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- Committer: Teddy Hogeborn
- Date: 2008-08-16 03:29:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816032908-ihw7c05r2mnyk389
Add feature to specify custom environment variables for plugins.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008-2016 Teddy Hogeborn
6
* Copyright © 2008-2016 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <mandos@fukt.bsnet.se>.
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
O_CLOEXEC, pipe2() */
25
asprintf() */
27
26
#include <stddef.h> /* size_t, NULL */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* fstat(), struct stat, waitpid(),
34
WIFEXITED(), WEXITSTATUS(), wait(),
35
pid_t, uid_t, gid_t, getuid(),
36
getgid() */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
38
FD_SET(), FD_ISSET(), FD_CLR */
39
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS(), WTERMSIG(),
41
WCOREDUMP() */
42
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
43
42
#include <iso646.h> /* and, or, not */
44
#include <dirent.h> /* struct dirent, scandirat() */
45
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
46
FD_CLOEXEC, write(), STDOUT_FILENO,
47
struct stat, fstat(), close(),
48
setgid(), setuid(), S_ISREG(),
49
faccessat() pipe2(), fork(),
50
_exit(), dup2(), fexecve(), read()
51
*/
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
44
readdir(), closedir(), dirfd() */
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC, openat(), scandirat(),
54
pipe2() */
55
#include <string.h> /* strsep, strlen(), strsignal(),
56
strcmp(), strncmp() */
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
57
55
#include <errno.h> /* errno */
58
56
#include <argp.h> /* struct argp_option, struct
59
57
argp_state, struct argp,
60
58
argp_parse(), ARGP_ERR_UNKNOWN,
61
ARGP_KEY_END, ARGP_KEY_ARG,
62
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
63
60
#include <signal.h> /* struct sigaction, sigemptyset(),
64
61
sigaddset(), sigaction(),
65
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
SIG_UNBLOCK, kill(), sig_atomic_t
67
*/
63
SIG_UNBLOCK, kill() */
68
64
#include <errno.h> /* errno, EBADF */
69
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
71
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
72
#include <errno.h> /* errno */
73
#include <error.h> /* error() */
74
#include <fnmatch.h> /* fnmatch() */
75
65
76
66
#define BUFFER_SIZE 256
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define PHDIR "/lib/mandos/plugin-helpers"
80
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
81
82
const char *argp_program_version = "plugin-runner " VERSION;
83
const char *argp_program_bug_address = "<mandos@recompile.se>";
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
84
85
85
86
typedef struct plugin{
86
87
char *name; /* can be NULL or any plugin name */
89
90
char **environ;
90
91
int envc;
91
92
bool disabled;
92
93
/* Variables used for running processes*/
94
pid_t pid;
95
int fd;
96
char *buffer;
97
size_t buffer_size;
98
size_t buffer_length;
99
bool eof;
100
volatile sig_atomic_t completed;
101
int status;
102
93
struct plugin *next;
103
94
} plugin;
104
95
105
static plugin *plugin_list = NULL;
106
107
/* Gets an existing plugin based on name,
108
or if none is found, creates a new one */
109
__attribute__((warn_unused_result))
110
static plugin *getplugin(char *name){
111
/* Check for existing plugin with that name */
112
for(plugin *p = plugin_list; p != NULL; p = p->next){
113
if((p->name == name)
114
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
115
100
return p;
116
101
}
117
102
}
118
103
/* Create a new plugin */
119
plugin *new_plugin = NULL;
120
do {
121
new_plugin = malloc(sizeof(plugin));
122
} while(new_plugin == NULL and errno == EINTR);
123
if(new_plugin == NULL){
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
124
106
return NULL;
125
107
}
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);
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){
150
116
free(new_plugin);
151
errno = e;
152
117
return NULL;
153
118
}
154
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
155
120
new_plugin->argv[1] = NULL;
156
157
do {
158
new_plugin->environ = malloc(sizeof(char *));
159
} while(new_plugin->environ == NULL and errno == EINTR);
121
122
new_plugin->environ = malloc(sizeof(char *));
160
123
if(new_plugin->environ == NULL){
161
int e = errno;
162
free(copy_name);
163
124
free(new_plugin->argv);
164
125
free(new_plugin);
165
errno = e;
166
126
return NULL;
167
127
}
168
128
new_plugin->environ[0] = NULL;
169
170
129
/* Append the new plugin to the list */
171
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
172
131
return new_plugin;
173
132
}
174
133
175
134
/* Helper function for add_argument and add_environment */
176
__attribute__((nonnull, warn_unused_result))
177
135
static bool add_to_char_array(const char *new, char ***array,
178
136
int *len){
179
137
/* Resize the pointed-to array to hold one more pointer */
180
char **new_array = NULL;
181
do {
182
new_array = realloc(*array, sizeof(char *)
183
* (size_t) ((*len) + 2));
184
} while(new_array == NULL and errno == EINTR);
138
*array = realloc(*array, sizeof(char *)
139
* (size_t) ((*len) + 2));
185
140
/* Malloc check */
186
if(new_array == NULL){
141
if(*array == NULL){
187
142
return false;
188
143
}
189
*array = new_array;
190
144
/* Make a copy of the new string */
191
char *copy;
192
do {
193
copy = strdup(new);
194
} while(copy == NULL and errno == EINTR);
145
char *copy = strdup(new);
195
146
if(copy == NULL){
196
147
return false;
197
148
}
204
155
}
205
156
206
157
/* Add to a plugin's argument vector */
207
__attribute__((nonnull(2), warn_unused_result))
208
158
static bool add_argument(plugin *p, const char *arg){
209
159
if(p == NULL){
210
160
return false;
213
163
}
214
164
215
165
/* Add to a plugin's environment */
216
__attribute__((nonnull(2), warn_unused_result))
217
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
218
167
if(p == NULL){
219
168
return false;
220
169
}
221
/* namelen = length of name of environment variable */
222
size_t namelen = (size_t)(strchrnul(def, '=') - def);
223
/* Search for this environment variable */
224
for(char **envdef = p->environ; *envdef != NULL; envdef++){
225
if(strncmp(*envdef, def, namelen + 1) == 0){
226
/* It already exists */
227
if(replace){
228
char *new_envdef;
229
do {
230
new_envdef = realloc(*envdef, strlen(def) + 1);
231
} while(new_envdef == NULL and errno == EINTR);
232
if(new_envdef == NULL){
233
return false;
234
}
235
*envdef = new_envdef;
236
strcpy(*envdef, def);
237
}
238
return true;
239
}
240
}
241
170
return add_to_char_array(def, &(p->environ), &(p->envc));
242
171
}
243
172
244
#ifndef O_CLOEXEC
173
245
174
/*
246
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
247
176
* Descriptor Flags".
