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- Committer: teddy at recompile
- Date: 2020-04-05 21:30:59 UTC
- Revision ID: teddy@recompile.se-20200405213059-fb2a61ckqynrmatk
Fix file descriptor leak in mandos-client
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
When the local network has Mandos servers announcing themselves using
real, globally reachable, IPv6 addresses (i.e. not link-local
addresses), but there is no router on the local network providing IPv6
RA (Router Advertisement) packets, the client cannot reach the server
by normal means, since the client only has a link-local IPv6 address,
and has no usable route to reach the server's global IPv6 address.
(This is not a common situation, and usually only happens when the
router itself reboots and runs a Mandos client, since it cannot then
give RA packets to itself.) The client code has a solution for
this, which consists of adding a temporary local route to reach the
address of the server during communication, and removing this
temporary route afterwards.
This solution with a temporary route works, but has a file descriptor
leak; it leaks one file descriptor for each addition and for each
removal of a route. If one server requiring an added route is present
on the network, but no servers gives a password, making the client
retry after the default ten seconds, and we furthermore assume a
default 1024 open files limit, the client runs out of file descriptors
after about 90 minutes, after which time the client process will be
useless and fail to retrieve any passwords, necessitating manual
password entry via the keyboard.
Fix this by eliminating the file descriptor leak in the client.
* plugins.d/mandos-client.c (add_delete_local_route): Do
close(devnull) also in parent process, also if fork() fails, and on
any failure in child process.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
56
57
#include <errno.h> /* errno */
57
58
#include <argp.h> /* struct argp_option, struct
58
59
argp_state, struct argp,
59
60
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
const char *argp_program_version = "mandos-client 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
84
85
typedef struct plugin{
86
char *name; /* can be NULL or any plugin name */
87
char **argv;
88
int argc;
89
char **environ;
90
int envc;
91
bool disabled;
92
93
/* Variables used for running processes*/
75
94
pid_t pid;
76
95
int fd;
77
96
char *buffer;
78
97
size_t buffer_size;
79
98
size_t buffer_length;
80
99
bool eof;
81
bool completed;
100
volatile sig_atomic_t completed;
82
101
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
91
102
struct plugin *next;
92
103
} plugin;
93
104
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
98
115
return p;
99
116
}
100
117
}
101
118
/* Create a new plugin */
102
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
108
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
new_plugin->argv[0] = name;
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
124
return NULL;
125
}
126
char *copy_name = NULL;
127
if(name != NULL){
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
135
return NULL;
136
}
137
}
138
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
143
144
do {
145
new_plugin->argv = malloc(sizeof(char *) * 2);
146
} while(new_plugin->argv == NULL and errno == EINTR);
147
if(new_plugin->argv == NULL){
148
int e = errno;
149
free(copy_name);
150
free(new_plugin);
151
errno = e;
152
return NULL;
153
}
154
new_plugin->argv[0] = copy_name;
114
155
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
free(new_plugin->argv);
164
free(new_plugin);
165
errno = e;
166
return NULL;
167
}
168
new_plugin->environ[0] = NULL;
169
118
170
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
120
172
return new_plugin;
121
173
}
122
174
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
132
}
133
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
static bool add_to_char_array(const char *new, char ***array,
178
int *len){
179
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
183
new_array = reallocarray(*array, (size_t)((*len) + 2),
184
sizeof(char *));
185
#else
186
if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
187
/* overflow */
188
new_array = NULL;
189
errno = ENOMEM;
190
} else {
191
new_array = realloc(*array, (size_t)((*len) + 2)
192
* sizeof(char *));
193
}
194
#endif
195
} while(new_array == NULL and errno == EINTR);
196
/* Malloc check */
197
if(new_array == NULL){
198
return false;
199
}
200
*array = new_array;
201
/* Make a copy of the new string */
202
char *copy;
203
do {
204
copy = strdup(new);
205
} while(copy == NULL and errno == EINTR);
206
if(copy == NULL){
207
return false;
208
}
209
/* Insert the copy */
210
(*array)[*len] = copy;
211
(*len)++;
212
/* Add a new terminating NULL pointer to the last element */
213
(*array)[*len] = NULL;
214
return true;
215
}
216
217
/* Add to a plugin's argument vector */
218
__attribute__((nonnull(2), warn_unused_result))
219
static bool add_argument(plugin *p, const char *arg){
220
if(p == NULL){
221
return false;
222
}
223
return add_to_char_array(arg, &(p->argv), &(p->argc));
224
}
225
226
/* Add to a plugin's environment */
227
__attribute__((nonnull(2), warn_unused_result))
228
static bool add_environment(plugin *p, const char *def, bool replace){
229
if(p == NULL){
230
return false;
231
}
232
/* namelen = length of name of environment variable */
233
size_t namelen = (size_t)(strchrnul(def, '=') - def);
234
/* Search for this environment variable */
235
for(char **envdef = p->environ; *envdef != NULL; envdef++){
236
if(strncmp(*envdef, def, namelen + 1) == 0){
237
/* It already exists */
238
if(replace){
239
char *new_envdef;
240
do {
241
new_envdef = realloc(*envdef, strlen(def) + 1);
242
} while(new_envdef == NULL and errno == EINTR);
243
if(new_envdef == NULL){
244
return false;
245
}
246
*envdef = new_envdef;
247
strcpy(*envdef, def);
248
}
249
return true;
250
}
251
}
252
return add_to_char_array(def, &(p->environ), &(p->envc));
253
}
254
255
#ifndef O_CLOEXEC
134
256
/*
135
257
* Based on the example in the GNU LibC manual chapter 13.13 "File
136
258
* Descriptor Flags".
