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- Committer: Teddy Hogeborn
- Date: 2019-07-29 16:35:53 UTC
- mto: This revision was merged to the branch mainline in revision 384.
- 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:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
13
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
14
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
18
* General Public License for more details.
16
19
*
17
20
* You should have received a copy of the GNU General Public License
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
20
22
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
* Contact the authors at <mandos@recompile.se>.
22
24
*/
23
25
24
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,
58
60
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
60
63
#include <signal.h> /* struct sigaction, sigemptyset(),
61
64
sigaddset(), sigaction(),
62
65
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
SIG_UNBLOCK, kill() */
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
64
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() */
65
75
66
76
#define BUFFER_SIZE 256
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;
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>";
85
84
86
85
typedef struct plugin{
87
86
char *name; /* can be NULL or any plugin name */
90
89
char **environ;
91
90
int envc;
92
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;
93
102
struct plugin *next;
94
103
} plugin;
95
104
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))){
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))){
100
115
return p;
101
116
}
102
117
}
103
118
/* Create a new plugin */
104
plugin *new_plugin = malloc(sizeof(plugin));
105
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){
106
124
return NULL;
107
125
}
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
113
114
new_plugin->argv = malloc(sizeof(char *) * 2);
115
if (new_plugin->argv == NULL){
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);
116
150
free(new_plugin);
151
errno = e;
117
152
return NULL;
118
153
}
119
new_plugin->argv[0] = name;
154
new_plugin->argv[0] = copy_name;
120
155
new_plugin->argv[1] = NULL;
121
122
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);
123
160
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
124
163
free(new_plugin->argv);
125
164
free(new_plugin);
165
errno = e;
126
166
return NULL;
127
167
}
128
168
new_plugin->environ[0] = NULL;
169
129
170
/* Append the new plugin to the list */
130
*plugin_list = new_plugin;
171
plugin_list = new_plugin;
131
172
return new_plugin;
132
173
}
133
174
134
175
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
135
177
static bool add_to_char_array(const char *new, char ***array,
136
178
int *len){
137
179
/* Resize the pointed-to array to hold one more pointer */
138
*array = realloc(*array, sizeof(char *)
139
* (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);
140
185
/* Malloc check */
141
if(*array == NULL){
186
if(new_array == NULL){
142
187
return false;
143
188
}
189
*array = new_array;
144
190
/* Make a copy of the new string */
145
char *copy = strdup(new);
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
146
195
if(copy == NULL){
147
196
return false;
148
197
}
155
204
}
156
205
157
206
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
158
208
static bool add_argument(plugin *p, const char *arg){
159
209
if(p == NULL){
160
210
return false;
163
213
}
164
214
165
215
/* Add to a plugin's environment */
166
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){
167
218
if(p == NULL){
168
219
return false;
169
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
}
170
241
return add_to_char_array(def, &(p->environ), &(p->envc));
171
242
}
172
243
173
244
#ifndef O_CLOEXEC
174
245
/*
175
246
* Based on the example in the GNU LibC manual chapter 13.13 "File
176
247
* Descriptor Flags".
