To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugin-runner.c
- browse files at revision 105
- compare with another revision
- download diff
- download tarball
- view history from revision 105
- Committer: Teddy Hogeborn
- Date: 2008-08-25 06:44:13 UTC
- Revision ID: teddy@fukt.bsnet.se-20080825064413-smqg5qwxfvhkeop4
* Makefile (DOCBOOKTOMAN): Only cd to one directory.
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
* mandos-options.xml (interface): Removed mention of a specific
replaceable.
(debug): Reworded slightly.
* mandos.conf.xml (OPTIONS): Renamed some replaceable names.
* mandos.xml (SYNOPSIS, OPTIONS): Renamed replaceable of "interface"
from "IF" to "NAME".
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
23
22
*/
24
23
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf(), O_CLOEXEC */
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> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
36
35
uid_t, gid_t, getuid(), getgid(),
38
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
39
38
FD_SET(), FD_ISSET(), FD_CLR */
40
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
40
WEXITSTATUS() */
43
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
42
#include <iso646.h> /* and, or, not */
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
46
44
readdir(), closedir(), dirfd() */
47
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
48
46
fcntl(), setuid(), setgid(),
49
47
F_GETFD, F_SETFD, FD_CLOEXEC,
50
48
access(), pipe(), fork(), close()
51
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
52
50
execv(), write(), read(),
53
51
close() */
54
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
55
53
FD_CLOEXEC */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
58
55
#include <errno.h> /* errno */
59
56
#include <argp.h> /* struct argp_option, struct
60
57
argp_state, struct argp,
64
61
#include <signal.h> /* struct sigaction, sigemptyset(),
65
62
sigaddset(), sigaction(),
66
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
64
SIG_UNBLOCK, kill() */
69
65
#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
66
74
67
#define BUFFER_SIZE 256
75
76
#define PDIR "/lib/mandos/plugins.d"
77
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
78
79
const char *argp_program_version = "plugin-runner " VERSION;
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
const char *argp_program_version = "plugin-runner 1.0";
80
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
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;
86
82
87
typedef struct plugin{
83
88
char *name; /* can be NULL or any plugin name */
84
89
char **argv;
86
91
char **environ;
87
92
int envc;
88
93
bool disabled;
89
90
/* Variables used for running processes*/
91
pid_t pid;
92
int fd;
93
char *buffer;
94
size_t buffer_size;
95
size_t buffer_length;
96
bool eof;
97
volatile sig_atomic_t completed;
98
int status;
99
94
struct plugin *next;
100
95
} plugin;
101
96
102
static plugin *plugin_list = NULL;
103
104
/* Gets an existing plugin based on name,
105
or if none is found, creates a new one */
106
static plugin *getplugin(char *name){
107
/* Check for existing plugin with that name */
108
for(plugin *p = plugin_list; p != NULL; p = p->next){
109
if((p->name == name)
110
or (p->name and name and (strcmp(p->name, name) == 0))){
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))){
111
101
return p;
112
102
}
113
103
}
114
104
/* Create a new plugin */
115
plugin *new_plugin = NULL;
116
do {
117
new_plugin = malloc(sizeof(plugin));
118
} while(new_plugin == NULL and errno == EINTR);
119
if(new_plugin == NULL){
105
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
120
107
return NULL;
121
108
}
122
109
char *copy_name = NULL;
123
110
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
111
copy_name = strdup(name);
127
112
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
113
return NULL;
132
114
}
133
115
}
134
116
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
117
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
139
122
140
do {
141
new_plugin->argv = malloc(sizeof(char *) * 2);
142
} while(new_plugin->argv == NULL and errno == EINTR);
143
if(new_plugin->argv == NULL){
144
int e = errno;
123
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
145
125
free(copy_name);
146
126
free(new_plugin);
147
errno = e;
148
127
return NULL;
149
128
}
150
129
new_plugin->argv[0] = copy_name;
151
130
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
131
132
new_plugin->environ = malloc(sizeof(char *));
156
133
if(new_plugin->environ == NULL){
157
int e = errno;
158
134
free(copy_name);
159
135
free(new_plugin->argv);
160
136
free(new_plugin);
161
errno = e;
162
137
return NULL;
163
138
}
164
139
new_plugin->environ[0] = NULL;
165
166
140
/* Append the new plugin to the list */
167
plugin_list = new_plugin;
141
*plugin_list = new_plugin;
168
142
return new_plugin;
169
143
}
170
144
172
146
static bool add_to_char_array(const char *new, char ***array,
173
147
int *len){
174
148
/* Resize the pointed-to array to hold one more pointer */
