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- Committer: Teddy Hogeborn
- Date: 2019-07-29 16:35:53 UTC
- Revision ID: teddy@recompile.se-20190729163553-1i442i2cbx64c537
Make tests and man page examples match
Make the tests test_manual_page_example[1-5] match exactly what is
written in the manual page, and add comments to manual page as
reminders to keep tests and manual page examples in sync.
* mandos-ctl (Test_commands_from_options.test_manual_page_example_1):
Remove "--verbose" option, since the manual does not have it as the
first example, and change assertion to match.
* mandos-ctl.xml (EXAMPLE): Add comments to all examples documenting
which test function they correspond to. Also remove unnecessary
quotes from option arguments in fourth example, and clarify language
slightly in fifth example.
Make the tests test_manual_page_example[1-5] match exactly what is
written in the manual page, and add comments to manual page as
reminders to keep tests and manual page examples in sync.
* mandos-ctl (Test_commands_from_options.test_manual_page_example_1):
Remove "--verbose" option, since the manual does not have it as the
first example, and change assertion to match.
* mandos-ctl.xml (EXAMPLE): Add comments to all examples documenting
which test function they correspond to. Also remove unnecessary
quotes from option arguments in fourth example, and clarify language
slightly in fifth example.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
27
O_CLOEXEC, pipe2() */
26
28
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
30
realloc() */
29
31
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
32
#include <stdio.h> /* fileno(), fprintf(),
33
stderr, STDOUT_FILENO, fclose() */
34
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
35
WIFEXITED(), WEXITSTATUS(), wait(),
36
pid_t, uid_t, gid_t, getuid(),
37
getgid() */
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
41
WEXITSTATUS(), WTERMSIG() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
43
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
55
57
#include <errno.h> /* errno */
56
58
#include <argp.h> /* struct argp_option, struct
57
59
argp_state, struct argp,
61
63
#include <signal.h> /* struct sigaction, sigemptyset(),
62
64
sigaddset(), sigaction(),
63
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
65
68
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
70
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
81
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
88
84
89
85
typedef struct plugin{
90
86
char *name; /* can be NULL or any plugin name */
93
89
char **environ;
94
90
int envc;
95
91
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;
96
102
struct plugin *next;
97
103
} plugin;
98
104
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
103
115
return p;
104
116
}
105
117
}
106
118
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
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){
109
124
return NULL;
110
125
}
111
126
char *copy_name = NULL;
112
127
if(name != NULL){
113
copy_name = strdup(name);
128
do {
129
copy_name = strdup(name);
130
} while(copy_name == NULL and errno == EINTR);
114
131
if(copy_name == NULL){
132
int e = errno;
133
free(new_plugin);
134
errno = e;
115
135
return NULL;
116
136
}
117
137
}
118
138
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
139
*new_plugin = (plugin){ .name = copy_name,
140
.argc = 1,
141
.disabled = false,
142
.next = plugin_list };
124
143
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
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;
127
149
free(copy_name);
128
150
free(new_plugin);
151
errno = e;
129
152
return NULL;
130
153
}
131
154
new_plugin->argv[0] = copy_name;
132
155
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
135
160
if(new_plugin->environ == NULL){
161
int e = errno;
136
162
free(copy_name);
137
163
free(new_plugin->argv);
138
164
free(new_plugin);
165
errno = e;
139
166
return NULL;
140
167
}
141
168
new_plugin->environ[0] = NULL;
169
142
170
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
144
172
return new_plugin;
145
173
}
146
174
147
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
148
177
static bool add_to_char_array(const char *new, char ***array,
149
178
int *len){
150
179
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
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);
153
185
/* Malloc check */
154
if(*array == NULL){
186
if(new_array == NULL){
155
187
return false;
156
188
}
189
*array = new_array;
157
190
/* Make a copy of the new string */
158
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
159
