+++ /dev/null
-/*-*- 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 Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 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
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-#include <stdbool.h>
-#include <termios.h>
-#include <unistd.h>
-#include <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 "formats-util.h"
-#include "mkdir.h"
-#include "strv.h"
-#include "random-util.h"
-#include "terminal-util.h"
-#include "signal-util.h"
-#include "ask-password-api.h"
-
-static void backspace_chars(int ttyfd, size_t p) {
-
- if (ttyfd < 0)
- return;
-
- while (p > 0) {
- p--;
-
- loop_write(ttyfd, "\b \b", 3, false);
- }
-}
-
-int ask_password_tty(
- const char *message,
- usec_t until,
- bool echo,
- const char *flag_file,
- char **_passphrase) {
-
- struct termios old_termios, new_termios;
- char passphrase[LINE_MAX], *x;
- size_t p = 0;
- int r;
- _cleanup_close_ int ttyfd = -1, notify = -1;
- struct pollfd pollfd[2];
- bool reset_tty = false;
- bool silent_mode = false;
- bool dirty = false;
- enum {
- POLL_TTY,
- POLL_INOTIFY
- };
-
- assert(message);
- assert(_passphrase);
-
- if (flag_file) {
- notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
- if (notify < 0) {
- r = -errno;
- goto finish;
- }
-
- if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
- r = -errno;
- goto finish;
- }
- }
-
- ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC);
- if (ttyfd >= 0) {
-
- if (tcgetattr(ttyfd, &old_termios) < 0) {
- r = -errno;
- goto finish;
- }
-
- loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
- loop_write(ttyfd, message, strlen(message), false);
- loop_write(ttyfd, " ", 1, false);
- loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, 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;
- }
-
- k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for);
- if (k < 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;
-
- n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1);
- if (n < 0) {
- if (errno == EINTR || errno == EAGAIN)
- continue;
-
- r = -errno;
- goto finish;
-
- } else if (n == 0)
- break;
-
- if (c == '\n')
- break;
- else if (c == 21) { /* C-u */
-
- if (!silent_mode)
- backspace_chars(ttyfd, p);
- p = 0;
-
- } else if (c == '\b' || c == 127) {
-
- if (p > 0) {
-
- if (!silent_mode)
- backspace_chars(ttyfd, 1);
-
- p--;
- } else if (!dirty && !silent_mode) {
-
- silent_mode = true;
-
- /* There are two ways to enter silent
- * mode. Either by pressing backspace
- * as first key (and only as first key),
- * or ... */
- if (ttyfd >= 0)
- loop_write(ttyfd, "(no echo) ", 10, false);
-
- } else if (ttyfd >= 0)
- loop_write(ttyfd, "\a", 1, false);
-
- } else if (c == '\t' && !silent_mode) {
-
- backspace_chars(ttyfd, p);
- silent_mode = true;
-
- /* ... or by pressing TAB at any time. */
-
- if (ttyfd >= 0)
- loop_write(ttyfd, "(no echo) ", 10, false);
- } else {
- if (p >= sizeof(passphrase)-1) {
- loop_write(ttyfd, "\a", 1, false);
- continue;
- }
-
- passphrase[p++] = c;
-
- if (!silent_mode && ttyfd >= 0)
- loop_write(ttyfd, echo ? &c : "*", 1, false);
-
- dirty = true;
- }
- }
-
- x = strndup(passphrase, p);
- if (!x) {
- r = -ENOMEM;
- goto finish;
- }
-
- *_passphrase = x;
- r = 0;
-
-finish:
- if (ttyfd >= 0 && reset_tty) {
- loop_write(ttyfd, "\n", 1, false);
- tcsetattr(ttyfd, TCSADRAIN, &old_termios);
- }
-
- return r;
-}
-
-static int create_socket(char **name) {
- int fd;
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa = {
- .un.sun_family = AF_UNIX,
- };
- int one = 1;
- int r = 0;
- char *c;
-
- assert(name);
-
- fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
- if (fd < 0)
- return log_error_errno(errno, "socket() failed: %m");
-
- snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64());
