[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 <stdbool.h>
#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 "strv.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;
        bool silent_mode = 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 = -ETIME;
                                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 = -ETIME;
                        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 && !silent_mode) {
                                silent_mode = true;
                                loop_write(ttyfd, "(no echo) ", 10, false);
                        } else if (p > 0) {
                                p--;

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

                        if (!silent_mode && ttyfd >= 0)
                                loop_write(ttyfd, "*", 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) {
                        loop_write(ttyfd, "\n", 1, false);
                        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, "/run/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,
                bool accept_cached,
                char ***_passphrases) {

        enum {
                FD_SOCKET,
                FD_SIGNAL,
                _FD_MAX
        };

        char temp[] = "/run/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, oldmask;
        struct pollfd pollfd[_FD_MAX];

        assert(_passphrases);

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

        mkdir_p("/run/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;

        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"
                "AcceptCached=%i\n"
                "NotAfter=%llu\n",
                (unsigned long) getpid(),
                socket_name,
                accept_cached ? 1 : 0,
                (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) {
                        r = -EINTR;
                        goto finish;
                }

                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);

                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] == '+') {
                        char **l;

                        if (!(l = strv_parse_nulstr(passphrase+1, n-1))) {
                                r = -ENOMEM;
                                goto finish;
                        }

                        if (strv_length(l) <= 0) {
                                strv_free(l);
                                log_error("Invalid packet");
                                continue;
                        }

                        *_passphrases = l;

                } 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);

        assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);

        return r;
}

int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
        assert(message);
        assert(_passphrases);

        if (isatty(STDIN_FILENO)) {
                int r;
                char *s = NULL, **l = NULL;

                if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
                        return r;

                l = strv_new(s, NULL);
                free(s);

                if (!l)
                        return -ENOMEM;

                *_passphrases = l;
                return r;