195
if(copy == NULL){
160
196
return false;
161
197
}
168
204
}
169
205
170
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
171
208
static bool add_argument(plugin *p, const char *arg){
172
209
if(p == NULL){
173
210
return false;
176
213
}
177
214
178
215
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
180
218
if(p == NULL){
181
219
return false;
182
220
}
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
}
183
241
return add_to_char_array(def, &(p->environ), &(p->envc));
184
242
}
185
243
186
244
#ifndef O_CLOEXEC
187
245
/*
188
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
247
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
249
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
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));
195
253
/* If reading the flags failed, return error indication now. */
196
254
if(ret < 0){
197
255
return ret;
198
256
}
199
257
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
201
260
}
261
#endif /* not O_CLOEXEC */
202
262
203
process *process_list = NULL;
204
263
205
264
/* Mark processes as completed when they exit, and save their exit
206
265
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
208
268
while(true){
209
process *proc = process_list;
269
plugin *proc = plugin_list;
210
270
int status;
211
271
pid_t pid = waitpid(-1, &status, WNOHANG);
212
272
if(pid == 0){
214
274
break;
215
275
}
216
276
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
219
280
}
220
/* No child processes */
221
break;
281
error(0, errno, "waitpid");
222
282
}
223
283
224
284
/* A child exited, find it in process_list */
225
285
while(proc != NULL and proc->pid != pid){
226
286
proc = proc->next;
230
290
continue;
231
291
}
232
292
proc->status = status;
233
proc->completed = true;
293
proc->completed = 1;
234
294
}
295
errno = old_errno;
235
296
}
236
297
237
bool print_out_password(const char *buffer, size_t length){
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){
238
301
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
302
for(size_t written = 0; written < length; written += (size_t)ret){
243
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
304
length - written));
249
309
return true;
250
310
}
251
311
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
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
}
338
}
339
}
340
341
free(plugin_node);
342
}
343
344
static void free_plugin_list(void){
345
while(plugin_list != NULL){
346
free_plugin(plugin_list);
264
347
}
265
348
}
266
349
267
350
int main(int argc, char *argv[]){
268
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
269
353
char *argfile = NULL;
270
354
FILE *conffp;
271
size_t d_name_len;
272
DIR *dir = NULL;
273
struct dirent *dirst;
355
struct dirent **direntries = NULL;
274
356
struct stat st;
275
357
fd_set rfds_all;
276
358
int ret, maxfd = 0;
359
ssize_t sret;
277
360
uid_t uid = 65534;
278
361
gid_t gid = 65534;
279
362
bool debug = false;
283
366
.sa_flags = SA_NOCLDSTOP };
284
367
char **custom_argv = NULL;
285
368
int custom_argc = 0;
369
int dir_fd = -1;
286
370
287
371
/* Establish a signal handler */
288
372
sigemptyset(&sigchld_action.sa_mask);
289
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
374
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
293
377
goto fallback;
294
378
}
295
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
380
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
299
383
goto fallback;
300
384
}
301
385
304
388
{ .name = "global-options", .key = 'g',
305
389
.arg = "OPTION[,OPTION[,...]]",
306
390
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
391
{ .name = "global-env", .key = 'G',
308
392
.arg = "VAR=value",
309
393
.doc = "Environment variable passed to all plugins" },
310
394
{ .name = "options-for", .key = 'o',
311
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
396
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
314
398
.arg = "PLUGIN:ENV=value",
315
399
.doc = "Environment variable passed to specified plugin" },
316
400
{ .name = "disable", .key = 'd',
317
401
.arg = "PLUGIN",
318
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
319
406
{ .name = "plugin-dir", .key = 128,
320
407
.arg = "DIRECTORY",
321
408
.doc = "Specify a different plugin directory", .group = 2 },
330
417
.doc = "Group ID the plugins will run as", .group = 3 },
331
418
{ .name = "debug", .key = 132,
332
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 },
333
433
{ .name = NULL }
334
434
};
335
435
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
}
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 */
397
483
{
398
484
