| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <poll.h> |
| #include <stdbool.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/inotify.h> |
| #include <sys/signalfd.h> |
| #include <sys/stat.h> |
| #include <sys/time.h> |
| #include <sys/uio.h> |
| #include <sys/un.h> |
| #include <termios.h> |
| #include <unistd.h> |
| |
| #include "alloc-util.h" |
| #include "ask-password-api.h" |
| #include "def.h" |
| #include "fd-util.h" |
| #include "fileio.h" |
| #include "format-util.h" |
| #include "fs-util.h" |
| #include "io-util.h" |
| #include "locale-util.h" |
| #include "log.h" |
| #include "macro.h" |
| #include "memory-util.h" |
| #include "missing_syscall.h" |
| #include "mkdir.h" |
| #include "process-util.h" |
| #include "random-util.h" |
| #include "signal-util.h" |
| #include "socket-util.h" |
| #include "string-util.h" |
| #include "strv.h" |
| #include "terminal-util.h" |
| #include "time-util.h" |
| #include "tmpfile-util.h" |
| #include "umask-util.h" |
| #include "utf8.h" |
| |
| #define KEYRING_TIMEOUT_USEC ((5 * USEC_PER_MINUTE) / 2) |
| |
| static int lookup_key(const char *keyname, key_serial_t *ret) { |
| key_serial_t serial; |
| |
| assert(keyname); |
| assert(ret); |
| |
| serial = request_key("user", keyname, NULL, 0); |
| if (serial == -1) |
| return negative_errno(); |
| |
| *ret = serial; |
| return 0; |
| } |
| |
| static int retrieve_key(key_serial_t serial, char ***ret) { |
| size_t nfinal, m = 100; |
| char **l; |
| _cleanup_(erase_and_freep) char *pfinal = NULL; |
| |
| assert(ret); |
| |
| for (;;) { |
| _cleanup_(erase_and_freep) char *p = NULL; |
| long n; |
| |
| p = new(char, m); |
| if (!p) |
| return -ENOMEM; |
| |
| n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0); |
| if (n < 0) |
| return -errno; |
| if ((size_t) n <= m) { |
| nfinal = (size_t) n; |
| pfinal = TAKE_PTR(p); |
| break; |
| } |
| |
| if (m > LONG_MAX / 2) /* overflow check */ |
| return -ENOMEM; |
| m *= 2; |
| } |
| |
| l = strv_parse_nulstr(pfinal, nfinal); |
| if (!l) |
| return -ENOMEM; |
| |
| *ret = l; |
| return 0; |
| } |
| |
| static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) { |
| _cleanup_strv_free_erase_ char **l = NULL; |
| _cleanup_(erase_and_freep) char *p = NULL; |
| key_serial_t serial; |
| size_t n; |
| int r; |
| |
| assert(keyname); |
| |
| if (!(flags & ASK_PASSWORD_PUSH_CACHE)) |
| return 0; |
| if (strv_isempty(passwords)) |
| return 0; |
| |
| r = lookup_key(keyname, &serial); |
| if (r >= 0) { |
| r = retrieve_key(serial, &l); |
| if (r < 0) |
| return r; |
| } else if (r != -ENOKEY) |
| return r; |
| |
| r = strv_extend_strv(&l, passwords, true); |
| if (r <= 0) |
| return r; |
| |
| r = strv_make_nulstr(l, &p, &n); |
| if (r < 0) |
| return r; |
| |
| serial = add_key("user", keyname, p, n, KEY_SPEC_USER_KEYRING); |
| if (serial == -1) |
| return -errno; |
| |
| if (keyctl(KEYCTL_SET_TIMEOUT, |
| (unsigned long) serial, |
| (unsigned long) DIV_ROUND_UP(KEYRING_TIMEOUT_USEC, USEC_PER_SEC), 0, 0) < 0) |
| log_debug_errno(errno, "Failed to adjust kernel keyring key timeout: %m"); |
| |
| /* Tell everyone to check the keyring */ |
| (void) touch("/run/systemd/ask-password"); |
| |