248
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
249
178
*/
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));
179
static int set_cloexec_flag(int fd)
180
{
181
int ret = fcntl(fd, F_GETFD, 0);
253
182
/* If reading the flags failed, return error indication now. */
254
183
if(ret < 0){
255
184
return ret;
256
185
}
257
186
/* Store modified flag word in the descriptor. */
258
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
259
ret | FD_CLOEXEC));
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
260
188
}
261
#endif /* not O_CLOEXEC */
262
263
264
/* Mark processes as completed when they exit, and save their exit
189
190
process *process_list = NULL;
191
192
/* Mark a process as completed when it exits, and save its exit
265
193
status. */
266
static void handle_sigchld(__attribute__((unused)) int sig){
267
int old_errno = errno;
268
while(true){
269
plugin *proc = plugin_list;
270
int status;
271
pid_t pid = waitpid(-1, &status, WNOHANG);
272
if(pid == 0){
273
/* Only still running child processes */
274
break;
275
}
276
if(pid == -1){
277
if(errno == ECHILD){
278
/* No child processes */
279
break;
280
}
281
error(0, errno, "waitpid");
282
}
283
284
/* A child exited, find it in process_list */
285
while(proc != NULL and proc->pid != pid){
286
proc = proc->next;
287
}
288
if(proc == NULL){
289
/* Process not found in process list */
290
continue;
291
}
292
proc->status = status;
293
proc->completed = 1;
294
}
295
errno = old_errno;
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;
296
211
}
297
212
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){
213
bool print_out_password(const char *buffer, size_t length){
301
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
302
218
for(size_t written = 0; written < length; written += (size_t)ret){
303
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
304
220
length - written));
309
225
return true;
310
226
}
311
227
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; *arg != NULL; arg++){
317
free(*arg);
318
}
319
free(plugin_node->argv);
320
for(char **env = plugin_node->environ; *env != NULL; env++){
321
free(*env);
322
}
323
free(plugin_node->environ);
324
free(plugin_node->buffer);
325
326
/* Removes the plugin from the singly-linked list */
327
if(plugin_node == plugin_list){
328
/* First one - simple */
329
plugin_list = plugin_list->next;
330
} else {
331
/* Second one or later */
332
for(plugin *p = plugin_list; p != NULL; p = p->next){
333
if(p->next == plugin_node){
334
p->next = plugin_node->next;
335
break;
336
}
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;
337
234
}
338
}
339
340
free(plugin_node);
341
}
342
343
static void free_plugin_list(void){
344
while(plugin_list != NULL){
345
free_plugin(plugin_list);
346
}
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;
347
247
}
348
248
349
249
int main(int argc, char *argv[]){
350
char *plugindir = NULL;
351
char *pluginhelperdir = NULL;
352
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
353
252
FILE *conffp;
354
struct dirent **direntries = NULL;
253
size_t d_name_len;
254
DIR *dir = NULL;
255
struct dirent *dirst;
355
256
struct stat st;
356
257
fd_set rfds_all;
357
258
int ret, maxfd = 0;
358
ssize_t sret;
359
259
uid_t uid = 65534;
360
260
gid_t gid = 65534;
361
261
bool debug = false;
365
265
.sa_flags = SA_NOCLDSTOP };
366
266
char **custom_argv = NULL;
367
267
int custom_argc = 0;
368
int dir_fd = -1;
369
268
370
269
/* Establish a signal handler */
371
270
sigemptyset(&sigchld_action.sa_mask);
372
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
373
if(ret == -1){
374
error(0, errno, "sigaddset");
375
exitstatus = EX_OSERR;
376
goto fallback;
272
if(ret < 0){
273
perror("sigaddset");
274
exit(EXIT_FAILURE);
377
275
}
378
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
379
if(ret == -1){
380
error(0, errno, "sigaction");
381
exitstatus = EX_OSERR;
382
goto fallback;
277
if(ret < 0){
278
perror("sigaction");
279
exit(EXIT_FAILURE);
383
280
}
384
281
385
282
/* The options we understand. */
387
284
{ .name = "global-options", .key = 'g',
388
285
.arg = "OPTION[,OPTION[,...]]",
389
286
.doc = "Options passed to all plugins" },
390
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
391
288
.arg = "VAR=value",
392
289
.doc = "Environment variable passed to all plugins" },
393
290
{ .name = "options-for", .key = 'o',
394
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
395
292
.doc = "Options passed only to specified plugin" },
396
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
397
294
.arg = "PLUGIN:ENV=value",
398
295
.doc = "Environment variable passed to specified plugin" },
399
296
{ .name = "disable", .key = 'd',
400
297
.arg = "PLUGIN",
401
298
.doc = "Disable a specific plugin", .group = 1 },
402
{ .name = "enable", .key = 'e',
403
.arg = "PLUGIN",
404
.doc = "Enable a specific plugin", .group = 1 },
405
299
