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- Committer: Teddy Hogeborn
- Date: 2014-03-23 22:12:57 UTC
- Revision ID: teddy@recompile.se-20140323221257-9lkufevfdn4kwoq6
Use openat() etc. in plugin-runner. Also one less useless warning.
* plugin-runner.c (main): Only print warning about failure to work
around Debian bug #633582 if the plugin
directory actually exists. Use openat(),
fstat(), faccessat(), and eliminate
asprintf().
* plugin-runner.c (main): Only print warning about failure to work
around Debian bug #633582 if the plugin
directory actually exists. Use openat(),
fstat(), faccessat(), and eliminate
asprintf().
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- 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
5
* Copyright © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#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
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO, fclose() */
33
#include <sys/types.h> /* DIR, fdopendir(), fstat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), 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
WCOREDUMP() */
43
#include <sys/stat.h> /* struct stat, fstat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
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() */
47
#include <unistd.h> /* fcntl(), F_GETFD, F_SETFD,
48
FD_CLOEXEC, write(), STDOUT_FILENO,
49
struct stat, fstat(), close(),
50
setgid(), setuid(), S_ISREG(),
51
faccessat() pipe(), fork(),
52
_exit(), dup2(), fexecve(), read()
53
*/
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
55
FD_CLOEXEC, openat() */
56
#include <string.h> /* strsep, strlen(), strsignal(),
57
strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
73
struct process;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
77
78
#define PDIR "/lib/mandos/plugins.d"
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
86
83
87
84
typedef struct plugin{
88
85
char *name; /* can be NULL or any plugin name */
91
88
char **environ;
92
89
int envc;
93
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
94
101
struct plugin *next;
95
102
} plugin;
96
103
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
or (p->name and name and (strcmp(p->name, name) == 0))){
104
static plugin *plugin_list = NULL;
105
106
/* Gets an existing plugin based on name,
107
or if none is found, creates a new one */
108
__attribute__((warn_unused_result))
109
static plugin *getplugin(char *name){
110
/* Check for existing plugin with that name */
111
for(plugin *p = plugin_list; p != NULL; p = p->next){
112
if((p->name == name)
113
or (p->name and name and (strcmp(p->name, name) == 0))){
101
114
return p;
102
115
}
103
116
}
104
117
/* Create a new plugin */
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
118
plugin *new_plugin = NULL;
119
do {
120
new_plugin = malloc(sizeof(plugin));
121
} while(new_plugin == NULL and errno == EINTR);
122
if(new_plugin == NULL){
107
123
return NULL;
108
124
}
109
125
char *copy_name = NULL;
110
126
if(name != NULL){
111
copy_name = strdup(name);
127
do {
128
copy_name = strdup(name);
129
} while(copy_name == NULL and errno == EINTR);
112
130
if(copy_name == NULL){
131
int e = errno;
132
free(new_plugin);
133
errno = e;
113
134
return NULL;
114
135
}
115
136
}
116
137
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
138
*new_plugin = (plugin){ .name = copy_name,
139
.argc = 1,
140
.disabled = false,
141
.next = plugin_list };
122
142
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
143
do {
144
new_plugin->argv = malloc(sizeof(char *) * 2);
145
} while(new_plugin->argv == NULL and errno == EINTR);
146
if(new_plugin->argv == NULL){
147
int e = errno;
125
148
free(copy_name);
126
149
free(new_plugin);
150
errno = e;
127
151
return NULL;
128
152
}
129
153
new_plugin->argv[0] = copy_name;
130
154
new_plugin->argv[1] = NULL;
131
132
new_plugin->environ = malloc(sizeof(char *));
155
156
do {
157
new_plugin->environ = malloc(sizeof(char *));
158
} while(new_plugin->environ == NULL and errno == EINTR);
133
159
if(new_plugin->environ == NULL){
160
int e = errno;
134
161
free(copy_name);
135
162
free(new_plugin->argv);
136
163
free(new_plugin);
164
errno = e;
137
165
return NULL;
138
166
}
139
167
new_plugin->environ[0] = NULL;
168
140
169
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
170
plugin_list = new_plugin;
142
171
return new_plugin;
143
172
}
144
173
145
174
/* Helper function for add_argument and add_environment */
175
__attribute__((nonnull, warn_unused_result))
146
176
static bool add_to_char_array(const char *new, char ***array,
147
177
int *len){
148
178
/* Resize the pointed-to array to hold one more pointer */
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
179
char **new_array = NULL;
180
do {
181
new_array = realloc(*array, sizeof(char *)
182
* (size_t) ((*len) + 2));
183
} while(new_array == NULL and errno == EINTR);
151
184
/* Malloc check */
152
if(*array == NULL){
185
if(new_array == NULL){
153
186
return false;
154
187
}
188
*array = new_array;
155
189
/* Make a copy of the new string */
156
char *copy = strdup(new);
190
char *copy;
191
do {
192
copy = strdup(new);
193
} while(copy == NULL and errno == EINTR);
157
194
if(copy == NULL){
158
195
return false;
159
196
}
166
203
}
167
204
168
205
/* Add to a plugin's argument vector */
206
__attribute__((nonnull(2), warn_unused_result))
169
207
static bool add_argument(plugin *p, const char *arg){
170
208
if(p == NULL){
171
209
return false;
174
212
}
175
213
176
214
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
215
__attribute__((nonnull(2), warn_unused_result))
216
static bool add_environment(plugin *p, const char *def, bool replace){
178
217
if(p == NULL){
179
218
return false;
180
219
}
220
/* namelen = length of name of environment variable */
221
size_t namelen = (size_t)(strchrnul(def, '=') - def);
222
/* Search for this environment variable */
223
for(char **envdef = p->environ; *envdef != NULL; envdef++){
224
if(strncmp(*envdef, def, namelen + 1) == 0){
225
/* It already exists */
226
if(replace){
227
char *new_envdef;
228
do {
229
new_envdef = realloc(*envdef, strlen(def) + 1);
230
} while(new_envdef == NULL and errno == EINTR);
231
if(new_envdef == NULL){
232
return false;
233
}
234
*envdef = new_envdef;
235
strcpy(*envdef, def);
236
}
237
return true;
238
}
239
}
181
240
return add_to_char_array(def, &(p->environ), &(p->envc));
182
241
}
183
242
184
185
243
/*
186
244
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
245
* Descriptor Flags".