| log_debug("Added key to kernel keyring as %" PRIi32 ".", serial); |
| |
| return 1; |
| } |
| |
| static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) { |
| int r; |
| |
| assert(keyname); |
| |
| r = add_to_keyring(keyname, flags, passwords); |
| if (r < 0) |
| return log_debug_errno(r, "Failed to add password to kernel keyring: %m"); |
| |
| return 0; |
| } |
| |
| static int ask_password_keyring(const char *keyname, AskPasswordFlags flags, char ***ret) { |
| |
| key_serial_t serial; |
| int r; |
| |
| assert(keyname); |
| assert(ret); |
| |
| if (!(flags & ASK_PASSWORD_ACCEPT_CACHED)) |
| return -EUNATCH; |
| |
| r = lookup_key(keyname, &serial); |
| if (ERRNO_IS_NOT_SUPPORTED(r) || r == -EPERM) /* when retrieving the distinction between "kernel or |
| * container manager don't support or allow this" and |
| * "no matching key known" doesn't matter. Note that we |
| * propagate EACCESS here (even if EPERM not) since |
| * that is used if the keyring is available but we lack |
| * access to the key. */ |
| return -ENOKEY; |
| if (r < 0) |
| return r; |
| |
| return retrieve_key(serial, ret); |
| } |
| |
| static int backspace_chars(int ttyfd, size_t p) { |
| if (ttyfd < 0) |
| return 0; |
| |
| _cleanup_free_ char *buf = malloc_multiply(3, p); |
| if (!buf) |
| return log_oom(); |
| |
| for (size_t i = 0; i < p; i++) |
| memcpy(buf + 3 * i, "\b \b", 3); |
| |
| return loop_write(ttyfd, buf, 3*p, false); |
| } |
| |
| static int backspace_string(int ttyfd, const char *str) { |
| assert(str); |
| |
| /* Backspaces through enough characters to entirely undo printing of the specified string. */ |
| |
| if (ttyfd < 0) |
| return 0; |
| |
| size_t m = utf8_n_codepoints(str); |
| if (m == (size_t) -1) |
| m = strlen(str); /* Not a valid UTF-8 string? If so, let's backspace the number of bytes |
| * output. Most likely this happened because we are not in an UTF-8 locale, |
| * and in that case that is the correct thing to do. And even if it's not, |
| * terminals tend to stop backspacing at the leftmost column, hence |
| * backspacing too much should be mostly OK. */ |
| |
| return backspace_chars(ttyfd, m); |
| } |
| |
| int ask_password_plymouth( |
| const char *message, |
| usec_t until, |
| AskPasswordFlags flags, |
| const char *flag_file, |
| char ***ret) { |
| |
| static const union sockaddr_union sa = PLYMOUTH_SOCKET; |
| _cleanup_close_ int fd = -1, notify = -1; |
| _cleanup_free_ char *packet = NULL; |
| ssize_t k; |
| int r, n; |
| struct pollfd pollfd[2] = {}; |
| char buffer[LINE_MAX]; |
| size_t p = 0; |
| enum { |
| POLL_SOCKET, |
| POLL_INOTIFY |
| }; |
| |
| assert(ret); |
| |
| if (!message) |
| message = "Password:"; |
| |
| if (flag_file) { |
| notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
| if (notify < 0) |
| return -errno; |
| |
| r = inotify_add_watch(notify, flag_file, IN_ATTRIB); /* for the link count */ |
| if (r < 0) |
| return -errno; |
| } |
| |
| fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
| if (fd < 0) |
| return -errno; |
| |
| r = connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)); |
| if (r < 0) |
| return -errno; |
| |
| if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