{ .name = "plugin-dir", .key = 128,
406
300
.arg = "DIRECTORY",
407
301
.doc = "Specify a different plugin directory", .group = 2 },
408
{ .name = "config-file", .key = 129,
409
.arg = "FILE",
410
.doc = "Specify a different configuration file", .group = 2 },
411
{ .name = "userid", .key = 130,
412
.arg = "ID", .flags = 0,
413
.doc = "User ID the plugins will run as", .group = 3 },
414
{ .name = "groupid", .key = 131,
415
.arg = "ID", .flags = 0,
416
.doc = "Group ID the plugins will run as", .group = 3 },
417
{ .name = "debug", .key = 132,
418
.doc = "Debug mode", .group = 4 },
419
{ .name = "plugin-helper-dir", .key = 133,
420
.arg = "DIRECTORY",
421
.doc = "Specify a different plugin helper directory",
422
.group = 2 },
423
/*
424
* These reproduce what we would get without ARGP_NO_HELP
425
*/
426
{ .name = "help", .key = '?',
427
.doc = "Give this help list", .group = -1 },
428
{ .name = "usage", .key = -3,
429
.doc = "Give a short usage message", .group = -1 },
430
{ .name = "version", .key = 'V',
431
.doc = "Print program version", .group = -1 },
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 },
432
310
{ .name = NULL }
433
311
};
434
312
435
__attribute__((nonnull(3)))
436
error_t parse_opt(int key, char *arg, struct argp_state *state){
437
errno = 0;
438
switch(key){
439
char *tmp;
440
intmax_t tmp_id;
441
case 'g': /* --global-options */
442
{
443
char *plugin_option;
444
while((plugin_option = strsep(&arg, ",")) != NULL){
445
if(not add_argument(getplugin(NULL), plugin_option)){
446
break;
447
}
448
}
449
errno = 0;
450
}
451
break;
452
case 'G': /* --global-env */
453
if(add_environment(getplugin(NULL), arg, true)){
454
errno = 0;
455
}
456
break;
457
case 'o': /* --options-for */
458
{
459
char *option_list = strchr(arg, ':');
460
if(option_list == NULL){
461
argp_error(state, "No colon in \"%s\"", arg);
462
errno = EINVAL;
463
break;
464
}
465
*option_list = '\0';
466
option_list++;
467
if(arg[0] == '\0'){
468
argp_error(state, "Empty plugin name");
469
errno = EINVAL;
470
break;
471
}
472
char *option;
473
while((option = strsep(&option_list, ",")) != NULL){
474
if(not add_argument(getplugin(arg), option)){
475
break;
476
}
477
}
478
errno = 0;
479
}
480
break;
481
case 'E': /* --env-for */
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
}
482
374
{
483
375
char *envdef = strchr(arg, ':');
484
376
if(envdef == NULL){
485
argp_error(state, "No colon in \"%s\"", arg);
486
errno = EINVAL;
487
break;
488
}
489
*envdef = '\0';
377
break;
378
}
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
490
383
envdef++;
491
if(arg[0] == '\0'){
492
argp_error(state, "Empty plugin name");
493
errno = EINVAL;
494
break;
495
}
496
if(add_environment(getplugin(arg), envdef, true)){
497
errno = 0;
498
}
499
}
500
break;
501
case 'd': /* --disable */
502
{
503
plugin *p = getplugin(arg);
504
if(p != NULL){
505
p->disabled = true;
506
errno = 0;
507
}
508
}
509
break;
510
case 'e': /* --enable */
511
{
512
plugin *p = getplugin(arg);
513
if(p != NULL){
514
p->disabled = false;
515
errno = 0;
516
}
517
}
518
break;
519
case 128: /* --plugin-dir */
520
free(plugindir);
521
plugindir = strdup(arg);
522
if(plugindir != NULL){
523
errno = 0;
524
}
525
break;
526
case 129: /* --config-file */
527
/* This is already done by parse_opt_config_file() */
528
break;
529
case 130: /* --userid */
530
tmp_id = strtoimax(arg, &tmp, 10);
531
if(errno != 0 or tmp == arg or *tmp != '\0'
532
or tmp_id != (uid_t)tmp_id){
533
argp_error(state, "Bad user ID number: \"%s\", using %"
534
PRIdMAX, arg, (intmax_t)uid);
535
break;
536
}
537
uid = (uid_t)tmp_id;
538
errno = 0;
539
break;
540
case 131: /* --groupid */
541
tmp_id = strtoimax(arg, &tmp, 10);
542
if(errno != 0 or tmp == arg or *tmp != '\0'
543
or tmp_id != (gid_t)tmp_id){
544
argp_error(state, "Bad group ID number: \"%s\", using %"
545
PRIdMAX, arg, (intmax_t)gid);
546
break;
547
}
548
gid = (gid_t)tmp_id;
549
errno = 0;
550
break;
551
case 132: /* --debug */
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:
552
408
debug = true;
553
409
break;
554
case 133: /* --plugin-helper-dir */
555
free(pluginhelperdir);
556
pluginhelperdir = strdup(arg);
557
if(pluginhelperdir != NULL){
558
errno = 0;
559
}
560
break;
561
/*
562
* These reproduce what we would get without ARGP_NO_HELP
563
*/
564
case '?': /* --help */
565
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
566
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
567
case -3: /* --usage */
568
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
569
argp_state_help(state, state->out_stream,
570
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
571
case 'V': /* --version */
572
fprintf(state->out_stream, "%s\n", argp_program_version);
573
exit(EXIT_SUCCESS);
574
break;
575
/*
576
* When adding more options before this line, remember to also add a
577
* "case" to the "parse_opt_config_file" function below.