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
138
260
*/
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
261
__attribute__((warn_unused_result))
262
static int set_cloexec_flag(int fd){
263
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
142
264
/* If reading the flags failed, return error indication now. */
143
265
if(ret < 0){
144
266
return ret;
145
267
}
146
268
/* Store modified flag word in the descriptor. */
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
148
271
}
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
272
#endif /* not O_CLOEXEC */
273
274
275
/* Mark processes as completed when they exit, and save their exit
153
276
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
277
static void handle_sigchld(__attribute__((unused)) int sig){
278
int old_errno = errno;
279
while(true){
280
plugin *proc = plugin_list;
281
int status;
282
pid_t pid = waitpid(-1, &status, WNOHANG);
283
if(pid == 0){
284
/* Only still running child processes */
285
break;
286
}
287
if(pid == -1){
288
if(errno == ECHILD){
289
/* No child processes */
290
break;
291
}
292
error(0, errno, "waitpid");
293
}
294
295
/* A child exited, find it in process_list */
296
while(proc != NULL and proc->pid != pid){
297
proc = proc->next;
298
}
299
if(proc == NULL){
300
/* Process not found in process list */
301
continue;
302
}
303
proc->status = status;
304
proc->completed = 1;
305
}
306
errno = old_errno;
171
307
}
172
308
173
bool print_out_password(const char *buffer, size_t length){
174
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
309
/* Prints out a password to stdout */
310
__attribute__((nonnull, warn_unused_result))
311
static bool print_out_password(const char *buffer, size_t length){
312
ssize_t ret;
313
for(size_t written = 0; written < length; written += (size_t)ret){
176
314
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
177
315
length - written));
178
316
if(ret < 0){
182
320
return true;
183
321
}
184
322
323
/* Removes and free a plugin from the plugin list */
324
__attribute__((nonnull))
325
static void free_plugin(plugin *plugin_node){
326
327
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
328
free(*arg);
329
}
330
free(plugin_node->name);
331
free(plugin_node->argv);
332
for(char **env = plugin_node->environ; *env != NULL; env++){
333
free(*env);
334
}
335
free(plugin_node->environ);
336
free(plugin_node->buffer);
337
338
/* Removes the plugin from the singly-linked list */
339
if(plugin_node == plugin_list){
340
/* First one - simple */
341
plugin_list = plugin_list->next;
342
} else {
343
/* Second one or later */
344
for(plugin *p = plugin_list; p != NULL; p = p->next){
345
if(p->next == plugin_node){
346
p->next = plugin_node->next;
347
break;
348
}
349
}
350
}
351
352
free(plugin_node);
353
}
354
355
static void free_plugin_list(void){
356
while(plugin_list != NULL){
357
free_plugin(plugin_list);
358
}
359
}
360
185
361
int main(int argc, char *argv[]){
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
187
size_t d_name_len;
188
DIR *dir = NULL;
189
struct dirent *dirst;
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
char *argfile = NULL;
365
FILE *conffp;
366
struct dirent **direntries = NULL;
190
367
struct stat st;
191
368
fd_set rfds_all;
192
369
int ret, maxfd = 0;
370
ssize_t sret;
193
371
uid_t uid = 65534;
194
372
gid_t gid = 65534;
195
373
bool debug = false;
197
375
struct sigaction old_sigchld_action;
198
376
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
199
377
.sa_flags = SA_NOCLDSTOP };
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
378
char **custom_argv = NULL;
379
int custom_argc = 0;
380
int dir_fd = -1;
202
381
203
382
/* Establish a signal handler */
204
383
sigemptyset(&sigchld_action.sa_mask);
205
384
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
206
if(ret < 0){
207
perror("sigaddset");
208
exit(EXIT_FAILURE);
385
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
388
goto fallback;
209
389
}
210
390
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
211
if(ret < 0){
212
perror("sigaction");
213
exit(EXIT_FAILURE);
391
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
394
goto fallback;
214
395
}
215
396
216
397
/* The options we understand. */
218
399
{ .name = "global-options", .key = 'g',
219
400
.arg = "OPTION[,OPTION[,...]]",
220
401
.doc = "Options passed to all plugins" },
402
{ .name = "global-env", .key = 'G',
403
.arg = "VAR=value",
404
.doc = "Environment variable passed to all plugins" },
221
405
{ .name = "options-for", .key = 'o',
222
406
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
223
407
.doc = "Options passed only to specified plugin" },
408
{ .name = "env-for", .key = 'E',
409
.arg = "PLUGIN:ENV=value",
410
.doc = "Environment variable passed to specified plugin" },
224
411
{ .name = "disable", .key = 'd',
225
412
.arg = "PLUGIN",
226
413
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
227
417
{ .name = "plugin-dir", .key = 128,
228
418
.arg = "DIRECTORY",
229
419
.doc = "Specify a different plugin directory", .group = 2 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
420
{ .name = "config-file", .key = 129,
421
.arg = "FILE",
422