| packet = strdup("c"); |
| n = 1; |
| } else if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) |
| packet = NULL; |
| if (!packet) |
| return -ENOMEM; |
| |
| r = loop_write(fd, packet, n + 1, true); |
| if (r < 0) |
| return r; |
| |
| pollfd[POLL_SOCKET].fd = fd; |
| pollfd[POLL_SOCKET].events = POLLIN; |
| pollfd[POLL_INOTIFY].fd = notify; |
| pollfd[POLL_INOTIFY].events = POLLIN; |
| |
| for (;;) { |
| int sleep_for = -1, j; |
| |
| 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 && access(flag_file, F_OK) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| |
| j = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for); |
| if (j < 0) { |
| if (errno == EINTR) |
| continue; |
| |
| r = -errno; |
| goto finish; |
| } else if (j == 0) { |
| r = -ETIME; |
| goto finish; |
| } |
| |
| if (pollfd[POLL_SOCKET].revents & POLLNVAL || |
| (notify >= 0 && pollfd[POLL_INOTIFY].revents & POLLNVAL)) { |
| r = -EBADF; |
| goto finish; |
| } |
| |
| if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0) |
| (void) flush_fd(notify); |
| |
| if (pollfd[POLL_SOCKET].revents == 0) |
| continue; |
| |
| k = read(fd, buffer + p, sizeof(buffer) - p); |
| if (k < 0) { |
| if (IN_SET(errno, EINTR, EAGAIN)) |
| continue; |
| |
| r = -errno; |
| goto finish; |
| } else if (k == 0) { |
| r = -EIO; |
| goto finish; |
| } |
| |
| p += k; |
| |
| if (buffer[0] == 5) { |
| |
| if (flags & ASK_PASSWORD_ACCEPT_CACHED) { |
| /* Hmm, first try with cached |
| * passwords failed, so let's retry |
| * with a normal password request */ |
| packet = mfree(packet); |
| |
| if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| r = loop_write(fd, packet, n+1, true); |
| if (r < 0) |
| goto finish; |
| |
| flags &= ~ASK_PASSWORD_ACCEPT_CACHED; |
| p = 0; |
| continue; |
| } |
| |
| /* No password, because UI not shown */ |
| r = -ENOENT; |
| goto finish; |
| |
| } else if (IN_SET(buffer[0], 2, 9)) { |
| uint32_t size; |
| char **l; |
| |
| /* One or more answers */ |
| if (p < 5) |
| continue; |
| |
| memcpy(&size, buffer+1, sizeof(size)); |
| size = le32toh(size); |
| if (size + 5 > sizeof(buffer)) { |
| r = -EIO; |
| goto finish; |
| } |
| |
| if (p-5 < size) |
| continue; |
| |
| l = strv_parse_nulstr(buffer + 5, size); |
| if (!l) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| *ret = l; |
| break; |
| |
| } else { |
| /* Unknown packet */ |
| r = -EIO; |
| goto finish; |
| } |
| } |
| |
| r = 0; |
| |
| finish: |
| explicit_bzero_safe(buffer, sizeof(buffer)); |
| return r; |
| } |
| |
| #define NO_ECHO "(no echo) " |
| #define PRESS_TAB "(press TAB for no echo) " |
| #define SKIPPED "(skipped)" |
| |
| int ask_password_tty( |
| int ttyfd, |
| const char *message, |
| const char *keyname, |
| usec_t until, |
| AskPasswordFlags flags, |
| const char *flag_file, |
| char ***ret) { |
| |
| enum { |
| POLL_TTY, |
| POLL_INOTIFY, |
| _POLL_MAX, |
| }; |
| |
| bool reset_tty = false, dirty = false, use_color = false, press_tab_visible = false; |
| _cleanup_close_ int cttyfd = -1, notify = -1; |
| struct termios old_termios, new_termios; |
| char passphrase[LINE_MAX + 1] = {}, *x; |
| _cleanup_strv_free_erase_ char **l = NULL; |
| struct pollfd pollfd[_POLL_MAX]; |
