf(f, "Message=%s\n", message);

        if (icon)
                fprintf(f, "Icon=%s\n", icon);

        fflush(f);

        if (ferror(f)) {
                log_error("Failed to write query file: %m");
                r = -errno;
                goto finish;
        }

        memcpy(final, temp, sizeof(temp));

        final[sizeof(final)-11] = 'a';
        final[sizeof(final)-10] = 's';
        final[sizeof(final)-9] = 'k';

        if (rename(temp, final) < 0) {
                log_error("Failed to rename query file: %m");
                r = -errno;
                goto finish;
        }

        zero(pollfd);
        pollfd[FD_SOCKET].fd = socket_fd;
        pollfd[FD_SOCKET].events = POLLIN;
        pollfd[FD_SIGNAL].fd = signal_fd;
        pollfd[FD_SIGNAL].events = POLLIN;

        for (;;) {
                char passphrase[LINE_MAX+1];
                struct msghdr msghdr;
                struct iovec iovec;
                struct ucred *ucred;
                union {
                        struct cmsghdr cmsghdr;
                        uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
                } control;
                ssize_t n;
                int k;
                usec_t t;

                t = now(CLOCK_MONOTONIC);

                if (until <= t) {
                        log_notice("Timed out");
                        r = -ETIME;
                        goto finish;
                }

                if ((k = poll(pollfd, _FD_MAX, until-t/USEC_PER_MSEC)) < 0) {

                        if (errno == EINTR)
                                continue;

                        log_error("poll() failed: %m");
                        r = -errno;
                        goto finish;
                }

                if (k <= 0) {
                        log_notice("Timed out");
                        r = -ETIME;
                        goto finish;
                }

                if (pollfd[FD_SIGNAL].revents & POLLIN)
                        break;

                if (pollfd[FD_SOCKET].revents != POLLIN) {
                        log_error("Unexpected poll() event.");
                        r = -EIO;
                        goto finish;
                }

                zero(iovec);
                iovec.iov_base = passphrase;
                iovec.iov_len = sizeof(passphrase)-1;

                zero(control);
                zero(msghdr);
                msghdr.msg_iov = &iovec;
                msghdr.msg_iovlen = 1;
                msghdr.msg_control = &control;
                msghdr.msg_controllen = sizeof(control);

                if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {

                        if (errno == EAGAIN ||
                            errno == EINTR)
                                continue;

                        log_error("recvmsg() failed: %m");
                        r = -errno;
                        goto finish;
                }

                if (n <= 0) {
                        log_error("Message too short");
                        continue;
                }

                if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
                    control.cmsghdr.cmsg_level != SOL_SOCKET ||
                    control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
                    control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
                        log_warning("Received message without credentials. Ignoring.");
                        continue;
                }

                ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
                if (ucred->uid != 0) {
                        log_warning("Got request from unprivileged user. Ignoring.");
                        continue;
                }

                if (passphrase[0] == '+') {
                        passphrase[n] = 0;

                        if (!(*_passphrase = strdup(passphrase+1))) {
                                r = -ENOMEM;
                                goto finish;
                        }

                } else if (passphrase[0] == '-') {
                        r = -ECANCELED;
                        goto finish;
                } else {
                        log_error("Invalid packet");
                        continue;
                }

                break;
        }

        r = 0;

finish:
        if (fd >= 0)
                close_nointr_nofail(fd);

        if (socket_name) {
                unlink(socket_name);
                free(socket_name);
        }

        if (socket_fd >= 0)
                close_nointr_nofail(socket_fd);

        if (signal_fd >= 0)
                close_nointr_nofail(signal_fd);

        if (f)
                fclose(f);

        unlink(temp);

        if (final[0])
                unlink(final);

        return r;
}

int ask_password_auto(const char *message, const char *icon, usec_t until, char **_passphrase) {
        assert(message);
        assert(_passphrase);