.doc = "Specify a different configuration file", .group = 2 },
423
{ .name = "userid", .key = 130,
424
.arg = "ID", .flags = 0,
425
.doc = "User ID the plugins will run as", .group = 3 },
426
{ .name = "groupid", .key = 131,
427
.arg = "ID", .flags = 0,
428
.doc = "Group ID the plugins will run as", .group = 3 },
429
{ .name = "debug", .key = 132,
430
.doc = "Debug mode", .group = 4 },
431
{ .name = "plugin-helper-dir", .key = 133,
432
.arg = "DIRECTORY",
433
.doc = "Specify a different plugin helper directory",
434
.group = 2 },
435
/*
436
* These reproduce what we would get without ARGP_NO_HELP
437
*/
438
{ .name = "help", .key = '?',
439
.doc = "Give this help list", .group = -1 },
440
{ .name = "usage", .key = -3,
441
.doc = "Give a short usage message", .group = -1 },
442
{ .name = "version", .key = 'V',
443
.doc = "Print program version", .group = -1 },
238
444
{ .name = NULL }
239
445
};
240
446
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
242
/* Get the INPUT argument from `argp_parse', which we know is a
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
245
switch (key) {
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
277
uid = (uid_t)strtol(arg, NULL, 10);
278
break;
279
case 130:
280
gid = (gid_t)strtol(arg, NULL, 10);
281
break;
282
case 131:
447
__attribute__((nonnull(3)))
448
error_t parse_opt(int key, char *arg, struct argp_state *state){
449
errno = 0;
450
switch(key){
451
char *tmp;
452
intmax_t tmp_id;
453
case 'g': /* --global-options */
454
{
455
char *plugin_option;
456
while((plugin_option = strsep(&arg, ",")) != NULL){
457
if(not add_argument(getplugin(NULL), plugin_option)){
458
break;
459
}
460
}
461
errno = 0;
462
}
463
break;
464
case 'G': /* --global-env */
465
if(add_environment(getplugin(NULL), arg, true)){
466
errno = 0;
467
}
468
break;
469
case 'o': /* --options-for */
470
{
471
char *option_list = strchr(arg, ':');
472
if(option_list == NULL){
473
argp_error(state, "No colon in \"%s\"", arg);
474
errno = EINVAL;
475
break;
476
}
477
*option_list = '\0';
478
option_list++;
479
if(arg[0] == '\0'){
480
argp_error(state, "Empty plugin name");
481
errno = EINVAL;
482
break;
483
}
484
char *option;
485
while((option = strsep(&option_list, ",")) != NULL){
486
if(not add_argument(getplugin(arg), option)){
487
break;
488
}
489
}
490
errno = 0;
491
}
492
break;
493
case 'E': /* --env-for */
494
{
495
char *envdef = strchr(arg, ':');
496
if(envdef == NULL){
497
argp_error(state, "No colon in \"%s\"", arg);
498
errno = EINVAL;
499
break;
500
}
501
*envdef = '\0';
502
envdef++;
503
if(arg[0] == '\0'){
504
argp_error(state, "Empty plugin name");
505
errno = EINVAL;
506
break;
507
}
508
if(add_environment(getplugin(arg), envdef, true)){
509
errno = 0;
510
}
511
}
512
break;
513
case 'd': /* --disable */
514
{
515
plugin *p = getplugin(arg);
516
if(p != NULL){
517
p->disabled = true;
518
errno = 0;
519
}
520
}
521
break;
522
case 'e': /* --enable */
523
{
524
plugin *p = getplugin(arg);
525
if(p != NULL){
526
p->disabled = false;
527
errno = 0;
528
}
529
}
530
break;
531
case 128: /* --plugin-dir */
532
free(plugindir);
533
plugindir = strdup(arg);
534
if(plugindir != NULL){
535
errno = 0;
536
}
537
break;
538
case 129: /* --config-file */
539
/* This is already done by parse_opt_config_file() */
540
break;
541
case 130: /* --userid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (uid_t)tmp_id){
545
argp_error(state, "Bad user ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)uid);
547
break;
548
}
549
uid = (uid_t)tmp_id;
550
errno = 0;
551
break;
552
case 131: /* --groupid */
553
tmp_id = strtoimax(arg, &tmp, 10);
554
if(errno != 0 or tmp == arg or *tmp != '\0'
555
or tmp_id != (gid_t)tmp_id){
556
argp_error(state, "Bad group ID number: \"%s\", using %"
557
PRIdMAX, arg, (intmax_t)gid);
558
break;
559
}
560
gid = (gid_t)tmp_id;
561
errno = 0;
562
break;
563
case 132: /* --debug */
283
564
debug = true;
284
565
break;
285
case ARGP_KEY_ARG:
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
288
}
289
plus_options = arg;
290
break;
291
case ARGP_KEY_END:
292
break;
293
default:
294
return ARGP_ERR_UNKNOWN;
295
}
296
return 0;
297
}
298
299
plugin *plugin_list = NULL;
300
301
struct argp argp = { .options = options, .parser = parse_opt,
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
566
case 133: /* --plugin-helper-dir */
567
free(pluginhelperdir);
568
pluginhelperdir = strdup(arg);
569
if(pluginhelperdir != NULL){
570
errno = 0;
571
}
572
break;
573
/*
574
* These reproduce what we would get without ARGP_NO_HELP
575
*/
576
case '?': /* --help */
577
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
578
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
579
__builtin_unreachable();
580
case -3: /* --usage */
581
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
582
argp_state_help(state, state->out_stream,
583
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
584
__builtin_unreachable();
585
case 'V': /* --version */
586
fprintf(state->out_stream, "%s\n", argp_program_version);
587
exit(EXIT_SUCCESS);
588
break;
589
/*
590
* When adding more options before this line, remember to also add a
591
* "case" to the "parse_opt_config_file" function below.