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
178
249
*/
179
static int set_cloexec_flag(int fd)
180
{
181
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));
182
253
/* If reading the flags failed, return error indication now. */
183
254
if(ret < 0){
184
255
return ret;
185
256
}
186
257
/* Store modified flag word in the descriptor. */
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
188
260
}
189
190
process *process_list = NULL;
191
192
/* Mark a process as completed when it exits, and save its exit
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
193
265
status. */
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
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;
211
296
}
212
297
213
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){
214
301
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
218
302
for(size_t written = 0; written < length; written += (size_t)ret){
219
303
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
220
304
length - written));
225
309
return true;
226
310
}
227
311
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
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
}
234
338
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
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);
347
}
247
348
}
248
349
249
350
int main(int argc, char *argv[]){
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
351
char *plugindir = NULL;
352
char *pluginhelperdir = NULL;
353
char *argfile = NULL;
252
354
FILE *conffp;
253
size_t d_name_len;
254
DIR *dir = NULL;
255
struct dirent *dirst;
355
struct dirent **direntries = NULL;
256
356
struct stat st;
257
357
fd_set rfds_all;
258
358
int ret, maxfd = 0;
359
ssize_t sret;
259
360
uid_t uid = 65534;
260
361
gid_t gid = 65534;
261
362
bool debug = false;
265
366
.sa_flags = SA_NOCLDSTOP };
266
367
char **custom_argv = NULL;
267
368
int custom_argc = 0;
369
int dir_fd = -1;
268
370
269
371
/* Establish a signal handler */
270
372
sigemptyset(&sigchld_action.sa_mask);
271
373
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
272
if(ret < 0){
273
perror("sigaddset");
274
exit(EXIT_FAILURE);
374
if(ret == -1){
375
error(0, errno, "sigaddset");
376
exitstatus = EX_OSERR;
377
goto fallback;
275
378
}
276
379
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
277
if(ret < 0){
278
perror("sigaction");
279
exit(EXIT_FAILURE);
380
if(ret == -1){
381
error(0, errno, "sigaction");
382
exitstatus = EX_OSERR;
383
goto fallback;
280
384
}
281
385
282
386
/* The options we understand. */
284
388
{ .name = "global-options", .key = 'g',
285
389
.arg = "OPTION[,OPTION[,...]]",
286
390
.doc = "Options passed to all plugins" },
287
{ .name = "global-envs", .key = 'e',
391
{ .name = "global-env", .key = 'G',
288
392
.arg = "VAR=value",
289
393
.doc = "Environment variable passed to all plugins" },
290
394
{ .name = "options-for", .key = 'o',
291
395
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
292
396
.doc = "Options passed only to specified plugin" },
293
{ .name = "envs-for", .key = 'f',
397
{ .name = "env-for", .key = 'E',
294
398
.arg = "PLUGIN:ENV=value",
295
399
.doc = "Environment variable passed to specified plugin" },
296
400
{ .name = "disable", .key = 'd',
297
401
.arg = "PLUGIN",
298
402
.doc = "Disable a specific plugin", .group = 1 },
403
{ .name = "enable", .key = 'e',
404
.arg = "PLUGIN",
405
.doc = "Enable a specific plugin", .group = 1 },
299
406
{ .name = "plugin-dir", .key = 128,
300
407
.arg = "DIRECTORY",
301
408
.doc = "Specify a different plugin directory", .group = 2 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
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 },
310
433
{ .name = NULL }
311
434
};
312
435
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
323
continue;
324
}
325
if(not add_argument(getplugin(NULL, plugins), p)){
326
perror("add_argument");
327
return ARGP_ERR_UNKNOWN;
328
}
329
}
330
}
331
break;
332
case 'e':
333
if(arg == NULL){
334
break;
335
}
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
344
}
345
break;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
366
}
367
}
368
}
369
break;
370
case 'f':
371
if(arg == NULL){
372
break;
373
}
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 */
374
483
{
375
484
char *envdef = strchr(arg, ':');
376
485
if(envdef == NULL){
377
break;
378
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
486
argp_error(state, "No colon in \"%s\"", arg);
487
errno = EINVAL;
488
break;
489
}
490
*envdef = '\0';
383
491
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
385