char *envdef = strchr(arg, ':');
399
485
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
406
491
envdef++;
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:
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);
422
522
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
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 */
553
debug = true;
554
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
#if __GNUC__ >= 7
590
__attribute__((fallthrough));
591
#else
592
/* FALLTHROUGH */
593
#endif
594
default:
595
return ARGP_ERR_UNKNOWN;
596
}
597
return errno; /* Set to 0 at start */
598
}
599
600
/* This option parser is the same as parse_opt() above, except it
601
ignores everything but the --config-file option. */
602
error_t parse_opt_config_file(int key, char *arg,
603
__attribute__((unused))
604
struct argp_state *state){
605
errno = 0;
606
switch(key){
607
case 'g': /* --global-options */
608
case 'G': /* --global-env */
609
case 'o': /* --options-for */
610
case 'E': /* --env-for */
611
case 'd': /* --disable */
612
case 'e': /* --enable */
613
case 128: /* --plugin-dir */
614
break;
615
case 129: /* --config-file */
616
free(argfile);
428
617
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
618
if(argfile != NULL){
619
errno = 0;
431
620
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
440
debug = true;
441
break;
621
break;
622
case 130: /* --userid */
623
case 131: /* --groupid */
624
case 132: /* --debug */
625
case 133: /* --plugin-helper-dir */
626
case '?': /* --help */
627
case -3: /* --usage */
628
case 'V': /* --version */
442
629
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
630
break;
447
631
default:
448
632
return ARGP_ERR_UNKNOWN;
449
633
}
450
return 0;
634
return errno;
451
635
}
452
636
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
457
640
.doc = "Mandos plugin runner -- Run plugins" };
458
641
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
642
/* Parse using parse_opt_config_file() in order to get the custom
643
config file location, if any. */
644
ret = argp_parse(&argp, argc, argv,
645
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
646
NULL, NULL);
647
switch(ret){
648
case 0:
649
break;
650
case ENOMEM:
651
default:
652
errno = ret;
653
error(0, errno, "argp_parse");
654
exitstatus = EX_OSERR;
655
goto fallback;
656
case EINVAL:
657
exitstatus = EX_USAGE;
463
658
goto fallback;
464
659
}
465
466
if (argfile == NULL){
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
467
666
conffp = fopen(AFILE, "r");
468
667
} else {
469
668
conffp = fopen(argfile, "r");
470
669
}
471
472
670
if(conffp != NULL){
473
671
char *org_line = NULL;
474
672
char *p, *arg, *new_arg, *line;
475
673
size_t size = 0;
476
ssize_t sret;
477
674
const char whitespace_delims[] = " \r\t\f\v\n";
478
675
const char comment_delim[] = "#";
479
676
480
677
custom_argc = 1;
481
678
custom_argv = malloc(sizeof(char*) * 2);
482
679
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
485
682
goto fallback;
486
683
}
487
684
custom_argv[0] = argv[0];
488
685
custom_argv[1] = NULL;
489
686
687
/* for each line in the config file, strip whitespace and ignore
688
commented text */
490
689
while(true){
491
690
sret = getline(&org_line, &size, conffp);
492
691
if(sret == -1){
493
692
break;
494
693
}
495
694
496
695
line = org_line;
497
696
arg = strsep(&line, comment_delim);
498
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
501
700
}
502
701
new_arg = strdup(p);
503
702
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
506
705
free(org_line);
507
706
goto fallback;
508
707
}
509
708
510
709
custom_argc += 1;
511
custom_argv = realloc(custom_argv, sizeof(char *)
512
* ((unsigned int) custom_argc + 1));
513
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
516
free(org_line);
517
goto fallback;
710
{
711
char **new_argv = realloc(custom_argv, sizeof(char *)
712
* ((size_t)custom_argc + 1));
713
if(new_argv == NULL){
714
error(0, errno, "realloc");
715
exitstatus = EX_OSERR;
716
free(new_arg);
717
free(org_line);
718
goto fallback;
719
} else {
720
custom_argv = new_argv;
721
}
518
722
}
519
723
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
724
custom_argv[custom_argc] = NULL;
521
725
}
522
726
}
727
do {
728
ret = fclose(conffp);
729
} while(ret == EOF and errno == EINTR);
730
if(ret == EOF){
731
error(0, errno, "fclose");
732
exitstatus = EX_IOERR;
733
goto fallback;
734
}
523
735
free(org_line);
524
} else{
736
} else {
525
737
/* Check for harmful errors and go to fallback. Other errors might
526
738
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
530
742
goto fallback;
