[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 "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;
        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) {
                                p--;

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

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