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
246
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
189
247
*/
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
248
__attribute__((warn_unused_result))
249
static int set_cloexec_flag(int fd){
250
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
193
251
/* If reading the flags failed, return error indication now. */
194
252
if(ret < 0){
195
253
return ret;
196
254
}
197
255
/* Store modified flag word in the descriptor. */
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
256
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
257
ret | FD_CLOEXEC));
199
258
}
200
259
201
process *process_list = NULL;
202
260
203
261
/* Mark processes as completed when they exit, and save their exit
204
262
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
263
static void handle_sigchld(__attribute__((unused)) int sig){
264
int old_errno = errno;
206
265
while(true){
207
process *proc = process_list;
266
plugin *proc = plugin_list;
208
267
int status;
209
268
pid_t pid = waitpid(-1, &status, WNOHANG);
210
269
if(pid == 0){
212
271
break;
213
272
}
214
273
if(pid == -1){
215
if (errno != ECHILD){
216
perror("waitpid");
274
if(errno == ECHILD){
275
/* No child processes */
276
break;
217
277
}
218
/* No child processes */
219
break;
278
error(0, errno, "waitpid");
220
279
}
221
280
222
281
/* A child exited, find it in process_list */
223
282
while(proc != NULL and proc->pid != pid){
224
283
proc = proc->next;
228
287
continue;
229
288
}
230
289
proc->status = status;
231
proc->completed = true;
290
proc->completed = 1;
232
291
}
292
errno = old_errno;
233
293
}
234
294
235
bool print_out_password(const char *buffer, size_t length){
295
/* Prints out a password to stdout */
296
__attribute__((nonnull, warn_unused_result))
297
static bool print_out_password(const char *buffer, size_t length){
236
298
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
299
for(size_t written = 0; written < length; written += (size_t)ret){
241
300
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
301
length - written));
247
306
return true;
248
307
}
249
308
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
return NULL;
309
/* Removes and free a plugin from the plugin list */
310
__attribute__((nonnull))
311
static void free_plugin(plugin *plugin_node){
312
313
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
314
free(*arg);
315
}
316
free(plugin_node->argv);
317
for(char **env = plugin_node->environ; *env != NULL; env++){
318
free(*env);
319
}
320
free(plugin_node->environ);
321
free(plugin_node->buffer);
322
323
/* Removes the plugin from the singly-linked list */
324
if(plugin_node == plugin_list){
325
/* First one - simple */
326
plugin_list = plugin_list->next;
327
} else {
328
/* Second one or later */
329
for(plugin *p = plugin_list; p != NULL; p = p->next){
330
if(p->next == plugin_node){
331
p->next = plugin_node->next;
332
break;
333
}
256
334
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before
258
parsing */
259
argv[1] = NULL;
260
}
261
*argc += 1;
262
argv = realloc(argv, sizeof(char *)
263
* ((unsigned int) *argc + 1));
264
if(argv == NULL){
265
return NULL;
266
}
267
argv[*argc-1] = arg;
268
argv[*argc] = NULL;
269
return argv;
335
}
336
337
free(plugin_node);
270
338
}
271
339
272
static void free_plugin_list(plugin *plugin_list){
273
for(plugin *next; plugin_list != NULL; plugin_list = next){
274
next = plugin_list->next;
275
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
276
free(*arg);
277
}
278
free(plugin_list->argv);
279
for(char **env = plugin_list->environ; *env != NULL; env++){
280
free(*env);
281
}
282
free(plugin_list->environ);
283
free(plugin_list);
340
static void free_plugin_list(void){
341
while(plugin_list != NULL){
342
free_plugin(plugin_list);
284
343
}
285
344
}
286
345
287
346
int main(int argc, char *argv[]){
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
347
char *plugindir = NULL;
348
char *argfile = NULL;
290
349
FILE *conffp;
291
350
size_t d_name_len;
292
351
DIR *dir = NULL;
294
353
struct stat st;
295
354
fd_set rfds_all;
296
355
int ret, maxfd = 0;
356
ssize_t sret;
297
357
uid_t uid = 65534;
298
358
gid_t gid = 65534;
299
359
bool debug = false;
303
363
.sa_flags = SA_NOCLDSTOP };
304
364
char **custom_argv = NULL;
305
365
int custom_argc = 0;
366
int dir_fd;
306
367
307
368
/* Establish a signal handler */
308
369
sigemptyset(&sigchld_action.sa_mask);
309
370
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
310
371
if(ret == -1){
311
perror("sigaddset");
312
exitstatus = EXIT_FAILURE;
372
error(0, errno, "sigaddset");
373
exitstatus = EX_OSERR;
313
374
goto fallback;
314
375
}
315
376
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
316
377
if(ret == -1){
317
perror("sigaction");
318
exitstatus = EXIT_FAILURE;
378
error(0, errno, "sigaction");
379
exitstatus = EX_OSERR;
319
380
goto fallback;
320
381
}
321
382
324
385
{ .name = "global-options", .key = 'g',
325
386
.arg = "OPTION[,OPTION[,...]]",
326
387
.doc = "Options passed to all plugins" },
327
{ .name = "global-envs", .key = 'e',
388
{ .name = "global-env", .key = 'G',
328
389
.arg = "VAR=value",
329
390
.doc = "Environment variable passed to all plugins" },
330
391
{ .name = "options-for", .key = 'o',
331
392
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
332
393
.doc = "Options passed only to specified plugin" },
333
{ .name = "envs-for", .key = 'f',
394
{ .name = "env-for", .key = 'E',
334
395
.arg = "PLUGIN:ENV=value",
335
396
.doc = "Environment variable passed to specified plugin" },
336
397
{ .name = "disable", .key = 'd',
337
398
.arg = "PLUGIN",
338
399
.doc = "Disable a specific plugin", .group = 1 },
400
{ .name = "enable", .key = 'e',
401
.arg = "PLUGIN",
402
.doc = "Enable a specific plugin", .group = 1 },
339
403
{ .name = "plugin-dir", .key = 128,
340
404
.arg = "DIRECTORY",
341
405
.doc = "Specify a different plugin directory", .group = 2 },
342
{ .name = "userid", .key = 129,
343
.arg = "ID", .flags = 0,
344
.doc = "User ID the plugins will run as", .group = 2 },
345
{ .name = "groupid", .key = 130,
346
.arg = "ID", .flags = 0,
347
.doc = "Group ID the plugins will run as", .group = 2 },
348
{ .name = "debug", .key = 131,
349
.doc = "Debug mode", .group = 3 },
406
{ .name = "config-file", .key = 129,
407