531
743
}
532
744
}
533
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
534
747
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
539
goto fallback;
748
ret = argp_parse(&argp, custom_argc, custom_argv,
749
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
750
NULL, NULL);
751
switch(ret){
752
case 0:
753
break;
754
case ENOMEM:
755
default:
756
errno = ret;
757
error(0, errno, "argp_parse");
758
exitstatus = EX_OSERR;
759
goto fallback;
760
case EINVAL:
761
exitstatus = EX_CONFIG;
762
goto fallback;
763
}
764
}
765
766
/* Parse actual command line arguments, to let them override the
767
config file */
768
ret = argp_parse(&argp, argc, argv,
769
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
770
NULL, NULL);
771
switch(ret){
772
case 0:
773
break;
774
case ENOMEM:
775
default:
776
errno = ret;
777
error(0, errno, "argp_parse");
778
exitstatus = EX_OSERR;
779
goto fallback;
780
case EINVAL:
781
exitstatus = EX_USAGE;
782
goto fallback;
783
}
784
785
{
786
char *pluginhelperenv;
787
bool bret = true;
788
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
789
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
790
if(ret != -1){
791
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
792
}
793
if(ret == -1 or not bret){
794
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
795
" environment variable to \"%s\" for all plugins\n",
796
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
797
}
798
if(ret != -1){
799
free(pluginhelperenv);
540
800
}
541
801
}
542
802
543
803
if(debug){
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
545
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
546
806
p->name ? p->name : "Global", p->argc - 1);
547
807
for(char **a = p->argv; *a != NULL; a++){
548
808
fprintf(stderr, "\tArg: %s\n", *a);
549
809
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
811
for(char **a = p->environ; *a != NULL; a++){
552
812
fprintf(stderr, "\t%s\n", *a);
553
813
}
554
814
}
555
815
}
556
816
817
if(getuid() == 0){
818
/* Work around Debian bug #633582:
819
<https://bugs.debian.org/633582> */
820
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
821
if(plugindir_fd == -1){
822
if(errno != ENOENT){
823
error(0, errno, "open(\"" PDIR "\")");
824
}
825
} else {
826
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
827
if(ret == -1){
828
error(0, errno, "fstat");
829
} else {
830
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
831
ret = fchown(plugindir_fd, uid, gid);
832
if(ret == -1){
833
error(0, errno, "fchown");
834
}
835
}
836
}
837
close(plugindir_fd);
838
}
839
}
840
841
/* Lower permissions */
842
ret = setgid(gid);
843
if(ret == -1){
844
error(0, errno, "setgid");
845
}
557
846
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
847
if(ret == -1){
848
error(0, errno, "setuid");
849
}
850
851
/* Open plugin directory with close_on_exec flag */
580
852
{
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
853
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
854
#ifdef O_CLOEXEC
855
O_CLOEXEC
856
#else /* not O_CLOEXEC */
857
0
858
#endif /* not O_CLOEXEC */
859
);
860
if(dir_fd == -1){
861
error(0, errno, "Could not open plugin dir");
862
exitstatus = EX_UNAVAILABLE;
863
goto fallback;
864
}
865
866
#ifndef O_CLOEXEC
867
/* Set the FD_CLOEXEC flag on the directory */
868
ret = set_cloexec_flag(dir_fd);
869
if(ret < 0){
870
error(0, errno, "set_cloexec_flag");
871
exitstatus = EX_OSERR;
872
goto fallback;
873
}
874
#endif /* O_CLOEXEC */
875
}
876
877
int good_name(const struct dirent * const dirent){
878
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
879
"*.dpkg-old", "*.dpkg-bak",
880
"*.dpkg-divert", NULL };
881
#ifdef __GNUC__
882
#pragma GCC diagnostic push
883
#pragma GCC diagnostic ignored "-Wcast-qual"
884
#endif
885
for(const char **pat = (const char **)patterns;
886
*pat != NULL; pat++){
887
#ifdef __GNUC__
888
#pragma GCC diagnostic pop
889
#endif
890
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
891
!= FNM_NOMATCH){
892
if(debug){
893
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
894
" matching pattern %s\n", dirent->d_name, *pat);
895
}
896
return 0;
588
897
}
589
898
}
899
return 1;
900
}
901
902
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
903
alphasort);
904
if(numplugins == -1){
905
error(0, errno, "Could not scan plugin dir");
906
direntries = NULL;
907
exitstatus = EX_OSERR;
908
goto fallback;
590
909
}
591
910
592
911
FD_ZERO(&rfds_all);
593
912
594
while(true){
595
dirst = readdir(dir);
596
597
// All directory entries have been processed
598
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
break;
