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- Committer: Teddy Hogeborn
- Date: 2008-08-18 03:25:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818032501-2cl874fi3uvsqn1b
* mandos.xml (SYNOPSIS): Removed unnecessary 'choice="opt"' from <arg>
tags. Also show the "-h" option.
(OPTIONS): Note that failure to obey the "--interface" option is not
considered critical.
(ENVIRONMENT): New section to document the use of PATH by /bin/sh.
(FILES): Added "/bin/sh".
(BUGS): Add five bugs from the TODO file.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
(SERVER, CLIENTS): Added "id" attribute.
(CLIENT): Document the security implications of one of the five
bugs added to the BUGS section.
tags. Also show the "-h" option.
(OPTIONS): Note that failure to obey the "--interface" option is not
considered critical.
(ENVIRONMENT): New section to document the use of PATH by /bin/sh.
(FILES): Added "/bin/sh".
(BUGS): Add five bugs from the TODO file.
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
(SERVER, CLIENTS): Added "id" attribute.
(CLIENT): Document the security implications of one of the five
bugs added to the BUGS section.
- files added:
- initramfs-tools-hook-conf
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- 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
plugin-runner.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 © 2008-2018 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
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
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
27
O_CLOEXEC, pipe2() */
25
asprintf() */
28
26
#include <stddef.h> /* size_t, NULL */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
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(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
60
58
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
60
#include <signal.h> /* struct sigaction, sigemptyset(),
64
61
sigaddset(), sigaction(),
65
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
63
SIG_UNBLOCK, kill() */
68
64
#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
65
76
66
#define BUFFER_SIZE 256
77
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>";
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
84
85
85
86
typedef struct plugin{
86
87
char *name; /* can be NULL or any plugin name */
89
90
char **environ;
90
91
int envc;
91
92
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
93
struct plugin *next;
103
94
} plugin;
104
95
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))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
115
100
return p;
116
101
}
117
102
}
118
103
/* 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);
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
106
return NULL;
107
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
111
}
112
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
118
119
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
150
121
free(new_plugin);
151
errno = e;
152
122
return NULL;
153
123
}
154
124
new_plugin->argv[0] = copy_name;
155
125
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
126
127
new_plugin->environ = malloc(sizeof(char *));
160
128
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
129
free(new_plugin->argv);
164
130
free(new_plugin);
165
errno = e;
166
131
return NULL;
167
132
}
168
133
new_plugin->environ[0] = NULL;
169
170
134
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
172
136
return new_plugin;
173
137
}
174
138
175
139
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
140
static bool add_to_char_array(const char *new, char ***array,
178
141
int *len){
179
142
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
143
*array = realloc(*array, sizeof(char *)
144
* (size_t) ((*len) + 2));
185
145
/* Malloc check */
186
if(new_array == NULL){
146
if(*array == NULL){
187
147
return false;
188
148
}
189
*array = new_array;
190
149
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
150
char *copy = strdup(new);
195
151
if(copy == NULL){
196
152
return false;
197
153
}
204
160
}
205
161
206
162
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
163
static bool add_argument(plugin *p, const char *arg){
209
164
if(p == NULL){
210
165
return false;
213
168
}
214
169
215
170
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
218
172
if(p == NULL){
219
173
return false;
220
174
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
175
return add_to_char_array(def, &(p->environ), &(p->envc));
242
176
}
243
177
244
#ifndef O_CLOEXEC
178
245
179
/*
246
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
181
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
183
*/
250
__attribute__((warn_unused_result))
251
static int set_cloexec_flag(int fd){
252
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
184
static int set_cloexec_flag(int fd)
185
{
186
int ret = fcntl(fd, F_GETFD, 0);
253
187
/* If reading the flags failed, return error indication now. */
254
188