175
do {
176
*array = realloc(*array, sizeof(char *)
177
* (size_t) ((*len) + 2));
178
} while(*array == NULL and errno == EINTR);
149
*array = realloc(*array, sizeof(char *)
150
* (size_t) ((*len) + 2));
179
151
/* Malloc check */
180
152
if(*array == NULL){
181
153
return false;
182
154
}
183
155
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
156
char *copy = strdup(new);
188
157
if(copy == NULL){
189
158
return false;
190
159
}
205
174
}
206
175
207
176
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
177
static bool add_environment(plugin *p, const char *def){
209
178
if(p == NULL){
210
179
return false;
211
180
}
212
/* namelen = length of name of environment variable */
213
size_t namelen = (size_t)(strchrnul(def, '=') - def);
214
/* Search for this environment variable */
215
for(char **e = p->environ; *e != NULL; e++){
216
if(strncmp(*e, def, namelen + 1) == 0){
217
/* It already exists */
218
if(replace){
219
char *new;
220
do {
221
new = realloc(*e, strlen(def) + 1);
222
} while(new == NULL and errno == EINTR);
223
if(new == NULL){
224
return false;
225
}
226
*e = new;
227
strcpy(*e, def);
228
}
229
return true;
230
}
231
}
232
181
return add_to_char_array(def, &(p->environ), &(p->envc));
233
182
}
234
183
184
235
185
/*
236
186
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
187
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
188
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
189
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
190
static int set_cloexec_flag(int fd)
191
{
192
int ret = fcntl(fd, F_GETFD, 0);
242
193
/* If reading the flags failed, return error indication now. */
243
194
if(ret < 0){
244
195
return ret;
245
196
}
246
197
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
198
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
199
}
250
200
201
process *process_list = NULL;
251
202
252
203
/* Mark processes as completed when they exit, and save their exit
253
204
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
205
void handle_sigchld(__attribute__((unused)) int sig){
256
206
while(true){
257
plugin *proc = plugin_list;
207
process *proc = process_list;
258
208
int status;
259
209
pid_t pid = waitpid(-1, &status, WNOHANG);
260
210
if(pid == 0){
262
212
break;
263
213
}
264
214
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
215
if (errno != ECHILD){
216
perror("waitpid");
268
217
}
269
perror("waitpid");
218
/* No child processes */
219
break;
270
220
}
271
221
272
222
/* A child exited, find it in process_list */
273
223
while(proc != NULL and proc->pid != pid){
274
224
proc = proc->next;
278
228
continue;
279
229
}
280
230
proc->status = status;
281
proc->completed = 1;
231
proc->completed = true;
282
232
}
283
errno = old_errno;
284
233
}
285
234
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
235
bool print_out_password(const char *buffer, size_t length){
288
236
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
289
240
for(size_t written = 0; written < length; written += (size_t)ret){
290
241
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
242
length - written));
296
247
return true;
297
248
}
298
249
299
/* Removes and free a plugin from the plugin list */
300
static void free_plugin(plugin *plugin_node){
301
302
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
303
free(*arg);
304
}
305
free(plugin_node->argv);
306
for(char **env = plugin_node->environ; *env != NULL; env++){
307
free(*env);
308
}
309
free(plugin_node->environ);
310
free(plugin_node->buffer);
311
312
/* Removes the plugin from the singly-linked list */
313
if(plugin_node == plugin_list){
314
/* First one - simple */
315
plugin_list = plugin_list->next;
316
} else {
317
/* Second one or later */
318
for(plugin *p = plugin_list; p != NULL; p = p->next){
319
if(p->next == plugin_node){
320
p->next = plugin_node->next;
321
break;
322
}
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;
323
256
}
324
}
325
326
free(plugin_node);
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;
327
270
}
328
271
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
free_plugin(plugin_list);
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);
332
284
}
333
285
}
334
286
335
287
int main(int argc, char *argv[]){
336
char *plugindir = NULL;
337
char *argfile = NULL;
288
const char *plugindir = "/lib/mandos/plugins.d";
289
const char *argfile = ARGFILE;
338
290
FILE *conffp;
339
291
size_t d_name_len;
340
292
DIR *dir = NULL;
342
294
struct stat st;
343
295
fd_set rfds_all;
344
296
int ret, maxfd = 0;
345
ssize_t sret;
346
297
uid_t uid = 65534;
347
298
gid_t gid = 65534;
348
299
bool debug = false;
358
309
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
310
if(ret == -1){
360
311
perror("sigaddset");
361
exitstatus = EX_OSERR;
312
exitstatus = EXIT_FAILURE;
362
313
goto fallback;
363
314
}
364
315
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
316
if(ret == -1){
366
317
perror("sigaction");
367
exitstatus = EX_OSERR;
318
exitstatus = EXIT_FAILURE;
368
319
goto fallback;