        if (isatty(STDIN_FILENO))
                return ask_password_tty(message, until, NULL, _passphrase);
        else
                return ask_password_agent(message, icon, until, _passphrase);
}
Commit	Line	Data
7f4e0805 LP	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
	22	#include <termios.h>
	23	#include <unistd.h>
	24	#include <sys/poll.h>
	25	#include <sys/inotify.h>
	26	#include <errno.h>
	27	#include <fcntl.h>
	28	#include <sys/socket.h>
	29	#include <string.h>
	30	#include <sys/un.h>
	31	#include <stddef.h>
	32	#include <sys/signalfd.h>
	33
	34	#include "util.h"
	35
	36	#include "ask-password-api.h"
	37
	38	int ask_password_tty(
	39	const char *message,
	40	usec_t until,
	41	const char *flag_file,
	42	char **_passphrase) {
	43
	44	struct termios old_termios, new_termios;
	45	char passphrase[LINE_MAX];
	46	size_t p = 0;
	47	int r, ttyfd = -1, notify = -1;
	48	struct pollfd pollfd[2];
	49	bool reset_tty = false;
	50	enum {
	51	POLL_TTY,
	52	POLL_INOTIFY
	53	};
	54
	55	assert(message);
	56	assert(_passphrase);
	57
	58	if (flag_file) {
	59	if ((notify = inotify_init1(IN_CLOEXEC\|IN_NONBLOCK)) < 0) {
	60	r = -errno;
	61	goto finish;
	62	}
	63
	64	if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
65	r = -errno;
66	goto finish;
67	}
68	}
69
70	if ((ttyfd = open("/dev/tty", O_RDWR\|O_NOCTTY\|O_CLOEXEC)) >= 0) {
71
72	if (tcgetattr(ttyfd, &old_termios) < 0) {
73	r = -errno;
74	goto finish;
75	}
76
77	loop_write(ttyfd, "\x1B[1m", 4, false);
78	loop_write(ttyfd, message, strlen(message), false);
bd1db33f	79	loop_write(ttyfd, " ", 1, false);
7f4e0805 LP	80	loop_write(ttyfd, "\x1B[0m", 4, false);
	81
	82	new_termios = old_termios;
	83	new_termios.c_lflag &= ~(ICANON\|ECHO);
	84	new_termios.c_cc[VMIN] = 1;
	85	new_termios.c_cc[VTIME] = 0;
	86
	87	if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
	88	r = -errno;
	89	goto finish;
	90	}
	91
	92	reset_tty = true;
	93	}
	94
	95	zero(pollfd);
	96
	97	pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
	98	pollfd[POLL_TTY].events = POLLIN;
	99	pollfd[POLL_INOTIFY].fd = notify;
	100	pollfd[POLL_INOTIFY].events = POLLIN;
	101
	102	for (;;) {
	103	char c;
	104	int sleep_for = -1, k;
	105	ssize_t n;
	106
	107	if (until > 0) {
	108	usec_t y;
	109
	110	y = now(CLOCK_MONOTONIC);
	111
	112	if (y > until) {
	113	r = -ETIMEDOUT;
	114	goto finish;
	115	}
	116
	117	sleep_for = (int) ((until - y) / USEC_PER_MSEC);
	118	}
	119
	120	if (flag_file)
	121	if (access(flag_file, F_OK) < 0) {
	122	r = -errno;
	123	goto finish;
	124	}
	125
	126	if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
	127
	128	if (errno == EINTR)
	129	continue;
	130
	131	r = -errno;
	132	goto finish;
	133	} else if (k == 0) {
	134	r = -ETIMEDOUT;
	135	goto finish;
	136	}
	137
	138	if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
	139	flush_fd(notify);
	140
	141	if (pollfd[POLL_TTY].revents == 0)
	142	continue;
	143
144	if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
145
146	if (errno == EINTR \|\| errno == EAGAIN)
147	continue;
148
149	r = -errno;
150	goto finish;
151
152	} else if (n == 0)
153	break;
154
155	if (c == '\n')
156	break;
157	else if (c == 21) {
158
159	while (p > 0) {
160	p--;
161
162	if (ttyfd >= 0)
163	loop_write(ttyfd, "\b \b", 3, false);
164	}
165
166	} else if (c == '\b' \|\| c == 127) {
167	if (p > 0) {
168	p--;
169
170	if (ttyfd >= 0)