578
*/
579
case ARGP_KEY_ARG:
580
/* Cryptsetup always passes an argument, which is an empty
581
string if "none" was specified in /etc/crypttab. So if
582
argument was empty, we ignore it silently. */
583
if(arg[0] == '\0'){
584
break;
585
}
586
default:
587
return ARGP_ERR_UNKNOWN;
588
}
589
return errno; /* Set to 0 at start */
590
}
591
592
/* This option parser is the same as parse_opt() above, except it
593
ignores everything but the --config-file option. */
594
error_t parse_opt_config_file(int key, char *arg,
595
__attribute__((unused))
596
struct argp_state *state){
597
errno = 0;
598
switch(key){
599
case 'g': /* --global-options */
600
case 'G': /* --global-env */
601
case 'o': /* --options-for */
602
case 'E': /* --env-for */
603
case 'd': /* --disable */
604
case 'e': /* --enable */
605
case 128: /* --plugin-dir */
606
break;
607
case 129: /* --config-file */
608
free(argfile);
609
argfile = strdup(arg);
610
if(argfile != NULL){
611
errno = 0;
612
}
613
break;
614
case 130: /* --userid */
615
case 131: /* --groupid */
616
case 132: /* --debug */
617
case 133: /* --plugin-helper-dir */
618
case '?': /* --help */
619
case -3: /* --usage */
620
case 'V': /* --version */
621
case ARGP_KEY_ARG:
622
break;
623
default:
624
return ARGP_ERR_UNKNOWN;
625
}
626
return errno;
627
}
628
629
struct argp argp = { .options = options,
630
.parser = parse_opt_config_file,
631
.args_doc = "",
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]",
632
425
.doc = "Mandos plugin runner -- Run plugins" };
633
426
634
/* Parse using parse_opt_config_file() in order to get the custom
635
config file location, if any. */
636
ret = argp_parse(&argp, argc, argv,
637
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
638
NULL, NULL);
639
switch(ret){
640
case 0:
641
break;
642
case ENOMEM:
643
default:
644
errno = ret;
645
error(0, errno, "argp_parse");
646
exitstatus = EX_OSERR;
647
goto fallback;
648
case EINVAL:
649
exitstatus = EX_USAGE;
650
goto fallback;
651
}
652
653
/* Reset to the normal argument parser */
654
argp.parser = parse_opt;
655
656
/* Open the configfile if available */
657
if(argfile == NULL){
658
conffp = fopen(AFILE, "r");
659
} else {
660
conffp = fopen(argfile, "r");
661
}
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");
662
435
if(conffp != NULL){
663
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
664
439
char *p, *arg, *new_arg, *line;
665
size_t size = 0;
666
440
const char whitespace_delims[] = " \r\t\f\v\n";
667
441
const char comment_delim[] = "#";
668
669
custom_argc = 1;
670
custom_argv = malloc(sizeof(char*) * 2);
671
if(custom_argv == NULL){
672
error(0, errno, "malloc");
673
exitstatus = EX_OSERR;
674
goto fallback;
675
}
676
custom_argv[0] = argv[0];
677
custom_argv[1] = NULL;
678
679
/* for each line in the config file, strip whitespace and ignore
680
commented text */
442
681
443
while(true){
682
444
sret = getline(&org_line, &size, conffp);
683
445
if(sret == -1){
684
446
break;
685
447
}
686
448
687
449
line = org_line;
688
450
arg = strsep(&line, comment_delim);
689
451
while((p = strsep(&arg, whitespace_delims)) != NULL){
691
453
continue;
692
454
}
693
455
new_arg = strdup(p);
694
if(new_arg == NULL){
695
error(0, errno, "strdup");
696
exitstatus = EX_OSERR;
697
free(org_line);
698
goto fallback;
699
}
700
701
custom_argc += 1;
702
{
703
char **new_argv = realloc(custom_argv, sizeof(char *)
704
* ((size_t)custom_argc + 1));
705
if(new_argv == NULL){
706
error(0, errno, "realloc");
707
exitstatus = EX_OSERR;
708
free(new_arg);
709
free(org_line);
710
goto fallback;
711
} else {
712
custom_argv = new_argv;
713
}
714
}
715
custom_argv[custom_argc-1] = new_arg;
716
custom_argv[custom_argc] = NULL;
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
}
717
462
}
718
463
}
719
do {
720
ret = fclose(conffp);
721
} while(ret == EOF and errno == EINTR);
722
if(ret == EOF){
723
error(0, errno, "fclose");
724
exitstatus = EX_IOERR;
725
goto fallback;
726
}
727
464
free(org_line);
728
} else {
465
} else{
729
466
/* Check for harmful errors and go to fallback. Other errors might
730
467
not affect opening plugins */
731
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
732
error(0, errno, "fopen");
733
exitstatus = EX_OSERR;
734
goto fallback;
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
469
perror("fopen");
470
exitstatus = EXIT_FAILURE;
471
goto end;
735
472
}
736
473
}
737
/* If there were any arguments from the configuration file, pass
738
them to parser as command line arguments */
474
739
475
if(custom_argv != NULL){
740
ret = argp_parse(&argp, custom_argc, custom_argv,
741
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