369
320
}
370
321
373
324
{ .name = "global-options", .key = 'g',
374
325
.arg = "OPTION[,OPTION[,...]]",
375
326
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
327
{ .name = "global-envs", .key = 'e',
377
328
.arg = "VAR=value",
378
329
.doc = "Environment variable passed to all plugins" },
379
330
{ .name = "options-for", .key = 'o',
380
331
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
332
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
333
{ .name = "envs-for", .key = 'f',
383
334
.arg = "PLUGIN:ENV=value",
384
335
.doc = "Environment variable passed to specified plugin" },
385
336
{ .name = "disable", .key = 'd',
386
337
.arg = "PLUGIN",
387
338
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
339
{ .name = "plugin-dir", .key = 128,
392
340
.arg = "DIRECTORY",
393
341
.doc = "Specify a different plugin directory", .group = 2 },
394
{ .name = "config-file", .key = 129,
395
.arg = "FILE",
396
.doc = "Specify a different configuration file", .group = 2 },
397
{ .name = "userid", .key = 130,
398
.arg = "ID", .flags = 0,
399
.doc = "User ID the plugins will run as", .group = 3 },
400
{ .name = "groupid", .key = 131,
401
.arg = "ID", .flags = 0,
402
.doc = "Group ID the plugins will run as", .group = 3 },
403
{ .name = "debug", .key = 132,
404
.doc = "Debug mode", .group = 4 },
405
/*
406
* These reproduce what we would get without ARGP_NO_HELP
407
*/
408
{ .name = "help", .key = '?',
409
.doc = "Give this help list", .group = -1 },
410
{ .name = "usage", .key = -3,
411
.doc = "Give a short usage message", .group = -1 },
412
{ .name = "version", .key = 'V',
413
.doc = "Print program version", .group = -1 },
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 },
414
350
{ .name = NULL }
415
351
};
416
352
417
error_t parse_opt(int key, char *arg, struct argp_state *state){
418
errno = 0;
419
switch(key){
420
char *tmp;
421
intmax_t tmpmax;
422
case 'g': /* --global-options */
423
{
424
char *plugin_option;
425
while((plugin_option = strsep(&arg, ",")) != NULL){
426
if(not add_argument(getplugin(NULL), plugin_option)){
427
break;
428
}
429
}
430
}
431
break;
432
case 'G': /* --global-env */
433
add_environment(getplugin(NULL), arg, true);
434
break;
435
case 'o': /* --options-for */
436
{
437
char *option_list = strchr(arg, ':');
438
if(option_list == NULL){
439
argp_error(state, "No colon in \"%s\"", arg);
440
errno = EINVAL;
441
break;
442
}
443
*option_list = '\0';
444
option_list++;
445
if(arg[0] == '\0'){
446
argp_error(state, "Empty plugin name");
447
errno = EINVAL;
448
break;
449
}
450
char *option;
451
while((option = strsep(&option_list, ",")) != NULL){
452
if(not add_argument(getplugin(arg), option)){
453
break;
454
}
455
}
456
}
457
break;
458
case 'E': /* --env-for */
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
}
459
414
{
460
415
char *envdef = strchr(arg, ':');
461
416
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
417
break;
418
}
419
char *p_name = strndup(arg, (size_t) (envdef-arg));
420
if(p_name == NULL){
421
break;
422
}
467
423
envdef++;
468
if(arg[0] == '\0'){
469
argp_error(state, "Empty plugin name");
470
errno = EINVAL;
471
break;
472
}
473
add_environment(getplugin(arg), envdef, true);
474
}
475
break;
476
case 'd': /* --disable */
477
{
478
plugin *p = getplugin(arg);
479
if(p != NULL){
480
p->disabled = true;
481
}
482
}
483
break;
484
case 'e': /* --enable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = false;
489
}
490
}
491
break;
492
case 128: /* --plugin-dir */
493
free(plugindir);
494
plugindir = strdup(arg);
495
break;
496
case 129: /* --config-file */
497
/* This is already done by parse_opt_config_file() */
498
break;
499
case 130: /* --userid */
500
tmpmax = strtoimax(arg, &tmp, 10);
501
if(errno != 0 or tmp == arg or *tmp != '\0'
502
or tmpmax != (uid_t)tmpmax){
503
argp_error(state, "Bad user ID number: \"%s\", using %"
504
PRIdMAX, arg, (intmax_t)uid);
505
break;
506
}
507
uid = (uid_t)tmpmax;
508
break;
509
case 131: /* --groupid */
510
tmpmax = strtoimax(arg, &tmp, 10);
511
if(errno != 0 or tmp == arg or *tmp != '\0'
512
or tmpmax != (gid_t)tmpmax){
513
argp_error(state, "Bad group ID number: \"%s\", using %"
514
PRIdMAX, arg, (intmax_t)gid);
515
break;
516
}
517
gid = (gid_t)tmpmax;
518
break;
519
case 132: /* --debug */
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:
520
448
debug = true;
521
449
break;
522
/*
523
* These reproduce what we would get without ARGP_NO_HELP
524
*/
525
case '?': /* --help */
526
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
527
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
528
case -3: /* --usage */
529
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
530
argp_state_help(state, state->out_stream,
531
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
532
case 'V': /* --version */
533
fprintf(state->out_stream, "%s\n", argp_program_version);
534
exit(EXIT_SUCCESS);
535
break;
536
/*
537
* When adding more options before this line, remember to also add a
538
* "case" to the "parse_opt_config_file" function below.