171	loop_write(ttyfd, "\b \b", 3, false);
172	}
173	} else {
174	passphrase[p++] = c;
175
176	if (ttyfd >= 0)
177	loop_write(ttyfd, "*", 1, false);
178	}
179	}
180
181	if (ttyfd >= 0)
182	loop_write(ttyfd, "\n", 1, false);
183
184	passphrase[p] = 0;
185
186	if (!(*_passphrase = strdup(passphrase))) {
187	r = -ENOMEM;
188	goto finish;
189	}
190
191	r = 0;
192
193	finish:
194	if (notify >= 0)
195	close_nointr_nofail(notify);
196
197	if (ttyfd >= 0) {
198	if (reset_tty)
199	tcsetattr(ttyfd, TCSADRAIN, &old_termios);
200
201	close_nointr_nofail(ttyfd);
202	}
203
204	return r;
205	}
206
207	static int create_socket(char **name) {
208	int fd;
209	union {
210	struct sockaddr sa;
211	struct sockaddr_un un;
212	} sa;
213	int one = 1, r;
214	char *c;
215
216	assert(name);
217
218	if ((fd = socket(AF_UNIX, SOCK_DGRAM\|SOCK_CLOEXEC\|SOCK_NONBLOCK, 0)) < 0) {
219	log_error("socket() failed: %m");
220	return -errno;
221	}
222
223	zero(sa);
224	sa.un.sun_family = AF_UNIX;
225	snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/dev/.systemd/ask-password/sck.%llu", random_ull());
226
227	if (bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
228	r = -errno;
229	log_error("bind() failed: %m");
230	goto fail;
231	}
232
233	if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
234	r = -errno;
235	log_error("SO_PASSCRED failed: %m");
236	goto fail;
237	}
238
239	if (!(c = strdup(sa.un.sun_path))) {
240	r = -ENOMEM;
241	log_error("Out of memory");
242	goto fail;
243	}
244
245	*name = c;
246	return fd;
247
248	fail:
249	close_nointr_nofail(fd);
250
251	return r;
252	}
253
254
255	int ask_password_agent(
256	const char *message,
257	const char *icon,
258	usec_t until,
259	char **_passphrase) {
260
261	enum {
262	FD_SOCKET,
263	FD_SIGNAL,
264	_FD_MAX
265	};
266
267	char temp[] = "/dev/.systemd/ask-password/tmp.XXXXXX";
268	char final[sizeof(temp)] = "";
269	int fd = -1, r;
270	FILE *f = NULL;
271	char *socket_name = NULL;
272	int socket_fd = -1, signal_fd = -1;
273	sigset_t mask;
274	struct pollfd pollfd[_FD_MAX];
275
276	mkdir_p("/dev/.systemd/ask-password", 0755);
277
278	if ((fd = mkostemp(temp, O_CLOEXEC\|O_CREAT\|O_WRONLY)) < 0) {
279	log_error("Failed to create password file: %m");
280	r = -errno;
281	goto finish;
282	}
283
284	fchmod(fd, 0644);
285
286	if (!(f = fdopen(fd, "w"))) {
287	log_error("Failed to allocate FILE: %m");
288	r = -errno;
289	goto finish;
290	}
291
292	fd = -1;
293
294	assert_se(sigemptyset(&mask) == 0);
295	sigset_add_many(&mask, SIGINT, SIGTERM, -1);
296	assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
297
298	if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK\|SFD_CLOEXEC)) < 0) {
299	log_error("signalfd(): %m");
300	r = -errno;
301	goto finish;
302	}
303
304	if ((socket_fd = create_socket(&socket_name)) < 0) {
305	r = socket_fd;
306	goto finish;
307	}
308
309	fprintf(f,
310	"[Ask]\n"
311	"PID=%lu\n"
312	"Socket=%s\n"
313	"NotAfter=%llu\n",
314	(unsigned long) getpid(),
315	socket_name,
316	(unsigned long long) until);
317
318	if (message)
319	fprintf(f, "Message=%s\n", message);
320
321	if (icon)
322	fprintf(f, "Icon=%s\n", icon);
323
324	fflush(f);
325
326	if (ferror(f)) {
327	log_error("Failed to write query file: %m");
328	r = -errno;
329	goto finish;
330	}
331
332	memcpy(final, temp, sizeof(temp));
333
334	final[sizeof(final)-11] = 'a';
335	final[sizeof(final)-10] = 's';
