To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to mandos-client.c
- browse files at revision 24.1.50
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.50
- Committer: Björn Påhlsson
- Date: 2008-08-14 01:32:34 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 75.
- Revision ID: belorn@braxen-20080814013234-qs0s608s3gxwb5t7
changed from using strtok to strsep
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos-client.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2020 Teddy Hogeborn
6
* Copyright © 2008-2020 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
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
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
24
22
*/
25
23
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), reallocarray(), realloc(),
30
EXIT_SUCCESS, exit() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
31
29
#include <stdbool.h> /* bool, true, false */
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() */
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() */
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
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
*/
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() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), strcpy(),
55
strcat() */
57
56
#include <errno.h> /* errno */
58
57
#include <argp.h> /* struct argp_option, struct
59
58
argp_state, struct argp,
60
59
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
61
#include <signal.h> /* struct sigaction, sigemptyset(),
64
62
sigaddset(), sigaction(),
65
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
SIG_UNBLOCK, kill() */
68
65
#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() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
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*/
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{
94
75
pid_t pid;
95
76
int fd;
96
77
char *buffer;
97
78
size_t buffer_size;
98
79
size_t buffer_length;
99
80
bool eof;
100
volatile sig_atomic_t completed;
81
bool completed;
101
82
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;
102
91
struct plugin *next;
103
92
} plugin;
104
93
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))){
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))){
115
98
return p;
116
99
}
117
100
}
118
101
/* Create a new plugin */
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;
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;
155
114
new_plugin->argv[1] = NULL;
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
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
170
118
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
172
120
return new_plugin;
173
121
}
174
122
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
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
256
134
/*
257
135
* Based on the example in the GNU LibC manual chapter 13.13 "File
258
136
* Descriptor Flags".
259
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
137
* *Note File Descriptor Flags:(libc)Descriptor Flags.
260
138
*/
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));
139
static int set_cloexec_flag(int fd)
140
{
141
int ret = fcntl(fd, F_GETFD, 0);
264
142
/* If reading the flags failed, return error indication now. */
265
143
if(ret < 0){
266
144
return ret;
267
145
}
268
146
/* Store modified flag word in the descriptor. */
269
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
270
ret | FD_CLOEXEC));
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
271
148
}
272
#endif /* not O_CLOEXEC */
273
274
275
/* Mark processes as completed when they exit, and save their exit
149
150
process *process_list = NULL;
151
152
/* Mark a process as completed when it exits, and save its exit
276
153
status. */
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;
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;
307
171
}
308
172
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){
173
bool print_out_password(const char *buffer, size_t length){
312
174
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
313
178
for(size_t written = 0; written < length; written += (size_t)ret){
314
179
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
315
180
length - written));
320
185
return true;
321
186
}
322
187
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
361
188
int main(int argc, char *argv[]){
362
char *plugindir = NULL;
363
char *pluginhelperdir = NULL;
364
char *argfile = NULL;
365
FILE *conffp;
366
struct dirent **direntries = NULL;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
190
size_t d_name_len;
191
DIR *dir = NULL;
192
struct dirent *dirst;
367
193
struct stat st;
368
194
fd_set rfds_all;
369
195
int ret, maxfd = 0;
370
ssize_t sret;
371
196
uid_t uid = 65534;
372
197
gid_t gid = 65534;
373
198
bool debug = false;
375
200
struct sigaction old_sigchld_action;
376
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
377
202
.sa_flags = SA_NOCLDSTOP };
378
char **custom_argv = NULL;
379
int custom_argc = 0;
380
int dir_fd = -1;
381
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
382
206
/* Establish a signal handler */
383
207
sigemptyset(&sigchld_action.sa_mask);
384
208
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
385
if(ret == -1){
386
error(0, errno, "sigaddset");
387
exitstatus = EX_OSERR;