| size_t p = 0, codepoint = 0; |
| int r; |
| |
| assert(ret); |
| |
| if (flags & ASK_PASSWORD_NO_TTY) |
| return -EUNATCH; |
| |
| if (!message) |
| message = "Password:"; |
| |
| if (emoji_enabled()) |
| message = strjoina(special_glyph(SPECIAL_GLYPH_LOCK_AND_KEY), " ", message); |
| |
| if (flag_file || ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname)) { |
| notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK); |
| if (notify < 0) |
| return -errno; |
| } |
| if (flag_file) { |
| if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) |
| return -errno; |
| } |
| if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) { |
| r = ask_password_keyring(keyname, flags, ret); |
| if (r >= 0) |
| return 0; |
| else if (r != -ENOKEY) |
| return r; |
| |
| if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */) < 0) |
| return -errno; |
| } |
| |
| /* If the caller didn't specify a TTY, then use the controlling tty, if we can. */ |
| if (ttyfd < 0) |
| ttyfd = cttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC); |
| |
| if (ttyfd >= 0) { |
| if (tcgetattr(ttyfd, &old_termios) < 0) |
| return -errno; |
| |
| if (flags & ASK_PASSWORD_CONSOLE_COLOR) |
| use_color = dev_console_colors_enabled(); |
| else |
| use_color = colors_enabled(); |
| |
| if (use_color) |
| (void) loop_write(ttyfd, ANSI_HIGHLIGHT, STRLEN(ANSI_HIGHLIGHT), false); |
| |
| (void) loop_write(ttyfd, message, strlen(message), false); |
| (void) loop_write(ttyfd, " ", 1, false); |
| |
| if (!(flags & ASK_PASSWORD_SILENT) && !(flags & ASK_PASSWORD_ECHO)) { |
| if (use_color) |
| (void) loop_write(ttyfd, ANSI_GREY, STRLEN(ANSI_GREY), false); |
| (void) loop_write(ttyfd, PRESS_TAB, strlen(PRESS_TAB), false); |
| press_tab_visible = true; |
| } |
| |
| if (use_color) |
| (void) loop_write(ttyfd, ANSI_NORMAL, STRLEN(ANSI_NORMAL), 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; |
| } |
| |
| pollfd[POLL_TTY] = (struct pollfd) { |
| .fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO, |
| .events = POLLIN, |
| }; |
| pollfd[POLL_INOTIFY] = (struct pollfd) { |
| .fd = notify, |
| .events = POLLIN, |
| }; |
| |
| for (;;) { |
| _cleanup_(erase_char) 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) DIV_ROUND_UP(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 ((pollfd[POLL_TTY].revents & POLLNVAL) || |
| (notify >= 0 && (pollfd[POLL_INOTIFY].revents & POLLNVAL))) { |
| r = -EBADF; |
| goto finish; |
| } |
| |
| if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0 && keyname) { |
| (void) flush_fd(notify); |
| |
| r = ask_password_keyring(keyname, flags, ret); |
| if (r >= 0) { |
| r = 0; |
| goto finish; |
| } else if (r != -ENOKEY) |
| goto finish; |
| } |
| |
| if (pollfd[POLL_TTY].revents == 0) |
| continue; |
| |
| n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1); |
| if (n < 0) { |
| if (IN_SET(errno, EINTR, EAGAIN)) |
| continue; |
| |
| r = -errno; |
| goto finish; |
| |
| } |
| |
| if (press_tab_visible) { |
| assert(ttyfd >= 0); |
| backspace_chars(ttyfd, strlen(PRESS_TAB)); |
| press_tab_visible = false; |
| } |
| |
| /* We treat EOF, newline and NUL byte all as valid end markers */ |
| if (n == 0 || c == '\n' || c == 0) |