perror("add_environment");
386
}
387
}
388
break;
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
392
if(p == NULL){
393
return ARGP_ERR_UNKNOWN;
394
}
395
p->disabled = true;
396
}
397
break;
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
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 */
408
553
debug = true;
409
554
break;
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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);
617
argfile = strdup(arg);
618
if(argfile != NULL){
619
errno = 0;
620
}
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 */
629
case ARGP_KEY_ARG:
630
break;
631
default:
632
return ARGP_ERR_UNKNOWN;
633
}
634
return errno;
635
}
636
637
struct argp argp = { .options = options,
638
.parser = parse_opt_config_file,
639
.args_doc = "",
425
640
.doc = "Mandos plugin runner -- Run plugins" };
426
641
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
429
fprintf(stderr, "Unknown error while parsing arguments\n");
430
exitstatus = EXIT_FAILURE;
431
goto end;
432
}
433
434
conffp = fopen(argfile, "r");
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;
658
goto fallback;
659
}
660
661
/* Reset to the normal argument parser */
662
argp.parser = parse_opt;
663
664
/* Open the configfile if available */
665
if(argfile == NULL){
666
conffp = fopen(AFILE, "r");
667
} else {
668
conffp = fopen(argfile, "r");
669
}
435
670
if(conffp != NULL){
436
671
char *org_line = NULL;
672
char *p, *arg, *new_arg, *line;
437
673
size_t size = 0;
438
ssize_t sret;
439
char *p, *arg, *new_arg, *line;
440
674
const char whitespace_delims[] = " \r\t\f\v\n";
441
675
const char comment_delim[] = "#";
442
676
677
custom_argc = 1;
678
custom_argv = malloc(sizeof(char*) * 2);
679
if(custom_argv == NULL){
680
error(0, errno, "malloc");
681
exitstatus = EX_OSERR;
682
goto fallback;
683
}
684
custom_argv[0] = argv[0];
685
custom_argv[1] = NULL;
686
687
/* for each line in the config file, strip whitespace and ignore
688
commented text */
443
689
while(true){
444
690
sret = getline(&org_line, &size, conffp);
445
691
if(sret == -1){
446
692
break;
447
693
}
448
694
449
695
line = org_line;
450
696
arg = strsep(&line, comment_delim);
451
697
while((p = strsep(&arg, whitespace_delims)) != NULL){
453
699
continue;
454
700
}
455
701
new_arg = strdup(p);
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
702
if(new_arg == NULL){
703
error(0, errno, "strdup");
704
exitstatus = EX_OSERR;
705
free(org_line);
706
goto fallback;
707
}
708
709
custom_argc += 1;
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
}
722
}
723
custom_argv[custom_argc-1] = new_arg;
724
custom_argv[custom_argc] = NULL;
462
725
}
463
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
}
464
735
free(org_line);
465
} else{
736
} else {
466
737
/* Check for harmful errors and go to fallback. Other errors might
467
738
not affect opening plugins */
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
perror("fopen");
470
exitstatus = EXIT_FAILURE;
471
goto end;
739
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
740
error(0, errno, "fopen");
741
exitstatus = EX_OSERR;
742
goto fallback;
472
743
}
473
744
}
474
745
/* If there were any arguments from the configuration file, pass
746
them to parser as command line arguments */
475
747
if(custom_argv != NULL){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
479
fprintf(stderr, "Unknown error while parsing arguments\n");
480
exitstatus = EXIT_FAILURE;
481
goto end;
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);
482
800
}
483
801
}
484
802
485
803
if(debug){
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
804
for(plugin *p = plugin_list; p != NULL; p = p->next){
487
805
fprintf(stderr, "Plugin: %s has %d arguments\n",
488
806
p->name ? p->name : "Global", p->argc - 1);
489
807
for(char **a = p->argv; *a != NULL; a++){
490
808
fprintf(stderr, "\tArg: %s\n", *a);
491
809
}
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
810
fprintf(stderr, "...and %d environment variables\n", p->envc);
493
811
for(char **a = p->environ; *a != NULL; a++){
494
812
fprintf(stderr, "\t%s\n", *a);
495
813
}
496
814
}
497
815
}
498
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
}
499
846
ret = setuid(uid);
500
if (ret == -1){
501
perror("setuid");
502
}
503
504
setgid(gid);
505
if (ret == -1){
506
perror("setgid");
507
}
508
509
dir = opendir(plugindir);
510
if(dir == NULL){
511
perror("Could not open plugin dir");
512
exitstatus = EXIT_FAILURE;
513
goto end;
514
}
515
516
/* 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 */
