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Diffstat (limited to 'src/shared/ask-password-api.c')
-rw-r--r--src/shared/ask-password-api.c410
1 files changed, 286 insertions, 124 deletions
diff --git a/src/shared/ask-password-api.c b/src/shared/ask-password-api.c
index 3941605cec..2597cfc648 100644
--- a/src/shared/ask-password-api.c
+++ b/src/shared/ask-password-api.c
@@ -1,5 +1,3 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
/***
This file is part of systemd.
@@ -18,27 +16,176 @@
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 <inttypes.h>
+#include <limits.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdbool.h>
#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/inotify.h>
#include <sys/signalfd.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <termios.h>
+#include <unistd.h>
-#include "util.h"
+#include "alloc-util.h"
+#include "ask-password-api.h"
+#include "fd-util.h"
+#include "fileio.h"
#include "formats-util.h"
+#include "io-util.h"
+#include "log.h"
+#include "macro.h"
+#include "missing.h"
#include "mkdir.h"
-#include "strv.h"
#include "random-util.h"
-#include "terminal-util.h"
#include "signal-util.h"
-#include "ask-password-api.h"
+#include "socket-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "terminal-util.h"
+#include "time-util.h"
+#include "umask-util.h"
+#include "utf8.h"
+#include "util.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) {
+ _cleanup_free_ char *p = NULL;
+ long m = 100, n;
+ char **l;
+
+ assert(ret);
+
+ for (;;) {
+ 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 (n < m)
+ break;
+
+ memory_erase(p, n);
+ free(p);
+ m *= 2;
+ }
+
+ l = strv_parse_nulstr(p, n);
+ if (!l)
+ return -ENOMEM;
+
+ memory_erase(p, n);
+
+ *ret = l;
+ return 0;
+}
+
+static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) {
+ _cleanup_strv_free_erase_ char **l = NULL;
+ _cleanup_free_ char *p = NULL;
+ key_serial_t serial;
+ size_t n;
+ int r;
+
+ assert(keyname);
+ assert(passwords);
+
+ if (!(flags & ASK_PASSWORD_PUSH_CACHE))
+ 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);
+ memory_erase(p, n);
+ 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 timeout: %m");
+
+ log_debug("Added key to keyring as %" PRIi32 ".", serial);
+
+ return 1;
+}
+
+static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) {
+ int r;
+
+ assert(keyname);
+ assert(passwords);
+
+ r = add_to_keyring(keyname, flags, passwords);
+ if (r < 0)
+ return log_debug_errno(r, "Failed to add password to keyring: %m");
+
+ return 0;
+}
+
+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 (r == -ENOSYS) /* when retrieving the distinction doesn't matter */
+ return -ENOKEY;
+ if (r < 0)
+ return r;
+
+ return retrieve_key(serial, ret);
+}
static void backspace_chars(int ttyfd, size_t p) {
@@ -54,27 +201,32 @@ static void backspace_chars(int ttyfd, size_t p) {
int ask_password_tty(
const char *message,
+ const char *keyname,
usec_t until,
- bool echo,
+ AskPasswordFlags flags,
const char *flag_file,
- char **_passphrase) {
+ char **ret) {
struct termios old_termios, new_termios;
- char passphrase[LINE_MAX], *x;
- size_t p = 0;
+ char passphrase[LINE_MAX + 1] = {}, *x;
+ size_t p = 0, codepoint = 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);
+ assert(ret);
+
+ if (flags & ASK_PASSWORD_NO_TTY)
+ return -EUNATCH;
+
+ if (!message)
+ message = "Password:";
if (flag_file) {
notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
@@ -97,10 +249,12 @@ int ask_password_tty(
goto finish;
}
- loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
+ if (colors_enabled())
+ loop_write(ttyfd, ANSI_HIGHLIGHT, strlen(ANSI_HIGHLIGHT), 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);
+ if (colors_enabled())
+ loop_write(ttyfd, ANSI_NORMAL, strlen(ANSI_NORMAL), false);
new_termios = old_termios;
new_termios.c_lflag &= ~(ICANON|ECHO);
@@ -145,7 +299,7 @@ int ask_password_tty(
goto finish;
}
