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ask-password: add basic tty agent

This commit is contained in:
Lennart Poettering 2010-10-25 20:35:17 +02:00
parent f015eca2a2
commit ec863ba65a
10 changed files with 585 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
.gitignore vendored
View File

@ -1,3 +1,4 @@
systemd-tty-ask-password-agent
systemd-fsck
systemd-quotacheck
systemd-user-sessions
@ -6,7 +7,7 @@ systemd-tmpfiles
systemd-readahead-collect
systemd-readahead-replay
systemd-reply-password
systemd-ask-password-agent
systemd-gnome-ask-password-agent
systemd-ask-password
systemd-kmsg-syslogd
systemd-remount-api-vfs

10
Makefile.am
View File

@ -81,7 +81,8 @@ rootbin_PROGRAMS = \
systemd \
systemctl \
systemd-notify \
systemd-ask-password
systemd-ask-password \
systemd-tty-ask-password-agent
bin_PROGRAMS = \
systemd-cgls
@ -880,6 +881,13 @@ systemd_gnome_ask_password_agent_LDADD = \
$(DBUSGLIB_LIBS) \
$(GTK_LIBS)
systemd_tty_ask_password_agent_SOURCES = \
src/tty-ask-password-agent.c \
src/utmp-wtmp.c
systemd_tty_ask_password_agent_LDADD = \
libsystemd-basic.la
pam_systemd_la_SOURCES = \
src/pam-module.c \
src/cgroup-util.c \

2
src/.gitignore vendored
View File

@ -1,3 +1,3 @@
ask-password-agent.c
gnome-ask-password-agent.c
systemd-interfaces.c
systemadm.c

113
src/ask-password.c
View File

@ -62,9 +62,9 @@ static int create_socket(char **name) {
zero(sa);
sa.un.sun_family = AF_UNIX;
snprintf(sa.un.sun_path+1, sizeof(sa.un.sun_path)-1, "/org/freedesktop/systemd1/ask-password/%llu", random_ull());
snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/dev/.systemd/ask-password/sck.%llu", random_ull());
if (bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
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;
@ -76,7 +76,7 @@ static int create_socket(char **name) {
goto fail;
}
if (!(c = strdup(sa.un.sun_path+1))) {
if (!(c = strdup(sa.un.sun_path))) {
r = -ENOMEM;
log_error("Out of memory");
goto fail;
@ -97,7 +97,7 @@ static int help(void) {
"Query the user for a system passphrase, via the TTY or an UI agent.\n\n"
" -h --help Show this help\n"
" --icon=NAME Icon name\n"
" --timeout=USEC Timeout in usec\n"
" --timeout=SEC Timeout in sec\n"
" --no-tty Ask question via agent even on TTY\n",
program_invocation_short_name);
@ -176,6 +176,8 @@ static int ask_agent(void) {
sigset_t mask;
usec_t not_after;
mkdir_p("/dev/.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;
@ -211,8 +213,10 @@ static int ask_agent(void) {
fprintf(f,
"[Ask]\n"
"PID=%lu\n"
"Socket=%s\n"
"NotAfter=%llu\n",
(unsigned long) getpid(),
socket_name,
(unsigned long long) not_after);
@ -354,6 +358,11 @@ 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);
@ -368,89 +377,6 @@ finish:
return r;
}
static int ask_tty(void) {
struct termios old_termios, new_termios;
char passphrase[LINE_MAX];
FILE *ttyf;
if (!(ttyf = fopen("/dev/tty", "w"))) {
log_error("Failed to open /dev/tty: %m");
return -errno;
}
fputs("\x1B[1m", ttyf);
fprintf(ttyf, "%s: ", arg_message);
fputs("\x1B[0m", ttyf);
fflush(ttyf);
if (tcgetattr(STDIN_FILENO, &old_termios) >= 0) {
new_termios = old_termios;
new_termios.c_lflag &= ~(ICANON|ECHO);
new_termios.c_cc[VMIN] = 1;
new_termios.c_cc[VTIME] = 0;
if (tcsetattr(STDIN_FILENO, TCSADRAIN, &new_termios) >= 0) {
size_t p = 0;
int r = 0;
for (;;) {
size_t k;
char c;
k = fread(&c, 1, 1, stdin);
if (k <= 0) {
r = -EIO;
break;
}
if (c == '\n')
break;
else if (c == '\b' || c == 127) {
if (p > 0) {
p--;
fputs("\b \b", ttyf);
}
} else {
passphrase[p++] = c;
fputc('*', ttyf);
}
fflush(ttyf);
}
fputc('\n', ttyf);
fclose(ttyf);
tcsetattr(STDIN_FILENO, TCSADRAIN, &old_termios);
if (r < 0)
return -EIO;
passphrase[p] = 0;
fputs(passphrase, stdout);
fflush(stdout);
return 0;
}
}
fclose(ttyf);
if (!fgets(passphrase, sizeof(passphrase), stdin)) {
log_error("Failed to read password.");
return -EIO;
}
truncate_nl(passphrase);
fputs(passphrase, stdout);
fflush(stdout);
return 0;
}
int main(int argc, char *argv[]) {
int r;
@ -460,9 +386,16 @@ int main(int argc, char *argv[]) {
if ((r = parse_argv(argc, argv)) <= 0)
goto finish;
if (arg_use_tty && isatty(STDIN_FILENO))
r = ask_tty();
else
if (arg_use_tty && isatty(STDIN_FILENO)) {
char *password = NULL;
if ((r = ask_password_tty(arg_message, now(CLOCK_MONOTONIC) + arg_timeout, NULL, &password)) >= 0) {
fputs(password, stdout);
fflush(stdout);
free(password);
}
} else
r = ask_agent();
finish:

