3e21c85da3
Garbage value could have been used if there was an error creating the password file.
470 lines
13 KiB
C
470 lines
13 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 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 General Public License as published by
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the Free Software Foundation; either version 2 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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General Public License for more details.
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You should have received a copy of the GNU 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 <sys/socket.h>
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#include <sys/poll.h>
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#include <sys/types.h>
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#include <assert.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <sys/signalfd.h>
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#include <getopt.h>
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#include <termios.h>
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#include <limits.h>
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#include "log.h"
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#include "macro.h"
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#include "util.h"
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static const char *arg_icon = NULL;
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static const char *arg_message = NULL;
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static bool arg_use_tty = true;
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static usec_t arg_timeout = 60 * USEC_PER_SEC;
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static int create_socket(char **name) {
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int fd;
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union {
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struct sockaddr sa;
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struct sockaddr_un un;
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} sa;
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int one = 1, r;
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char *c;
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assert(name);
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if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
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log_error("socket() failed: %m");
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return -errno;
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}
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zero(sa);
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sa.un.sun_family = AF_UNIX;
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snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, "/org/freedesktop/systemd1/ask-password/%llu", random_ull());
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if (bind(fd, &sa.sa, sizeof(sa_family_t) + 1 + strlen(sa.un.sun_path+1)) < 0) {
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r = -errno;
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log_error("bind() failed: %m");
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goto fail;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
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r = -errno;
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log_error("SO_PASSCRED failed: %m");
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goto fail;
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}
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if (!(c = strdup(sa.un.sun_path+1))) {
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r = -ENOMEM;
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log_error("Out of memory");
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goto fail;
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}
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*name = c;
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return fd;
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fail:
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close_nointr_nofail(fd);
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return r;
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}
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static int help(void) {
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printf("%s [OPTIONS...] MESSAGE\n\n"
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"Query the user for a system passphrase, via the TTY or an UI agent.\n\n"
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" -h --help Show this help\n"
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" --icon=NAME Icon name\n"
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" --timeout=USEC Timeout in usec\n"
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" --no-tty Ask question via agent even on TTY\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_ICON = 0x100,
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ARG_TIMEOUT,
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ARG_NO_TTY
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "icon", required_argument, NULL, ARG_ICON },
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{ "timeout", required_argument, NULL, ARG_TIMEOUT },
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{ "no-tty", no_argument, NULL, ARG_NO_TTY },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_ICON:
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arg_icon = optarg;
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break;
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case ARG_TIMEOUT:
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if (parse_usec(optarg, &arg_timeout) < 0 || arg_timeout <= 0) {
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log_error("Failed to parse --timeout parameter %s", optarg);
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return -EINVAL;
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}
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break;
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case ARG_NO_TTY:
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arg_use_tty = false;
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break;
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case '?':
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return -EINVAL;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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if (optind != argc-1) {
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help();
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return -EINVAL;
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}
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arg_message = argv[optind];
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return 1;
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}
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static int ask_agent(void) {
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char temp[] = "/dev/.systemd/ask-password/tmp.XXXXXX";
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char final[sizeof(temp)] = "";
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int fd = -1, r;
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FILE *f = NULL;
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char *socket_name = NULL;
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int socket_fd = -1, signal_fd;
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sigset_t mask;
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usec_t not_after;
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if ((fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY)) < 0) {
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log_error("Failed to create password file: %m");
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r = -errno;
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goto finish;
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}
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fchmod(fd, 0644);
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if (!(f = fdopen(fd, "w"))) {
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log_error("Failed to allocate FILE: %m");
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r = -errno;
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goto finish;
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}
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fd = -1;
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assert_se(sigemptyset(&mask) == 0);
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sigset_add_many(&mask, SIGINT, SIGTERM, -1);
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assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
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if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
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log_error("signalfd(): %m");
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r = -errno;
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goto finish;
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}
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if ((socket_fd = create_socket(&socket_name)) < 0) {
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r = socket_fd;
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goto finish;
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}
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not_after = now(CLOCK_MONOTONIC) + arg_timeout;
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fprintf(f,
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"[Ask]\n"
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"Socket=%s\n"
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"NotAfter=%llu\n",
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socket_name,
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(unsigned long long) not_after);
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if (arg_message)
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fprintf(f, "Message=%s\n", arg_message);
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if (arg_icon)
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fprintf(f, "Icon=%s\n", arg_icon);
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fflush(f);
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if (ferror(f)) {
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log_error("Failed to write query file: %m");
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r = -errno;
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goto finish;
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}
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memcpy(final, temp, sizeof(temp));
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final[sizeof(final)-11] = 'a';
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final[sizeof(final)-10] = 's';
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final[sizeof(final)-9] = 'k';
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if (rename(temp, final) < 0) {
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log_error("Failed to rename query file: %m");
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r = -errno;
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goto finish;
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}
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for (;;) {
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enum {
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FD_SOCKET,
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FD_SIGNAL,
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_FD_MAX
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};
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char passphrase[LINE_MAX+1];
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struct msghdr msghdr;