| break; |
| |
| if (c == 4) { /* C-d also known as EOT */ |
| if (ttyfd >= 0) |
| (void) loop_write(ttyfd, SKIPPED, strlen(SKIPPED), false); |
| |
| goto skipped; |
| } |
| |
| if (c == 21) { /* C-u */ |
| |
| if (!(flags & ASK_PASSWORD_SILENT)) |
| (void) backspace_string(ttyfd, passphrase); |
| |
| explicit_bzero_safe(passphrase, sizeof(passphrase)); |
| p = codepoint = 0; |
| |
| } else if (IN_SET(c, '\b', 127)) { |
| |
| if (p > 0) { |
| size_t q; |
| |
| if (!(flags & ASK_PASSWORD_SILENT)) |
| (void) backspace_chars(ttyfd, 1); |
| |
| /* Remove a full UTF-8 codepoint from the end. For that, figure out where the |
| * last one begins */ |
| q = 0; |
| for (;;) { |
| size_t z; |
| |
| z = utf8_encoded_valid_unichar(passphrase + q, (size_t) -1); |
| if (z == 0) { |
| q = (size_t) -1; /* Invalid UTF8! */ |
| break; |
| } |
| |
| if (q + z >= p) /* This one brings us over the edge */ |
| break; |
| |
| q += z; |
| } |
| |
| p = codepoint = q == (size_t) -1 ? p - 1 : q; |
| explicit_bzero_safe(passphrase + p, sizeof(passphrase) - p); |
| |
| } else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) { |
| |
| flags |= ASK_PASSWORD_SILENT; |
| |
| /* There are two ways to enter silent mode. Either by pressing backspace as |
| * first key (and only as first key), or ... */ |
| |
| if (ttyfd >= 0) |
| (void) loop_write(ttyfd, NO_ECHO, strlen(NO_ECHO), false); |
| |
| } else if (ttyfd >= 0) |
| (void) loop_write(ttyfd, "\a", 1, false); |
| |
| } else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) { |
| |
| (void) backspace_string(ttyfd, passphrase); |
| flags |= ASK_PASSWORD_SILENT; |
| |
| /* ... or by pressing TAB at any time. */ |
| |
| if (ttyfd >= 0) |
| (void) loop_write(ttyfd, NO_ECHO, strlen(NO_ECHO), false); |
| |
| } else if (p >= sizeof(passphrase)-1) { |
| |
| /* Reached the size limit */ |
| if (ttyfd >= 0) |
| (void) loop_write(ttyfd, "\a", 1, false); |
| |
| } else { |
| passphrase[p++] = c; |
| |
| if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) { |
| /* Check if we got a complete UTF-8 character now. If so, let's output one '*'. */ |
| n = utf8_encoded_valid_unichar(passphrase + codepoint, (size_t) -1); |
| if (n >= 0) { |
| if (flags & ASK_PASSWORD_ECHO) |
| (void) loop_write(ttyfd, passphrase + codepoint, n, false); |
| else |
| (void) loop_write(ttyfd, "*", 1, false); |
| codepoint = p; |
| } |
| } |
| |
| dirty = true; |
| } |
| } |
| |
| x = strndup(passphrase, p); |
| explicit_bzero_safe(passphrase, sizeof(passphrase)); |
| if (!x) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| r = strv_consume(&l, x); |
| if (r < 0) |
| goto finish; |
| |
| skipped: |
| if (strv_isempty(l)) |
| r = log_debug_errno(SYNTHETIC_ERRNO(ECANCELED), "Password query was cancelled."); |
| else { |
| if (keyname) |
| (void) add_to_keyring_and_log(keyname, flags, l); |
| |
| *ret = TAKE_PTR(l); |
| r = 0; |
| } |
| |
| finish: |
| if (ttyfd >= 0 && reset_tty) { |
| (void) loop_write(ttyfd, "\n", 1, false); |
| (void) tcsetattr(ttyfd, TCSADRAIN, &old_termios); |
| } |
| |
| return r; |
| } |
| |
| static int create_socket(char **ret) { |
| _cleanup_free_ char *path = NULL; |
| union sockaddr_union sa; |
| socklen_t sa_len; |