if(ret < 0){
255
189
return ret;
256
190
}
257
191
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
193
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
194
195
process *process_list = NULL;
196
197
/* Mark a process as completed when it exits, and save its exit
265
198
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
296
216
}
297
217
298
/* Prints out a password to stdout */
299
__attribute__((nonnull, warn_unused_result))
300
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
301
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
302
223
for(size_t written = 0; written < length; written += (size_t)ret){
303
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
225
length - written));
309
230
return true;
310
231
}
311
232
312
/* Removes and free a plugin from the plugin list */
313
__attribute__((nonnull))
314
static void free_plugin(plugin *plugin_node){
315
316
for(char **arg = (plugin_node->argv)+1; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->name);
320
free(plugin_node->argv);
321
for(char **env = plugin_node->environ; *env != NULL; env++){
322
free(*env);
323
}
324
free(plugin_node->environ);
325
free(plugin_node->buffer);
326
327
/* Removes the plugin from the singly-linked list */
328
if(plugin_node == plugin_list){
329
/* First one - simple */
330
plugin_list = plugin_list->next;
331
} else {
332
/* Second one or later */
333
for(plugin *p = plugin_list; p != NULL; p = p->next){
334
if(p->next == plugin_node){
335
p->next = plugin_node->next;
336
break;
337
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
338
239
}
339
}
340
341
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
342
252
}
343
253
344
static void free_plugin_list(void){
345
while(plugin_list != NULL){
346
free_plugin(plugin_list);
347
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
348
268
}
349
269
350
270
int main(int argc, char *argv[]){
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
354
273
FILE *conffp;
355
struct dirent **direntries = NULL;
274
size_t d_name_len;
275
DIR *dir = NULL;
276
struct dirent *dirst;
356
277
struct stat st;
357
278
fd_set rfds_all;
358
279
int ret, maxfd = 0;
359
ssize_t sret;
360
280
uid_t uid = 65534;
361
281
gid_t gid = 65534;
362
282
bool debug = false;
366
286
.sa_flags = SA_NOCLDSTOP };
367
287
char **custom_argv = NULL;
368
288
int custom_argc = 0;
369
int dir_fd = -1;
370
289
371
290
/* Establish a signal handler */
372
291
sigemptyset(&sigchld_action.sa_mask);
373
292
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
374
293
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
294
perror("sigaddset");
295
exitstatus = EXIT_FAILURE;
377
296
goto fallback;
378
297
}
379
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
380
299
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
300
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
383
302
goto fallback;
384
303
}
385
304
388
307
{ .name = "global-options", .key = 'g',
389
308
.arg = "OPTION[,OPTION[,...]]",
390
309
.doc = "Options passed to all plugins" },
391
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
392
311
.arg = "VAR=value",
393
312
.doc = "Environment variable passed to all plugins" },
394
313
{ .name = "options-for", .key = 'o',
395
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
396
315
.doc = "Options passed only to specified plugin" },
397
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
398
317
.arg = "PLUGIN:ENV=value",
399
318
.doc = "Environment variable passed to specified plugin" },
400
319
{ .name = "disable", .key = 'd',
401
320
.arg = "PLUGIN",
402
321
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
406
322
{ .name = "plugin-dir", .key = 128,
407
323
.arg = "DIRECTORY",
408
324
.doc = "Specify a different plugin directory", .group = 2 },
409
{ .name = "config-file", .key = 129,
410
.arg = "FILE",
411
.doc = "Specify a different configuration file", .group = 2 },
412
{ .name = "userid", .key = 130,
413
.arg = "ID", .flags = 0,
414
.doc = "User ID the plugins will run as", .group = 3 },
415
{ .name = "groupid", .key = 131,
416
.arg = "ID", .flags = 0,
417
.doc = "Group ID the plugins will run as", .group = 3 },
418
{ .name = "debug", .key = 132,
419
.doc = "Debug mode", .group = 4 },
420
{ .name = "plugin-helper-dir", .key = 133,
421
.arg = "DIRECTORY",
422
.doc = "Specify a different plugin helper directory",
423
.group = 2 },
424
/*
425
* These reproduce what we would get without ARGP_NO_HELP
426
*/
427
{ .name = "help", .key = '?',
428
.doc = "Give this help list", .group = -1 },
429
{ .name = "usage", .key = -3,
430
.doc = "Give a short usage message", .group = -1 },
431
{ .name = "version", .key = 'V',
432
.doc = "Print program version", .group = -1 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
433
333
{ .name = NULL }
434
334
};
435
335
436
__attribute__((nonnull(3)))
437
error_t parse_opt(int key, char *arg, struct argp_state *state){
438
errno = 0;
439
switch(key){
440
char *tmp;
441