.arg = "FILE",
408
.doc = "Specify a different configuration file", .group = 2 },
409
{ .name = "userid", .key = 130,
410
.arg = "ID", .flags = 0,
411
.doc = "User ID the plugins will run as", .group = 3 },
412
{ .name = "groupid", .key = 131,
413
.arg = "ID", .flags = 0,
414
.doc = "Group ID the plugins will run as", .group = 3 },
415
{ .name = "debug", .key = 132,
416
.doc = "Debug mode", .group = 4 },
417
/*
418
* These reproduce what we would get without ARGP_NO_HELP
419
*/
420
{ .name = "help", .key = '?',
421
.doc = "Give this help list", .group = -1 },
422
{ .name = "usage", .key = -3,
423
.doc = "Give a short usage message", .group = -1 },
424
{ .name = "version", .key = 'V',
425
.doc = "Print program version", .group = -1 },
350
426
{ .name = NULL }
351
427
};
352
428
353
error_t parse_opt (int key, char *arg, struct argp_state *state) {
354
/* Get the INPUT argument from `argp_parse', which we know is a
355
pointer to our plugin list pointer. */
356
plugin **plugins = state->input;
357
switch (key) {
358
case 'g':
359
if (arg != NULL){
360
char *p;
361
while((p = strsep(&arg, ",")) != NULL){
362
if(p[0] == '\0'){
363
continue;
364
}
365
if(not add_argument(getplugin(NULL, plugins), p)){
366
perror("add_argument");
367
return ARGP_ERR_UNKNOWN;
368
}
369
}
370
}
371
break;
372
case 'e':
373
if(arg == NULL){
374
break;
375
}
376
{
377
char *envdef = strdup(arg);
378
if(envdef == NULL){
379
break;
380
}
381
if(not add_environment(getplugin(NULL, plugins), envdef)){
382
perror("add_environment");
383
}
384
}
385
break;
386
case 'o':
387
if (arg != NULL){
388
char *p_name = strsep(&arg, ":");
389
if(p_name[0] == '\0'){
390
break;
391
}
392
char *opt = strsep(&arg, ":");
393
if(opt[0] == '\0'){
394
break;
395
}
396
if(opt != NULL){
397
char *p;
398
while((p = strsep(&opt, ",")) != NULL){
399
if(p[0] == '\0'){
400
continue;
401
}
402
if(not add_argument(getplugin(p_name, plugins), p)){
403
perror("add_argument");
404
return ARGP_ERR_UNKNOWN;
405
}
406
}
407
}
408
}
409
break;
410
case 'f':
411
if(arg == NULL){
412
break;
413
}
429
__attribute__((nonnull(3)))
430
error_t parse_opt(int key, char *arg, struct argp_state *state){
431
errno = 0;
432
switch(key){
433
char *tmp;
434
intmax_t tmp_id;
435
case 'g': /* --global-options */
436
{
437
char *plugin_option;
438
while((plugin_option = strsep(&arg, ",")) != NULL){
439
if(not add_argument(getplugin(NULL), plugin_option)){
440
break;
441
}
442
}
443
errno = 0;
444
}
445
break;
446
case 'G': /* --global-env */
447
if(add_environment(getplugin(NULL), arg, true)){
448
errno = 0;
449
}
450
break;
451
case 'o': /* --options-for */
452
{
453
char *option_list = strchr(arg, ':');
454
if(option_list == NULL){
455
argp_error(state, "No colon in \"%s\"", arg);
456
errno = EINVAL;
457
break;
458
}
459
*option_list = '\0';
460
option_list++;
461
if(arg[0] == '\0'){
462
argp_error(state, "Empty plugin name");
463
errno = EINVAL;
464
break;
465
}
466
char *option;
467
while((option = strsep(&option_list, ",")) != NULL){
468
if(not add_argument(getplugin(arg), option)){
469
break;
470
}
471
}
472
errno = 0;
473
}
474
break;
475
case 'E': /* --env-for */
414
476
{
415
477
char *envdef = strchr(arg, ':');
416
478
if(envdef == NULL){
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
479
argp_error(state, "No colon in \"%s\"", arg);
480
errno = EINVAL;
481
break;
482
}
483
*envdef = '\0';
423
484
envdef++;
424
if(not add_environment(getplugin(p_name, plugins), envdef)){
425
perror("add_environment");
426
}
427
}
428
break;
429
case 'd':
430
if (arg != NULL){
431
plugin *p = getplugin(arg, plugins);
432
if(p == NULL){
433
return ARGP_ERR_UNKNOWN;
434
}
435
p->disabled = true;
436
}
437
break;
438
case 128:
439
plugindir = arg;
440
break;
441
case 129:
442
uid = (uid_t)strtol(arg, NULL, 10);
443
break;
444
case 130:
445
gid = (gid_t)strtol(arg, NULL, 10);
446
break;
447
case 131:
485
if(arg[0] == '\0'){
486
argp_error(state, "Empty plugin name");
487
errno = EINVAL;
488
break;
489
}
490
if(add_environment(getplugin(arg), envdef, true)){
491
errno = 0;
492
}
493
}
494
break;
495
case 'd': /* --disable */
496
{
497
plugin *p = getplugin(arg);
498
if(p != NULL){
499
p->disabled = true;
500
errno = 0;
501
}
502
}
503
break;
504
case 'e': /* --enable */
505
{
506
plugin *p = getplugin(arg);
507
if(p != NULL){
508
p->disabled = false;
509
errno = 0;
510
}
511
}
512
break;
513
case 128: /* --plugin-dir */
514
free(plugindir);
515
plugindir = strdup(arg);
516
if(plugindir != NULL){
517
errno = 0;
518
}
519
break;
520
case 129: /* --config-file */
521
/* This is already done by parse_opt_config_file() */
522
break;
523
case 130: /* --userid */
524
tmp_id = strtoimax(arg, &tmp, 10);
525
if(errno != 0 or tmp == arg or *tmp != '\0'
526
or tmp_id != (uid_t)tmp_id){
527
argp_error(state, "Bad user ID number: \"%s\", using %"
528
PRIdMAX, arg, (intmax_t)uid);
529
break;
530
}
531
uid = (uid_t)tmp_id;
532
errno = 0;
533
break;
534
case 131: /* --groupid */
535
tmp_id = strtoimax(arg, &tmp, 10);
536
if(errno != 0 or tmp == arg or *tmp != '\0'
537
or tmp_id != (gid_t)tmp_id){
538
argp_error(state, "Bad group ID number: \"%s\", using %"
539
PRIdMAX, arg, (intmax_t)gid);
540
break;
541
}
542
gid = (gid_t)tmp_id;
543
errno = 0;
544
break;
545
case 132: /* --debug */
448
546
debug = true;
449
547
break;
450
case ARGP_KEY_ARG:
451
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
452
break;
453
case ARGP_KEY_END:
454
break;
455
default:
456
return ARGP_ERR_UNKNOWN;
457
}
458
return 0;
459
}
460
461
plugin *plugin_list = NULL;
462
463
struct argp argp = { .options = options, .parser = parse_opt,
464
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
548
/*
549
* These reproduce what we would get without ARGP_NO_HELP
550
*/
551
case '?': /* --help */
552
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
553
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
554
case -3: /* --usage */
555
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
556
argp_state_help(state, state->out_stream,
557
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
558
case 'V': /* --version */
559
fprintf(state->out_stream, "%s\n", argp_program_version);
560
exit(EXIT_SUCCESS);
561
break;
562
/*
563
* When adding more options before this line, remember to also add a
564
* "case" to the "parse_opt_config_file" function below.