25
src/conf-parser.c
View File

@ -246,6 +246,31 @@ int config_parse_int(
return 0;
}
int config_parse_uint64(
const char *filename,
unsigned line,
const char *section,
const char *lvalue,
const char *rvalue,
void *data,
void *userdata) {
uint64_t *u = data;
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
assert(data);
if ((r = safe_atou64(rvalue, u)) < 0) {
log_error("[%s:%u] Failed to parse numeric value: %s", filename, line, rvalue);
return r;
}
return 0;
}
int config_parse_unsigned(
const char *filename,
unsigned line,

1
src/conf-parser.h
View File

@ -46,6 +46,7 @@ int config_parse(const char *filename, FILE *f, const char* const *sections, con
/* Generic parsers */
int config_parse_int(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
int config_parse_unsigned(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
int config_parse_uint64(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
int config_parse_size(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
int config_parse_bool(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);
int config_parse_string(const char *filename, unsigned line, const char *section, const char *lvalue, const char *rvalue, void *data, void *userdata);

4
src/reply-password.c
View File

@ -49,9 +49,9 @@ static int send_on_socket(int fd, const char *socket_name, const void *packet, s
zero(sa);
sa.un.sun_family = AF_UNIX;
strncpy(sa.un.sun_path+1, socket_name, sizeof(sa.un.sun_path)-1);
strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(socket_name)) < 0) {
if (sendto(fd, packet, size, MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0) {
log_error("Failed to send: %m");
return -1;
}