intmax_t tmp_id;
442
case 'g': /* --global-options */
443
{
444
char *plugin_option;
445
while((plugin_option = strsep(&arg, ",")) != NULL){
446
if(not add_argument(getplugin(NULL), plugin_option)){
447
break;
448
}
449
}
450
errno = 0;
451
}
452
break;
453
case 'G': /* --global-env */
454
if(add_environment(getplugin(NULL), arg, true)){
455
errno = 0;
456
}
457
break;
458
case 'o': /* --options-for */
459
{
460
char *option_list = strchr(arg, ':');
461
if(option_list == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*option_list = '\0';
467
option_list++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
char *option;
474
while((option = strsep(&option_list, ",")) != NULL){
475
if(not add_argument(getplugin(arg), option)){
476
break;
477
}
478
}
479
errno = 0;
480
}
481
break;
482
case 'E': /* --env-for */
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
483
397
{
484
398
char *envdef = strchr(arg, ':');
485
399
if(envdef == NULL){
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
491
406
envdef++;
492
if(arg[0] == '\0'){
493
argp_error(state, "Empty plugin name");
494
errno = EINVAL;
495
break;
496
}
497
if(add_environment(getplugin(arg), envdef, true)){
498
errno = 0;
499
}
500
}
501
break;
502
case 'd': /* --disable */
503
{
504
plugin *p = getplugin(arg);
505
if(p != NULL){
506
p->disabled = true;
507
errno = 0;
508
}
509
}
510
break;
511
case 'e': /* --enable */
512
{
513
plugin *p = getplugin(arg);
514
if(p != NULL){
515
p->disabled = false;
516
errno = 0;
517
}
518
}
519
break;
520
case 128: /* --plugin-dir */
521
free(plugindir);
522
plugindir = strdup(arg);
523
if(plugindir != NULL){
524
errno = 0;
525
}
526
break;
527
case 129: /* --config-file */
528
/* This is already done by parse_opt_config_file() */
529
break;
530
case 130: /* --userid */
531
tmp_id = strtoimax(arg, &tmp, 10);
532
if(errno != 0 or tmp == arg or *tmp != '\0'
533
or tmp_id != (uid_t)tmp_id){
534
argp_error(state, "Bad user ID number: \"%s\", using %"
535
PRIdMAX, arg, (intmax_t)uid);
536
break;
537
}
538
uid = (uid_t)tmp_id;
539
errno = 0;
540
break;
541
case 131: /* --groupid */
542
tmp_id = strtoimax(arg, &tmp, 10);
543
if(errno != 0 or tmp == arg or *tmp != '\0'
544
or tmp_id != (gid_t)tmp_id){
545
argp_error(state, "Bad group ID number: \"%s\", using %"
546
PRIdMAX, arg, (intmax_t)gid);
547
break;
548
}
549
gid = (gid_t)tmp_id;
550
errno = 0;
551
break;
552
case 132: /* --debug */
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
553
431
debug = true;
554
432
break;
555
case 133: /* --plugin-helper-dir */
556
free(pluginhelperdir);
557
pluginhelperdir = strdup(arg);
558
if(pluginhelperdir != NULL){
559
errno = 0;
560
}
561
break;
562
/*
563
* These reproduce what we would get without ARGP_NO_HELP
564
*/
565
case '?': /* --help */
566
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
567
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
568
__builtin_unreachable();
569
case -3: /* --usage */
570
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
571
argp_state_help(state, state->out_stream,
572
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
573
__builtin_unreachable();
574
case 'V': /* --version */
575
fprintf(state->out_stream, "%s\n", argp_program_version);
576
exit(EXIT_SUCCESS);
577
break;
578
/*
579
* When adding more options before this line, remember to also add a
580
* "case" to the "parse_opt_config_file" function below.
581
*/
582
case ARGP_KEY_ARG:
583
/* Cryptsetup always passes an argument, which is an empty
584
string if "none" was specified in /etc/crypttab. So if
585
argument was empty, we ignore it silently. */
586
if(arg[0] == '\0'){
587
break;
588
}
589
/* FALLTHROUGH */
590
default:
591
return ARGP_ERR_UNKNOWN;
592
}
593
return errno; /* Set to 0 at start */
594
}
595
596
/* This option parser is the same as parse_opt() above, except it
597
ignores everything but the --config-file option. */
598
error_t parse_opt_config_file(int key, char *arg,
599
__attribute__((unused))
600
struct argp_state *state){
601
errno = 0;
602
switch(key){
603
case 'g': /* --global-options */
604
case 'G': /* --global-env */
605
case 'o': /* --options-for */
606
case 'E': /* --env-for */
607
case 'd': /* --disable */
608
case 'e': /* --enable */
609
case 128: /* --plugin-dir */
610
break;
611
case 129: /* --config-file */
612
free(argfile);
613
argfile = strdup(arg);
614
if(argfile != NULL){
615
errno = 0;
616
}
617
break;
618
case 130: /* --userid */
619
case 131: /* --groupid */
620
case 132: /* --debug */
621
case 133: /* --plugin-helper-dir */
622
case '?': /* --help */
623
case -3: /* --usage */
624
case 'V': /* --version */
625
case ARGP_KEY_ARG:
626
break;
627
default:
628
return ARGP_ERR_UNKNOWN;
629
}
630
return errno;
631
}
632
633
struct argp argp = { .options = options,
634
.parser = parse_opt_config_file,
635
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
636
448
.doc = "Mandos plugin runner -- Run plugins" };
637
449
638