539
*/
540
case ARGP_KEY_ARG:
541
/* Cryptsetup always passes an argument, which is an empty
542
string if "none" was specified in /etc/crypttab. So if
543
argument was empty, we ignore it silently. */
544
if(arg[0] == '\0'){
545
break;
546
}
547
default:
548
return ARGP_ERR_UNKNOWN;
549
}
550
return errno; /* Set to 0 at start */
551
}
552
553
/* This option parser is the same as parse_opt() above, except it
554
ignores everything but the --config-file option. */
555
error_t parse_opt_config_file(int key, char *arg,
556
__attribute__((unused))
557
struct argp_state *state){
558
errno = 0;
559
switch(key){
560
case 'g': /* --global-options */
561
case 'G': /* --global-env */
562
case 'o': /* --options-for */
563
case 'E': /* --env-for */
564
case 'd': /* --disable */
565
case 'e': /* --enable */
566
case 128: /* --plugin-dir */
567
break;
568
case 129: /* --config-file */
569
free(argfile);
570
argfile = strdup(arg);
571
break;
572
case 130: /* --userid */
573
case 131: /* --groupid */
574
case 132: /* --debug */
575
case '?': /* --help */
576
case -3: /* --usage */
577
case 'V': /* --version */
578
case ARGP_KEY_ARG:
579
break;
580
default:
581
return ARGP_ERR_UNKNOWN;
582
}
583
return errno;
584
}
585
586
struct argp argp = { .options = options,
587
.parser = parse_opt_config_file,
588
.args_doc = "",
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]",
589
465
.doc = "Mandos plugin runner -- Run plugins" };
590
466
591
/* Parse using parse_opt_config_file() in order to get the custom
592
config file location, if any. */
593
ret = argp_parse(&argp, argc, argv,
594
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
595
NULL, NULL);
596
switch(ret){
597
case 0:
598
break;
599
case ENOMEM:
600
default:
601
errno = ret;
602
perror("argp_parse");
603
exitstatus = EX_OSERR;
604
goto fallback;
605
case EINVAL:
606
exitstatus = EX_USAGE;
607
goto fallback;
608
}
609
610
/* Reset to the normal argument parser */
611
argp.parser = parse_opt;
612
613
/* Open the configfile if available */
614
if(argfile == NULL){
615
conffp = fopen(AFILE, "r");
616
} else {
617
conffp = fopen(argfile, "r");
618
}
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");
619
475
if(conffp != NULL){
620
476
char *org_line = NULL;
621
477
char *p, *arg, *new_arg, *line;
622
478
size_t size = 0;
479
ssize_t sret;
623
480
const char whitespace_delims[] = " \r\t\f\v\n";
624
481
const char comment_delim[] = "#";
625
626
custom_argc = 1;
627
custom_argv = malloc(sizeof(char*) * 2);
628
if(custom_argv == NULL){
629
perror("malloc");
630
exitstatus = EX_OSERR;
631
goto fallback;
632
}
633
custom_argv[0] = argv[0];
634
custom_argv[1] = NULL;
635
636
/* for each line in the config file, strip whitespace and ignore
637
commented text */
482
638
483
while(true){
639
484
sret = getline(&org_line, &size, conffp);
640
485
if(sret == -1){
641
486
break;
642
487
}
643
488
644
489
line = org_line;
645
490
arg = strsep(&line, comment_delim);
646
491
while((p = strsep(&arg, whitespace_delims)) != NULL){
648
493
continue;
649
494
}
650
495
new_arg = strdup(p);
651
if(new_arg == NULL){
652
perror("strdup");
653
exitstatus = EX_OSERR;
654
free(org_line);
655
goto fallback;
656
}
657
658
custom_argc += 1;
659
custom_argv = realloc(custom_argv, sizeof(char *)
660
* ((unsigned int) custom_argc + 1));
661
if(custom_argv == NULL){
662
perror("realloc");
663
exitstatus = EX_OSERR;
664
free(org_line);
665
goto fallback;
666
}
667
custom_argv[custom_argc-1] = new_arg;
668
custom_argv[custom_argc] = NULL;
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;
500
goto fallback;
501
}
669
502
}
670
503
}
671
do {
672
ret = fclose(conffp);
673
} while(ret == EOF and errno == EINTR);
674
if(ret == EOF){
675
perror("fclose");
676
exitstatus = EX_IOERR;
677
goto fallback;
678
}
679
504
free(org_line);
680
} else {
505
} else{
681
506
/* Check for harmful errors and go to fallback. Other errors might
682
507
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
509
perror("fopen");
685
exitstatus = EX_IOERR;
510
exitstatus = EXIT_FAILURE;
686
511
goto fallback;
687
512
}
688
513