742
NULL, NULL);
743
switch(ret){
744
case 0:
745
break;
746
case ENOMEM:
747
default:
748
errno = ret;
749
error(0, errno, "argp_parse");
750
exitstatus = EX_OSERR;
751
goto fallback;
752
case EINVAL:
753
exitstatus = EX_CONFIG;
754
goto fallback;
755
}
756
}
757
758
/* Parse actual command line arguments, to let them override the
759
config file */
760
ret = argp_parse(&argp, argc, argv,
761
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
762
NULL, NULL);
763
switch(ret){
764
case 0:
765
break;
766
case ENOMEM:
767
default:
768
errno = ret;
769
error(0, errno, "argp_parse");
770
exitstatus = EX_OSERR;
771
goto fallback;
772
case EINVAL:
773
exitstatus = EX_USAGE;
774
goto fallback;
775
}
776
777
{
778
char *pluginhelperenv;
779
bool bret = true;
780
ret = asprintf(&pluginhelperenv, "MANDOSPLUGINHELPERDIR=%s",
781
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
782
if(ret != -1){
783
bret = add_environment(getplugin(NULL), pluginhelperenv, true);
784
}
785
if(ret == -1 or not bret){
786
error(0, errno, "Failed to set MANDOSPLUGINHELPERDIR"
787
" environment variable to \"%s\" for all plugins\n",
788
pluginhelperdir != NULL ? pluginhelperdir : PHDIR);
789
}
790
if(ret != -1){
791
free(pluginhelperenv);
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;
792
482
}
793
483
}
794
484
799
489
for(char **a = p->argv; *a != NULL; a++){
800
490
fprintf(stderr, "\tArg: %s\n", *a);
801
491
}
802
fprintf(stderr, "...and %d environment variables\n", p->envc);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
803
493
for(char **a = p->environ; *a != NULL; a++){
804
494
fprintf(stderr, "\t%s\n", *a);
805
495
}
806
496
}
807
497
}
808
498
809
if(getuid() == 0){
810
/* Work around Debian bug #633582:
811
<http://bugs.debian.org/633582> */
812
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
813
if(plugindir_fd == -1){
814
if(errno != ENOENT){
815
error(0, errno, "open(\"" PDIR "\")");
816
}
817
} else {
818
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
819
if(ret == -1){
820
error(0, errno, "fstat");
821
} else {
822
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
823
ret = fchown(plugindir_fd, uid, gid);
824
if(ret == -1){
825
error(0, errno, "fchown");
826
}
827
}
828
}
829
close(plugindir_fd);
830
}
831
}
832
833
/* Lower permissions */
834
ret = setgid(gid);
835
if(ret == -1){
836
error(0, errno, "setgid");
837
}
838
499
ret = setuid(uid);
839
if(ret == -1){
840
error(0, errno, "setuid");
841
}
842
843
/* Open plugin directory with close_on_exec flag */
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 */
844
517
{
845
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
846
#ifdef O_CLOEXEC
847
O_CLOEXEC
848
#else /* not O_CLOEXEC */
849
0
850
#endif /* not O_CLOEXEC */
851
);
852
if(dir_fd == -1){
853
error(0, errno, "Could not open plugin dir");
854
exitstatus = EX_UNAVAILABLE;
855
goto fallback;
856
}
857
858
#ifndef O_CLOEXEC
859
/* Set the FD_CLOEXEC flag on the directory */
860
ret = set_cloexec_flag(dir_fd);
861
if(ret < 0){
862
error(0, errno, "set_cloexec_flag");
863
exitstatus = EX_OSERR;
864
goto fallback;
865
}
866
#endif /* O_CLOEXEC */
867
}
868
869
int good_name(const struct dirent * const dirent){
870
const char * const patterns[] = { ".*", "#*#", "*~", "*.dpkg-new",
871
"*.dpkg-old", "*.dpkg-bak",
872
"*.dpkg-divert", NULL };
873
#ifdef __GNUC__
874
#pragma GCC diagnostic push
875
#pragma GCC diagnostic ignored "-Wcast-qual"
876
#endif
877
for(const char **pat = (const char **)patterns;
878
*pat != NULL; pat++){
879
#ifdef __GNUC__
880
#pragma GCC diagnostic pop
881
#endif
882
if(fnmatch(*pat, dirent->d_name, FNM_FILE_NAME | FNM_PERIOD)
883
!= FNM_NOMATCH){
884
if(debug){
885
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
886
" matching pattern %s\n", dirent->d_name, *pat);
887
}
888
return 0;
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;
889
525
}
890
526
}
891
return 1;
892
}
893
894
int numplugins = scandirat(dir_fd, ".", &direntries, good_name,
895
alphasort);
896
if(numplugins == -1){
897
error(0, errno, "Could not scan plugin dir");
898
direntries = NULL;
899
exitstatus = EX_OSERR;
900
goto fallback;
901
527
}
902
528
903
529
FD_ZERO(&rfds_all);
904
530
905
/* Read and execute any executable in the plugin directory*/
906
for(int i = 0; i < numplugins; i++){
907
908
int plugin_fd = openat(dir_fd, direntries[i]->d_name, O_RDONLY);
909
if(plugin_fd == -1){
910
error(0, errno, "Could not open plugin");
911
free(direntries[i]);
912
continue;
913
}
914
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
915
if(ret == -1){
916
error(0, errno, "stat");
917
close(plugin_fd);
918