605
}
606
607
d_name_len = strlen(dirst->d_name);
608
609
// Ignore dotfiles, backup files and other junk
610
{
611
bool bad_name = false;
612
613
const char const *bad_prefixes[] = { ".", "#", NULL };
614
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
".dpkg-old",
617
".dpkg-divert", NULL };
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
size_t pre_len = strlen(*pre);
620
if((d_name_len >= pre_len)
621
and strncmp((dirst->d_name), *pre, pre_len) == 0){
622
if(debug){
623
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
624
" with bad prefix %s\n", dirst->d_name, *pre);
625
}
626
bad_name = true;
627
break;
628
}
629
}
630
631
if(bad_name){
632
continue;
633
}
634
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
size_t suf_len = strlen(*suf);
637
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
639
== 0)){
640
if(debug){
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
642
" with bad suffix %s\n", dirst->d_name, *suf);
643
}
644
bad_name = true;
645
break;
646
}
647
}
648
649
if(bad_name){
650
continue;
651
}
652
}
653
654
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
656
if(ret < 0){
657
perror("asprintf");
658
continue;
659
}
660
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
664
free(filename);
665
continue;
666
}
667
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
913
/* Read and execute any executable in the plugin directory*/
914
for(int i = 0; i < numplugins; i++){
915
916
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
917
if(plugin_fd == -1){
918
error(0, errno, "Could not open plugin");
919
free(direntries[i]);
920
continue;
921
}
922
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
923
if(ret == -1){
924
error(0, errno, "stat");
925
close(plugin_fd);
926
free(direntries[i]);
927
continue;
928
}
929
930
/* Ignore non-executable files */
931
if(not S_ISREG(st.st_mode)
932
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
933
X_OK, 0)) != 0)){
669
934
if(debug){
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
" with bad type or mode\n", filename);
935
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
936
" with bad type or mode\n",
937
plugindir != NULL ? plugindir : PDIR,
938
direntries[i]->d_name);
672
939
}
673
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
674
942
continue;
675
943
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
944
945
plugin *p = getplugin(direntries[i]->d_name);
677
946
if(p == NULL){
678
perror("getplugin");
679
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
680
950
continue;
681
951
}
682
952
if(p->disabled){
683
953
if(debug){
684
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
685
dirst->d_name);
955
direntries[i]->d_name);
686
956
}
687
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
688
959
continue;
689
960
}
690
961
{
691
962
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
963
plugin *g = getplugin(NULL);
693
964
if(g != NULL){
694
965
for(char **a = g->argv + 1; *a != NULL; a++){
695
966
if(not add_argument(p, *a)){
696
perror("add_argument");
967
error(0, errno, "add_argument");
697
968
}
698
969
}
699
970
/* Add global environment variables */
700
971
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
703
974
}
704
975
}
705
976
}
706
977
}
707
/* If this plugin has any environment variables, we will call
708
using execve and need to duplicate the environment from this
709
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
710
980
if(p->environ[0] != NULL){
711
981
for(char **e = environ; *e != NULL; e++){
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
719
984
}
720
985
}
721
986
}
722
987
723
988
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
728
goto fallback;
729
}
989
#ifndef O_CLOEXEC
990
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
991
#else /* O_CLOEXEC */
992
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
993
#endif /* O_CLOEXEC */
994
if(ret == -1){
995
error(0, errno, "pipe");
996
exitstatus = EX_OSERR;
997
free(direntries[i]);
998
goto fallback;
999
}
1000
if(pipefd[0] >= FD_SETSIZE){
1001
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
1002
FD_SETSIZE);
1003
close(pipefd[0]);
1004
close(pipefd[1]);
1005
exitstatus = EX_OSERR;
1006
free(direntries[i]);
1007
goto fallback;
1008
}
1009
#ifndef O_CLOEXEC
1010
/* Ask OS to automatic close the pipe on exec */
730
1011
ret = set_cloexec_flag(pipefd[0]);
731
1012
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
734
1018
goto fallback;
735
1019
}
736
1020
ret = set_cloexec_flag(pipefd[1]);
737
1021
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
740
1027
goto fallback;
741
1028