        } else
                return ask_password_agent(message, icon, until, accept_cached, _passphrases);
}
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	***/
d1676230	21	#include <stdbool.h>
7f4e0805 LP	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"
21bc923a	35	#include "strv.h"
7f4e0805 LP	36
	37	#include "ask-password-api.h"
	38
	39	int ask_password_tty(
	40	const char *message,
	41	usec_t until,
	42	const char *flag_file,
	43	char **_passphrase) {
	44
	45	struct termios old_termios, new_termios;
	46	char passphrase[LINE_MAX];
	47	size_t p = 0;
	48	int r, ttyfd = -1, notify = -1;
	49	struct pollfd pollfd[2];
	50	bool reset_tty = false;
d1676230	51	bool silent_mode = false;
7f4e0805 LP	52	enum {
	53	POLL_TTY,
	54	POLL_INOTIFY
	55	};
	56
	57	assert(message);
	58	assert(_passphrase);
	59
	60	if (flag_file) {
	61	if ((notify = inotify_init1(IN_CLOEXEC\|IN_NONBLOCK)) < 0) {
	62	r = -errno;
	63	goto finish;
	64	}
	65
	66	if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
	67	r = -errno;
	68	goto finish;
	69	}
	70	}
	71
	72	if ((ttyfd = open("/dev/tty", O_RDWR\|O_NOCTTY\|O_CLOEXEC)) >= 0) {
	73
	74	if (tcgetattr(ttyfd, &old_termios) < 0) {
	75	r = -errno;
	76	goto finish;
	77	}
	78
	79	loop_write(ttyfd, "\x1B[1m", 4, false);
	80	loop_write(ttyfd, message, strlen(message), false);
bd1db33f	81	loop_write(ttyfd, " ", 1, false);
7f4e0805 LP	82	loop_write(ttyfd, "\x1B[0m", 4, false);
	83
	84	new_termios = old_termios;
	85	new_termios.c_lflag &= ~(ICANON\|ECHO);
	86	new_termios.c_cc[VMIN] = 1;
	87	new_termios.c_cc[VTIME] = 0;
	88
	89	if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
	90	r = -errno;
	91	goto finish;
	92	}
	93
	94	reset_tty = true;
	95	}
	96
	97	zero(pollfd);
	98
	99	pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
	100	pollfd[POLL_TTY].events = POLLIN;
	101	pollfd[POLL_INOTIFY].fd = notify;
	102	pollfd[POLL_INOTIFY].events = POLLIN;
	103
	104	for (;;) {
	105	char c;
	106	int sleep_for = -1, k;
	107	ssize_t n;
	108
	109	if (until > 0) {
	110	usec_t y;
	111
	112	y = now(CLOCK_MONOTONIC);
	113
	114	if (y > until) {
7ded2e28	115	r = -ETIME;
7f4e0805 LP	116	goto finish;
	117	}
	118
	119	sleep_for = (int) ((until - y) / USEC_PER_MSEC);
	120	}
	121
	122	if (flag_file)
	123	if (access(flag_file, F_OK) < 0) {
	124	r = -errno;
	125	goto finish;
	126	}
	127
	128	if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
	129
	130	if (errno == EINTR)
	131	continue;
	132
	133	r = -errno;
	134	goto finish;
	135	} else if (k == 0) {
ccc80078	136	r = -ETIME;
7f4e0805 LP	137	goto finish;
	138	}
	139
	140	if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
	141	flush_fd(notify);
	142
	143	if (pollfd[POLL_TTY].revents == 0)
	144	continue;
	145
	146	if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
	147
	148	if (errno == EINTR \|\| errno == EAGAIN)
	149	continue;
	150
	151	r = -errno;
	152	goto finish;
	153
	154	} else if (n == 0)
	155	break;
	156
	157	if (c == '\n')
	158	break;
	159	else if (c == 21) {
7f4e0805 LP	160	while (p > 0) {
	161	p--;
	162
	163	if (ttyfd >= 0)
	164	loop_write(ttyfd, "\b \b", 3, false);
	165	}
	166
	167	} else if (c == '\b' \|\| c == 127) {
d1676230 JE	168	if (p == 0 && !silent_mode) {
	169	silent_mode = true;
	170	loop_write(ttyfd, "(no echo) ", 10, false);
	171	} else if (p > 0) {
7f4e0805 LP	172	p--;
	173
	174	if (ttyfd >= 0)
	175	loop_write(ttyfd, "\b \b", 3, false);
	176	}
	177	} else {
	178	passphrase[p++] = c;
	179
d1676230	180	if (!silent_mode && ttyfd >= 0)
7f4e0805 LP	181	loop_write(ttyfd, "*", 1, false);
	182	}
	183	}
	184
7f4e0805 LP	185	passphrase[p] = 0;
	186
	187	if (!(*_passphrase = strdup(passphrase))) {
	188	r = -ENOMEM;
	189	goto finish;
	190	}
	191
	192	r = 0;
	193
	194	finish:
	195	if (notify >= 0)
	196	close_nointr_nofail(notify);
	197
	198	if (ttyfd >= 0) {