free(direntries[i]);
919
continue;
920
}
921
922
/* Ignore non-executable files */
923
if(not S_ISREG(st.st_mode)
924
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, direntries[i]->d_name,
925
X_OK, 0)) != 0)){
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)){
926
606
if(debug){
927
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
928
" with bad type or mode\n",
929
plugindir != NULL ? plugindir : PDIR,
930
direntries[i]->d_name);
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
608
" with bad type or mode\n", filename);
931
609
}
932
close(plugin_fd);
933
free(direntries[i]);
610
free(filename);
934
611
continue;
935
612
}
936
937
plugin *p = getplugin(direntries[i]->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
938
614
if(p == NULL){
939
error(0, errno, "getplugin");
940
close(plugin_fd);
941
free(direntries[i]);
615
perror("getplugin");
616
free(filename);
942
617
continue;
943
618
}
944
619
if(p->disabled){
945
620
if(debug){
946
621
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
947
direntries[i]->d_name);
622
dirst->d_name);
948
623
}
949
close(plugin_fd);
950
free(direntries[i]);
624
free(filename);
951
625
continue;
952
626
}
953
627
{
954
628
/* Add global arguments to argument list for this plugin */
955
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
956
630
if(g != NULL){
957
631
for(char **a = g->argv + 1; *a != NULL; a++){
958
632
if(not add_argument(p, *a)){
959
error(0, errno, "add_argument");
633
perror("add_argument");
960
634
}
961
635
}
962
636
/* Add global environment variables */
963
637
for(char **e = g->environ; *e != NULL; e++){
964
if(not add_environment(p, *e, false)){
965
error(0, errno, "add_environment");
638
if(not add_environment(p, *e)){
639
perror("add_environment");
966
640
}
967
641
}
968
642
}
969
643
}
970
/* If this plugin has any environment variables, we need to
971
duplicate the environment from this process, too. */
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. */
972
647
if(p->environ[0] != NULL){
973
648
for(char **e = environ; *e != NULL; e++){
974
if(not add_environment(p, *e, false)){
975
error(0, errno, "add_environment");
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");
976
656
}
977
657
}
978
658
}
979
659
980
int pipefd[2];
981
#ifndef O_CLOEXEC
982
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
983
#else /* O_CLOEXEC */
984
ret = (int)TEMP_FAILURE_RETRY(pipe2(pipefd, O_CLOEXEC));
985
#endif /* O_CLOEXEC */
986
if(ret == -1){
987
error(0, errno, "pipe");
988
exitstatus = EX_OSERR;
989
free(direntries[i]);
990
goto fallback;
991
}
992
if(pipefd[0] >= FD_SETSIZE){
993
fprintf(stderr, "pipe()[0] (%d) >= FD_SETSIZE (%d)", pipefd[0],
994
FD_SETSIZE);
995
close(pipefd[0]);
996
close(pipefd[1]);
997
exitstatus = EX_OSERR;
998
free(direntries[i]);
999
goto fallback;
1000
}
1001
#ifndef O_CLOEXEC
1002
/* Ask OS to automatic close the pipe on exec */
660
int pipefd[2];
661
ret = pipe(pipefd);
662
if (ret == -1){
663
perror("pipe");
664
exitstatus = EXIT_FAILURE;
665
goto end;
666
}
1003
667
ret = set_cloexec_flag(pipefd[0]);
1004
668
if(ret < 0){
1005
error(0, errno, "set_cloexec_flag");
1006
close(pipefd[0]);
1007
close(pipefd[1]);
1008
exitstatus = EX_OSERR;
1009
free(direntries[i]);
1010
goto fallback;
669
perror("set_cloexec_flag");
670
exitstatus = EXIT_FAILURE;
671
goto end;
1011
672
}
1012
673
ret = set_cloexec_flag(pipefd[1]);
1013
674
if(ret < 0){
1014
error(0, errno, "set_cloexec_flag");
1015
close(pipefd[0]);
1016
close(pipefd[1]);
1017
exitstatus = EX_OSERR;
1018
free(direntries[i]);
1019
goto fallback;
675
perror("set_cloexec_flag");
676
exitstatus = EXIT_FAILURE;
677
goto end;
1020
678
}
1021
#endif /* not O_CLOEXEC */
1022
679
/* Block SIGCHLD until process is safely in process list */
1023
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1024
&sigchld_action.sa_mask,
1025
NULL));
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1026
681
if(ret < 0){
1027
error(0, errno, "sigprocmask");
1028
exitstatus = EX_OSERR;
1029
free(direntries[i]);
1030
goto fallback;
682
perror("sigprocmask");
683
exitstatus = EXIT_FAILURE;
684
goto end;
1031
685
}
1032
/* Starting a new process to be watched */
1033
pid_t pid;
1034
do {
1035
pid = fork();
1036
} while(pid == -1 and errno == EINTR);
686
// Starting a new process to be watched
687
pid_t pid = fork();
1037
688
if(pid == -1){
1038
error(0, errno, "fork");
1039
TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1040
&sigchld_action.sa_mask, NULL));
1041
close(pipefd[0]);
1042
close(pipefd[1]);
1043
exitstatus = EX_OSERR;
1044
free(direntries[i]);
1045
goto fallback;
689
perror("fork");