/* Parse using parse_opt_config_file() in order to get the custom
639
config file location, if any. */
640
ret = argp_parse(&argp, argc, argv,
641
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
642
NULL, NULL);
643
switch(ret){
644
case 0:
645
break;
646
case ENOMEM:
647
default:
648
errno = ret;
649
error(0, errno, "argp_parse");
650
exitstatus = EX_OSERR;
651
goto fallback;
652
case EINVAL:
653
exitstatus = EX_USAGE;
654
goto fallback;
655
}
656
657
/* Reset to the normal argument parser */
658
argp.parser = parse_opt;
659
660
/* Open the configfile if available */
661
if(argfile == NULL){
662
conffp = fopen(AFILE, "r");
663
} else {
664
conffp = fopen(argfile, "r");
665
}
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
452
fprintf(stderr, "Unknown error while parsing arguments\n");
453
exitstatus = EXIT_FAILURE;
454
goto fallback;
455
}
456
457
conffp = fopen(argfile, "r");
666
458
if(conffp != NULL){
667
459
char *org_line = NULL;
668
460
char *p, *arg, *new_arg, *line;
669
461
size_t size = 0;
462
ssize_t sret;
670
463
const char whitespace_delims[] = " \r\t\f\v\n";
671
464
const char comment_delim[] = "#";
672
673
custom_argc = 1;
674
custom_argv = malloc(sizeof(char*) * 2);
675
if(custom_argv == NULL){
676
error(0, errno, "malloc");
677
exitstatus = EX_OSERR;
678
goto fallback;
679
}
680
custom_argv[0] = argv[0];
681
custom_argv[1] = NULL;
682
683
/* for each line in the config file, strip whitespace and ignore
684
commented text */
465
685
466
while(true){
686
467
sret = getline(&org_line, &size, conffp);
687
468
if(sret == -1){
688
469
break;
689
470
}
690
471
691
472
line = org_line;
692
473
arg = strsep(&line, comment_delim);
693
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
695
476
continue;
696
477
}
697
478
new_arg = strdup(p);
698
if(new_arg == NULL){
699
error(0, errno, "strdup");
700
exitstatus = EX_OSERR;
701
free(org_line);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
702
483
goto fallback;
703
484
}
704
705
custom_argc += 1;
706
{
707
char **new_argv = realloc(custom_argv, sizeof(char *)
708
* ((size_t)custom_argc + 1));
709
if(new_argv == NULL){
710
error(0, errno, "realloc");
711
exitstatus = EX_OSERR;
712
free(new_arg);
713
free(org_line);
714
goto fallback;
715
} else {
716
custom_argv = new_argv;
717
}
718
}
719
custom_argv[custom_argc-1] = new_arg;
720
custom_argv[custom_argc] = NULL;
721
485
}
722
486
}
723
do {
724
ret = fclose(conffp);
725
} while(ret == EOF and errno == EINTR);
726
if(ret == EOF){
727
error(0, errno, "fclose");
728
exitstatus = EX_IOERR;
729
goto fallback;
730
}
731
487
free(org_line);
732
} else {
488
} else{
733
489
/* Check for harmful errors and go to fallback. Other errors might
734
490
not affect opening plugins */
735
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
736
error(0, errno, "fopen");
737
exitstatus = EX_OSERR;
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
perror("fopen");
493
exitstatus = EXIT_FAILURE;
738
494
goto fallback;
739
495
}
740
496
}
741
/* If there were any arguments from the configuration file, pass
742
them to parser as command line arguments */
497
743
498
if(custom_argv != NULL){
744
ret = argp_parse(&argp, custom_argc, custom_argv,
745
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
746
NULL, NULL);
747
switch(ret){
748
case 0:
749
break;
750
case ENOMEM:
751
default:
752
errno = ret;
753
error(0, errno, "argp_parse");
754
exitstatus = EX_OSERR;
755
goto fallback;
756
case EINVAL:
757
exitstatus = EX_CONFIG;
758
goto fallback;
759
}
760
}
761
762
/* Parse actual command line arguments, to let them override the
763
config file */
764
ret = argp_parse(&argp, argc, argv,
765
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
766
NULL, NULL);
767
switch(ret){
768
case 0:
769
break;
770
case ENOMEM:
771
default:
772
errno = ret;
773
error(0, errno, "argp_parse");
774
exitstatus = EX_OSERR;
775
goto fallback;
776
case EINVAL:
777
exitstatus = EX_USAGE;
778
goto fallback;
779
}
780
781
{
782
char *pluginhelperenv;
783
bool bret = true;
784
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
785
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
786
if(ret != -1){
787
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
788
}
789
if(ret == -1 or not bret){
790
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
791
" environment variable to \"%s\" for all plugins\n",
792
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
793
}
794
if(ret != -1){
795
free(pluginhelperenv);
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
502
fprintf(stderr, "Unknown error while parsing arguments\n");
503
exitstatus = EXIT_FAILURE;
504
goto fallback;
796
505
}
797
506
}
798
507
799
508
if(debug){
800
for(plugin *p = plugin_list; p != NULL; p = p->next){
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
801
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
802
511
p->name ? p->name : "Global", p->argc - 1);
803
512
for(char **a = p->argv; *a != NULL; a++){
804
513