| _cleanup_close_ int fd = -1; |
| int r; |
| |
| assert(ret); |
| |
| fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); |
| if (fd < 0) |
| return -errno; |
| |
| if (asprintf(&path, "/run/systemd/ask-password/sck.%" PRIx64, random_u64()) < 0) |
| return -ENOMEM; |
| |
| r = sockaddr_un_set_path(&sa.un, path); |
| if (r < 0) |
| return r; |
| sa_len = r; |
| |
| RUN_WITH_UMASK(0177) |
| if (bind(fd, &sa.sa, sa_len) < 0) |
| return -errno; |
| |
| r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true); |
| if (r < 0) |
| return r; |
| |
| *ret = TAKE_PTR(path); |
| return TAKE_FD(fd); |
| } |
| |
| int ask_password_agent( |
| const char *message, |
| const char *icon, |
| const char *id, |
| const char *keyname, |
| usec_t until, |
| AskPasswordFlags flags, |
| char ***ret) { |
| |
| enum { |
| FD_SOCKET, |
| FD_SIGNAL, |
| FD_INOTIFY, |
| _FD_MAX |
| }; |
| |
| _cleanup_close_ int socket_fd = -1, signal_fd = -1, notify = -1, fd = -1; |
| char temp[] = "/run/systemd/ask-password/tmp.XXXXXX"; |
| char final[sizeof(temp)] = ""; |
| _cleanup_free_ char *socket_name = NULL; |
| _cleanup_strv_free_erase_ char **l = NULL; |
| _cleanup_fclose_ FILE *f = NULL; |
| struct pollfd pollfd[_FD_MAX]; |
| sigset_t mask, oldmask; |
| int r; |
| |
| assert(ret); |
| |
| if (flags & ASK_PASSWORD_NO_AGENT) |
| return -EUNATCH; |
| |
| assert_se(sigemptyset(&mask) >= 0); |
| assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0); |
| assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0); |
| |
| (void) mkdir_p_label("/run/systemd/ask-password", 0755); |
| |
| if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) { |
| r = ask_password_keyring(keyname, flags, ret); |
| if (r >= 0) { |
| r = 0; |
| goto finish; |
| } else if (r != -ENOKEY) |
| goto finish; |
| |
| notify = inotify_init1(IN_CLOEXEC | IN_NONBLOCK); |
| if (notify < 0) { |
| r = -errno; |
| goto finish; |
| } |
| if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_ATTRIB /* for mtime */) < 0) { |
| r = -errno; |
| goto finish; |
| } |
| } |
| |
| fd = mkostemp_safe(temp); |
| if (fd < 0) { |
| r = fd; |
| goto finish; |
| } |
| |
| (void) fchmod(fd, 0644); |
| |
| f = take_fdopen(&fd, "w"); |
| if (!f) { |
| r = -errno; |
| goto finish; |
| } |
| |
| signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); |
| if (signal_fd < 0) { |
| 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_cached(), |
| socket_name, |
| (flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0, |
| (flags & ASK_PASSWORD_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); |
| |
| r = fflush_and_check(f); |
| if (r < 0) |
| 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) { |
| 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; |
| pollfd[FD_INOTIFY].fd = notify; |
| pollfd[FD_INOTIFY].events = POLLIN; |
| |
| for (;;) { |
| CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred))) control; |
| char passphrase[LINE_MAX+1]; |
| struct iovec iovec; |
| struct ucred *ucred; |
| ssize_t n; |
| int k; |
| usec_t t; |
| |
| t = now(CLOCK_MONOTONIC); |
| |
| if (until > 0 && until <= t) { |
| r = -ETIME; |
| goto finish; |
| } |
| |