336	final[sizeof(final)-9] = 'k';
337
338	if (rename(temp, final) < 0) {
339	log_error("Failed to rename query file: %m");
340	r = -errno;
341	goto finish;
342	}
343
344	zero(pollfd);
345	pollfd[FD_SOCKET].fd = socket_fd;
346	pollfd[FD_SOCKET].events = POLLIN;
347	pollfd[FD_SIGNAL].fd = signal_fd;
348	pollfd[FD_SIGNAL].events = POLLIN;
349
350	for (;;) {
351	char passphrase[LINE_MAX+1];
352	struct msghdr msghdr;
353	struct iovec iovec;
354	struct ucred *ucred;
355	union {
356	struct cmsghdr cmsghdr;
357	uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
358	} control;
359	ssize_t n;
360	int k;
361	usec_t t;
362
363	t = now(CLOCK_MONOTONIC);
364
365	if (until <= t) {
366	log_notice("Timed out");
367	r = -ETIME;
368	goto finish;
369	}
370
371	if ((k = poll(pollfd, _FD_MAX, until-t/USEC_PER_MSEC)) < 0) {
372
373	if (errno == EINTR)
374	continue;
375
376	log_error("poll() failed: %m");
377	r = -errno;
378	goto finish;
379	}
380
381	if (k <= 0) {
382	log_notice("Timed out");
383	r = -ETIME;
384	goto finish;
385	}
386
387	if (pollfd[FD_SIGNAL].revents & POLLIN)
388	break;
389
390	if (pollfd[FD_SOCKET].revents != POLLIN) {
391	log_error("Unexpected poll() event.");
392	r = -EIO;
393	goto finish;
394	}
395
396	zero(iovec);
397	iovec.iov_base = passphrase;
398	iovec.iov_len = sizeof(passphrase)-1;
399
400	zero(control);
401	zero(msghdr);
402	msghdr.msg_iov = &iovec;
403	msghdr.msg_iovlen = 1;
404	msghdr.msg_control = &control;
405	msghdr.msg_controllen = sizeof(control);
406
407	if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
408
409	if (errno == EAGAIN \|\|
410	errno == EINTR)
411	continue;
412
413	log_error("recvmsg() failed: %m");
414	r = -errno;
415	goto finish;
416	}
417
418	if (n <= 0) {
419	log_error("Message too short");
420	continue;
421	}
422
423	if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) \|\|
424	control.cmsghdr.cmsg_level != SOL_SOCKET \|\|
425	control.cmsghdr.cmsg_type != SCM_CREDENTIALS \|\|
426	control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
427	log_warning("Received message without credentials. Ignoring.");
428	continue;
429	}
430
431	ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
432	if (ucred->uid != 0) {
433	log_warning("Got request from unprivileged user. Ignoring.");
434	continue;
435	}
436
437	if (passphrase[0] == '+') {
438	passphrase[n] = 0;
439
440	if (!(*_passphrase = strdup(passphrase+1))) {
441	r = -ENOMEM;
442	goto finish;
443	}
444
445	} else if (passphrase[0] == '-') {
446	r = -ECANCELED;
447	goto finish;
448	} else {
449	log_error("Invalid packet");
450	continue;
451	}
452
453	break;
454	}
455
456	r = 0;
457
458	finish:
459	if (fd >= 0)
460	close_nointr_nofail(fd);
461
462	if (socket_name) {
463	unlink(socket_name);
464	free(socket_name);
465	}
466
467	if (socket_fd >= 0)
468	close_nointr_nofail(socket_fd);
469
470	if (signal_fd >= 0)
471	close_nointr_nofail(signal_fd);
472
473	if (f)
474	fclose(f);
475
476	unlink(temp);
477
478	if (final[0])
479	unlink(final);
480
481	return r;
482	}
260ab287 LP	483
	484	int ask_password_auto(const char message, const char icon, usec_t until, char **_passphrase) {
	485	assert(message);
	486	assert(_passphrase);
	487
	488	if (isatty(STDIN_FILENO))
	489	return ask_password_tty(message, until, NULL, _passphrase);
	490	else
	491	return ask_password_agent(message, icon, until, _passphrase);
	492	}