}
1029
#endif /* not O_CLOEXEC */
742
1030
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1031
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1032
&sigchld_action.sa_mask,
1033
NULL));
744
1034
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
747
1038
goto fallback;
748
1039
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
1040
/* Starting a new process to be watched */
1041
pid_t pid;
1042
do {
1043
pid = fork();
1044
} while(pid == -1 and errno == EINTR);
751
1045
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1046
error(0, errno, "fork");
1047
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1048
&sigchld_action.sa_mask, NULL));
1049
close(pipefd[0]);
1050
close(pipefd[1]);
1051
exitstatus = EX_OSERR;
1052
free(direntries[i]);
754
1053
goto fallback;
755
1054
}
756
1055
if(pid == 0){
757
1056
/* this is the child process */
758
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
1058
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
762
1061
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
1063
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
767
1066
}
768
1067
769
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
1069
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
773
1072
}
774
1073
775
if(dirfd(dir) < 0){
776
/* If dir has no file descriptor, we could not set FD_CLOEXEC
777
above and must now close it manually here. */
778
closedir(dir);
779
}
780
if(p->environ[0] == NULL){
781
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
784
}
785
} else {
786
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
789
}
1074
if(fexecve(plugin_fd, p->argv,
1075
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1076
error(0, errno, "fexecve for %s/%s",
1077
plugindir != NULL ? plugindir : PDIR,
1078
direntries[i]->d_name);
1079
_exit(EX_OSERR);
790
1080
}
791
1081
/* no return */
792
1082
}
793
/* parent process */
794
free(filename);
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1083
/* Parent process */
1084
close(pipefd[1]); /* Close unused write end of pipe */
1085
close(plugin_fd);
1086
plugin *new_plugin = getplugin(direntries[i]->d_name);
1087
if(new_plugin == NULL){
1088
error(0, errno, "getplugin");
1089
ret = (int)(TEMP_FAILURE_RETRY
1090
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1091
NULL)));
800
1092
if(ret < 0){
801
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
802
1094
}
803
exitstatus = EXIT_FAILURE;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
804
1097
goto fallback;
805
1098
}
1099
free(direntries[i]);
806
1100
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1101
new_plugin->pid = pid;
1102
new_plugin->fd = pipefd[0];
1103
1104
if(debug){
1105
fprintf(stderr, "Plugin %s started (PID %" PRIdMAX ")\n",
1106
new_plugin->name, (intmax_t) (new_plugin->pid));
1107
}
1108
812
1109
/* Unblock SIGCHLD so signal handler can be run if this process
813
1110
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1112
&sigchld_action.sa_mask,
1113
NULL));
815
1114
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
818
1117
goto fallback;
819
1118
}
820
1119
821
FD_SET(new_process->fd, &rfds_all);
822
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
825
}
826
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
832
closedir(dir);
833
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
839
}
840
while(process_list){
1120
FD_SET(new_plugin->fd, &rfds_all);
1121
1122
if(maxfd < new_plugin->fd){
1123
maxfd = new_plugin->fd;
1124
}
1125
}
1126
1127
free(direntries);
1128
direntries = NULL;
1129
close(dir_fd);
1130
dir_fd = -1;
1131
free_plugin(getplugin(NULL));
1132
1133
for(plugin *p = plugin_list; p != NULL; p = p->next){
1134
if(p->pid != 0){
1135
break;
1136
}
1137
if(p->next == NULL){
1138
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1139
" directory?\n");
1140
free_plugin_list();
1141
}
1142
}
1143
1144
/* Main loop while running plugins exist */
1145
while(plugin_list){
841
1146
fd_set rfds = rfds_all;
842
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
846
1151
goto fallback;
847
1152
}
848
1153
/* OK, now either a process completed, or something can be read
849
1154
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
851
1156
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
853
1158
/* Only accept the plugin output if it exited cleanly */
854
1159
if(not WIFEXITED(proc->status)
855
1160
or WEXITSTATUS(proc->status) != 0){
856
1161
/* Bad exit by plugin */
1162
857
1163
if(debug){
858
1164
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
861
1168
WEXITSTATUS(proc->status));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