fprintf(stderr, "\tArg: %s\n", *a);
805
514
}
806
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
807
516
for(char **a = p->environ; *a != NULL; a++){
808
517
fprintf(stderr, "\t%s\n", *a);
809
518
}
810
519
}
811
520
}
812
521
813
if(getuid() == 0){
814
/* Work around Debian bug #633582:
815
<https://bugs.debian.org/633582> */
816
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
817
if(plugindir_fd == -1){
818
if(errno != ENOENT){
819
error(0, errno, "open(\"" PDIR "\")");
820
}
821
} else {
822
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
823
if(ret == -1){
824
error(0, errno, "fstat");
825
} else {
826
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
827
ret = fchown(plugindir_fd, uid, gid);
828
if(ret == -1){
829
error(0, errno, "fchown");
830
}
831
}
832
}
833
close(plugindir_fd);
834
}
835
}
836
837
/* Lower permissions */
838
ret = setgid(gid);
839
if(ret == -1){
840
error(0, errno, "setgid");
841
}
842
522
ret = setuid(uid);
843
if(ret == -1){
844
error(0, errno, "setuid");
845
}
846
847
/* Open plugin directory with close_on_exec flag */
523
if (ret == -1){
524
perror("setuid");
525
}
526
527
setgid(gid);
528
if (ret == -1){
529
perror("setgid");
530
}
531
532
dir = opendir(plugindir);
533
if(dir == NULL){
534
perror("Could not open plugin dir");
535
exitstatus = EXIT_FAILURE;
536
goto fallback;
537
}
538
539
/* Set the FD_CLOEXEC flag on the directory, if possible */
848
540
{
849
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
850
#ifdef O_CLOEXEC
851
O_CLOEXEC
852
#else /* not O_CLOEXEC */
853
0
854
#endif /* not O_CLOEXEC */
855
);
856
if(dir_fd == -1){
857
error(0, errno, "Could not open plugin dir");
858
exitstatus = EX_UNAVAILABLE;
859
goto fallback;
860
}
861
862
#ifndef O_CLOEXEC
863
/* Set the FD_CLOEXEC flag on the directory */
864
ret = set_cloexec_flag(dir_fd);
865
if(ret < 0){
866
error(0, errno, "set_cloexec_flag");
867
exitstatus = EX_OSERR;
868
goto fallback;
869
}
870
#endif /* O_CLOEXEC */
871
}
872
873
int good_name(const struct dirent * const dirent){
874
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
875
"*.dpkg-old", "*.dpkg-bak",
876
"*.dpkg-divert", NULL };
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pat = (const char **)patterns;
882
*pat != NULL; pat++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
886
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
887
!= FNM_NOMATCH){
888
if(debug){
889
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
890
" matching pattern %s\n", dirent->d_name, *pat);
891
}
892
return 0;
541
int dir_fd = dirfd(dir);
542
if(dir_fd >= 0){
543
ret = set_cloexec_flag(dir_fd);
544
if(ret < 0){
545
perror("set_cloexec_flag");
546
exitstatus = EXIT_FAILURE;
547
goto fallback;
893
548
}
894
549
}
895
return 1;
896
}
897
898
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
899
alphasort);
900
if(numplugins == -1){
901
error(0, errno, "Could not scan plugin dir");
902
direntries = NULL;
903
exitstatus = EX_OSERR;
904
goto fallback;
905
550
}
906
551
907
552
FD_ZERO(&rfds_all);
908
553
909
/* Read and execute any executable in the plugin directory*/
910
for(int i = 0; i < numplugins; i++){
911
912
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
913
if(plugin_fd == -1){
914
error(0, errno, "Could not open plugin");
915
free(direntries[i]);
916
continue;
917
}
918
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
919
if(ret == -1){
920
error(0, errno, "stat");
921
close(plugin_fd);
922
free(direntries[i]);
923
continue;
924
}
925
926
/* Ignore non-executable files */
927
if(not S_ISREG(st.st_mode)
928
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
929
X_OK, 0)) != 0)){
554
while(true){
555
dirst = readdir(dir);
556
557
// All directory entries have been processed
558
if(dirst == NULL){
559
if (errno == EBADF){
560
perror("readdir");
561
exitstatus = EXIT_FAILURE;
562
goto fallback;
563
}
564
break;
565
}
566
567
d_name_len = strlen(dirst->d_name);
568
569
// Ignore dotfiles, backup files and other junk
570
{
571
bool bad_name = false;
572
573
const char const *bad_prefixes[] = { ".", "#", NULL };
574
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
".dpkg-old",
577
".dpkg-divert", NULL };
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
size_t pre_len = strlen(*pre);
580
if((d_name_len >= pre_len)
581
and strncmp((dirst->d_name), *pre, pre_len) == 0){
582
if(debug){
583
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
584
" with bad prefix %s\n", dirst->d_name, *pre);
585
}
586
bad_name = true;
587
break;
588
}
589
}
590
591
if(bad_name){
592
continue;
593
}
594
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
size_t suf_len = strlen(*suf);
597
if((d_name_len >= suf_len)
598
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
599
== 0)){
600
if(debug){
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
602
" with bad suffix %s\n", dirst->d_name, *suf);
603
}
604
bad_name = true;
605
break;
606
}
607
}
608
609
if(bad_name){