565
*/
566
case ARGP_KEY_ARG:
567
/* Cryptsetup always passes an argument, which is an empty
568
string if "none" was specified in /etc/crypttab. So if
569
argument was empty, we ignore it silently. */
570
if(arg[0] == '\0'){
571
break;
572
}
573
default:
574
return ARGP_ERR_UNKNOWN;
575
}
576
return errno; /* Set to 0 at start */
577
}
578
579
/* This option parser is the same as parse_opt() above, except it
580
ignores everything but the --config-file option. */
581
error_t parse_opt_config_file(int key, char *arg,
582
__attribute__((unused))
583
struct argp_state *state){
584
errno = 0;
585
switch(key){
586
case 'g': /* --global-options */
587
case 'G': /* --global-env */
588
case 'o': /* --options-for */
589
case 'E': /* --env-for */
590
case 'd': /* --disable */
591
case 'e': /* --enable */
592
case 128: /* --plugin-dir */
593
break;
594
case 129: /* --config-file */
595
free(argfile);
596
argfile = strdup(arg);
597
if(argfile != NULL){
598
errno = 0;
599
}
600
break;
601
case 130: /* --userid */
602
case 131: /* --groupid */
603
case 132: /* --debug */
604
case '?': /* --help */
605
case -3: /* --usage */
606
case 'V': /* --version */
607
case ARGP_KEY_ARG:
608
break;
609
default:
610
return ARGP_ERR_UNKNOWN;
611
}
612
return errno;
613
}
614
615
struct argp argp = { .options = options,
616
.parser = parse_opt_config_file,
617
.args_doc = "",
465
618
.doc = "Mandos plugin runner -- Run plugins" };
466
619
467
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
468
if (ret == ARGP_ERR_UNKNOWN){
469
fprintf(stderr, "Unknown error while parsing arguments\n");
470
exitstatus = EXIT_FAILURE;
471
goto fallback;
472
}
473
474
conffp = fopen(argfile, "r");
620
/* Parse using parse_opt_config_file() in order to get the custom
621
config file location, if any. */
622
ret = argp_parse(&argp, argc, argv,
623
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
624
NULL, NULL);
625
switch(ret){
626
case 0:
627
break;
628
case ENOMEM:
629
default:
630
errno = ret;
631
error(0, errno, "argp_parse");
632
exitstatus = EX_OSERR;
633
goto fallback;
634
case EINVAL:
635
exitstatus = EX_USAGE;
636
goto fallback;
637
}
638
639
/* Reset to the normal argument parser */
640
argp.parser = parse_opt;
641
642
/* Open the configfile if available */
643
if(argfile == NULL){
644
conffp = fopen(AFILE, "r");
645
} else {
646
conffp = fopen(argfile, "r");
647
}
475
648
if(conffp != NULL){
476
649
char *org_line = NULL;
477
650
char *p, *arg, *new_arg, *line;
478
651
size_t size = 0;
479
ssize_t sret;
480
652
const char whitespace_delims[] = " \r\t\f\v\n";
481
653
const char comment_delim[] = "#";
482
654
655
custom_argc = 1;
656
custom_argv = malloc(sizeof(char*) * 2);
657
if(custom_argv == NULL){
658
error(0, errno, "malloc");
659
exitstatus = EX_OSERR;
660
goto fallback;
661
}
662
custom_argv[0] = argv[0];
663
custom_argv[1] = NULL;
664
665
/* for each line in the config file, strip whitespace and ignore
666
commented text */
483
667
while(true){
484
668
sret = getline(&org_line, &size, conffp);
485
669
if(sret == -1){
486
670
break;
487
671
}
488
672
489
673
line = org_line;
490
674
arg = strsep(&line, comment_delim);
491
675
while((p = strsep(&arg, whitespace_delims)) != NULL){
493
677
continue;
494
678
}
495
679
new_arg = strdup(p);
496
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
497
if (custom_argv == NULL){
498
perror("add_to_argv");
499
exitstatus = EXIT_FAILURE;
680
if(new_arg == NULL){
681
error(0, errno, "strdup");
682
exitstatus = EX_OSERR;
683
free(org_line);
500
684
goto fallback;
501
685
}
686
687
custom_argc += 1;
688
{
689
char **new_argv = realloc(custom_argv, sizeof(char *)
690
* ((unsigned int)
691
custom_argc + 1));
692
if(new_argv == NULL){
693
error(0, errno, "realloc");
694
exitstatus = EX_OSERR;
695
free(new_arg);
696
free(org_line);
697
goto fallback;
698
} else {
699
custom_argv = new_argv;
700
}
701
}
702
custom_argv[custom_argc-1] = new_arg;
703
custom_argv[custom_argc] = NULL;
502
704
}
503
705
}
706
do {
707
ret = fclose(conffp);
708
} while(ret == EOF and errno == EINTR);
709
if(ret == EOF){
710
error(0, errno, "fclose");
711
exitstatus = EX_IOERR;
712
goto fallback;
713
}
504
714
free(org_line);
505
} else{
715
} else {
506
716
/* Check for harmful errors and go to fallback. Other errors might
507
717
not affect opening plugins */
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
509
perror("fopen");
510
exitstatus = EXIT_FAILURE;
718
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
719
error(0, errno, "fopen");
720
exitstatus = EX_OSERR;
511
721
goto fallback;
512
722
}
513
723
}
514
724
/* If there were any arguments from the configuration file, pass
725
them to parser as command line arguments */
515
726
if(custom_argv != NULL){
516
custom_argv[0] = argv[0];
517
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0,
518
&plugin_list);
519
if (ret == ARGP_ERR_UNKNOWN){
520
fprintf(stderr, "Unknown error while parsing arguments\n");
521
exitstatus = EXIT_FAILURE;
727
ret = argp_parse(&argp, custom_argc, custom_argv,
728
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
729
NULL, NULL);
730
switch(ret){
731
case 0:
732
break;
733
case ENOMEM:
734
default:
735
errno = ret;
736
error(0, errno, "argp_parse");
737
exitstatus = EX_OSERR;
738
goto fallback;
739
case EINVAL:
740
exitstatus = EX_CONFIG;
522
741
goto fallback;
523
742
}
524
743
}
525
744
745
/* Parse actual command line arguments, to let them override the
746
config file */
747
ret = argp_parse(&argp, argc, argv,
748
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
749
NULL, NULL);
750
switch(ret){
751
case 0:
752