866
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1169
} else if(WIFSIGNALED(proc->status)){
1170
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1171
" signal %d: %s\n", proc->name,
1172
(intmax_t) (proc->pid),
1173
WTERMSIG(proc->status),
1174
strsignal(WTERMSIG(proc->status)));
869
1175
}
870
1176
}
1177
871
1178
/* Remove the plugin */
872
1179
FD_CLR(proc->fd, &rfds_all);
1180
873
1181
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1182
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1183
(SIG_BLOCK,
1184
&sigchld_action.sa_mask,
1185
NULL));
875
1186
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
878
1189
goto fallback;
879
1190
}
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1191
1192
plugin *next_plugin = proc->next;
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
893
1196
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
896
1200
if(ret < 0){
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1201
error(0, errno, "sigprocmask");
1202
exitstatus = EX_OSERR;
1203
goto fallback;
1204
}
1205
1206
if(plugin_list == NULL){
1207
break;
1208
}
1209
1210
continue;
905
1211
}
1212
906
1213
/* This process exited nicely, so print its buffer */
907
1214
908
1215
bool bret = print_out_password(proc->buffer,
909
1216
proc->buffer_length);
910
1217
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
913
1220
}
914
1221
goto fallback;
915
1222
}
1223
916
1224
/* This process has not completed. Does it have any output? */
917
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
918
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
919
1228
continue;
920
1229
}
921
1230
/* Before reading, make the process' data buffer large enough */
922
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1232
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1233
+ (size_t) BUFFER_SIZE);
1234
if(new_buffer == NULL){
1235
error(0, errno, "malloc");
1236
exitstatus = EX_OSERR;
928
1237
goto fallback;
929
1238
}
1239
proc->buffer = new_buffer;
930
1240
proc->buffer_size += BUFFER_SIZE;
931
1241
}
932
1242
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1243
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1244
proc->buffer
1245
+ proc->buffer_length,
1246
BUFFER_SIZE));
1247
if(sret < 0){
936
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
937
1250
continue;
938
1251
}
939
if(ret == 0){
1252
if(sret == 0){
940
1253
/* got EOF */
941
1254
proc->eof = true;
942
1255
} else {
943
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
944
1257
}
945
1258
}
946
1259
}
947
948
1260
1261
949
1262
fallback:
950
1263
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
952
1266
/* Fallback if all plugins failed, none are found or an error
953
1267
occured */
954
1268
bool bret;
955
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1270
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1271
size_t len = strlen(passwordbuffer);
1272
/* Strip trailing newline */
1273
if(len > 0 and passwordbuffer[len-1] == '\n'){
1274
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1275
len--;
1276
}
1277
bret = print_out_password(passwordbuffer, len);
958
1278
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
961
1281
}
962
1282
}
963
1283
964
1284
/* Restore old signal handler */
965
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1286
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
969
1289
}
970
1290
971
1291
if(custom_argv != NULL){
972
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1293
free(*arg);
974
1294
}
975
1295
free(custom_argv);
976
1296
}
977
free_plugin_list(plugin_list);
978
979
if(dir != NULL){
980
closedir(dir);
1297
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
981
1302
}
982
1303
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1304
/* Kill the processes */
1305
for(plugin *p = plugin_list; p != NULL; p = p->next){
1306
if(p->pid != 0){
1307
close(p->fd);
1308
ret = kill(p->pid, SIGTERM);
1309
if(ret == -1 and errno != ESRCH){
1310
/* Set-uid proccesses might not get closed */
1311
error(0, errno, "kill");
1312
}
991
1313
}
992
free(process_list->buffer);
993
free(process_list);
994
1314
}
995
1315
996
1316
/* Wait for any remaining child processes to terminate */
997
do{
1317
do {
998
1318
ret = wait(NULL);
999
1319
} while(ret >= 0);
1000
1320
if(errno != ECHILD){
1001
perror("wait");
1321
error(0, errno, "wait");
1002
1322
}
1003
1323
1324
free_plugin_list();
1325
1004
1326
free(plugindir);
1327
free(pluginhelperdir);
1005
1328
free(argfile);
1006
1329
1007
1330
return exitstatus;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0