610
continue;
611
}
612
}
613
614
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
616
if(ret < 0){
617
perror("asprintf");
618
continue;
619
}
620
621
ret = stat(filename, &st);
622
if (ret == -1){
623
perror("stat");
624
free(filename);
625
continue;
626
}
627
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
930
629
if(debug){
931
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
932
" with bad type or mode\n",
933
plugindir != NULL ? plugindir : PDIR,
934
direntries[i]->d_name);
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
" with bad type or mode\n", filename);
935
632
}
936
close(plugin_fd);
937
free(direntries[i]);
633
free(filename);
938
634
continue;
939
635
}
940
941
plugin *p = getplugin(direntries[i]->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
942
637
if(p == NULL){
943
error(0, errno, "getplugin");
944
close(plugin_fd);
945
free(direntries[i]);
638
perror("getplugin");
639
free(filename);
946
640
continue;
947
641
}
948
642
if(p->disabled){
949
643
if(debug){
950
644
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
951
direntries[i]->d_name);
645
dirst->d_name);
952
646
}
953
close(plugin_fd);
954
free(direntries[i]);
647
free(filename);
955
648
continue;
956
649
}
957
650
{
958
651
/* Add global arguments to argument list for this plugin */
959
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
960
653
if(g != NULL){
961
654
for(char **a = g->argv + 1; *a != NULL; a++){
962
655
if(not add_argument(p, *a)){
963
error(0, errno, "add_argument");
656
perror("add_argument");
964
657
}
965
658
}
966
659
/* Add global environment variables */
967
660
for(char **e = g->environ; *e != NULL; e++){
968
if(not add_environment(p, *e, false)){
969
error(0, errno, "add_environment");
661
if(not add_environment(p, *e)){
662
perror("add_environment");
970
663
}
971
664
}
972
665
}
973
666
}
974
/* If this plugin has any environment variables, we need to
975
duplicate the environment from this process, too. */
667
/* If this plugin has any environment variables, we will call
668
using execve and need to duplicate the environment from this
669
process, too. */
976
670
if(p->environ[0] != NULL){
977
671
for(char **e = environ; *e != NULL; e++){
978
if(not add_environment(p, *e, false)){
979
error(0, errno, "add_environment");
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
678
perror("add_environment");
980
679
}
981
680
}
982
681
}
983
682
984
int pipefd[2];
985
#ifndef O_CLOEXEC
986
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
987
#else /* O_CLOEXEC */
988
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
989
#endif /* O_CLOEXEC */
990
if(ret == -1){
991
error(0, errno, "pipe");
992
exitstatus = EX_OSERR;
993
free(direntries[i]);
994
goto fallback;
995
}
996
if(pipefd[0] >= FD_SETSIZE){
997
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
998
FD_SETSIZE);
999
close(pipefd[0]);
1000
close(pipefd[1]);
1001
exitstatus = EX_OSERR;
1002
free(direntries[i]);
1003
goto fallback;
1004
}
1005
#ifndef O_CLOEXEC
1006
/* Ask OS to automatic close the pipe on exec */
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
686
perror("pipe");
687
exitstatus = EXIT_FAILURE;
688
goto fallback;
689
}
1007
690
ret = set_cloexec_flag(pipefd[0]);
1008
691
if(ret < 0){
1009
error(0, errno, "set_cloexec_flag");
1010
close(pipefd[0]);
1011
close(pipefd[1]);
1012
exitstatus = EX_OSERR;
1013
free(direntries[i]);
692
perror("set_cloexec_flag");
693
exitstatus = EXIT_FAILURE;
1014
694
goto fallback;
1015
695
}
1016
696
ret = set_cloexec_flag(pipefd[1]);
1017
697
if(ret < 0){
1018
error(0, errno, "set_cloexec_flag");
1019
close(pipefd[0]);
1020
close(pipefd[1]);
1021
exitstatus = EX_OSERR;
1022
free(direntries[i]);
698
perror("set_cloexec_flag");
699
exitstatus = EXIT_FAILURE;
1023
700
goto fallback;
1024
701
}
1025
#endif /* not O_CLOEXEC */
1026
702
/* Block SIGCHLD until process is safely in process list */
1027
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1028
&sigchld_action.sa_mask,
1029
NULL));
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1030
704
if(ret < 0){
1031
error(0, errno, "sigprocmask");
1032
exitstatus = EX_OSERR;
1033
free(direntries[i]);
705
perror("sigprocmask");
706
exitstatus = EXIT_FAILURE;
1034
707
goto fallback;
1035
708
}
1036
/* Starting a new process to be watched */
1037
pid_t pid;
1038
do {
1039
pid = fork();
1040
} while(pid == -1 and errno == EINTR);
709
// Starting a new process to be watched
710
pid_t pid = fork();
1041
711
if(pid == -1){
1042
error(0, errno, "fork");
1043
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1044
&sigchld_action.sa_mask, NULL));
1045
close(pipefd[0]);
1046
close(pipefd[1]);
1047
exitstatus = EX_OSERR;
1048
free(direntries[i]);
712
perror("fork");
713
exitstatus = EXIT_FAILURE;
1049
714
goto fallback;
1050
715
}
1051
716
if(pid == 0){
1052
717
/* this is the child process */
1053
718
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1054
719
if(ret < 0){
1055