592
*/
593
case ARGP_KEY_ARG:
594
/* Cryptsetup always passes an argument, which is an empty
595
string if "none" was specified in /etc/crypttab. So if
596
argument was empty, we ignore it silently. */
597
if(arg[0] == '\0'){
598
break;
599
}
600
#if __GNUC__ >= 7
601
__attribute__((fallthrough));
602
#else
603
/* FALLTHROUGH */
604
#endif
605
default:
606
return ARGP_ERR_UNKNOWN;
607
}
608
return errno; /* Set to 0 at start */
609
}
610
611
/* This option parser is the same as parse_opt() above, except it
612
ignores everything but the --config-file option. */
613
error_t parse_opt_config_file(int key, char *arg,
614
__attribute__((unused))
615
struct argp_state *state){
616
errno = 0;
617
switch(key){
618
case 'g': /* --global-options */
619
case 'G': /* --global-env */
620
case 'o': /* --options-for */
621
case 'E': /* --env-for */
622
case 'd': /* --disable */
623
case 'e': /* --enable */
624
case 128: /* --plugin-dir */
625
break;
626
case 129: /* --config-file */
627
free(argfile);
628
argfile = strdup(arg);
629
if(argfile != NULL){
630
errno = 0;
631
}
632
break;
633
case 130: /* --userid */
634
case 131: /* --groupid */
635
case 132: /* --debug */
636
case 133: /* --plugin-helper-dir */
637
case '?': /* --help */
638
case -3: /* --usage */
639
case 'V': /* --version */
640
case ARGP_KEY_ARG:
641
break;
642
default:
643
return ARGP_ERR_UNKNOWN;
644
}
645
return errno;
646
}
647
648
struct argp argp = { .options = options,
649
.parser = parse_opt_config_file,
650
.args_doc = "",
303
651
.doc = "Mandos plugin runner -- Run plugins" };
304
652
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
306
if (ret == ARGP_ERR_UNKNOWN){
307
fprintf(stderr, "Unkown error while parsing arguments\n");
308
exitstatus = EXIT_FAILURE;
309
goto end;
310
}
311
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
322
perror("malloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
343
if (ret == ARGP_ERR_UNKNOWN){
344
fprintf(stderr, "Unkown error while parsing arguments\n");
345
exitstatus = EXIT_FAILURE;
346
goto end;
653
/* Parse using parse_opt_config_file() in order to get the custom
654
config file location, if any. */
655
ret = argp_parse(&argp, argc, argv,
656
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
657
NULL, NULL);
658
switch(ret){
659
case 0:
660
break;
661
case ENOMEM:
662
default:
663
errno = ret;
664
error(0, errno, "argp_parse");
665
exitstatus = EX_OSERR;
666
goto fallback;
667
case EINVAL:
668
exitstatus = EX_USAGE;
669
goto fallback;
670
}
671
672
/* Reset to the normal argument parser */
673
argp.parser = parse_opt;
674
675
/* Open the configfile if available */
676
if(argfile == NULL){
677
conffp = fopen(AFILE, "r");
678
} else {
679
conffp = fopen(argfile, "r");
680
}
681
if(conffp != NULL){
682
char *org_line = NULL;
683
char *p, *arg, *new_arg, *line;
684
size_t size = 0;
685
const char whitespace_delims[] = " \r\t\f\v\n";
686
const char comment_delim[] = "#";
687
688
custom_argc = 1;
689
custom_argv = malloc(sizeof(char*) * 2);
690
if(custom_argv == NULL){
691
error(0, errno, "malloc");
692
exitstatus = EX_OSERR;
693
goto fallback;
694
}
695
custom_argv[0] = argv[0];
696
custom_argv[1] = NULL;
697
698
/* for each line in the config file, strip whitespace and ignore
699
commented text */
700
while(true){
701
sret = getline(&org_line, &size, conffp);
702
if(sret == -1){
703
break;
704
}
705
706
line = org_line;
707
arg = strsep(&line, comment_delim);
708
while((p = strsep(&arg, whitespace_delims)) != NULL){
709
if(p[0] == '\0'){
710
continue;
711
}
712
new_arg = strdup(p);
713
if(new_arg == NULL){
714
error(0, errno, "strdup");
715
exitstatus = EX_OSERR;
716
free(org_line);
717
goto fallback;
718
}
719
720
custom_argc += 1;
721
{
722
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
723
char **new_argv = reallocarray(custom_argv, (size_t)custom_argc + 1,
724
sizeof(char *));
725
#else
726
char **new_argv = NULL;
727
if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
728
/* overflow */
729
errno = ENOMEM;
730
} else {
731
new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
732
* sizeof(char *));
733
}
734
#endif
735
if(new_argv == NULL){
736
error(0, errno, "reallocarray");
737
exitstatus = EX_OSERR;
738
free(new_arg);
739
free(org_line);
740
goto fallback;
741
} else {
742
custom_argv = new_argv;
743
}
744
}
745
custom_argv[custom_argc-1] = new_arg;
746
custom_argv[custom_argc] = NULL;
747
}
748
}
749
do {
750
ret = fclose(conffp);
751
} while(ret == EOF and errno == EINTR);
752
if(ret == EOF){
753
error(0, errno, "fclose");
754
exitstatus = EX_IOERR;
755
goto fallback;
756
}
757
free(org_line);
758
} else {
759
/* Check for harmful errors and go to fallback. Other errors might
760
not affect opening plugins */
761
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
762
error(0, errno, "fopen");
763
exitstatus = EX_OSERR;
764
goto fallback;
765
}
766
}
767
/* If there were any arguments from the configuration file, pass
768
them to parser as command line arguments */
769
if(custom_argv != NULL){
770
ret = argp_parse(&argp, custom_argc, custom_argv,
771
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
772
NULL, NULL);
773
switch(ret){