388
goto fallback;
209
if(ret < 0){
210
perror("sigaddset");
211
exit(EXIT_FAILURE);
389
212
}
390
213
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
391
if(ret == -1){
392
error(0, errno, "sigaction");
393
exitstatus = EX_OSERR;
394
goto fallback;
214
if(ret < 0){
215
perror("sigaction");
216
exit(EXIT_FAILURE);
395
217
}
396
218
397
219
/* The options we understand. */
399
221
{ .name = "global-options", .key = 'g',
400
222
.arg = "OPTION[,OPTION[,...]]",
401
223
.doc = "Options passed to all plugins" },
402
{ .name = "global-env", .key = 'G',
403
.arg = "VAR=value",
404
.doc = "Environment variable passed to all plugins" },
405
224
{ .name = "options-for", .key = 'o',
406
225
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
407
226
.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" },
411
227
{ .name = "disable", .key = 'd',
412
228
.arg = "PLUGIN",
413
229
.doc = "Disable a specific plugin", .group = 1 },
414
{ .name = "enable", .key = 'e',
415
.arg = "PLUGIN",
416
.doc = "Enable a specific plugin", .group = 1 },
417
230
{ .name = "plugin-dir", .key = 128,
418
231
.arg = "DIRECTORY",
419
232
.doc = "Specify a different plugin directory", .group = 2 },
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 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
444
241
{ .name = NULL }
445
242
};
446
243
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 */
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p;
252
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
254
continue;
255
}
256
addargument(getplugin(NULL, plugins), p);
257
}
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
264
break;
265
}
266
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
276
addargument(getplugin(name, plugins), p);
277
}
278
}
279
}
280
break;
281
case 'd':
282
if (arg != NULL){
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
290
uid = (uid_t)strtol(arg, NULL, 10);
291
break;
292
case 130:
293
gid = (gid_t)strtol(arg, NULL, 10);
294
break;
295
case 131:
564
296
debug = true;
565
297
break;
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 = "",
298
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
301
}
302
plus_options = arg;
303
break;
304
case ARGP_KEY_END:
305
break;
306
default:
307
return ARGP_ERR_UNKNOWN;
308
}
309
return 0;
310
}
311
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
651
316
.doc = "Mandos plugin runner -- Run plugins" };
652
317
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);
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
319
if (ret == ARGP_ERR_UNKNOWN){
320
fprintf(stderr, "Unknown error while parsing arguments\n");
321
exitstatus = EXIT_FAILURE;
322
goto end;
323
}
324
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
335
perror("malloc");
336
exitstatus = EXIT_FAILURE;
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
356
if (ret == ARGP_ERR_UNKNOWN){
357
fprintf(stderr, "Unknown error while parsing arguments\n");
358
exitstatus = EXIT_FAILURE;
359
goto end;
822
360
}
823
361
}
824
362
825
363
if(debug){
826
for(plugin *p = plugin_list; p != NULL; p = p->next){
364
for(plugin *p = plugin_list; p != NULL; p=p->next){
827
365
fprintf(stderr, "Plugin: %s has %d arguments\n",
828
366
p->name ? p->name : "Global", p->argc - 1);
829
367
for(char **a = p->argv; *a != NULL; a++){
830
368
fprintf(stderr, "\tArg: %s\n", *a);
831
369
}
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
}
370
}
371
}
372
868
373
ret = setuid(uid);
869
if(ret == -1){
870
error(0, errno, "setuid");
871
}
872
873
/* Open plugin directory with close_on_exec flag */
374
if (ret == -1){
375
perror("setuid");
376
}
377
378
setgid(gid);
379
if (ret == -1){
380
perror("setgid");
381
}
382
383
dir = opendir(plugindir);
384
if(dir == NULL){
385
perror("Could not open plugin dir");
386
exitstatus = EXIT_FAILURE;
387
goto end;
388
}
389
390
/* Set the FD_CLOEXEC flag on the directory, if possible */
874
391
{
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;
392
int dir_fd = dirfd(dir);
393
if(dir_fd >= 0){
394
ret = set_cloexec_flag(dir_fd);
395
if(ret < 0){
396
perror("set_cloexec_flag");
397
exitstatus = EXIT_FAILURE;
398
goto end;
919
399
}
920
400
}
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;
931
401
}
932
402
933
403
FD_ZERO(&rfds_all);
934
404
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)){
405
while(true){
406
dirst = readdir(dir);
407
408
// All directory entries have been processed
409
if(dirst == NULL){
410
if (errno == EBADF){
411
perror("readdir");
412
exitstatus = EXIT_FAILURE;
413
goto end;
414
}
415
break;
416
}
417
418
d_name_len = strlen(dirst->d_name);
419
420
// Ignore dotfiles, backup files and other junk
421
{
422
bool bad_name = false;
423
424
const char const *bad_prefixes[] = { ".", "#", NULL };
425
426
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
427
".dpkg-old",
428
".dpkg-divert", NULL };
429
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
430
size_t pre_len = strlen(*pre);
431
if((d_name_len >= pre_len)
432
and strncmp((dirst->d_name), *pre, pre_len) == 0){
433
if(debug){
434
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
435
" with bad prefix %s\n", dirst->d_name, *pre);
436
}
437
bad_name = true;
438
break;
439
}
440
}
441
442
if(bad_name){
443
continue;
444
}
445
446
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