break;
753
case ENOMEM:
754
default:
755
errno = ret;
756
error(0, errno, "argp_parse");
757
exitstatus = EX_OSERR;
758
goto fallback;
759
case EINVAL:
760
exitstatus = EX_USAGE;
761
goto fallback;
762
}
763
526
764
if(debug){
527
765
for(plugin *p = plugin_list; p != NULL; p=p->next){
528
766
fprintf(stderr, "Plugin: %s has %d arguments\n",
530
768
for(char **a = p->argv; *a != NULL; a++){
531
769
fprintf(stderr, "\tArg: %s\n", *a);
532
770
}
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
771
fprintf(stderr, "...and %d environment variables\n", p->envc);
534
772
for(char **a = p->environ; *a != NULL; a++){
535
773
fprintf(stderr, "\t%s\n", *a);
536
774
}
537
775
}
538
776
}
539
777
778
if(getuid() == 0){
779
/* Work around Debian bug #633582:
780
<http://bugs.debian.org/633582> */
781
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
782
if(plugindir_fd == -1){
783
if(errno != ENOENT){
784
error(0, errno, "open(\"" PDIR "\")");
785
}
786
} else {
787
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
788
if(ret == -1){
789
error(0, errno, "fstat");
790
} else {
791
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
792
ret = fchown(plugindir_fd, uid, gid);
793
if(ret == -1){
794
error(0, errno, "fchown");
795
}
796
}
797
}
798
TEMP_FAILURE_RETRY(close(plugindir_fd));
799
}
800
}
801
802
/* Lower permissions */
803
ret = setgid(gid);
804
if(ret == -1){
805
error(0, errno, "setgid");
806
}
540
807
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
545
setgid(gid);
546
if (ret == -1){
547
perror("setgid");
548
}
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
555
}
556
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
808
if(ret == -1){
809
error(0, errno, "setuid");
810
}
811
812
/* Open plugin directory with close_on_exec flag */
558
813
{
559
int dir_fd = dirfd(dir);
560
if(dir_fd >= 0){
561
ret = set_cloexec_flag(dir_fd);
562
if(ret < 0){
563
perror("set_cloexec_flag");
564
exitstatus = EXIT_FAILURE;
565
goto fallback;
566
}
814
dir_fd = open(plugindir != NULL ? plugindir : PDIR, O_RDONLY |
815
#ifdef O_CLOEXEC
816
O_CLOEXEC
817
#else /* not O_CLOEXEC */
818
0
819
#endif /* not O_CLOEXEC */
820
);
821
if(dir_fd == -1){
822
error(0, errno, "Could not open plugin dir");
823
exitstatus = EX_UNAVAILABLE;
824
goto fallback;
825
}
826
827
#ifndef O_CLOEXEC
828
/* Set the FD_CLOEXEC flag on the directory */
829
ret = set_cloexec_flag(dir_fd);
830
if(ret < 0){
831
error(0, errno, "set_cloexec_flag");
832
TEMP_FAILURE_RETRY(close(dir_fd));
833
exitstatus = EX_OSERR;
834
goto fallback;
835
}
836
#endif /* O_CLOEXEC */
837
838
dir = fdopendir(dir_fd);
839
if(dir == NULL){
840
error(0, errno, "Could not open plugin dir");
841
TEMP_FAILURE_RETRY(close(dir_fd));
842
exitstatus = EX_OSERR;
843
goto fallback;
567
844
}
568
845
}
569
846
570
847
FD_ZERO(&rfds_all);
571
848
849
/* Read and execute any executable in the plugin directory*/
572
850
while(true){
573
dirst = readdir(dir);
851
do {
852
dirst = readdir(dir);
853
} while(dirst == NULL and errno == EINTR);
574
854
575
// All directory entries have been processed
855
/* All directory entries have been processed */
576
856
if(dirst == NULL){
577
if (errno == EBADF){
578
perror("readdir");
579
exitstatus = EXIT_FAILURE;
857
if(errno == EBADF){
858
error(0, errno, "readdir");
859
exitstatus = EX_IOERR;
580
860
goto fallback;
581
861
}
582
862
break;
584
864
585
865
d_name_len = strlen(dirst->d_name);
586
866
587
// Ignore dotfiles, backup files and other junk
867
/* Ignore dotfiles, backup files and other junk */
588
868
{
589
869
bool bad_name = false;
590
870
591
const char const *bad_prefixes[] = { ".", "#", NULL };
871
const char * const bad_prefixes[] = { ".", "#", NULL };
592
872
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
873
const char * const bad_suffixes[] = { "~", "#", ".dpkg-new",
594
874
".dpkg-old",
875
".dpkg-bak",
595
876
".dpkg-divert", NULL };
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
877
#ifdef __GNUC__
878
#pragma GCC diagnostic push
879
#pragma GCC diagnostic ignored "-Wcast-qual"
880
#endif
881
for(const char **pre = (const char **)bad_prefixes;
882
*pre != NULL; pre++){
883
#ifdef __GNUC__
884
#pragma GCC diagnostic pop
885
#endif
597
886
size_t pre_len = strlen(*pre);
598
887
if((d_name_len >= pre_len)
599
888
and strncmp((dirst->d_name), *pre, pre_len) == 0){
605
894
break;
606
895
}
607
896
}
608
609
897
if(bad_name){
610
898
continue;
611
899
}
612
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
900
#ifdef __GNUC__
901
#pragma GCC diagnostic push
902
#pragma GCC diagnostic ignored "-Wcast-qual"
903
#endif
904
for(const char **suf = (const char **)bad_suffixes;
905
*suf != NULL; suf++){
906
#ifdef __GNUC__
907
#pragma GCC diagnostic pop
908
#endif
614
909
size_t suf_len = strlen(*suf);
615
910
if((d_name_len >= suf_len)
616
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
911
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
617
912
== 0)){
618
913
if(debug){
619
914
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
628
923
continue;
629
924
}
630
925
}
631
632
char *filename;
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
926
927
int plugin_fd = openat(dir_fd, dirst->d_name, O_RDONLY |
928
#ifdef O_CLOEXEC
929
O_CLOEXEC
930
#else /* not O_CLOEXEC */
931
0
932
#endif /* not O_CLOEXEC */
933
);
934
if(plugin_fd == -1){
935
error(0, errno, "Could not open plugin");
936
continue;
937
}
938
#ifndef O_CLOEXEC
939
/* Set the FD_CLOEXEC flag on the plugin FD */
940
ret = set_cloexec_flag(plugin_fd);
634
941
if(ret < 0){
635
perror("asprintf");
636
continue;
637
}
638
639