774
case 0:
775
break;
776
case ENOMEM:
777
default:
778
errno = ret;
779
error(0, errno, "argp_parse");
780
exitstatus = EX_OSERR;
781
goto fallback;
782
case EINVAL:
783
exitstatus = EX_CONFIG;
784
goto fallback;
785
}
786
}
787
788
/* Parse actual command line arguments, to let them override the
789
config file */
790
ret = argp_parse(&argp, argc, argv,
791
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
792
NULL, NULL);
793
switch(ret){
794
case 0:
795
break;
796
case ENOMEM:
797
default:
798
errno = ret;
799
error(0, errno, "argp_parse");
800
exitstatus = EX_OSERR;
801
goto fallback;
802
case EINVAL:
803
exitstatus = EX_USAGE;
804
goto fallback;
805
}
806
807
{
808
char *pluginhelperenv;
809
bool bret = true;
810
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
811
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
812
if(ret != -1){
813
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
814
}
815
if(ret == -1 or not bret){
816
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
817
" environment variable to \"%s\" for all plugins\n",
818
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
819
}
820
if(ret != -1){
821
free(pluginhelperenv);
347
822
}
348
823
}
349
824
350
825
if(debug){
351
for(plugin *p = plugin_list; p != NULL; p=p->next){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
352
827
fprintf(stderr, "Plugin: %s has %d arguments\n",
353
828
p->name ? p->name : "Global", p->argc - 1);
354
829
for(char **a = p->argv; *a != NULL; a++){
355
830
fprintf(stderr, "\tArg: %s\n", *a);
356
831
}
357
}
358
}
359
832
fprintf(stderr, "...and %d environment variables\n", p->envc);
833
for(char **a = p->environ; *a != NULL; a++){
834
fprintf(stderr, "\t%s\n", *a);
835
}
836
}
837
}
838
839
if(getuid() == 0){
840
/* Work around Debian bug #633582:
841
<https://bugs.debian.org/633582> */
842
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
843
if(plugindir_fd == -1){
844
if(errno != ENOENT){
845
error(0, errno, "open(\"" PDIR "\")");
846
}
847
} else {
848
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
849
if(ret == -1){
850
error(0, errno, "fstat");
851
} else {
852
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
853
ret = fchown(plugindir_fd, uid, gid);
854
if(ret == -1){
855
error(0, errno, "fchown");
856
}
857
}
858
}
859
close(plugindir_fd);
860
}
861
}
862
863
/* Lower permissions */
864
ret = setgid(gid);
865
if(ret == -1){
866
error(0, errno, "setgid");
867
}
360
868
ret = setuid(uid);
361
if (ret == -1){
362
perror("setuid");
363
}
364
365
setgid(gid);
366
if (ret == -1){
367
perror("setgid");
368
}
369
370
dir = opendir(plugindir);
371
if(dir == NULL){
372
perror("Could not open plugin dir");
373
exitstatus = EXIT_FAILURE;
374
goto end;
375
}
376
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
378
874
{
379
int dir_fd = dirfd(dir);
380
if(dir_fd >= 0){
381
ret = set_cloexec_flag(dir_fd);
382
if(ret < 0){
383
perror("set_cloexec_flag");
384
exitstatus = EXIT_FAILURE;
385
goto end;
875
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
876
#ifdef O_CLOEXEC
877
O_CLOEXEC
878
#else /* not O_CLOEXEC */
879
0
880
#endif /* not O_CLOEXEC */
881
);
882
if(dir_fd == -1){
883
error(0, errno, "Could not open plugin dir");
884
exitstatus = EX_UNAVAILABLE;
885
goto fallback;
886
}
887
888
#ifndef O_CLOEXEC
889
/* Set the FD_CLOEXEC flag on the directory */
890
ret = set_cloexec_flag(dir_fd);
891
if(ret < 0){
892
error(0, errno, "set_cloexec_flag");
893
exitstatus = EX_OSERR;
894
goto fallback;
895
}
896
#endif /* O_CLOEXEC */
897
}
898
899
int good_name(const struct dirent * const dirent){
900
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
901
"*.dpkg-old", "*.dpkg-bak",
902
"*.dpkg-divert", NULL };
903
#ifdef __GNUC__
904
#pragma GCC diagnostic push
905
#pragma GCC diagnostic ignored "-Wcast-qual"
906
#endif
907
for(const char **pat = (const char **)patterns;
908
*pat != NULL; pat++){
909
#ifdef __GNUC__
910
#pragma GCC diagnostic pop
911
#endif
912
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
913
!= FNM_NOMATCH){
914
if(debug){
915
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
916
" matching pattern %s\n", dirent->d_name, *pat);
917
}
918
return 0;
386
919
}
387
920
}
921
return 1;
922
}
923
924
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
925
alphasort);
926
if(numplugins == -1){
927
error(0, errno, "Could not scan plugin dir");
928
direntries = NULL;
929
exitstatus = EX_OSERR;
930
goto fallback;
388
931
}
389
932
390
933
FD_ZERO(&rfds_all);
391
934
392
while(true){
393
dirst = readdir(dir);
394
395
// All directory entries have been processed
396
if(dirst == NULL){
397
if (errno == EBADF){
398
perror("readdir");
399
exitstatus = EXIT_FAILURE;
400
goto end;
401
}
402
break;
403
}
404
405
d_name_len = strlen(dirst->d_name);
406
407
// Ignore dotfiles, backup files and other junk
408
{
409
bool bad_name = false;
410
411
const char const *bad_prefixes[] = { ".", "#", NULL };
412
413
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
414
".dpkg-old",
415
".dpkg-divert", NULL };
416
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
417
size_t pre_len = strlen(*pre);
418
if((d_name_len >= pre_len)