- k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for);
+ k = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for);
if (k < 0) {
if (errno == EINTR)
continue;
@@ -157,7 +311,7 @@ int ask_password_tty(
goto finish;
}
- if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
+ if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0)
flush_fd(notify);
if (pollfd[POLL_TTY].revents == 0)
@@ -178,7 +332,7 @@ int ask_password_tty(
break;
else if (c == 21) { /* C-u */
- if (!silent_mode)
+ if (!(flags & ASK_PASSWORD_SILENT))
backspace_chars(ttyfd, p);
p = 0;
@@ -186,28 +340,28 @@ int ask_password_tty(
if (p > 0) {
- if (!silent_mode)
+ if (!(flags & ASK_PASSWORD_SILENT))
backspace_chars(ttyfd, 1);
p--;
- } else if (!dirty && !silent_mode) {
+ } else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) {
- silent_mode = true;
+ 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 ... */
+ * 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) {
+ } else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) {
backspace_chars(ttyfd, p);
- silent_mode = true;
+ flags |= ASK_PASSWORD_SILENT;
/* ... or by pressing TAB at any time. */
@@ -221,20 +375,31 @@ int ask_password_tty(
passphrase[p++] = c;
- if (!silent_mode && ttyfd >= 0)
- loop_write(ttyfd, echo ? &c : "*", 1, false);
+ if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) {
+ n = utf8_encoded_valid_unichar(passphrase + codepoint);
+ if (n >= 0) {
+ codepoint = p;
+ loop_write(ttyfd, (flags & ASK_PASSWORD_ECHO) ? &c : "*", 1, false);
+ }
+ }
dirty = true;
}
+
+ c = 'x';
}
x = strndup(passphrase, p);
+ memory_erase(passphrase, p);
if (!x) {
r = -ENOMEM;
goto finish;
}
- *_passphrase = x;
+ if (keyname)
+ (void) add_to_keyring_and_log(keyname, flags, STRV_MAKE(x));
+
+ *ret = x;
r = 0;
finish:
@@ -247,52 +412,38 @@ finish:
}
static int create_socket(char **name) {
- int fd;
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa = {
+ union sockaddr_union sa = {
.un.sun_family = AF_UNIX,
};
- int one = 1;
- int r = 0;
+ _cleanup_close_ int fd = -1;
+ static const int one = 1;
char *c;
+ int r;
assert(name);
fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
- return log_error_errno(errno, "socket() failed: %m");
+ return -errno;
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 (bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
+ return -errno;
}
- 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;
- }
+ if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
+ return -errno;
c = strdup(sa.un.sun_path);
- if (!c) {
- r = log_oom();
- goto fail;
- }
+ if (!c)
+ return -ENOMEM;
*name = c;
- return fd;
-fail:
- safe_close(fd);
+ r = fd;
+ fd = -1;
return r;
}
@@ -301,10 +452,10 @@ int ask_password_agent(
const char *message,
const char *icon,
const char *id,
+ const char *keyname,
usec_t until,
- bool echo,
- bool accept_cached,
- char ***_passphrases) {
+ AskPasswordFlags flags,
+ char ***ret) {
enum {
FD_SOCKET,
@@ -312,35 +463,37 @@ int ask_password_agent(
_FD_MAX
};
+ _cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1;
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;
+ _cleanup_strv_free_ char **l = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
struct pollfd pollfd[_FD_MAX];
+ sigset_t mask, oldmask;
int r;
- assert(_passphrases);
+ 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);
- mkdir_p_label("/run/systemd/ask-password", 0755);
+ (void) mkdir_p_label("/run/systemd/ask-password", 0755);
- fd = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
+ fd = mkostemp_safe(temp);
if (fd < 0) {
- log_error_errno(errno, "Failed to create password file: %m");
- r = -errno;
+ r = fd;
goto finish;
}
- fchmod(fd, 0644);
+ (void) fchmod(fd, 0644);
f = fdopen(fd, "w");
if (!f) {
- log_error_errno(errno, "Failed to allocate FILE: %m");
r = -errno;
goto finish;
}
@@ -349,7 +502,6 @@ int ask_password_agent(
signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