356
src/tty-ask-password-agent.c Normal file
View File

@ -0,0 +1,356 @@
/*-*- 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 <stdbool.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stddef.h>
#include <sys/poll.h>
#include <sys/inotify.h>
#include <unistd.h>
#include <getopt.h>
#include "util.h"
#include "conf-parser.h"
#include "utmp-wtmp.h"
static enum {
ACTION_LIST,
ACTION_QUERY,
ACTION_WATCH,
ACTION_WALL
} arg_action = ACTION_QUERY;
static int parse_password(const char *filename) {
char *socket_name = NULL, *message = NULL, *packet = NULL;
uint64_t not_after = 0;
unsigned pid = 0;
int socket_fd = -1;
const ConfigItem items[] = {
{ "Socket", config_parse_string, &socket_name, "Ask" },
{ "NotAfter", config_parse_uint64, &not_after, "Ask" },
{ "Message", config_parse_string, &message, "Ask" },
{ "PID", config_parse_unsigned, &pid, "Ask" },
};
FILE *f;
int r;
usec_t n;
assert(filename);
if (!(f = fopen(filename, "re"))) {
if (errno == ENOENT)
return 0;
log_error("open(%s): %m", filename);
return -errno;
}
if ((r = config_parse(filename, f, NULL, items, false, NULL)) < 0) {
log_error("Failed to parse password file %s: %s", filename, strerror(-r));
goto finish;
}
if (!socket_name || not_after <= 0) {
log_error("Invalid password file %s", filename);
r = -EBADMSG;
goto finish;
}
n = now(CLOCK_MONOTONIC);
if (n > not_after) {
r = 0;
goto finish;
}
if (arg_action == ACTION_LIST)
printf("'%s' (PID %u)\n", message, pid);
else if (arg_action == ACTION_WALL) {
char *wall;
if (asprintf(&wall,
"Password entry required for \'%s\' (PID %u).\r\n"
"Please enter password with the systemd-tty-password-agent tool!",
message,
pid) < 0) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
r = utmp_wall(wall);
free(wall);
} else {
union {
struct sockaddr sa;
struct sockaddr_un un;
} sa;
char *password;
assert(arg_action == ACTION_QUERY ||
arg_action == ACTION_WATCH);
if (access(socket_name, W_OK) < 0) {
if (arg_action == ACTION_QUERY)
log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid);
r = 0;
goto finish;
}
if ((r = ask_password_tty(message, not_after, filename, &password)) < 0) {
log_error("Failed to query passwords: %s", strerror(-r));
goto finish;
}
asprintf(&packet, "+%s", password);
free(password);
if (!packet) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
if ((socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
log_error("socket(): %m");
r = -errno;
goto finish;
}
zero(sa);
sa.un.sun_family = AF_UNIX;
strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
if (sendto(socket_fd, packet, strlen(packet), MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0) {
log_error("Failed to send: %m");
r = -errno;
goto finish;
}
}
finish:
fclose(f);
if (socket_fd >= 0)
close_nointr_nofail(socket_fd);
free(packet);
free(socket_name);
free(message);
return r;
}
static int show_passwords(void) {
DIR *d;
struct dirent *de;
int r = 0;
if (!(d = opendir("/dev/.systemd/ask-password"))) {
if (errno == ENOENT)
return 0;
log_error("opendir(): %m");
return -errno;
}
while ((de = readdir(d))) {
char *p;
int q;
if (de->d_type != DT_REG)
continue;
if (ignore_file(de->d_name))
continue;
if (!startswith(de->d_name, "ask."))
continue;
if (!(p = strappend("/dev/.systemd/ask-password/", de->d_name))) {
log_error("Out of memory");
r = -ENOMEM;
goto finish;
}
if ((q = parse_password(p)) < 0)
r = q;
free(p);
}
finish:
if (d)
closedir(d);
return r;
}
static int watch_passwords(void) {
int notify;
struct pollfd pollfd;
int r;
mkdir_p("/dev/.systemd/ask-password", 0755);
if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
r = -errno;
goto finish;
}
if (inotify_add_watch(notify, "/dev/.systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) {
r = -errno;
goto finish;
}
zero(pollfd);
pollfd.fd = notify;
pollfd.events = POLLIN;
for (;;) {
if ((r = show_passwords()) < 0)
break;
if (poll(&pollfd, 1, -1) < 0) {
if (errno == EINTR)
continue;
r = -errno;
goto finish;
}
if (pollfd.revents != 0)
flush_fd(notify);
}
r = 0;
finish:
if (notify >= 0)
close_nointr_nofail(notify);
return r;
}
static int help(void) {
printf("%s [OPTIONS...]\n\n"
"Process system password requests.\n\n"
" -h --help Show this help\n"
" --list Show pending password requests\n"
" --query Process pending password requests\n"
" --watch Continously process password requests\n"
" --wall Continously forward password requests to wall\n",
program_invocation_short_name);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_LIST = 0x100,
ARG_QUERY,
ARG_WATCH,
ARG_WALL,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "list", no_argument, NULL, ARG_LIST },
{ "query", no_argument, NULL, ARG_QUERY },
{ "watch", no_argument, NULL, ARG_WATCH },
{ "wall", no_argument, NULL, ARG_WALL },
{ NULL, 0, NULL, 0 }
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
switch (c) {
case 'h':
help();
return 0;
case ARG_LIST:
arg_action = ACTION_LIST;
break;
case ARG_QUERY:
arg_action = ACTION_QUERY;
break;
case ARG_WATCH:
arg_action = ACTION_WATCH;
break;
case ARG_WALL:
arg_action = ACTION_WALL;
break;
case '?':
return -EINVAL;
default:
log_error("Unknown option code %c", c);
return -EINVAL;
}
}
if (optind != argc) {
help();
return -EINVAL;
}
return 1;
}
int main(int argc, char *argv[]) {
int r;
log_parse_environment();
log_open();
if ((r = parse_argv(argc, argv)) <= 0)
goto finish;
if (arg_action == ACTION_WATCH ||
arg_action == ACTION_WALL)
r = watch_passwords();
else
r = show_passwords();
finish:
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}

164
src/util.c
View File

@ -3350,6 +3350,170 @@ int signal_from_string_try_harder(const char *s) {
return signo;
}
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)) < 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, ": ", 2, 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 = -ETIMEDOUT;
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 = -ETIMEDOUT;
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);
}
}
if (ttyfd >= 0)
loop_write(ttyfd, "\n", 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)
tcsetattr(ttyfd, TCSADRAIN, &old_termios);
close_nointr_nofail(ttyfd);
}
return r;
}
static const char *const ioprio_class_table[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",

2
src/util.h
View File

@ -364,6 +364,8 @@ bool null_or_empty(struct stat *st);
DIR *xopendirat(int dirfd, const char *name);
int ask_password_tty(const char *message, usec_t until, const char *flag_file, char **_passphrase);
#define NULSTR_FOREACH(i, l) \
for ((i) = (l); (i) && *(i); (i) = strchr((i), 0)+1)