419
and strncmp((dirst->d_name), *pre, pre_len) == 0){
420
if(debug){
421
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
422
" with bad prefix %s\n", dirst->d_name, *pre);
423
}
424
bad_name = true;
425
break;
426
}
427
}
428
429
if(bad_name){
430
continue;
431
}
432
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
434
size_t suf_len = strlen(*suf);
435
if((d_name_len >= suf_len)
436
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
437
== 0)){
438
if(debug){
439
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
440
" with bad suffix %s\n", dirst->d_name, *suf);
441
}
442
bad_name = true;
443
break;
444
}
445
}
446
447
if(bad_name){
448
continue;
449
}
450
}
451
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
461
462
ret = stat(filename, &st);
463
if (ret == -1){
464
perror("stat");
465
exitstatus = EXIT_FAILURE;
466
goto end;
467
}
468
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
935
/* Read and execute any executable in the plugin directory*/
936
for(int i = 0; i < numplugins; i++){
937
938
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
939
if(plugin_fd == -1){
940
error(0, errno, "Could not open plugin");
941
free(direntries[i]);
942
continue;
943
}
944
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
945
if(ret == -1){
946
error(0, errno, "stat");
947
close(plugin_fd);
948
free(direntries[i]);
949
continue;
950
}
951
952
/* Ignore non-executable files */
953
if(not S_ISREG(st.st_mode)
954
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
955
X_OK, 0)) != 0)){
470
956
if(debug){
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
472
" with bad type or mode\n", filename);
957
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
958
" with bad type or mode\n",
959
plugindir != NULL ? plugindir : PDIR,
960
direntries[i]->d_name);
473
961
}
474
free(filename);
475
continue;
476
}
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
962
close(plugin_fd);
963
free(direntries[i]);
964
continue;
965
}
966
967
plugin *p = getplugin(direntries[i]->d_name);
968
if(p == NULL){
969
error(0, errno, "getplugin");
970
close(plugin_fd);
971
free(direntries[i]);
972
continue;
973
}
974
if(p->disabled){
478
975
if(debug){
479
976
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
480
dirst->d_name);
977
direntries[i]->d_name);
481
978
}
482
free(filename);
979
close(plugin_fd);
980
free(direntries[i]);
483
981
continue;
484
982
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
486
983
{
487
984
/* Add global arguments to argument list for this plugin */
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
494
ret = pipe(pipefd);
495
if (ret == -1){
496
perror("pipe");
497
exitstatus = EXIT_FAILURE;
498
goto end;
499
}
985
plugin *g = getplugin(NULL);
986
if(g != NULL){
987
for(char **a = g->argv + 1; *a != NULL; a++){
988
if(not add_argument(p, *a)){
989
error(0, errno, "add_argument");
990
}
991
}
992
/* Add global environment variables */
993
for(char **e = g->environ; *e != NULL; e++){
994
if(not add_environment(p, *e, false)){
995
error(0, errno, "add_environment");
996
}
997
}
998
}
999
}
1000
/* If this plugin has any environment variables, we need to
1001
duplicate the environment from this process, too. */
1002
if(p->environ[0] != NULL){
1003
for(char **e = environ; *e != NULL; e++){
1004
if(not add_environment(p, *e, false)){
1005
error(0, errno, "add_environment");
1006
}
1007
}
1008
}
1009
1010
int pipefd[2];
1011
#ifndef O_CLOEXEC
1012
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1013
#else /* O_CLOEXEC */
1014
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
1015
#endif /* O_CLOEXEC */
1016
if(ret == -1){
1017
error(0, errno, "pipe");
1018
exitstatus = EX_OSERR;
1019
free(direntries[i]);
1020
goto fallback;
1021
}
1022
if(pipefd[0] >= FD_SETSIZE){
1023
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1024
FD_SETSIZE);
1025
close(pipefd[0]);
1026
close(pipefd[1]);
1027
exitstatus = EX_OSERR;
1028
free(direntries[i]);
1029
goto fallback;
1030
}
1031
#ifndef O_CLOEXEC
1032
/* Ask OS to automatic close the pipe on exec */
500
1033
ret = set_cloexec_flag(pipefd[0]);
501
1034
if(ret < 0){
502
perror("set_cloexec_flag");
503
exitstatus = EXIT_FAILURE;
504
goto end;
1035
error(0, errno, "set_cloexec_flag");
1036
close(pipefd[0]);
1037
close(pipefd[1]);
1038
exitstatus = EX_OSERR;
1039
free(direntries[i]);
1040
goto fallback;
505
1041
}
506
1042
ret = set_cloexec_flag(pipefd[1]);
507
1043
if(ret < 0){
508
perror("set_cloexec_flag");
509
exitstatus = EXIT_FAILURE;
510
goto end;
1044
error(0, errno, "set_cloexec_flag");
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
1049
goto fallback;
511
1050
}
1051
#endif /* not O_CLOEXEC */
512
1052
/* Block SIGCHLD until process is safely in process list */
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
514
1056
if(ret < 0){
515
perror("sigprocmask");
516
exitstatus = EXIT_FAILURE;
517
goto end;
518
}
519
// Starting a new process to be watched
520
pid_t pid = fork();
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
1060
goto fallback;
1061
}
1062
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
1067
if(pid == -1){
1068
error(0, errno, "fork");