c0f9c7da LP	199
	200	if (reset_tty) {
	201	loop_write(ttyfd, "\n", 1, false);
7f4e0805	202	tcsetattr(ttyfd, TCSADRAIN, &old_termios);
c0f9c7da	203	}
7f4e0805 LP	204
	205	close_nointr_nofail(ttyfd);
	206	}
	207
	208	return r;
	209	}
	210
	211	static int create_socket(char **name) {
	212	int fd;
	213	union {
	214	struct sockaddr sa;
	215	struct sockaddr_un un;
	216	} sa;
	217	int one = 1, r;
	218	char *c;
	219
	220	assert(name);
	221
	222	if ((fd = socket(AF_UNIX, SOCK_DGRAM\|SOCK_CLOEXEC\|SOCK_NONBLOCK, 0)) < 0) {
	223	log_error("socket() failed: %m");
	224	return -errno;
	225	}
	226
	227	zero(sa);
	228	sa.un.sun_family = AF_UNIX;
2b583ce6	229	snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull());
7f4e0805 LP	230
	231	if (bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
	232	r = -errno;
	233	log_error("bind() failed: %m");
	234	goto fail;
	235	}
	236
	237	if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
	238	r = -errno;
	239	log_error("SO_PASSCRED failed: %m");
	240	goto fail;
	241	}
	242
	243	if (!(c = strdup(sa.un.sun_path))) {
	244	r = -ENOMEM;
	245	log_error("Out of memory");
	246	goto fail;
	247	}
	248
	249	*name = c;
	250	return fd;
	251
	252	fail:
	253	close_nointr_nofail(fd);
	254
	255	return r;
	256	}
	257
7f4e0805 LP	258	int ask_password_agent(
	259	const char *message,
	260	const char *icon,
	261	usec_t until,
21bc923a LP	262	bool accept_cached,
21bc923a LP	263	char ***_passphrases) {
7f4e0805 LP	264
	265	enum {
	266	FD_SOCKET,
	267	FD_SIGNAL,
	268	_FD_MAX
	269	};
	270
2b583ce6	271	char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
7f4e0805 LP	272	char final[sizeof(temp)] = "";
	273	int fd = -1, r;
	274	FILE *f = NULL;
	275	char *socket_name = NULL;
	276	int socket_fd = -1, signal_fd = -1;
f9b72cd8	277	sigset_t mask, oldmask;
7f4e0805 LP	278	struct pollfd pollfd[_FD_MAX];
7f4e0805 LP	279
21bc923a LP	280	assert(_passphrases);
21bc923a LP	281
f9b72cd8 LP	282	assert_se(sigemptyset(&mask) == 0);
	283	sigset_add_many(&mask, SIGINT, SIGTERM, -1);
	284	assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
	285
2b583ce6	286	mkdir_p("/run/systemd/ask-password", 0755);
7f4e0805 LP	287
	288	if ((fd = mkostemp(temp, O_CLOEXEC\|O_CREAT\|O_WRONLY)) < 0) {
	289	log_error("Failed to create password file: %m");
	290	r = -errno;
	291	goto finish;
	292	}
	293
	294	fchmod(fd, 0644);
	295
	296	if (!(f = fdopen(fd, "w"))) {
	297	log_error("Failed to allocate FILE: %m");
	298	r = -errno;
	299	goto finish;
	300	}
	301
	302	fd = -1;
	303
7f4e0805 LP	304	if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK\|SFD_CLOEXEC)) < 0) {
	305	log_error("signalfd(): %m");
	306	r = -errno;
	307	goto finish;
	308	}
	309
	310	if ((socket_fd = create_socket(&socket_name)) < 0) {
	311	r = socket_fd;
	312	goto finish;
	313	}
	314
	315	fprintf(f,
	316	"[Ask]\n"
	317	"PID=%lu\n"
	318	"Socket=%s\n"
21bc923a	319	"AcceptCached=%i\n"
7f4e0805 LP	320	"NotAfter=%llu\n",
	321	(unsigned long) getpid(),
	322	socket_name,
21bc923a	323	accept_cached ? 1 : 0,
7f4e0805 LP	324	(unsigned long long) until);
	325
	326	if (message)
	327	fprintf(f, "Message=%s\n", message);
	328
	329	if (icon)
	330	fprintf(f, "Icon=%s\n", icon);
	331
	332	fflush(f);
	333
	334	if (ferror(f)) {
	335	log_error("Failed to write query file: %m");
	336	r = -errno;
	337	goto finish;
	338	}
	339
	340	memcpy(final, temp, sizeof(temp));
	341
	342	final[sizeof(final)-11] = 'a';
	343	final[sizeof(final)-10] = 's';
	344	final[sizeof(final)-9] = 'k';
	345
	346	if (rename(temp, final) < 0) {
	347	log_error("Failed to rename query file: %m");
	348	r = -errno;
	349	goto finish;
	350	}
	351
	352	zero(pollfd);
	353	pollfd[FD_SOCKET].fd = socket_fd;
	354	pollfd[FD_SOCKET].events = POLLIN;
	355	pollfd[FD_SIGNAL].fd = signal_fd;
	356	pollfd[FD_SIGNAL].events = POLLIN;
	357
	358	for (;;) {