| k = poll(pollfd, notify >= 0 ? _FD_MAX : _FD_MAX - 1, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1); |
| if (k < 0) { |
| if (errno == EINTR) |
| continue; |
| |
| r = -errno; |
| goto finish; |
| } |
| |
| if (k <= 0) { |
| r = -ETIME; |
| goto finish; |
| } |
| |
| if (pollfd[FD_SOCKET].revents & POLLNVAL || |
| pollfd[FD_SIGNAL].revents & POLLNVAL || |
| (notify >= 0 && pollfd[FD_INOTIFY].revents & POLLNVAL)) { |
| r = -EBADF; |
| goto finish; |
| } |
| |
| if (pollfd[FD_SIGNAL].revents & POLLIN) { |
| r = -EINTR; |
| goto finish; |
| } |
| |
| if (notify >= 0 && pollfd[FD_INOTIFY].revents != 0) { |
| (void) flush_fd(notify); |
| |
| r = ask_password_keyring(keyname, flags, ret); |
| if (r >= 0) { |
| r = 0; |
| goto finish; |
| } else if (r != -ENOKEY) |
| goto finish; |
| } |
| |
| if (pollfd[FD_SOCKET].revents == 0) |
| continue; |
| |
| if (pollfd[FD_SOCKET].revents != POLLIN) { |
| r = -EIO; |
| goto finish; |
| } |
| |
| iovec = IOVEC_MAKE(passphrase, sizeof(passphrase)); |
| |
| struct msghdr msghdr = { |
| .msg_iov = &iovec, |
| .msg_iovlen = 1, |
| .msg_control = &control, |
| .msg_controllen = sizeof(control), |
| }; |
| |
| n = recvmsg_safe(socket_fd, &msghdr, 0); |
| if (IN_SET(n, -EAGAIN, -EINTR)) |
| continue; |
| if (n < 0) { |
| r = (int) n; |
| goto finish; |
| } |
| |
| cmsg_close_all(&msghdr); |
| |
| if (n <= 0) { |
| log_debug("Message too short"); |
| continue; |
| } |
| |
| ucred = CMSG_FIND_DATA(&msghdr, SOL_SOCKET, SCM_CREDENTIALS, struct ucred); |
| if (!ucred) { |
| log_debug("Received message without credentials. Ignoring."); |
| continue; |
| } |
| |
| if (ucred->uid != 0) { |
| log_debug("Got request from unprivileged user. Ignoring."); |
| continue; |
| } |
| |
| if (passphrase[0] == '+') { |
| /* An empty message refers to the empty password */ |
| if (n == 1) |
| l = strv_new(""); |
| else |
| l = strv_parse_nulstr(passphrase+1, n-1); |
| explicit_bzero_safe(passphrase, n); |
| if (!l) { |
| r = -ENOMEM; |
| goto finish; |
| } |
| |
| if (strv_isempty(l)) { |
| l = strv_free(l); |
| log_debug("Invalid packet"); |
| continue; |
| } |
| |
| break; |
| } |
| |
| if (passphrase[0] == '-') { |
| r = -ECANCELED; |
| goto finish; |
| } |
| |
| log_debug("Invalid packet"); |
| } |
| |
| if (keyname) |
| (void) add_to_keyring_and_log(keyname, flags, l); |
| |
| *ret = TAKE_PTR(l); |
| r = 0; |
| |
| finish: |
| if (socket_name) |
| (void) unlink(socket_name); |
| |
| (void) unlink(temp); |
| |
| if (final[0]) |
| (void) 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, |
| const char *keyname, |
| usec_t until, |
| AskPasswordFlags flags, |
| char ***ret) { |
| |
| int r; |
| |
| assert(ret); |
| |
| if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && |
| keyname && |
| ((flags & ASK_PASSWORD_NO_TTY) || !isatty(STDIN_FILENO)) && |
| (flags & ASK_PASSWORD_NO_AGENT)) { |
| r = ask_password_keyring(keyname, flags, ret); |
| if (r != -ENOKEY) |
| return r; |
| } |
| |
| if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO)) |
| return ask_password_tty(-1, message, keyname, until, flags, NULL, ret); |
| |
| if (!(flags & ASK_PASSWORD_NO_AGENT)) |
| return ask_password_agent(message, icon, id, keyname, until, flags, ret); |
| |
| return -EUNATCH; |
| } |