1069
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1070
&sigchld_action.sa_mask, NULL));
1071
close(pipefd[0]);
1072
close(pipefd[1]);
1073
exitstatus = EX_OSERR;
1074
free(direntries[i]);
1075
goto fallback;
1076
}
521
1077
if(pid == 0){
522
1078
/* this is the child process */
523
1079
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
524
1080
if(ret < 0){
525
perror("sigaction");
526
_exit(EXIT_FAILURE);
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
527
1083
}
528
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
529
1085
if(ret < 0){
530
perror("sigprocmask");
531
_exit(EXIT_FAILURE);
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
532
1088
}
533
1089
534
1090
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
535
1091
if(ret == -1){
536
perror("dup2");
537
_exit(EXIT_FAILURE);
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
538
1094
}
539
1095
540
if(dirfd(dir) < 0){
541
/* If dir has no file descriptor, we could not set FD_CLOEXEC
542
above and must now close it manually here. */
543
closedir(dir);
544
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
1096
if(fexecve(plugin_fd, p->argv,
1097
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1098
error(0, errno, "fexecve for %s/%s",
1099
plugindir != NULL ? plugindir : PDIR,
1100
direntries[i]->d_name);
1101
_exit(EX_OSERR);
548
1102
}
549
1103
/* no return */
550
1104
}
551
/* parent process */
552
free(filename);
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1105
/* Parent process */
1106
close(pipefd[1]); /* Close unused write end of pipe */
1107
close(plugin_fd);
1108
plugin *new_plugin = getplugin(direntries[i]->d_name);
1109
if(new_plugin == NULL){
1110
error(0, errno, "getplugin");
1111
ret = (int)(TEMP_FAILURE_RETRY
1112
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1113
NULL)));
558
1114
if(ret < 0){
559
perror("sigprocmask");
1115
error(0, errno, "sigprocmask");
560
1116
}
561
exitstatus = EXIT_FAILURE;
562
goto end;
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1119
goto fallback;
563
1120
}
1121
free(direntries[i]);
564
1122
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
1123
new_plugin->pid = pid;
1124
new_plugin->fd = pipefd[0];
1125
1126
if(debug){
1127
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1128
new_plugin->name, (intmax_t) (new_plugin->pid));
1129
}
1130
570
1131
/* Unblock SIGCHLD so signal handler can be run if this process
571
1132
has already completed */
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
573
1136
if(ret < 0){
574
perror("sigprocmask");
575
exitstatus = EXIT_FAILURE;
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
free(plugin_list);
592
}
593
594
closedir(dir);
595
dir = NULL;
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
601
}
602
while(process_list){
1137
error(0, errno, "sigprocmask");
1138
exitstatus = EX_OSERR;
1139
goto fallback;
1140
}
1141
1142
FD_SET(new_plugin->fd, &rfds_all);
1143
1144
if(maxfd < new_plugin->fd){
1145
maxfd = new_plugin->fd;
1146
}
1147
}
1148
1149
free(direntries);
1150
direntries = NULL;
1151
close(dir_fd);
1152
dir_fd = -1;
1153
free_plugin(getplugin(NULL));
1154
1155
for(plugin *p = plugin_list; p != NULL; p = p->next){
1156
if(p->pid != 0){
1157
break;
1158
}
1159
if(p->next == NULL){
1160
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1161
" directory?\n");
1162
free_plugin_list();
1163
}
1164
}
1165
1166
/* Main loop while running plugins exist */
1167
while(plugin_list){
603
1168
fd_set rfds = rfds_all;
604
1169
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
605
if (select_ret == -1){
606
perror("select");
607
exitstatus = EXIT_FAILURE;
608
goto end;
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
1173
goto fallback;
609
1174
}
610
1175
/* OK, now either a process completed, or something can be read
611
1176
from one of them */
612
for(process *proc = process_list; proc ; proc = proc->next){
1177
for(plugin *proc = plugin_list; proc != NULL;){
613
1178
/* Is this process completely done? */
614
if(proc->eof and proc->completed){
1179
if(proc->completed and proc->eof){
615
1180
/* Only accept the plugin output if it exited cleanly */
616
1181
if(not WIFEXITED(proc->status)
617
1182
or WEXITSTATUS(proc->status) != 0){
618
1183
/* Bad exit by plugin */
1184
619
1185
if(debug){
620
1186
if(WIFEXITED(proc->status)){
621
fprintf(stderr, "Plugin %u exited with status %d\n",
622
(unsigned int) (proc->pid),
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
623
1190
WEXITSTATUS(proc->status));
624
} else if(WIFSIGNALED(proc->status)) {
625
fprintf(stderr, "Plugin %u killed by signal %d\n",
626
(unsigned int) (proc->pid),
627
WTERMSIG(proc->status));
628
} else if(WCOREDUMP(proc->status)){
629
fprintf(stderr, "Plugin %d dumped core\n",
630
(unsigned int) (proc->pid));
1191
} else if(WIFSIGNALED(proc->status)){
1192
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1193
" signal %d: %s\n", proc->name,
1194
(intmax_t) (proc->pid),
1195
WTERMSIG(proc->status),
1196
strsignal(WTERMSIG(proc->status)));
631
1197
}
632
1198
}
1199
633
1200
/* Remove the plugin */
634
1201
FD_CLR(proc->fd, &rfds_all);
1202
635
1203
/* Block signal while modifying process_list */