690
exitstatus = EXIT_FAILURE;
691
goto end;
1046
692
}
1047
693
if(pid == 0){
1048
694
/* this is the child process */
1049
695
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1050
696
if(ret < 0){
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
697
perror("sigaction");
698
_exit(EXIT_FAILURE);
1053
699
}
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1055
701
if(ret < 0){
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
702
perror("sigprocmask");
703
_exit(EXIT_FAILURE);
1058
704
}
1059
705
1060
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
1061
707
if(ret == -1){
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
708
perror("dup2");
709
_exit(EXIT_FAILURE);
1064
710
}
1065
711
1066
if(fexecve(plugin_fd, p->argv,
1067
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1068
error(0, errno, "fexecve for %s/%s",
1069
plugindir != NULL ? plugindir : PDIR,
1070
direntries[i]->d_name);
1071
_exit(EX_OSERR);
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
}
1072
727
}
1073
728
/* no return */
1074
729
}
1075
/* Parent process */
1076
close(pipefd[1]); /* Close unused write end of pipe */
1077
close(plugin_fd);
1078
plugin *new_plugin = getplugin(direntries[i]->d_name);
1079
if(new_plugin == NULL){
1080
error(0, errno, "getplugin");
1081
ret = (int)(TEMP_FAILURE_RETRY
1082
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1083
NULL)));
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);
1084
737
if(ret < 0){
1085
error(0, errno, "sigprocmask");
738
perror("sigprocmask");
1086
739
}
1087
exitstatus = EX_OSERR;
1088
free(direntries[i]);
1089
goto fallback;
740
exitstatus = EXIT_FAILURE;
741
goto end;
1090
742
}
1091
free(direntries[i]);
1092
1093
new_plugin->pid = pid;
1094
new_plugin->fd = pipefd[0];
1095
743
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
1096
749
/* Unblock SIGCHLD so signal handler can be run if this process
1097
750
has already completed */
1098
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1099
&sigchld_action.sa_mask,
1100
NULL));
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1101
752
if(ret < 0){
1102
error(0, errno, "sigprocmask");
1103
exitstatus = EX_OSERR;
1104
goto fallback;
1105
}
1106
1107
FD_SET(new_plugin->fd, &rfds_all);
1108
1109
if(maxfd < new_plugin->fd){
1110
maxfd = new_plugin->fd;
1111
}
1112
}
1113
1114
free(direntries);
1115
direntries = NULL;
1116
close(dir_fd);
1117
dir_fd = -1;
1118
free_plugin(getplugin(NULL));
1119
1120
for(plugin *p = plugin_list; p != NULL; p = p->next){
1121
if(p->pid != 0){
1122
break;
1123
}
1124
if(p->next == NULL){
1125
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1126
" directory?\n");
1127
free_plugin_list();
1128
}
1129
}
1130
1131
/* Main loop while running plugins exist */
1132
while(plugin_list){
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){
1133
787
fd_set rfds = rfds_all;
1134
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1135
if(select_ret == -1 and errno != EINTR){
1136
error(0, errno, "select");
1137
exitstatus = EX_OSERR;
1138
goto fallback;
789
if (select_ret == -1){
790
perror("select");
791
exitstatus = EXIT_FAILURE;
792
goto end;
1139
793
}
1140
794
/* OK, now either a process completed, or something can be read
1141
795
from one of them */
1142
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
1143
797
/* Is this process completely done? */
1144
if(proc->completed and proc->eof){
798
if(proc->eof and proc->completed){
1145
799
/* Only accept the plugin output if it exited cleanly */
1146
800
if(not WIFEXITED(proc->status)
1147
801
or WEXITSTATUS(proc->status) != 0){
1148
802
/* Bad exit by plugin */
1149
1150
803
if(debug){
1151
804
if(WIFEXITED(proc->status)){
1152
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1153
" status %d\n", proc->name,
1154
(intmax_t) (proc->pid),
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
1155
807
WEXITSTATUS(proc->status));
1156
} else if(WIFSIGNALED(proc->status)){
1157
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1158
" signal %d: %s\n", proc->name,
1159
(intmax_t) (proc->pid),
1160
WTERMSIG(proc->status),
1161
strsignal(WTERMSIG(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));
1162
812
} else if(WCOREDUMP(proc->status)){
1163
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1164
" core\n", proc->name, (intmax_t) (proc->pid));
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
1165
815
}
1166
816
}
1167
1168
817
/* Remove the plugin */
1169
818
FD_CLR(proc->fd, &rfds_all);
1170
1171
819
/* Block signal while modifying process_list */
1172
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1173
(SIG_BLOCK,
1174