ret = stat(filename, &st);
640
if (ret == -1){
641
perror("stat");
642
free(filename);
643
continue;
644
}
645
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
942
error(0, errno, "set_cloexec_flag");
943
TEMP_FAILURE_RETRY(close(plugin_fd));
944
continue;
945
}
946
#endif /* O_CLOEXEC */
947
ret = (int)TEMP_FAILURE_RETRY(fstat(plugin_fd, &st));
948
if(ret == -1){
949
error(0, errno, "stat");
950
TEMP_FAILURE_RETRY(close(plugin_fd));
951
continue;
952
}
953
954
/* Ignore non-executable files */
955
if(not S_ISREG(st.st_mode)
956
or (TEMP_FAILURE_RETRY(faccessat(dir_fd, dirst->d_name, X_OK,
957
0)) != 0)){
647
958
if(debug){
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
649
" with bad type or mode\n", filename);
959
fprintf(stderr, "Ignoring plugin dir entry \"%s/%s\""
960
" with bad type or mode\n",
961
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
650
962
}
651
free(filename);
963
TEMP_FAILURE_RETRY(close(plugin_fd));
652
964
continue;
653
965
}
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
966
967
plugin *p = getplugin(dirst->d_name);
655
968
if(p == NULL){
656
perror("getplugin");
657
free(filename);
969
error(0, errno, "getplugin");
970
TEMP_FAILURE_RETRY(close(plugin_fd));
658
971
continue;
659
972
}
660
973
if(p->disabled){
662
975
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
663
976
dirst->d_name);
664
977
}
665
free(filename);
978
TEMP_FAILURE_RETRY(close(plugin_fd));
666
979
continue;
667
980
}
668
981
{
669
982
/* Add global arguments to argument list for this plugin */
670
plugin *g = getplugin(NULL, &plugin_list);
983
plugin *g = getplugin(NULL);
671
984
if(g != NULL){
672
985
for(char **a = g->argv + 1; *a != NULL; a++){
673
986
if(not add_argument(p, *a)){
674
perror("add_argument");
987
error(0, errno, "add_argument");
675
988
}
676
989
}
677
990
/* Add global environment variables */
678
991
for(char **e = g->environ; *e != NULL; e++){
679
if(not add_environment(p, *e)){
680
perror("add_environment");
992
if(not add_environment(p, *e, false)){
993
error(0, errno, "add_environment");
681
994
}
682
995
}
683
996
}
684
997
}
685
/* If this plugin has any environment variables, we will call
686
using execve and need to duplicate the environment from this
687
process, too. */
998
/* If this plugin has any environment variables, we need to
999
duplicate the environment from this process, too. */
688
1000
if(p->environ[0] != NULL){
689
1001
for(char **e = environ; *e != NULL; e++){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
696
perror("add_environment");
1002
if(not add_environment(p, *e, false)){
1003
error(0, errno, "add_environment");
697
1004
}
698
1005
}
699
1006
}
700
1007
701
1008
int pipefd[2];
702
ret = pipe(pipefd);
703
if (ret == -1){
704
perror("pipe");
705
exitstatus = EXIT_FAILURE;
1009
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
1010
if(ret == -1){
1011
error(0, errno, "pipe");
1012
exitstatus = EX_OSERR;
706
1013
goto fallback;
707
1014
}
1015
/* Ask OS to automatic close the pipe on exec */
708
1016
ret = set_cloexec_flag(pipefd[0]);
709
1017
if(ret < 0){
710
perror("set_cloexec_flag");
711
exitstatus = EXIT_FAILURE;
1018
error(0, errno, "set_cloexec_flag");
1019
exitstatus = EX_OSERR;
712
1020
goto fallback;
713
1021
}
714
1022
ret = set_cloexec_flag(pipefd[1]);
715
1023
if(ret < 0){
716
perror("set_cloexec_flag");
717
exitstatus = EXIT_FAILURE;
1024
error(0, errno, "set_cloexec_flag");
1025
exitstatus = EX_OSERR;
718
1026
goto fallback;
719
1027
}
720
1028
/* Block SIGCHLD until process is safely in process list */
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1029
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
1030
&sigchld_action.sa_mask,
1031
NULL));
722
1032
if(ret < 0){
723
perror("sigprocmask");
724
exitstatus = EXIT_FAILURE;
1033
error(0, errno, "sigprocmask");
1034
exitstatus = EX_OSERR;
725
1035
goto fallback;
726
1036
}
727
// Starting a new process to be watched
728
pid_t pid = fork();
1037
/* Starting a new process to be watched */
1038
pid_t pid;
1039
do {
1040
pid = fork();
1041
} while(pid == -1 and errno == EINTR);
729
1042
if(pid == -1){
730
perror("fork");
731
exitstatus = EXIT_FAILURE;
1043
error(0, errno, "fork");
1044
exitstatus = EX_OSERR;
732
1045
goto fallback;
733
1046
}
734
1047
if(pid == 0){
735
1048
/* this is the child process */
736
1049
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
737
1050
if(ret < 0){
738
perror("sigaction");
739
_exit(EXIT_FAILURE);
1051
error(0, errno, "sigaction");
1052
_exit(EX_OSERR);
740
1053
}
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1054
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
742
1055
if(ret < 0){
743
perror("sigprocmask");
744
_exit(EXIT_FAILURE);
1056
error(0, errno, "sigprocmask");
1057
_exit(EX_OSERR);
745
1058
}
746
1059
747
1060
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
748
1061
if(ret == -1){
749
perror("dup2");
750
_exit(EXIT_FAILURE);
1062
error(0, errno, "dup2");
1063
_exit(EX_OSERR);
751
1064
}
752
1065
753
1066
if(dirfd(dir) < 0){
755
1068
above and must now close it manually here. */
756
1069
closedir(dir);
757
1070
}
758
if(p->environ[0] == NULL){
759
if(execv(filename, p->argv) < 0){
760
perror("execv");
761
_exit(EXIT_FAILURE);
762
}
763
} else {
764
if(execve(filename, p->argv, p->environ) < 0){
765
perror("execve");
766
_exit(EXIT_FAILURE);
767
}
1071
if(fexecve(plugin_fd, p->argv,
1072
(p->environ[0] != NULL) ? p->environ : environ) < 0){
1073
error(0, errno, "fexecve for %s/%s",
1074
plugindir != NULL ? plugindir : PDIR, dirst->d_name);
1075
_exit(EX_OSERR);
768
1076
}
769
1077
/* no return */
770