if (signal_fd < 0) {
- log_error_errno(errno, "signalfd(): %m");
r = -errno;
goto finish;
}
@@ -369,8 +521,8 @@ int ask_password_agent(
"NotAfter="USEC_FMT"\n",
getpid(),
socket_name,
- accept_cached ? 1 : 0,
- echo ? 1 : 0,
+ (flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0,
+ (flags & ASK_PASSWORD_ECHO) ? 1 : 0,
until);
if (message)
@@ -382,13 +534,9 @@ int ask_password_agent(
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;
+ r = fflush_and_check(f);
+ if (r < 0)
goto finish;
- }
memcpy(final, temp, sizeof(temp));
@@ -397,7 +545,6 @@ int ask_password_agent(
final[sizeof(final)-9] = 'k';
if (rename(temp, final) < 0) {
- log_error_errno(errno, "Failed to rename query file: %m");
r = -errno;
goto finish;
}
@@ -424,7 +571,6 @@ int ask_password_agent(
t = now(CLOCK_MONOTONIC);
if (until > 0 && until <= t) {
- log_notice("Timed out");
r = -ETIME;
goto finish;
}
@@ -434,13 +580,11 @@ int ask_password_agent(
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;
}
@@ -451,7 +595,6 @@ int ask_password_agent(
}
if (pollfd[FD_SOCKET].revents != POLLIN) {
- log_error("Unexpected poll() event.");
r = -EIO;
goto finish;
}
@@ -473,7 +616,6 @@ int ask_password_agent(
errno == EINTR)
continue;
- log_error_errno(errno, "recvmsg() failed: %m");
r = -errno;
goto finish;
}
@@ -481,7 +623,7 @@ int ask_password_agent(
cmsg_close_all(&msghdr);
if (n <= 0) {
- log_error("Message too short");
+ log_debug("Message too short");
continue;
}
@@ -489,84 +631,104 @@ int ask_password_agent(
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.");
+ log_debug("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.");
+ log_debug("Got request from unprivileged user. Ignoring.");
continue;
}
if (passphrase[0] == '+') {
- char **l;
-
+ /* An empty message refers to the empty password */
if (n == 1)
l = strv_new("", NULL);
else
l = strv_parse_nulstr(passphrase+1, n-1);
- /* An empty message refers to the empty password */
-
+ memory_erase(passphrase, n);
if (!l) {
r = -ENOMEM;
goto finish;
}
if (strv_length(l) <= 0) {
- strv_free(l);
- log_error("Invalid packet");
+ l = strv_free(l);
+ log_debug("Invalid packet");
continue;
}
- *_passphrases = l;
+ break;
+ }
- } else if (passphrase[0] == '-') {
+ if (passphrase[0] == '-') {
r = -ECANCELED;
goto finish;
- } else {
- log_error("Invalid packet");
- continue;
}
- break;
+ log_debug("Invalid packet");
}
+ if (keyname)
+ (void) add_to_keyring_and_log(keyname, flags, l);
+
+ *ret = l;
+ l = NULL;
r = 0;
finish:
if (socket_name)
- unlink(socket_name);
+ (void) unlink(socket_name);
- unlink(temp);
+ (void) unlink(temp);
if (final[0])
- unlink(final);
+ (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,
- usec_t until, bool accept_cached, char ***_passphrases) {
- assert(message);
- assert(_passphrases);
+int ask_password_auto(
+ const char *message,
+ const char *icon,
+ const char *id,
+ const char *keyname,
+ usec_t until,
+ AskPasswordFlags flags,
+ char ***ret) {
- if (isatty(STDIN_FILENO)) {
- int r;
- char *s = NULL, **l = NULL;
+ int r;
- r = ask_password_tty(message, until, false, NULL, &s);
- if (r < 0)
+ assert(ret);
+
+ if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) {
+ r = ask_password_keyring(keyname, flags, ret);
+ if (r != -ENOKEY)
return r;
+ }
- r = strv_consume(&l, s);
+ if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO)) {
+ char *s = NULL, **l = NULL;
+
+ r = ask_password_tty(message, keyname, until, flags, NULL, &s);
if (r < 0)
return r;
- *_passphrases = l;
- return r;
- } else
- return ask_password_agent(message, icon, id, until, false, accept_cached, _passphrases);
+ r = strv_push(&l, s);
+ if (r < 0) {
+ string_erase(s);
+ free(s);
+ return -ENOMEM;
+ }
+
+ *ret = l;
+ return 0;
+ }
+
+ if (!(flags & ASK_PASSWORD_NO_AGENT))
+ return ask_password_agent(message, icon, id, keyname, until, flags, ret);
+
+ return -EUNATCH;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-07-23 00:14:41 +0000