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
514
691
515
if(custom_argv != NULL){
692
ret = argp_parse(&argp, custom_argc, custom_argv,
693
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
694
NULL, NULL);
695
switch(ret){
696
case 0:
697
break;
698
case ENOMEM:
699
default:
700
errno = ret;
701
perror("argp_parse");
702
exitstatus = EX_OSERR;
703
goto fallback;
704
case EINVAL:
705
exitstatus = EX_CONFIG;
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;
706
522
goto fallback;
707
523
}
708
524
}
709
525
710
/* Parse actual command line arguments, to let them override the
711
config file */
712
ret = argp_parse(&argp, argc, argv,
713
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
714
NULL, NULL);
715
switch(ret){
716
case 0:
717
break;
718
case ENOMEM:
719
default:
720
errno = ret;
721
perror("argp_parse");
722
exitstatus = EX_OSERR;
723
goto fallback;
724
case EINVAL:
725
exitstatus = EX_USAGE;
726
goto fallback;
727
}
728
729
526
if(debug){
730
527
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
528
fprintf(stderr, "Plugin: %s has %d arguments\n",
733
530
for(char **a = p->argv; *a != NULL; a++){
734
531
fprintf(stderr, "\tArg: %s\n", *a);
735
532
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
533
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
534
for(char **a = p->environ; *a != NULL; a++){
738
535
fprintf(stderr, "\t%s\n", *a);
739
536
}
740
537
}
741
538
}
742
539
743
/* Strip permissions down to nobody */
540
ret = setuid(uid);
541
if (ret == -1){
542
perror("setuid");
543
}
544
744
545
setgid(gid);
745
if(ret == -1){
546
if (ret == -1){
746
547
perror("setgid");
747
548
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
549
550
dir = opendir(plugindir);
551
if(dir == NULL){
552
perror("Could not open plugin dir");
553
exitstatus = EXIT_FAILURE;
554
goto fallback;
751
555
}
752
556
753
/* Open plugin directory with close_on_exec flag */
557
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
558
{
755
int dir_fd = -1;
756
if(plugindir == NULL){
757
dir_fd = open(PDIR, O_RDONLY |
758
#ifdef O_CLOEXEC
759
O_CLOEXEC
760
#else /* not O_CLOEXEC */
761
0
762
#endif /* not O_CLOEXEC */
763
);
764
} else {
765
dir_fd = open(plugindir, O_RDONLY |
766
#ifdef O_CLOEXEC
767
O_CLOEXEC
768
#else /* not O_CLOEXEC */
769
0
770
#endif /* not O_CLOEXEC */
771
);
772
}
773
if(dir_fd == -1){
774
perror("Could not open plugin dir");
775
exitstatus = EX_UNAVAILABLE;
776
goto fallback;
777
}
778
779
#ifndef O_CLOEXEC
780
/* Set the FD_CLOEXEC flag on the directory */
781
ret = set_cloexec_flag(dir_fd);
782
if(ret < 0){
783
perror("set_cloexec_flag");
784
TEMP_FAILURE_RETRY(close(dir_fd));
785
exitstatus = EX_OSERR;
786
goto fallback;
787
}
788
#endif /* O_CLOEXEC */
789
790
dir = fdopendir(dir_fd);
791
if(dir == NULL){
792
perror("Could not open plugin dir");
793
TEMP_FAILURE_RETRY(close(dir_fd));
794
exitstatus = EX_OSERR;
795
goto fallback;
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
}
796
567
}
797
568
}
798
569
799
570
FD_ZERO(&rfds_all);
800
571
801
/* Read and execute any executable in the plugin directory*/
802
572
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
573
dirst = readdir(dir);
806
574
807
/* All directory entries have been processed */
575
// All directory entries have been processed
808
576
if(dirst == NULL){
809
if(errno == EBADF){
577
if (errno == EBADF){
810
578
perror("readdir");
811
exitstatus = EX_IOERR;
579
exitstatus = EXIT_FAILURE;
812
580
goto fallback;
813
581
}
814
582
break;
816
584
817
585
d_name_len = strlen(dirst->d_name);
818
586
819
/* Ignore dotfiles, backup files and other junk */
587
// Ignore dotfiles, backup files and other junk
820
588
{
821
589
bool bad_name = false;
822
590
824
592
825
593
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
594
".dpkg-old",
827
".dpkg-bak",
828
595
".dpkg-divert", NULL };
829
596
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
597
size_t pre_len = strlen(*pre);
838
605
break;
839
606
}
840
607
}
608
841
609
if(bad_name){
842
610
continue;
843
611
}
612
844
613
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
614