&sigchld_action.sa_mask,
1175
NULL));
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1176
821
if(ret < 0){
1177
error(0, errno, "sigprocmask");
1178
exitstatus = EX_OSERR;
1179
goto fallback;
1180
}
1181
1182
plugin *next_plugin = proc->next;
1183
free_plugin(proc);
1184
proc = next_plugin;
1185
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
}
1186
839
/* We are done modifying process list, so unblock signal */
1187
ret = (int)(TEMP_FAILURE_RETRY
1188
(sigprocmask(SIG_UNBLOCK,
1189
&sigchld_action.sa_mask, NULL)));
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1190
842
if(ret < 0){
1191
error(0, errno, "sigprocmask");
1192
exitstatus = EX_OSERR;
1193
goto fallback;
1194
}
1195
1196
if(plugin_list == NULL){
1197
break;
1198
}
1199
1200
continue;
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
851
}
1202
1203
852
/* This process exited nicely, so print its buffer */
1204
1205
bool bret = print_out_password(proc->buffer,
1206
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1207
855
if(not bret){
1208
error(0, errno, "print_out_password");
1209
exitstatus = EX_IOERR;
856
perror("print_out_password");
857
exitstatus = EXIT_FAILURE;
1210
858
}
1211
goto fallback;
859
goto end;
1212
860
}
1213
1214
861
/* This process has not completed. Does it have any output? */
1215
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1216
863
/* This process had nothing to say at this time */
1217
proc = proc->next;
1218
864
continue;
1219
865
}
1220
866
/* Before reading, make the process' data buffer large enough */
1221
867
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1222
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1223
+ (size_t) BUFFER_SIZE);
1224
if(new_buffer == NULL){
1225
error(0, errno, "malloc");
1226
exitstatus = EX_OSERR;
1227
goto fallback;
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;
1228
874
}
1229
proc->buffer = new_buffer;
1230
875
proc->buffer_size += BUFFER_SIZE;
1231
876
}
1232
877
/* Read from the process */
1233
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1234
proc->buffer
1235
+ proc->buffer_length,
1236
BUFFER_SIZE));
1237
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1238
881
/* Read error from this process; ignore the error */
1239
proc = proc->next;
1240
882
continue;
1241
883
}
1242
if(sret == 0){
884
if(ret == 0){
1243
885
/* got EOF */
1244
886
proc->eof = true;
1245
887
} else {
1246
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1247
889
}
1248
890
}
1249
891
}
1250
1251
1252
fallback:
1253
1254
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1255
and exitstatus != EX_OK)){
1256
/* Fallback if all plugins failed, none are found or an error
1257
occured */
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 */
1258
898
bool bret;
1259
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1260
900
char *passwordbuffer = getpass("Password: ");
1261
size_t len = strlen(passwordbuffer);
1262
/* Strip trailing newline */
1263
if(len > 0 and passwordbuffer[len-1] == '\n'){
1264
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1265
len--;
1266
}
1267
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1268
902
if(not bret){
1269
error(0, errno, "print_out_password");
1270
exitstatus = EX_IOERR;
903
perror("print_out_password");
904
exitstatus = EXIT_FAILURE;
905
goto end;
1271
906
}
1272
907
}
1273
908
1274
909
/* Restore old signal handler */
1275
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1276
if(ret == -1){
1277
error(0, errno, "sigaction");
1278
exitstatus = EX_OSERR;
1279
}
1280
1281
if(custom_argv != NULL){
1282
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1283
free(*arg);
1284
}
1285
free(custom_argv);
1286
}
1287
1288
free(direntries);
1289
1290
if(dir_fd != -1){
1291
close(dir_fd);
1292
}
1293
1294
/* Kill the processes */
1295
for(plugin *p = plugin_list; p != NULL; p = p->next){
1296
if(p->pid != 0){
1297
close(p->fd);
1298
ret = kill(p->pid, SIGTERM);
1299
if(ret == -1 and errno != ESRCH){
1300
/* Set-uid proccesses might not get closed */
1301
error(0, errno, "kill");
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);
1302
921
}
1303
922
}
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);
1304
942
}
1305
943
1306
944
/* Wait for any remaining child processes to terminate */
1307
do {
945
do{
1308
946
ret = wait(NULL);
1309
947
} while(ret >= 0);
1310
948
if(errno != ECHILD){
1311
error(0, errno, "wait");
949
perror("wait");
1312
950
}
1313
951
1314
free_plugin_list();
1315
1316
free(plugindir);
1317
free(pluginhelperdir);
1318
free(argfile);
1319
1320
952
return exitstatus;
1321
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0