-
- RUN_WITH_UMASK(0177) {
- r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
- }
-
- if (r < 0) {
- r = -errno;
- log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
- goto fail;
- }
-
- if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
- r = -errno;
- log_error_errno(errno, "SO_PASSCRED failed: %m");
- goto fail;
- }
-
- c = strdup(sa.un.sun_path);
- if (!c) {
- r = log_oom();
- goto fail;
- }
-
- *name = c;
- return fd;
-
-fail:
- safe_close(fd);
-
- return r;
-}
-
-int ask_password_agent(
- const char *message,
- const char *icon,
- const char *id,
- usec_t until,
- bool echo,
- bool accept_cached,
- char ***_passphrases) {
-
- enum {
- FD_SOCKET,
- FD_SIGNAL,
- _FD_MAX
- };
-
- char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
- char final[sizeof(temp)] = "";
- _cleanup_fclose_ FILE *f = NULL;
- _cleanup_free_ char *socket_name = NULL;
- _cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1;
- sigset_t mask, oldmask;
- struct pollfd pollfd[_FD_MAX];
- int r;
-
- assert(_passphrases);
-
- assert_se(sigemptyset(&mask) >= 0);
- assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0);
- assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0);
-
- mkdir_p_label("/run/systemd/ask-password", 0755);
-
- fd = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
- if (fd < 0) {
- log_error_errno(errno, "Failed to create password file: %m");
- r = -errno;
- goto finish;
- }
-
- fchmod(fd, 0644);
-
- f = fdopen(fd, "w");
- if (!f) {
- log_error_errno(errno, "Failed to allocate FILE: %m");
- r = -errno;
- goto finish;
- }
-
- fd = -1;
-
- signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
- if (signal_fd < 0) {
- log_error_errno(errno, "signalfd(): %m");
- r = -errno;
- goto finish;
- }
-
- socket_fd = create_socket(&socket_name);
- if (socket_fd < 0) {
- r = socket_fd;
- goto finish;
- }
-
- fprintf(f,
- "[Ask]\n"
- "PID="PID_FMT"\n"
- "Socket=%s\n"
- "AcceptCached=%i\n"
- "Echo=%i\n"
- "NotAfter="USEC_FMT"\n",
- getpid(),
- socket_name,
- accept_cached ? 1 : 0,
- echo ? 1 : 0,
- until);
-
- if (message)
- fprintf(f, "Message=%s\n", message);
-
- if (icon)
- fprintf(f, "Icon=%s\n", icon);
-
- if (id)
- fprintf(f, "Id=%s\n", id);
-
- fflush(f);
-
- if (ferror(f)) {
- log_error_errno(errno, "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_errno(errno, "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 > 0 && until <= t) {
- log_notice("Timed out");
- r = -ETIME;
- goto finish;
- }
-
- k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1);
- if (k < 0) {
- if (errno == EINTR)
- continue;
-
- log_error_errno(errno, "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);
-
- n = recvmsg(socket_fd, &msghdr, 0);
- if (n < 0) {
- if (errno == EAGAIN ||
- errno == EINTR)
- continue;
-
- log_error_errno(errno, "recvmsg() failed: %m");
- r = -errno;
- goto finish;
- }
-
- cmsg_close_all(&msghdr);
-
- 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 (n == 1)
- l = strv_new("", NULL);
- else
- l = strv_parse_nulstr(passphrase+1, n-1);
- /* An empty message refers to the empty password */
-
- if (!l) {
- 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 (socket_name)
- unlink(socket_name);
-
- 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, const char *id,
- usec_t until, bool accept_cached, char ***_passphrases) {
- assert(message);
- assert(_passphrases);
-
- if (isatty(STDIN_FILENO)) {
- int r;
- char *s = NULL, **l = NULL;
-
- r = ask_password_tty(message, until, false, NULL, &s);
- if (r < 0)
- return r;
-
- r = strv_consume(&l, s);
- if (r < 0)
- return r;
-
- *_passphrases = l;
- return r;
- } else
- return ask_password_agent(message, icon, id, until, false, accept_cached, _passphrases);
-}
~ianmdlvl / elogind.git / blobdiff