1078
}
771
/* parent process */
772
free(filename);
773
close(pipefd[1]); /* close unused write end of pipe */
774
process *new_process = malloc(sizeof(process));
775
if (new_process == NULL){
776
perror("malloc");
777
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1079
/* Parent process */
1080
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1081
pipe */
1082
TEMP_FAILURE_RETRY(close(plugin_fd));
1083
plugin *new_plugin = getplugin(dirst->d_name);
1084
if(new_plugin == NULL){
1085
error(0, errno, "getplugin");
1086
ret = (int)(TEMP_FAILURE_RETRY
1087
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1088
NULL)));
778
1089
if(ret < 0){
779
perror("sigprocmask");
1090
error(0, errno, "sigprocmask");
780
1091
}
781
exitstatus = EXIT_FAILURE;
1092
exitstatus = EX_OSERR;
782
1093
goto fallback;
783
1094
}
784
1095
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
1096
new_plugin->pid = pid;
1097
new_plugin->fd = pipefd[0];
1098
790
1099
/* Unblock SIGCHLD so signal handler can be run if this process
791
1100
has already completed */
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1101
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1102
&sigchld_action.sa_mask,
1103
NULL));
793
1104
if(ret < 0){
794
perror("sigprocmask");
795
exitstatus = EXIT_FAILURE;
1105
error(0, errno, "sigprocmask");
1106
exitstatus = EX_OSERR;
796
1107
goto fallback;
797
1108
}
798
1109
799
FD_SET(new_process->fd, &rfds_all);
1110
#if defined (__GNUC__) and defined (__GLIBC__)
1111
#if not __GLIBC_PREREQ(2, 16)
1112
#pragma GCC diagnostic push
1113
#pragma GCC diagnostic ignored "-Wsign-conversion"
1114
#endif
1115
#endif
1116
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1117
-Wconversion in GNU libc
1118
before 2.16 */
1119
#if defined (__GNUC__) and defined (__GLIBC__)
1120
#if not __GLIBC_PREREQ(2, 16)
1121
#pragma GCC diagnostic pop
1122
#endif
1123
#endif
800
1124
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
1125
if(maxfd < new_plugin->fd){
1126
maxfd = new_plugin->fd;
803
1127
}
804
805
1128
}
806
1129
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
1130
TEMP_FAILURE_RETRY(closedir(dir));
811
1131
dir = NULL;
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
1132
free_plugin(getplugin(NULL));
1133
1134
for(plugin *p = plugin_list; p != NULL; p = p->next){
1135
if(p->pid != 0){
1136
break;
1137
}
1138
if(p->next == NULL){
1139
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1140
" directory?\n");
1141
free_plugin_list();
1142
}
817
1143
}
818
while(process_list){
1144
1145
/* Main loop while running plugins exist */
1146
while(plugin_list){
819
1147
fd_set rfds = rfds_all;
820
1148
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
821
if (select_ret == -1){
822
perror("select");
823
exitstatus = EXIT_FAILURE;
1149
if(select_ret == -1 and errno != EINTR){
1150
error(0, errno, "select");
1151
exitstatus = EX_OSERR;
824
1152
goto fallback;
825
1153
}
826
1154
/* OK, now either a process completed, or something can be read
827
1155
from one of them */
828
for(process *proc = process_list; proc ; proc = proc->next){
1156
for(plugin *proc = plugin_list; proc != NULL;){
829
1157
/* Is this process completely done? */
830
if(proc->eof and proc->completed){
1158
if(proc->completed and proc->eof){
831
1159
/* Only accept the plugin output if it exited cleanly */
832
1160
if(not WIFEXITED(proc->status)
833
1161
or WEXITSTATUS(proc->status) != 0){
834
1162
/* Bad exit by plugin */
1163
835
1164
if(debug){
836
1165
if(WIFEXITED(proc->status)){
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1166
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1167
" status %d\n", proc->name,
1168
(intmax_t) (proc->pid),
839
1169
WEXITSTATUS(proc->status));
840
} else if(WIFSIGNALED(proc->status)) {
841
fprintf(stderr, "Plugin %u killed by signal %d\n",
842
(unsigned int) (proc->pid),
843
WTERMSIG(proc->status));
1170
} else if(WIFSIGNALED(proc->status)){
1171
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1172
" signal %d: %s\n", proc->name,
1173
(intmax_t) (proc->pid),
1174
WTERMSIG(proc->status),
1175
strsignal(WTERMSIG(proc->status)));
844
1176
} else if(WCOREDUMP(proc->status)){
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1177
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1178
" core\n", proc->name, (intmax_t) (proc->pid));
847
1179
}
848
1180
}
1181
849
1182
/* Remove the plugin */
850
FD_CLR(proc->fd, &rfds_all);
1183
#if defined (__GNUC__) and defined (__GLIBC__)
1184
#if not __GLIBC_PREREQ(2, 16)
1185
#pragma GCC diagnostic push
1186
#pragma GCC diagnostic ignored "-Wsign-conversion"
1187
#endif
1188
#endif
1189
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1190
-Wconversion in GNU libc
1191
before 2.16 */
1192
#if defined (__GNUC__) and defined (__GLIBC__)
1193
#if not __GLIBC_PREREQ(2, 16)
1194
#pragma GCC diagnostic pop
1195
#endif
1196
#endif
1197
851
1198
/* Block signal while modifying process_list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1199
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1200
(SIG_BLOCK,
1201
&sigchld_action.sa_mask,
1202
NULL));
853
1203
if(ret < 0){
854
perror("sigprocmask");
855
exitstatus = EXIT_FAILURE;
1204
error(0, errno, "sigprocmask");
1205
exitstatus = EX_OSERR;
856
1206
goto fallback;
857
1207
}
858
/* Delete this process entry from the list */
859
if(process_list == proc){
860
/* First one - simple */
861
process_list = proc->next;
862
} else {
863
/* Second one or later */
864
for(process *p = process_list; p != NULL; p = p->next){
865
if(p->next == proc){
866
p->next = proc->next;
867
break;
868
}
869