size_t suf_len = strlen(*suf);
846
615
if((d_name_len >= suf_len)
859
628
continue;
860
629
}
861
630
}
862
631
863
632
char *filename;
864
if(plugindir == NULL){
865
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
866
dirst->d_name));
867
} else {
868
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
869
plugindir,
870
dirst->d_name));
871
}
633
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
872
634
if(ret < 0){
873
635
perror("asprintf");
874
636
continue;
875
637
}
876
638
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
639
ret = stat(filename, &st);
640
if (ret == -1){
879
641
perror("stat");
880
642
free(filename);
881
643
continue;
882
644
}
883
645
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
646
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
647
if(debug){
888
648
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
649
" with bad type or mode\n", filename);
891
651
free(filename);
892
652
continue;
893
653
}
894
895
plugin *p = getplugin(dirst->d_name);
654
plugin *p = getplugin(dirst->d_name, &plugin_list);
896
655
if(p == NULL){
897
656
perror("getplugin");
898
657
free(filename);
908
667
}
909
668
{
910
669
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
670
plugin *g = getplugin(NULL, &plugin_list);
912
671
if(g != NULL){
913
672
for(char **a = g->argv + 1; *a != NULL; a++){
914
673
if(not add_argument(p, *a)){
917
676
}
918
677
/* Add global environment variables */
919
678
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
679
if(not add_environment(p, *e)){
921
680
perror("add_environment");
922
681
}
923
682
}
928
687
process, too. */
929
688
if(p->environ[0] != NULL){
930
689
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
690
char *copy = strdup(*e);
691
if(copy == NULL){
692
perror("strdup");
693
continue;
694
}
695
if(not add_environment(p, copy)){
932
696
perror("add_environment");
933
697
}
934
698
}
935
699
}
936
700
937
701
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
702
ret = pipe(pipefd);
703
if (ret == -1){
940
704
perror("pipe");
941
exitstatus = EX_OSERR;
705
exitstatus = EXIT_FAILURE;
942
706
goto fallback;
943
707
}
944
/* Ask OS to automatic close the pipe on exec */
945
708
ret = set_cloexec_flag(pipefd[0]);
946
709
if(ret < 0){
947
710
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
711
exitstatus = EXIT_FAILURE;
949
712
goto fallback;
950
713
}
951
714
ret = set_cloexec_flag(pipefd[1]);
952
715
if(ret < 0){
953
716
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
717
exitstatus = EXIT_FAILURE;
955
718
goto fallback;
956
719
}
957
720
/* Block SIGCHLD until process is safely in process list */
958
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
959
&sigchld_action.sa_mask,
960
NULL));
721
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
722
if(ret < 0){
962
723
perror("sigprocmask");
963
exitstatus = EX_OSERR;
724
exitstatus = EXIT_FAILURE;
964
725
goto fallback;
965
726
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
727
// Starting a new process to be watched
728
pid_t pid = fork();
971
729
if(pid == -1){
972
730
perror("fork");
973
exitstatus = EX_OSERR;
731
exitstatus = EXIT_FAILURE;
974
732
goto fallback;
975
733
}
976
734
if(pid == 0){
978
736
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
737
if(ret < 0){
980
738
perror("sigaction");
981
_exit(EX_OSERR);
739
_exit(EXIT_FAILURE);
982
740
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
741
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
742
if(ret < 0){
985
743
perror("sigprocmask");
986
_exit(EX_OSERR);
744
_exit(EXIT_FAILURE);
987
745
}
988
746
989
747
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
748
if(ret == -1){
991
749
perror("dup2");
992
_exit(EX_OSERR);
750
_exit(EXIT_FAILURE);
993
751
}
994
752
995
753
if(dirfd(dir) < 0){
1000
758
if(p->environ[0] == NULL){
1001
759
if(execv(filename, p->argv) < 0){
1002
760
perror("execv");
1003
_exit(EX_OSERR);
761
_exit(EXIT_FAILURE);
1004
762
}
1005
763
} else {
1006
764
if(execve(filename, p->argv, p->environ) < 0){
1007
765
perror("execve");
1008
_exit(EX_OSERR);
766
_exit(EXIT_FAILURE);
1009
767