447
size_t suf_len = strlen(*suf);
448
if((d_name_len >= suf_len)
449
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
450
== 0)){
451
if(debug){
452
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
453
" with bad suffix %s\n", dirst->d_name, *suf);
454
}
455
bad_name = true;
456
break;
457
}
458
}
459
460
if(bad_name){
461
continue;
462
}
463
}
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
468
continue;
469
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
473
474
ret = stat(filename, &st);
475
if (ret == -1){
476
perror("stat");
477
free(filename);
478
continue;
479
}
480
481
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
956
482
if(debug){
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);
483
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
484
" with bad type or mode\n", filename);
961
485
}
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){
486
free(filename);
487
continue;
488
}
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
975
490
if(debug){
976
491
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
977
direntries[i]->d_name);
492
dirst->d_name);
978
493
}
979
close(plugin_fd);
980
free(direntries[i]);
494
free(filename);
981
495
continue;
982
496
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
983
498
{
984
499
/* Add global arguments to argument list for this plugin */
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
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
506
ret = pipe(pipefd);
507
if (ret == -1){
508
perror("pipe");
509
exitstatus = EXIT_FAILURE;
510
goto end;
511
}
1033
512
ret = set_cloexec_flag(pipefd[0]);
1034
513
if(ret < 0){
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;
514
perror("set_cloexec_flag");
515
exitstatus = EXIT_FAILURE;
516
goto end;
1041
517
}
1042
518
ret = set_cloexec_flag(pipefd[1]);
1043
519
if(ret < 0){
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;
520
perror("set_cloexec_flag");
521
exitstatus = EXIT_FAILURE;
522
goto end;
1050
523
}
1051
#endif /* not O_CLOEXEC */
1052
524
/* Block SIGCHLD until process is safely in process list */
1053
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1054
&sigchld_action.sa_mask,
1055
NULL));
525
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1056
526
if(ret < 0){
1057
error(0, errno, "sigprocmask");
1058
exitstatus = EX_OSERR;
1059
free(direntries[i]);
1060
goto fallback;
527
perror("sigprocmask");
528
exitstatus = EXIT_FAILURE;
529
goto end;
1061
530
}
1062
/* Starting a new process to be watched */
1063
pid_t pid;
1064
do {
1065
pid = fork();
1066
} while(pid == -1 and errno == EINTR);
531
// Starting a new process to be watched
532
pid_t pid = fork();
1067
533
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;
534
perror("fork");
535
exitstatus = EXIT_FAILURE;
536
goto end;
1076
537
}
1077
538
if(pid == 0){
1078
539
/* this is the child process */
1079
540
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1080
541
if(ret < 0){
1081
error(0, errno, "sigaction");
1082
_exit(EX_OSERR);
542
perror("sigaction");
543
_exit(EXIT_FAILURE);
1083
544
}
1084
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1085
546
if(ret < 0){
1086
error(0, errno, "sigprocmask");
1087
_exit(EX_OSERR);
547
perror("sigprocmask");
548
_exit(EXIT_FAILURE);
1088
549
}
1089
550
1090
551
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1091
552
if(ret == -1){
1092
error(0, errno, "dup2");
1093
_exit(EX_OSERR);
553
perror("dup2");
554
_exit(EXIT_FAILURE);
1094
555
}
1095
556
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);
557
if(dirfd(dir) < 0){
558
/* If dir has no file descriptor, we could not set FD_CLOEXEC
559
above and must now close it manually here. */
560
closedir(dir);
561
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
1102
565
}
1103
566
/* no return */
1104
567
}
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)));
568
/* parent process */
569
free(filename);
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
574
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1114
575
if(ret < 0){
1115
error(0, errno, "sigprocmask");
576
perror("sigprocmask");
1116
577
}
1117
exitstatus = EX_OSERR;
1118
free(direntries[i]);
1119
goto fallback;
578
exitstatus = EXIT_FAILURE;
579
goto end;
1120
580
}
1121
free(direntries[i]);
1122
581
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
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
1131
587
/* Unblock SIGCHLD so signal handler can be run if this process
1132
588
has already completed */
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1134
&sigchld_action.sa_mask,
1135
NULL));
589
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1136
590
if(ret < 0){
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){
591
perror("sigprocmask");
592
exitstatus = EXIT_FAILURE;
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
609
}
610
611
closedir(dir);
612
dir = NULL;
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
618
}
619
while(process_list){
1168
620
fd_set rfds = rfds_all;
1169
621
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1170
if(select_ret == -1 and errno != EINTR){
1171
error(0, errno, "select");
1172
exitstatus = EX_OSERR;
1173
goto fallback;
622
if (select_ret == -1){
623
perror("select");
624
exitstatus = EXIT_FAILURE;
625
goto end;