517
852
{
518
int dir_fd = dirfd(dir);
519
if(dir_fd >= 0){
520
ret = set_cloexec_flag(dir_fd);
521
if(ret < 0){
522
perror("set_cloexec_flag");
523
exitstatus = EXIT_FAILURE;
524
goto end;
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;
525
897
}
526
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;
527
909
}
528
910
529
911
FD_ZERO(&rfds_all);
530
912
531
while(true){
532
dirst = readdir(dir);
533
534
// All directory entries have been processed
535
if(dirst == NULL){
536
if (errno == EBADF){
537
perror("readdir");
538
exitstatus = EXIT_FAILURE;
539
goto end;
540
}
541
break;
542
}
543
544
d_name_len = strlen(dirst->d_name);
545
546
// Ignore dotfiles, backup files and other junk
547
{
548
bool bad_name = false;
549
550
const char const *bad_prefixes[] = { ".", "#", NULL };
551
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
553
".dpkg-old",
554
".dpkg-divert", NULL };
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
556
size_t pre_len = strlen(*pre);
557
if((d_name_len >= pre_len)
558
and strncmp((dirst->d_name), *pre, pre_len) == 0){
559
if(debug){
560
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
561
" with bad prefix %s\n", dirst->d_name, *pre);
562
}
563
bad_name = true;
564
break;
565
}
566
}
567
568
if(bad_name){
569
continue;
570
}
571
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
573
size_t suf_len = strlen(*suf);
574
if((d_name_len >= suf_len)
575
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
576
== 0)){
577
if(debug){
578
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
579
" with bad suffix %s\n", dirst->d_name, *suf);
580
}
581
bad_name = true;
582
break;
583
}
584
}
585
586
if(bad_name){
587
continue;
588
}
589
}
590
591
char *filename;
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
593
if(ret < 0){
594
perror("asprintf");
595
continue;
596
}
597
598
ret = stat(filename, &st);
599
if (ret == -1){
600
perror("stat");
601
free(filename);
602
continue;
603
}
604
605
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)){
606
934
if(debug){
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
" 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);
609
939
}
610
free(filename);
940
close(plugin_fd);
941
free(direntries[i]);
611
942
continue;
612
943
}
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
944
945
plugin *p = getplugin(direntries[i]->d_name);
614
946
if(p == NULL){
615
perror("getplugin");
616
free(filename);
947
error(0, errno, "getplugin");
948
close(plugin_fd);
949
free(direntries[i]);
617
950
continue;
618
951
}
619
952
if(p->disabled){
620
953
if(debug){
621
954
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
622
dirst->d_name);
955
direntries[i]->d_name);
623
956
}
624
free(filename);
957
close(plugin_fd);
958
free(direntries[i]);
625
959
continue;
626
960
}
627
961
{
628
962
/* Add global arguments to argument list for this plugin */
629
plugin *g = getplugin(NULL, &plugin_list);
963
plugin *g = getplugin(NULL);
630
964
if(g != NULL){
631
965
for(char **a = g->argv + 1; *a != NULL; a++){
632
966
if(not add_argument(p, *a)){
633
perror("add_argument");
967
error(0, errno, "add_argument");
634
968
}
635
969
}
636
970
/* Add global environment variables */
637
971
for(char **e = g->environ; *e != NULL; e++){
638
if(not add_environment(p, *e)){
639
perror("add_environment");
972
if(not add_environment(p, *e, false)){
973
error(0, errno, "add_environment");
640
974
}
641
975
}
642
976
}
643
977
}
644
/* If this plugin has any environment variables, we will call
645
using execve and need to duplicate the environment from this
646
process, too. */
978
/* If this plugin has any environment variables, we need to
979
duplicate the environment from this process, too. */
647
980
if(p->environ[0] != NULL){
648
981
for(char **e = environ; *e != NULL; e++){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
655
perror("add_environment");
982
if(not add_environment(p, *e, false)){
983
error(0, errno, "add_environment");
656
984
}
657
985
}
658
986
}
659
987
660
int pipefd[2];
661
ret = pipe(pipefd);
662
if (ret == -1){
663
perror("pipe");
664
exitstatus = EXIT_FAILURE;
665
goto end;
666
}
988
int pipefd[2];
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 */
667
1011
ret = set_cloexec_flag(pipefd[0]);
668
1012
if(ret < 0){
669
perror("set_cloexec_flag");
670
exitstatus = EXIT_FAILURE;
671
goto end;
1013
error(0, errno, "set_cloexec_flag");
1014
close(pipefd[0]);
1015
close(pipefd[1]);
1016
exitstatus = EX_OSERR;
1017
free(direntries[i]);
1018
goto fallback;
672
1019
}
673
1020