}
1010
768
}
1011
769
/* no return */
1012
770
}
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
771
/* parent process */
1016
772
free(filename);
1017
plugin *new_plugin = getplugin(dirst->d_name);
1018
if(new_plugin == NULL){
1019
perror("getplugin");
1020
ret = (int)(TEMP_FAILURE_RETRY
1021
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1022
NULL)));
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);
1023
778
if(ret < 0){
1024
perror("sigprocmask");
779
perror("sigprocmask");
1025
780
}
1026
exitstatus = EX_OSERR;
781
exitstatus = EXIT_FAILURE;
1027
782
goto fallback;
1028
783
}
1029
784
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1032
785
*new_process = (struct process){ .pid = pid,
786
.fd = pipefd[0],
787
.next = process_list };
788
// List handling
789
process_list = new_process;
1033
790
/* Unblock SIGCHLD so signal handler can be run if this process
1034
791
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
792
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
793
if(ret < 0){
1039
794
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
795
exitstatus = EXIT_FAILURE;
1041
796
goto fallback;
1042
797
}
1043
798
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
799
FD_SET(new_process->fd, &rfds_all);
1046
800
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
801
if (maxfd < new_process->fd){
802
maxfd = new_process->fd;
1049
803
}
804
1050
805
}
1051
806
1052
TEMP_FAILURE_RETRY(closedir(dir));
807
free_plugin_list(plugin_list);
808
plugin_list = NULL;
809
810
closedir(dir);
1053
811
dir = NULL;
1054
free_plugin(getplugin(NULL));
1055
1056
for(plugin *p = plugin_list; p != NULL; p = p->next){
1057
if(p->pid != 0){
1058
break;
1059
}
1060
if(p->next == NULL){
1061
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1062
" directory?\n");
1063
free_plugin_list();
1064
}
812
813
if (process_list == NULL){
814
fprintf(stderr, "No plugin processes started. Incorrect plugin"
815
" directory?\n");
816
process_list = NULL;
1065
817
}
1066
1067
/* Main loop while running plugins exist */
1068
while(plugin_list){
818
while(process_list){
1069
819
fd_set rfds = rfds_all;
1070
820
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
821
if (select_ret == -1){
1072
822
perror("select");
1073
exitstatus = EX_OSERR;
823
exitstatus = EXIT_FAILURE;
1074
824
goto fallback;
1075
825
}
1076
826
/* OK, now either a process completed, or something can be read
1077
827
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
828
for(process *proc = process_list; proc ; proc = proc->next){
1079
829
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
830
if(proc->eof and proc->completed){
1081
831
/* Only accept the plugin output if it exited cleanly */
1082
832
if(not WIFEXITED(proc->status)
1083
833
or WEXITSTATUS(proc->status) != 0){
1084
834
/* Bad exit by plugin */
1085
1086
835
if(debug){
1087
836
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
837
fprintf(stderr, "Plugin %u exited with status %d\n",
838
(unsigned int) (proc->pid),
1091
839
WEXITSTATUS(proc->status));
1092
} else if(WIFSIGNALED(proc->status)){
1093
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1094
" signal %d: %s\n", proc->name,
1095
(intmax_t) (proc->pid),
1096
WTERMSIG(proc->status),
1097
strsignal(WTERMSIG(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));
1098
844
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
845
fprintf(stderr, "Plugin %d dumped core\n",
846
(unsigned int) (proc->pid));
1101
847
}
1102
848
}
1103
1104
849
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
850
FD_CLR(proc->fd, &rfds_all);
1108
851
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
853
if(ret < 0){
1114
854
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
855
exitstatus = EXIT_FAILURE;
1116
856
goto fallback;
1117
857
}
1118
1119
plugin *next_plugin = proc->next;
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
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
}
1123
871
/* We are done modifying process list, so unblock signal */
1124
ret = (int)(TEMP_FAILURE_RETRY
1125
(sigprocmask(SIG_UNBLOCK,
1126