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
637
1208
if(ret < 0){
638
perror("sigprocmask");
639
exitstatus = EXIT_FAILURE;
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
break;
652
}
653
}
654
}
1209
error(0, errno, "sigprocmask");
1210
exitstatus = EX_OSERR;
1211
goto fallback;
1212
}
1213
1214
plugin *next_plugin = proc->next;
1215
free_plugin(proc);
1216
proc = next_plugin;
1217
655
1218
/* We are done modifying process list, so unblock signal */
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
657
NULL);
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
658
1222
if(ret < 0){
659
perror("sigprocmask");
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
1223
error(0, errno, "sigprocmask");
1224
exitstatus = EX_OSERR;
1225
goto fallback;
1226
}
1227
1228
if(plugin_list == NULL){
1229
break;
1230
}
1231
1232
continue;
667
1233
}
1234
668
1235
/* This process exited nicely, so print its buffer */
669
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1236
1237
bool bret = print_out_password(proc->buffer,
1238
proc->buffer_length);
671
1239
if(not bret){
672
perror("print_out_password");
673
exitstatus = EXIT_FAILURE;
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
674
1242
}
675
goto end;
1243
goto fallback;
676
1244
}
1245
677
1246
/* This process has not completed. Does it have any output? */
678
1247
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
679
1248
/* This process had nothing to say at this time */
1249
proc = proc->next;
680
1250
continue;
681
1251
}
682
1252
/* Before reading, make the process' data buffer large enough */
683
1253
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
684
proc->buffer = realloc(proc->buffer, proc->buffer_size
685
+ (size_t) BUFFER_SIZE);
686
if (proc->buffer == NULL){
687
perror("malloc");
688
exitstatus = EXIT_FAILURE;
689
goto end;
1254
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1255
+ (size_t) BUFFER_SIZE);
1256
if(new_buffer == NULL){
1257
error(0, errno, "malloc");
1258
exitstatus = EX_OSERR;
1259
goto fallback;
690
1260
}
1261
proc->buffer = new_buffer;
691
1262
proc->buffer_size += BUFFER_SIZE;
692
1263
}
693
1264
/* Read from the process */
694
ret = read(proc->fd, proc->buffer + proc->buffer_length,
695
BUFFER_SIZE);
696
if(ret < 0){
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
697
1270
/* Read error from this process; ignore the error */
1271
proc = proc->next;
698
1272
continue;
699
1273
}
700
if(ret == 0){
1274
if(sret == 0){
701
1275
/* got EOF */
702
1276
proc->eof = true;
703
1277
} else {
704
proc->buffer_length += (size_t) ret;
1278
proc->buffer_length += (size_t) sret;
705
1279
}
706
1280
}
707
1281
}
708
1282
709
if(process_list == NULL){
1283
1284
fallback:
1285
1286
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1287
and exitstatus != EX_OK)){
1288
/* Fallback if all plugins failed, none are found or an error
1289
occured */
710
1290
bool bret;
711
1291
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
712
1292
char *passwordbuffer = getpass("Password: ");
713
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
714
if(not bret){
715
perror("print_out_password");
716
exitstatus = EXIT_FAILURE;
717
goto end;
1293
size_t len = strlen(passwordbuffer);
1294
/* Strip trailing newline */
1295
if(len > 0 and passwordbuffer[len-1] == '\n'){
1296
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1297
len--;
718
1298
}
719
bret = print_out_password("\n", 1);
1299
bret = print_out_password(passwordbuffer, len);
720
1300
if(not bret){
721
perror("print_out_password");
722
exitstatus = EXIT_FAILURE;
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
723
1303
}
724
1304
}
725
726
end:
727
1305
728
1306
/* Restore old signal handler */
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
738
}
739
740
if(dir != NULL){
741
closedir(dir);
742
}
743
744
/* Free the process list and kill the processes */
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
752
}
753
free(process_list->buffer);
754
free(process_list);
1307
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1308
if(ret == -1){
1309
error(0, errno, "sigaction");
1310
exitstatus = EX_OSERR;
1311
}
1312
1313
if(custom_argv != NULL){
1314
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1315
free(*arg);
1316
}
1317
free(custom_argv);
1318
}
1319
1320
free(direntries);
1321
1322
if(dir_fd != -1){
1323
close(dir_fd);
1324
}
1325
1326
/* Kill the processes */
1327
for(plugin *p = plugin_list; p != NULL; p = p->next){
1328
if(p->pid != 0){
1329
close(p->fd);
1330
ret = kill(p->pid, SIGTERM);
1331
if(ret == -1 and errno != ESRCH){
1332
/* Set-uid proccesses might not get closed */
1333
error(0, errno, "kill");
1334
}
1335
}
755
1336
}
756
1337
757
1338
/* Wait for any remaining child processes to terminate */
758
do{
1339
do {
759
1340
ret = wait(NULL);
760
1341
} while(ret >= 0);
761
1342
if(errno != ECHILD){
762
perror("wait");
1343
error(0, errno, "wait");
763
1344
}
764
1345
1346
free_plugin_list();
1347
1348
free(plugindir);
1349
free(pluginhelperdir);
1350
free(argfile);
1351
765
1352
return exitstatus;
766
1353
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0