ret = set_cloexec_flag(pipefd[1]);
674
1021
if(ret < 0){
675
perror("set_cloexec_flag");
676
exitstatus = EXIT_FAILURE;
677
goto end;
1022
error(0, errno, "set_cloexec_flag");
1023
close(pipefd[0]);
1024
close(pipefd[1]);
1025
exitstatus = EX_OSERR;
1026
free(direntries[i]);
1027
goto fallback;
678
1028
}
1029
#endif /* not O_CLOEXEC */
679
1030
/* Block SIGCHLD until process is safely in process list */
680
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));
681
1034
if(ret < 0){
682
perror("sigprocmask");
683
exitstatus = EXIT_FAILURE;
684
goto end;
1035
error(0, errno, "sigprocmask");
1036
exitstatus = EX_OSERR;
1037
free(direntries[i]);
1038
goto fallback;
685
1039
}
686
// Starting a new process to be watched
687
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);
688
1045
if(pid == -1){
689
perror("fork");
690
exitstatus = EXIT_FAILURE;
691
goto end;
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]);
1053
goto fallback;
692
1054
}
693
1055
if(pid == 0){
694
1056
/* this is the child process */
695
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
696
1058
if(ret < 0){
697
perror("sigaction");
698
_exit(EXIT_FAILURE);
1059
error(0, errno, "sigaction");
1060
_exit(EX_OSERR);
699
1061
}
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1062
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
701
1063
if(ret < 0){
702
perror("sigprocmask");
703
_exit(EXIT_FAILURE);
1064
error(0, errno, "sigprocmask");
1065
_exit(EX_OSERR);
704
1066
}
705
1067
706
1068
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
707
1069
if(ret == -1){
708
perror("dup2");
709
_exit(EXIT_FAILURE);
1070
error(0, errno, "dup2");
1071
_exit(EX_OSERR);
710
1072
}
711
1073
712
if(dirfd(dir) < 0){
713
/* If dir has no file descriptor, we could not set FD_CLOEXEC
714
above and must now close it manually here. */
715
closedir(dir);
716
}
717
if(p->environ[0] == NULL){
718
if(execv(filename, p->argv) < 0){
719
perror("execv");
720
_exit(EXIT_FAILURE);
721
}
722
} else {
723
if(execve(filename, p->argv, p->environ) < 0){
724
perror("execve");
725
_exit(EXIT_FAILURE);
726
}
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);
727
1080
}
728
1081
/* no return */
729
1082
}
730
/* parent process */
731
free(filename);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
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)));
737
1092
if(ret < 0){
738
perror("sigprocmask");
1093
error(0, errno, "sigprocmask");
739
1094
}
740
exitstatus = EXIT_FAILURE;
741
goto end;
1095
exitstatus = EX_OSERR;
1096
free(direntries[i]);
1097
goto fallback;
742
1098
}
1099
free(direntries[i]);
743
1100
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
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
749
1109
/* Unblock SIGCHLD so signal handler can be run if this process
750
1110
has already completed */
751
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));
752
1114
if(ret < 0){
753
perror("sigprocmask");
754
exitstatus = EXIT_FAILURE;
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
776
}
777
778
closedir(dir);
779
dir = NULL;
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
785
}
786
while(process_list){
1115
error(0, errno, "sigprocmask");
1116
exitstatus = EX_OSERR;
1117
goto fallback;
1118
}
1119
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){
787
1146
fd_set rfds = rfds_all;
788
1147
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
789
if (select_ret == -1){
790
perror("select");
791
exitstatus = EXIT_FAILURE;
792
goto end;
1148
if(select_ret == -1 and errno != EINTR){
1149
error(0, errno, "select");
1150
exitstatus = EX_OSERR;
1151
goto fallback;
793
1152
}
794
1153
/* OK, now either a process completed, or something can be read
795
1154
from one of them */
796
for(process *proc = process_list; proc ; proc = proc->next){
1155
for(plugin *proc = plugin_list; proc != NULL;){
797
1156
/* Is this process completely done? */
798
if(proc->eof and proc->completed){
1157
if(proc->completed and proc->eof){
799
1158
/* Only accept the plugin output if it exited cleanly */
800
1159
if(not WIFEXITED(proc->status)
801
1160
or WEXITSTATUS(proc->status) != 0){
802
1161
/* Bad exit by plugin */
1162
803
1163
if(debug){
804
1164
if(WIFEXITED(proc->status)){
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
1165
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1166
" status %d\n", proc->name,
1167
(intmax_t) (proc->pid),
807
1168
WEXITSTATUS(proc->status));
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
811
WTERMSIG(proc->status));
812
} else if(WCOREDUMP(proc->status)){