&sigchld_action.sa_mask, NULL)));
872
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
873
NULL);
1127
874
if(ret < 0){
1128
875
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
continue;
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;
1138
883
}
1139
1140
884
/* This process exited nicely, so print its buffer */
1141
885
1142
886
bool bret = print_out_password(proc->buffer,
1143
887
proc->buffer_length);
1144
888
if(not bret){
1145
889
perror("print_out_password");
1146
exitstatus = EX_IOERR;
890
exitstatus = EXIT_FAILURE;
1147
891
}
1148
892
goto fallback;
1149
893
}
1150
1151
894
/* This process has not completed. Does it have any output? */
1152
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1153
warning from
1154
-Wconversion */
895
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
896
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
897
continue;
1158
898
}
1159
899
/* Before reading, make the process' data buffer large enough */
1160
900
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
901
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
902
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
903
if (proc->buffer == NULL){
1164
904
perror("malloc");
1165
exitstatus = EX_OSERR;
905
exitstatus = EXIT_FAILURE;
1166
906
goto fallback;
1167
907
}
1168
908
proc->buffer_size += BUFFER_SIZE;
1169
909
}
1170
910
/* Read from the process */
1171
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1172
proc->buffer
1173
+ proc->buffer_length,
1174
BUFFER_SIZE));
1175
if(sret < 0){
911
ret = read(proc->fd, proc->buffer + proc->buffer_length,
912
BUFFER_SIZE);
913
if(ret < 0){
1176
914
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
915
continue;
1179
916
}
1180
if(sret == 0){
917
if(ret == 0){
1181
918
/* got EOF */
1182
919
proc->eof = true;
1183
920
} else {
1184
proc->buffer_length += (size_t) sret;
921
proc->buffer_length += (size_t) ret;
1185
922
}
1186
923
}
1187
924
}
1188
1189
925
926
1190
927
fallback:
1191
928
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
929
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1194
930
/* Fallback if all plugins failed, none are found or an error
1195
931
occured */
1196
932
bool bret;
1197
933
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
934
char *passwordbuffer = getpass("Password: ");
1199
size_t len = strlen(passwordbuffer);
1200
/* Strip trailing newline */
1201
if(len > 0 and passwordbuffer[len-1] == '\n'){
1202
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1203
len--;
1204
}
1205
bret = print_out_password(passwordbuffer, len);
935
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
936
if(not bret){
1207
937
perror("print_out_password");
1208
exitstatus = EX_IOERR;
938
exitstatus = EXIT_FAILURE;
1209
939
}
1210
940
}
1211
941
1213
943
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
944
if(ret == -1){
1215
945
perror("sigaction");
1216
exitstatus = EX_OSERR;
946
exitstatus = EXIT_FAILURE;
1217
947
}
1218
948
1219
949
if(custom_argv != NULL){
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
950
for(char **arg = custom_argv; *arg != NULL; arg++){
1221
951
free(*arg);
1222
952
}
1223
953
free(custom_argv);
1224
954
}
955
free_plugin_list(plugin_list);
1225
956
1226
957
if(dir != NULL){
1227
958
closedir(dir);
1228
959
}
1229
960
1230
/* Kill the processes */
1231
for(plugin *p = plugin_list; p != NULL; p = p->next){
1232
if(p->pid != 0){
1233
close(p->fd);
1234
ret = kill(p->pid, SIGTERM);
1235
if(ret == -1 and errno != ESRCH){
1236
/* Set-uid proccesses might not get closed */
1237
perror("kill");
1238
}
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");
1239
969
}
970
free(process_list->buffer);
971
free(process_list);
1240
972
}
1241
973
1242
974
/* Wait for any remaining child processes to terminate */
1243
do {
975
do{
1244
976
ret = wait(NULL);
1245
977
} while(ret >= 0);
1246
978
if(errno != ECHILD){
1247
979
perror("wait");
1248
980
}
1249
981
1250
free_plugin_list();
1251
1252
free(plugindir);
1253
free(argfile);
1254
1255
982
return exitstatus;
1256
983
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0