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struct iovec iovec;
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struct ucred *ucred;
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union {
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struct cmsghdr cmsghdr;
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uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
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} control;
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ssize_t n;
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struct pollfd pollfd[_FD_MAX];
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int k;
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zero(pollfd);
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pollfd[FD_SOCKET].fd = socket_fd;
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pollfd[FD_SOCKET].events = POLLIN;
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pollfd[FD_SIGNAL].fd = signal_fd;
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pollfd[FD_SIGNAL].events = POLLIN;
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if ((k = poll(pollfd, 2, arg_timeout/USEC_PER_MSEC)) < 0) {
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if (errno == EINTR)
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continue;
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log_error("poll() failed: %m");
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r = -errno;
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goto finish;
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}
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if (k <= 0) {
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log_notice("Timed out");
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r = -ETIME;
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goto finish;
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}
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if (pollfd[FD_SIGNAL].revents & POLLIN)
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break;
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if (pollfd[FD_SOCKET].revents != POLLIN) {
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log_error("Unexpected poll() event.");
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r = -EIO;
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goto finish;
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}
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zero(iovec);
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iovec.iov_base = passphrase;
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iovec.iov_len = sizeof(passphrase)-1;
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zero(control);
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zero(msghdr);
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msghdr.msg_iov = &iovec;
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msghdr.msg_iovlen = 1;
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msghdr.msg_control = &control;
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msghdr.msg_controllen = sizeof(control);
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if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
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if (errno == EAGAIN ||
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errno == EINTR)
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continue;
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log_error("recvmsg() failed: %m");
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r = -errno;
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goto finish;
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}
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if (n <= 0) {
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log_error("Message too short");
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continue;
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}
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if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
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control.cmsghdr.cmsg_level != SOL_SOCKET ||
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control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
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control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
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log_warning("Received message without credentials. Ignoring.");
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continue;
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}
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ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
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if (ucred->uid != 0) {
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log_warning("Got request from unprivileged user. Ignoring.");
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continue;
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}
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if (passphrase[0] == '+') {
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passphrase[n] = 0;
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fputs(passphrase+1, stdout);
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fflush(stdout);
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} else if (passphrase[0] == '-') {
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r = -ECANCELED;
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goto finish;
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} else {
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log_error("Invalid packet");
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continue;
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}
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break;
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}
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r = 0;
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finish:
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if (fd >= 0)
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close_nointr_nofail(fd);
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if (socket_fd >= 0)
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close_nointr_nofail(socket_fd);
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if (f)
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fclose(f);
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unlink(temp);
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if (final[0])
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unlink(final);
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return r;
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}
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static int ask_tty(void) {
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struct termios old_termios, new_termios;
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char passphrase[LINE_MAX];
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FILE *ttyf;
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if (!(ttyf = fopen("/dev/tty", "w"))) {
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log_error("Failed to open /dev/tty: %m");
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return -errno;
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}
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fputs("\x1B[1m", ttyf);
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fprintf(ttyf, "%s: ", arg_message);
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fputs("\x1B[0m", ttyf);
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fflush(ttyf);
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if (tcgetattr(STDIN_FILENO, &old_termios) >= 0) {
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new_termios = old_termios;
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new_termios.c_lflag &= ~(ICANON|ECHO);
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new_termios.c_cc[VMIN] = 1;
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new_termios.c_cc[VTIME] = 0;
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if (tcsetattr(STDIN_FILENO, TCSADRAIN, &new_termios) >= 0) {
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size_t p = 0;
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int r = 0;
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for (;;) {
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size_t k;
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char c;
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k = fread(&c, 1, 1, stdin);
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if (k <= 0) {
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r = -EIO;
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break;
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}
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if (c == '\n')
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break;
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else if (c == '\b' || c == 127) {
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if (p > 0) {
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p--;
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fputs("\b \b", ttyf);
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}
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} else {
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passphrase[p++] = c;
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fputc('*', ttyf);
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}
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fflush(ttyf);
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}
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fputc('\n', ttyf);
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fclose(ttyf);
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tcsetattr(STDIN_FILENO, TCSADRAIN, &old_termios);
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if (r < 0)
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return -EIO;
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passphrase[p] = 0;
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fputs(passphrase, stdout);
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fflush(stdout);
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return 0;
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}
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}
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fclose(ttyf);
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if (!fgets(passphrase, sizeof(passphrase), stdin)) {
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log_error("Failed to read password.");
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return -EIO;
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}
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truncate_nl(passphrase);
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fputs(passphrase, stdout);
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fflush(stdout);
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return 0;
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}
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int main(int argc, char *argv[]) {
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int r;
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log_parse_environment();
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log_open();
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if ((r = parse_argv(argc, argv)) <= 0)
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goto finish;
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if (arg_use_tty && isatty(STDIN_FILENO))
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r = ask_tty();
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else
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r = ask_agent();
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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