1174
626
}
1175
627
/* OK, now either a process completed, or something can be read
1176
628
from one of them */
1177
for(plugin *proc = plugin_list; proc != NULL;){
629
for(process *proc = process_list; proc ; proc = proc->next){
1178
630
/* Is this process completely done? */
1179
if(proc->completed and proc->eof){
631
if(proc->eof and proc->completed){
1180
632
/* Only accept the plugin output if it exited cleanly */
1181
633
if(not WIFEXITED(proc->status)
1182
634
or WEXITSTATUS(proc->status) != 0){
1183
635
/* Bad exit by plugin */
1184
1185
636
if(debug){
1186
637
if(WIFEXITED(proc->status)){
1187
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1188
" status %d\n", proc->name,
1189
(intmax_t) (proc->pid),
638
fprintf(stderr, "Plugin %u exited with status %d\n",
639
(unsigned int) (proc->pid),
1190
640
WEXITSTATUS(proc->status));
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)));
641
} else if(WIFSIGNALED(proc->status)) {
642
fprintf(stderr, "Plugin %u killed by signal %d\n",
643
(unsigned int) (proc->pid),
644
WTERMSIG(proc->status));
645
} else if(WCOREDUMP(proc->status)){
646
fprintf(stderr, "Plugin %d dumped core\n",
647
(unsigned int) (proc->pid));
1197
648
}
1198
649
}
1199
1200
650
/* Remove the plugin */
1201
651
FD_CLR(proc->fd, &rfds_all);
1202
1203
652
/* Block signal while modifying process_list */
1204
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1205
(SIG_BLOCK,
1206
&sigchld_action.sa_mask,
1207
NULL));
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1208
654
if(ret < 0){
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
perror("sigprocmask");
656
exitstatus = EXIT_FAILURE;
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
1218
672
/* We are done modifying process list, so unblock signal */
1219
ret = (int)(TEMP_FAILURE_RETRY
1220
(sigprocmask(SIG_UNBLOCK,
1221
&sigchld_action.sa_mask, NULL)));
673
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
674
NULL);
1222
675
if(ret < 0){
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;
676
perror("sigprocmask");
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
1233
684
}
1234
1235
685
/* This process exited nicely, so print its buffer */
1236
1237
bool bret = print_out_password(proc->buffer,
1238
proc->buffer_length);
686
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1239
688
if(not bret){
1240
error(0, errno, "print_out_password");
1241
exitstatus = EX_IOERR;
689
perror("print_out_password");
690
exitstatus = EXIT_FAILURE;
1242
691
}
1243
goto fallback;
692
goto end;
1244
693
}
1245
1246
694
/* This process has not completed. Does it have any output? */
1247
695
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1248
696
/* This process had nothing to say at this time */
1249
proc = proc->next;
1250
697
continue;
1251
698
}
1252
699
/* Before reading, make the process' data buffer large enough */
1253
700
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
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;
701
proc->buffer = realloc(proc->buffer, proc->buffer_size
702
+ (size_t) BUFFER_SIZE);
703
if (proc->buffer == NULL){
704
perror("malloc");
705
exitstatus = EXIT_FAILURE;
706
goto end;
1260
707
}
1261
proc->buffer = new_buffer;
1262
708
proc->buffer_size += BUFFER_SIZE;
1263
709
}
1264
710
/* Read from the process */
1265
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1266
proc->buffer
1267
+ proc->buffer_length,
1268
BUFFER_SIZE));
1269
if(sret < 0){
711
ret = read(proc->fd, proc->buffer + proc->buffer_length,
712
BUFFER_SIZE);
713
if(ret < 0){
1270
714
/* Read error from this process; ignore the error */
1271
proc = proc->next;
1272
715
continue;
1273
716
}
1274
if(sret == 0){
717
if(ret == 0){
1275
718
/* got EOF */
1276
719
proc->eof = true;
1277
720
} else {
1278
proc->buffer_length += (size_t) sret;
721
proc->buffer_length += (size_t) ret;
1279
722
}
1280
723
}
1281
724
}
1282
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 */
725
726
727
end:
728
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1290
731
bool bret;
1291
732
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1292
733
char *passwordbuffer = getpass("Password: ");
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--;
1298
}
1299
bret = print_out_password(passwordbuffer, len);
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1300
735
if(not bret){
1301
error(0, errno, "print_out_password");
1302
exitstatus = EX_IOERR;
736
perror("print_out_password");
737
exitstatus = EXIT_FAILURE;
738
goto end;
1303
739
}
1304
740
}
1305
741
1306
742
/* Restore old signal handler */
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
}
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
752
}
753
754
if(dir != NULL){
755
closedir(dir);
756
}
757
758
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
766
}
767
free(process_list->buffer);
768
free(process_list);
1336
769
}
1337
770
1338
771
/* Wait for any remaining child processes to terminate */
1339
do {
772
do{
1340
773
ret = wait(NULL);
1341
774
} while(ret >= 0);
1342
775
if(errno != ECHILD){
1343
error(0, errno, "wait");
776
perror("wait");
1344
777
}
1345
778
1346
free_plugin_list();
1347
1348
free(plugindir);
1349
free(pluginhelperdir);
1350
free(argfile);
1351
1352
779
return exitstatus;
1353
780
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0