	359	char passphrase[LINE_MAX+1];
	360	struct msghdr msghdr;
	361	struct iovec iovec;
	362	struct ucred *ucred;
	363	union {
	364	struct cmsghdr cmsghdr;
	365	uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
	366	} control;
	367	ssize_t n;
	368	int k;
	369	usec_t t;
	370
	371	t = now(CLOCK_MONOTONIC);
	372
	373	if (until <= t) {
	374	log_notice("Timed out");
	375	r = -ETIME;
	376	goto finish;
	377	}
	378
7ded2e28	379	if ((k = poll(pollfd, _FD_MAX, (until-t)/USEC_PER_MSEC)) < 0) {
7f4e0805 LP	380
	381	if (errno == EINTR)
	382	continue;
	383
	384	log_error("poll() failed: %m");
	385	r = -errno;
	386	goto finish;
	387	}
	388
	389	if (k <= 0) {
	390	log_notice("Timed out");
	391	r = -ETIME;
	392	goto finish;
	393	}
	394
21bc923a LP	395	if (pollfd[FD_SIGNAL].revents & POLLIN) {
	396	r = -EINTR;
	397	goto finish;
	398	}
7f4e0805 LP	399
	400	if (pollfd[FD_SOCKET].revents != POLLIN) {
	401	log_error("Unexpected poll() event.");
	402	r = -EIO;
	403	goto finish;
	404	}
	405
	406	zero(iovec);
	407	iovec.iov_base = passphrase;
21bc923a	408	iovec.iov_len = sizeof(passphrase);
7f4e0805 LP	409
	410	zero(control);
	411	zero(msghdr);
	412	msghdr.msg_iov = &iovec;
	413	msghdr.msg_iovlen = 1;
	414	msghdr.msg_control = &control;
	415	msghdr.msg_controllen = sizeof(control);
	416
	417	if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
	418
	419	if (errno == EAGAIN \|\|
	420	errno == EINTR)
	421	continue;
	422
	423	log_error("recvmsg() failed: %m");
	424	r = -errno;
	425	goto finish;
	426	}
	427
	428	if (n <= 0) {
	429	log_error("Message too short");
	430	continue;
	431	}
	432
	433	if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) \|\|
	434	control.cmsghdr.cmsg_level != SOL_SOCKET \|\|
	435	control.cmsghdr.cmsg_type != SCM_CREDENTIALS \|\|
	436	control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
	437	log_warning("Received message without credentials. Ignoring.");
	438	continue;
	439	}
	440
	441	ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
	442	if (ucred->uid != 0) {
	443	log_warning("Got request from unprivileged user. Ignoring.");
	444	continue;
	445	}
	446
	447	if (passphrase[0] == '+') {
21bc923a	448	char **l;
7f4e0805	449
21bc923a	450	if (!(l = strv_parse_nulstr(passphrase+1, n-1))) {
7f4e0805 LP	451	r = -ENOMEM;
	452	goto finish;
	453	}
	454
21bc923a LP	455	if (strv_length(l) <= 0) {
	456	strv_free(l);
	457	log_error("Invalid packet");
	458	continue;
	459	}
	460
	461	*_passphrases = l;
	462
7f4e0805 LP	463	} else if (passphrase[0] == '-') {
	464	r = -ECANCELED;
	465	goto finish;
	466	} else {
	467	log_error("Invalid packet");
	468	continue;
	469	}
	470
	471	break;
	472	}
	473
	474	r = 0;
	475
	476	finish:
	477	if (fd >= 0)
	478	close_nointr_nofail(fd);
	479
	480	if (socket_name) {
	481	unlink(socket_name);
	482	free(socket_name);
	483	}
	484
	485	if (socket_fd >= 0)
	486	close_nointr_nofail(socket_fd);
	487
	488	if (signal_fd >= 0)
	489	close_nointr_nofail(signal_fd);
	490
	491	if (f)
	492	fclose(f);
	493
	494	unlink(temp);
	495
	496	if (final[0])
	497	unlink(final);
	498
f9b72cd8 LP	499	assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
f9b72cd8 LP	500
7f4e0805 LP	501	return r;
7f4e0805 LP	502	}
260ab287	503
21bc923a	504	int ask_password_auto(const char message, const char icon, usec_t until, bool accept_cached, char ***_passphrases) {
260ab287	505	assert(message);
21bc923a LP	506	assert(_passphrases);
	507
	508	if (isatty(STDIN_FILENO)) {
	509	int r;
	510	char s = NULL, *l = NULL;
	511
	512	if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
	513	return r;
	514
	515	l = strv_new(s, NULL);
	516	free(s);
	517
	518	if (!l)
	519	return -ENOMEM;
	520
	521	*_passphrases = l;
	522	return r;
260ab287	523
21bc923a LP	524	} else
21bc923a LP	525	return ask_password_agent(message, icon, until, accept_cached, _passphrases);
260ab287	526	}