error(0, errno, "sigaction");
1056
_exit(EX_OSERR);
720
perror("sigaction");
721
_exit(EXIT_FAILURE);
1057
722
}
1058
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
724
if(ret < 0){
1060
error(0, errno, "sigprocmask");
1061
_exit(EX_OSERR);
725
perror("sigprocmask");
726
_exit(EXIT_FAILURE);
1062
727
}
1063
728
1064
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1065
730
if(ret == -1){
1066
error(0, errno, "dup2");
1067
_exit(EX_OSERR);
731
perror("dup2");
732
_exit(EXIT_FAILURE);
1068
733
}
1069
734
1070
if(fexecve(plugin_fd, p->argv,
1071
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1072
error(0, errno, "fexecve for %s/%s",
1073
plugindir != NULL ? plugindir : PDIR,
1074
direntries[i]->d_name);
1075
_exit(EX_OSERR);
735
if(dirfd(dir) < 0){
736
/* If dir has no file descriptor, we could not set FD_CLOEXEC
737
above and must now close it manually here. */
738
closedir(dir);
739
}
740
if(p->environ[0] == NULL){
741
if(execv(filename, p->argv) < 0){
742
perror("execv");
743
_exit(EXIT_FAILURE);
744
}
745
} else {
746
if(execve(filename, p->argv, p->environ) < 0){
747
perror("execve");
748
_exit(EXIT_FAILURE);
749
}
1076
750
}
1077
751
/* no return */
1078
752
}
1079
/* Parent process */
1080
close(pipefd[1]); /* Close unused write end of pipe */
1081
close(plugin_fd);
1082
plugin *new_plugin = getplugin(direntries[i]->d_name);
1083
if(new_plugin == NULL){
1084
error(0, errno, "getplugin");
1085
ret = (int)(TEMP_FAILURE_RETRY
1086
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1087
NULL)));
753
/* parent process */
754
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1088
760
if(ret < 0){
1089
error(0, errno, "sigprocmask");
761
perror("sigprocmask");
1090
762
}
1091
exitstatus = EX_OSERR;
1092
free(direntries[i]);
763
exitstatus = EXIT_FAILURE;
1093
764
goto fallback;
1094
765
}
1095
free(direntries[i]);
1096
766
1097
new_plugin->pid = pid;
1098
new_plugin->fd = pipefd[0];
1099
1100
if(debug){
1101
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1102
new_plugin->name, (intmax_t) (new_plugin->pid));
1103
}
1104
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
1105
772
/* Unblock SIGCHLD so signal handler can be run if this process
1106
773
has already completed */
1107
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1108
&sigchld_action.sa_mask,
1109
NULL));
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1110
775
if(ret < 0){
1111
error(0, errno, "sigprocmask");
1112
exitstatus = EX_OSERR;
776
perror("sigprocmask");
777
exitstatus = EXIT_FAILURE;
1113
778
goto fallback;
1114
779
}
1115
780
1116
FD_SET(new_plugin->fd, &rfds_all);
1117
1118
if(maxfd < new_plugin->fd){
1119
maxfd = new_plugin->fd;
1120
}
1121
}
1122
1123
free(direntries);
1124
direntries = NULL;
1125
close(dir_fd);
1126
dir_fd = -1;
1127
free_plugin(getplugin(NULL));
1128
1129
for(plugin *p = plugin_list; p != NULL; p = p->next){
1130
if(p->pid != 0){
1131
break;
1132
}
1133
if(p->next == NULL){
1134
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1135
" directory?\n");
1136
free_plugin_list();
1137
}
1138
}
1139
1140
/* Main loop while running plugins exist */
1141
while(plugin_list){
781
FD_SET(new_process->fd, &rfds_all);
782
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
785
}
786
787
}
788
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
792
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
798
}
799
while(process_list){
1142
800
fd_set rfds = rfds_all;
1143
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1144
if(select_ret == -1 and errno != EINTR){
1145
error(0, errno, "select");
1146
exitstatus = EX_OSERR;
802
if (select_ret == -1){
803
perror("select");
804
exitstatus = EXIT_FAILURE;
1147
805
goto fallback;
1148
806
}
1149
807
/* OK, now either a process completed, or something can be read
1150
808
from one of them */
1151
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
1152
810
/* Is this process completely done? */
1153
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
1154
812
/* Only accept the plugin output if it exited cleanly */
1155
813
if(not WIFEXITED(proc->status)
1156
814
or WEXITSTATUS(proc->status) != 0){
1157
815
/* Bad exit by plugin */
1158
1159
816
if(debug){
1160
817
if(WIFEXITED(proc->status)){
1161
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1162
" status %d\n", proc->name,
1163
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1164
820
WEXITSTATUS(proc->status));
1165
} else if(WIFSIGNALED(proc->status)){
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1167
" signal %d: %s\n", proc->name,
1168
(intmax_t) (proc->pid),
1169
WTERMSIG(proc->status),
1170
strsignal(WTERMSIG(proc->status)));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
825
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1171
828
}
1172
829
}
1173
1174
830
/* Remove the plugin */
1175
831
FD_CLR(proc->fd, &rfds_all);
1176
1177
832
/* Block signal while modifying process_list */
1178