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(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)));
815
1175
}
816
1176
}
1177
817
1178
/* Remove the plugin */
818
1179
FD_CLR(proc->fd, &rfds_all);
1180
819
1181
/* Block signal while modifying process_list */
820
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));
821
1186
if(ret < 0){
822
perror("sigprocmask");
823
exitstatus = EXIT_FAILURE;
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
1187
error(0, errno, "sigprocmask");
1188
exitstatus = EX_OSERR;
1189
goto fallback;
1190
}
1191
1192
plugin *next_plugin = proc->next;
1193
free_plugin(proc);
1194
proc = next_plugin;
1195
839
1196
/* We are done modifying process list, so unblock signal */
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1197
ret = (int)(TEMP_FAILURE_RETRY
1198
(sigprocmask(SIG_UNBLOCK,
1199
&sigchld_action.sa_mask, NULL)));
842
1200
if(ret < 0){
843
perror("sigprocmask");
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
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;
851
1211
}
1212
852
1213
/* This process exited nicely, so print its buffer */
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1214
1215
bool bret = print_out_password(proc->buffer,
1216
proc->buffer_length);
855
1217
if(not bret){
856
perror("print_out_password");
857
exitstatus = EXIT_FAILURE;
1218
error(0, errno, "print_out_password");
1219
exitstatus = EX_IOERR;
858
1220
}
859
goto end;
1221
goto fallback;
860
1222
}
1223
861
1224
/* This process has not completed. Does it have any output? */
862
1225
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
863
1226
/* This process had nothing to say at this time */
1227
proc = proc->next;
864
1228
continue;
865
1229
}
866
1230
/* Before reading, make the process' data buffer large enough */
867
1231
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
869
+ (size_t) BUFFER_SIZE);
870
if (proc->buffer == NULL){
871
perror("malloc");
872
exitstatus = EXIT_FAILURE;
873
goto end;
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;
1237
goto fallback;
874
1238
}
1239
proc->buffer = new_buffer;
875
1240
proc->buffer_size += BUFFER_SIZE;
876
1241
}
877
1242
/* Read from the process */
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
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){
881
1248
/* Read error from this process; ignore the error */
1249
proc = proc->next;
882
1250
continue;
883
1251
}
884
if(ret == 0){
1252
if(sret == 0){
885
1253
/* got EOF */
886
1254
proc->eof = true;
887
1255
} else {
888
proc->buffer_length += (size_t) ret;
1256
proc->buffer_length += (size_t) sret;
889
1257
}
890
1258
}
891
1259
}
892
893
894
end:
895
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1260
1261
1262
fallback:
1263
1264
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1265
and exitstatus != EX_OK)){
1266
/* Fallback if all plugins failed, none are found or an error
1267
occured */
898
1268
bool bret;
899
1269
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
900
1270
char *passwordbuffer = getpass("Password: ");
901
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);
902
1278
if(not bret){
903
perror("print_out_password");
904
exitstatus = EXIT_FAILURE;
905
goto end;
1279
error(0, errno, "print_out_password");
1280
exitstatus = EX_IOERR;
906
1281
}
907
1282
}
908
1283
909
1284
/* Restore old signal handler */
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
1285
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1286
if(ret == -1){
1287
error(0, errno, "sigaction");
1288
exitstatus = EX_OSERR;
1289
}
1290
1291
if(custom_argv != NULL){
1292
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1293
free(*arg);
1294
}
1295
free(custom_argv);
1296
}
1297
1298
free(direntries);
1299
1300
if(dir_fd != -1){
1301
close(dir_fd);
1302
}
1303
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");
921
1312
}
922
1313
}
923
free(plugin_list->environ);
924
free(plugin_list);
925
}
926
927
if(dir != NULL){
928
closedir(dir);
929
}
930
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
939
}
940
free(process_list->buffer);
941
free(process_list);
942
1314
}
943
1315
944
1316
/* Wait for any remaining child processes to terminate */
945
do{
1317
do {
946
1318
ret = wait(NULL);
947
1319
} while(ret >= 0);
948
1320
if(errno != ECHILD){
949
perror("wait");
1321
error(0, errno, "wait");
950
1322
}
951
1323
1324
free_plugin_list();
1325
1326
free(plugindir);
1327
free(pluginhelperdir);
1328
free(argfile);
1329
952
1330
return exitstatus;
953
1331
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0