}
870
}
1208
1209
plugin *next_plugin = proc->next;
1210
free_plugin(proc);
1211
proc = next_plugin;
1212
871
1213
/* We are done modifying process list, so unblock signal */
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1214
ret = (int)(TEMP_FAILURE_RETRY
1215
(sigprocmask(SIG_UNBLOCK,
1216
&sigchld_action.sa_mask, NULL)));
874
1217
if(ret < 0){
875
perror("sigprocmask");
876
}
877
free(proc->buffer);
878
free(proc);
879
/* We deleted this process from the list, so we can't go
880
proc->next. Therefore, start over from the beginning of
881
the process list */
882
break;
1218
error(0, errno, "sigprocmask");
1219
exitstatus = EX_OSERR;
1220
goto fallback;
1221
}
1222
1223
if(plugin_list == NULL){
1224
break;
1225
}
1226
1227
continue;
883
1228
}
1229
884
1230
/* This process exited nicely, so print its buffer */
885
1231
886
1232
bool bret = print_out_password(proc->buffer,
887
1233
proc->buffer_length);
888
1234
if(not bret){
889
perror("print_out_password");
890
exitstatus = EXIT_FAILURE;
1235
error(0, errno, "print_out_password");
1236
exitstatus = EX_IOERR;
891
1237
}
892
1238
goto fallback;
893
1239
}
1240
894
1241
/* This process has not completed. Does it have any output? */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1242
#if defined (__GNUC__) and defined (__GLIBC__)
1243
#if not __GLIBC_PREREQ(2, 16)
1244
#pragma GCC diagnostic push
1245
#pragma GCC diagnostic ignored "-Wsign-conversion"
1246
#endif
1247
#endif
1248
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1249
warning from
1250
-Wconversion
1251
in GNU libc
1252
before
1253
2.16 */
1254
#if defined (__GNUC__) and defined (__GLIBC__)
1255
#if not __GLIBC_PREREQ(2, 16)
1256
#pragma GCC diagnostic pop
1257
#endif
1258
#endif
896
1259
/* This process had nothing to say at this time */
1260
proc = proc->next;
897
1261
continue;
898
1262
}
899
1263
/* Before reading, make the process' data buffer large enough */
900
1264
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
902
+ (size_t) BUFFER_SIZE);
903
if (proc->buffer == NULL){
904
perror("malloc");
905
exitstatus = EXIT_FAILURE;
1265
char *new_buffer = realloc(proc->buffer, proc->buffer_size
1266
+ (size_t) BUFFER_SIZE);
1267
if(new_buffer == NULL){
1268
error(0, errno, "malloc");
1269
exitstatus = EX_OSERR;
906
1270
goto fallback;
907
1271
}
1272
proc->buffer = new_buffer;
908
1273
proc->buffer_size += BUFFER_SIZE;
909
1274
}
910
1275
/* Read from the process */
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1276
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1277
proc->buffer
1278
+ proc->buffer_length,
1279
BUFFER_SIZE));
1280
if(sret < 0){
914
1281
/* Read error from this process; ignore the error */
1282
proc = proc->next;
915
1283
continue;
916
1284
}
917
if(ret == 0){
1285
if(sret == 0){
918
1286
/* got EOF */
919
1287
proc->eof = true;
920
1288
} else {
921
proc->buffer_length += (size_t) ret;
1289
proc->buffer_length += (size_t) sret;
922
1290
}
923
1291
}
924
1292
}
925
926
1293
1294
927
1295
fallback:
928
1296
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1297
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1298
and exitstatus != EX_OK)){
930
1299
/* Fallback if all plugins failed, none are found or an error
931
1300
occured */
932
1301
bool bret;
933
1302
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
934
1303
char *passwordbuffer = getpass("Password: ");
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1304
size_t len = strlen(passwordbuffer);
1305
/* Strip trailing newline */
1306
if(len > 0 and passwordbuffer[len-1] == '\n'){
1307
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1308
len--;
1309
}
1310
bret = print_out_password(passwordbuffer, len);
936
1311
if(not bret){
937
perror("print_out_password");
938
exitstatus = EXIT_FAILURE;
1312
error(0, errno, "print_out_password");
1313
exitstatus = EX_IOERR;
939
1314
}
940
1315
}
941
1316
942
1317
/* Restore old signal handler */
943
1318
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
944
1319
if(ret == -1){
945
perror("sigaction");
946
exitstatus = EXIT_FAILURE;
1320
error(0, errno, "sigaction");
1321
exitstatus = EX_OSERR;
947
1322
}
948
1323
949
1324
if(custom_argv != NULL){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1325
for(char **arg = custom_argv+1; *arg != NULL; arg++){
951
1326
free(*arg);
952
1327
}
953
1328
free(custom_argv);
954
1329
}
955
free_plugin_list(plugin_list);
956
1330
957
1331
if(dir != NULL){
958
1332
closedir(dir);
959
1333
}
960
1334
961
/* Free the process list and kill the processes */
962
for(process *next; process_list != NULL; process_list = next){
963
next = process_list->next;
964
close(process_list->fd);
965
ret = kill(process_list->pid, SIGTERM);
966
if(ret == -1 and errno != ESRCH){
967
/* set-uid proccesses migth not get closed */
968
perror("kill");
1335
/* Kill the processes */
1336
for(plugin *p = plugin_list; p != NULL; p = p->next){
1337
if(p->pid != 0){
1338
close(p->fd);
1339
ret = kill(p->pid, SIGTERM);
1340
if(ret == -1 and errno != ESRCH){
1341
/* Set-uid proccesses might not get closed */
1342
error(0, errno, "kill");
1343
}
969
1344
}
970
free(process_list->buffer);
971
free(process_list);
972
1345
}
973
1346
974
1347
/* Wait for any remaining child processes to terminate */
975
do{
1348
do {
976
1349
ret = wait(NULL);
977
1350
} while(ret >= 0);
978
1351
if(errno != ECHILD){
979
perror("wait");
1352
error(0, errno, "wait");
980
1353
}
981
1354
1355
free_plugin_list();
1356
1357
free(plugindir);
1358
free(argfile);
1359
982
1360
return exitstatus;
983
1361
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0