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1179
(SIG_BLOCK,
1180
&sigchld_action.sa_mask,
1181
NULL));
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
834
if(ret < 0){
1183
error(0, errno, "sigprocmask");
1184
exitstatus = EX_OSERR;
835
perror("sigprocmask");
836
exitstatus = EXIT_FAILURE;
1185
837
goto fallback;
1186
838
}
1187
1188
plugin *next_plugin = proc->next;
1189
free_plugin(proc);
1190
proc = next_plugin;
1191
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1192
852
/* We are done modifying process list, so unblock signal */
1193
ret = (int)(TEMP_FAILURE_RETRY
1194
(sigprocmask(SIG_UNBLOCK,
1195
&sigchld_action.sa_mask, NULL)));
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1196
855
if(ret < 0){
1197
error(0, errno, "sigprocmask");
1198
exitstatus = EX_OSERR;
1199
goto fallback;
1200
}
1201
1202
if(plugin_list == NULL){
1203
break;
1204
}
1205
1206
continue;
856
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1207
864
}
1208
1209
865
/* This process exited nicely, so print its buffer */
1210
1211
bool bret = print_out_password(proc->buffer,
1212
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1213
868
if(not bret){
1214
error(0, errno, "print_out_password");
1215
exitstatus = EX_IOERR;
869
perror("print_out_password");
870
exitstatus = EXIT_FAILURE;
1216
871
}
1217
872
goto fallback;
1218
873
}
1219
1220
874
/* This process has not completed. Does it have any output? */
1221
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1222
876
/* This process had nothing to say at this time */
1223
proc = proc->next;
1224
877
continue;
1225
878
}
1226
879
/* Before reading, make the process' data buffer large enough */
1227
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1228
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1229
+ (size_t) BUFFER_SIZE);
1230
if(new_buffer == NULL){
1231
error(0, errno, "malloc");
1232
exitstatus = EX_OSERR;
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
884
perror("malloc");
885
exitstatus = EXIT_FAILURE;
1233
886
goto fallback;
1234
887
}
1235
proc->buffer = new_buffer;
1236
888
proc->buffer_size += BUFFER_SIZE;
1237
889
}
1238
890
/* Read from the process */
1239
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1240
proc->buffer
1241
+ proc->buffer_length,
1242
BUFFER_SIZE));
1243
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1244
894
/* Read error from this process; ignore the error */
1245
proc = proc->next;
1246
895
continue;
1247
896
}
1248
if(sret == 0){
897
if(ret == 0){
1249
898
/* got EOF */
1250
899
proc->eof = true;
1251
900
} else {
1252
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1253
902
}
1254
903
}
1255
904
}
1256
1257
905
906
1258
907
fallback:
1259
908
1260
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1261
and exitstatus != EX_OK)){
1262
/* Fallback if all plugins failed, none are found or an error
1263
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1264
911
bool bret;
1265
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1266
913
char *passwordbuffer = getpass("Password: ");
1267
size_t len = strlen(passwordbuffer);
1268
/* Strip trailing newline */
1269
if(len > 0 and passwordbuffer[len-1] == '\n'){
1270
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1271
len--;
1272
}
1273
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1274
915
if(not bret){
1275
error(0, errno, "print_out_password");
1276
exitstatus = EX_IOERR;
916
perror("print_out_password");
917
exitstatus = EXIT_FAILURE;
1277
918
}
1278
919
}
1279
920
1280
921
/* Restore old signal handler */
1281
922
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1282
923
if(ret == -1){
1283
error(0, errno, "sigaction");
1284
exitstatus = EX_OSERR;
924
perror("sigaction");
925
exitstatus = EXIT_FAILURE;
1285
926
}
1286
927
1287
928
if(custom_argv != NULL){
1288
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1289
930
free(*arg);
1290
931
}
1291
932
free(custom_argv);
1292
933
}
1293
1294
free(direntries);
1295
1296
if(dir_fd != -1){
1297
close(dir_fd);
934
free_plugin_list(plugin_list);
935
936
if(dir != NULL){
937
closedir(dir);
1298
938
}
1299
939
1300
/* Kill the processes */
1301
for(plugin *p = plugin_list; p != NULL; p = p->next){
1302
if(p->pid != 0){
1303
close(p->fd);
1304
ret = kill(p->pid, SIGTERM);
1305
if(ret == -1 and errno != ESRCH){
1306
/* Set-uid proccesses might not get closed */
1307
error(0, errno, "kill");
1308
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1309
948
}
949
free(process_list->buffer);
950
free(process_list);
1310
951
}
1311
952
1312
953
/* Wait for any remaining child processes to terminate */
1313
do {
954
do{
1314
955
ret = wait(NULL);
1315
956
} while(ret >= 0);
1316
957
if(errno != ECHILD){
1317
error(0, errno, "wait");
958
perror("wait");
1318
959
}
1319
960
1320
free_plugin_list();
1321
1322
free(plugindir);
1323
free(pluginhelperdir);
1324
free(argfile);
1325
1326
961
return exitstatus;
1327
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0