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- Committer: Teddy Hogeborn
- Date: 2008-08-23 07:17:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080823071728-wo1k2mtbje5910np
* Makefile (MANPOST): Bug fix: corrected patterns.
* mandos-options.xml: Bug fix: also change root node tag name in
DOCTYPE declaration.
(interface, address): Improved wording.
* overview.xml: Changed "host computer" to "computer".
* mandos-options.xml: Bug fix: also change root node tag name in
DOCTYPE declaration.
(interface, address): Improved wording.
* overview.xml: Changed "host computer" to "computer".
- 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(), strcmp(), strncmp() */
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,
61
58
argp_parse(), ARGP_ERR_UNKNOWN,
62
ARGP_KEY_END, ARGP_KEY_ARG,
63
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
64
60
#include <signal.h> /* struct sigaction, sigemptyset(),
65
61
sigaddset(), sigaction(),
66
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
63
SIG_UNBLOCK, kill() */
69
64
#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
65
74
66
#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;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
80
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
82
86
typedef struct plugin{
83
87
char *name; /* can be NULL or any plugin name */
84
88
char **argv;
86
90
char **environ;
87
91
int envc;
88
92
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
93
struct plugin *next;
100
94
} plugin;
101
95
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))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
111
100
return p;
112
101
}
113
102
}
114
103
/* 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){
120
return NULL;
121
}
122
char *copy_name = NULL;
123
if(name != NULL){
124
do {
125
copy_name = strdup(name);
126
} while(copy_name == NULL and errno == EINTR);
127
if(copy_name == NULL){
128
int e = errno;
129
free(new_plugin);
130
errno = e;
131
return NULL;
132
}
133
}
134
135
*new_plugin = (plugin){ .name = copy_name,
136
.argc = 1,
137
.disabled = false,
138
.next = plugin_list };
139
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;
145
free(copy_name);
104
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
106
return NULL;
107
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
111
}
112
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
118
119
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
146
121
free(new_plugin);
147
errno = e;
148
122
return NULL;
149
123
}
150
124
new_plugin->argv[0] = copy_name;
151
125
new_plugin->argv[1] = NULL;
152
153
do {
154
new_plugin->environ = malloc(sizeof(char *));
155
} while(new_plugin->environ == NULL and errno == EINTR);
126
127
new_plugin->environ = malloc(sizeof(char *));
156
128
if(new_plugin->environ == NULL){
157
int e = errno;
158
free(copy_name);
159
129
free(new_plugin->argv);
160
130
free(new_plugin);
161
errno = e;
162
131
return NULL;
163
132
}
164
133
new_plugin->environ[0] = NULL;
165
166
134
/* Append the new plugin to the list */
167
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
168
136
return new_plugin;
169
137
}
170
138
172
140
static bool add_to_char_array(const char *new, char ***array,
173
141
int *len){
174
142
/* 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);
143
*array = realloc(*array, sizeof(char *)
144
* (size_t) ((*len) + 2));
179
145
/* Malloc check */
180
146
if(*array == NULL){
181
147
return false;
182
148
}
183
149
/* Make a copy of the new string */
184
char *copy;
185
do {
186
copy = strdup(new);
187
} while(copy == NULL and errno == EINTR);
150
char *copy = strdup(new);
188
151
if(copy == NULL){
189
152
return false;
190
153
}
205
168
}
206
169
207
170
/* Add to a plugin's environment */
208
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
209
172
if(p == NULL){
210
173
return false;
211
174
}
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
175
return add_to_char_array(def, &(p->environ), &(p->envc));
233
176
}
234
177
178
235
179
/*
236
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
237
181
* Descriptor Flags".
238
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
239
183
*/
240
static int set_cloexec_flag(int fd){
241
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
184
static int set_cloexec_flag(int fd)
185
{
186
int ret = fcntl(fd, F_GETFD, 0);
242
187
/* If reading the flags failed, return error indication now. */
243
188
if(ret < 0){
244
189
return ret;
245
190
}
246
191
/* Store modified flag word in the descriptor. */
247
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
248
ret | FD_CLOEXEC));
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
193
}
250
194
195
process *process_list = NULL;
251
196
252
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
253
198
status. */
254
static void handle_sigchld(__attribute__((unused)) int sig){
255
int old_errno = errno;
256
while(true){
257
plugin *proc = plugin_list;
258
int status;
259
pid_t pid = waitpid(-1, &status, WNOHANG);
260
if(pid == 0){
261
/* Only still running child processes */
262
break;
263
}
264
if(pid == -1){
265
if(errno == ECHILD){
266
/* No child processes */
267
break;
268
}
269
perror("waitpid");
270
}
271
272
/* A child exited, find it in process_list */
273
while(proc != NULL and proc->pid != pid){
274
proc = proc->next;
275
}
276
if(proc == NULL){
277
/* Process not found in process list */
278
continue;
279
}
280
proc->status = status;
281
proc->completed = 1;
282
}
283
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
284
216
}
285
217
286
/* Prints out a password to stdout */
287
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
288
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
289
223
for(size_t written = 0; written < length; written += (size_t)ret){
290
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
291
225
length - written));
296
230
return true;
297
231
}
298
232
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
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
323
239
}
324
}
325
326
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
327
252
}
328
253
329
static void free_plugin_list(void){
330
while(plugin_list != NULL){
331
free_plugin(plugin_list);
332
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
333
268
}
334
269
335
270
int main(int argc, char *argv[]){
336
char *plugindir = NULL;
337
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
338
273
FILE *conffp;
339
274
size_t d_name_len;
340
275
DIR *dir = NULL;
342
277
struct stat st;
343
278
fd_set rfds_all;
344
279
int ret, maxfd = 0;
345
ssize_t sret;
346
280
uid_t uid = 65534;
347
281
gid_t gid = 65534;
348
282
bool debug = false;
358
292
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
359
293
if(ret == -1){
360
294
perror("sigaddset");
361
exitstatus = EX_OSERR;
295
exitstatus = EXIT_FAILURE;
362
296
goto fallback;
363
297
}
364
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
365
299
if(ret == -1){
366
300
perror("sigaction");
367
exitstatus = EX_OSERR;
301
exitstatus = EXIT_FAILURE;
368
302
goto fallback;
369
303
}
370
304
373
307
{ .name = "global-options", .key = 'g',
374
308
.arg = "OPTION[,OPTION[,...]]",
375
309
.doc = "Options passed to all plugins" },
376
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
377
311
.arg = "VAR=value",
378
312
.doc = "Environment variable passed to all plugins" },
379
313
{ .name = "options-for", .key = 'o',
380
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
381
315
.doc = "Options passed only to specified plugin" },
382
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
383
317
.arg = "PLUGIN:ENV=value",
384
318
.doc = "Environment variable passed to specified plugin" },
385
319
{ .name = "disable", .key = 'd',
386
320
.arg = "PLUGIN",
387
321
.doc = "Disable a specific plugin", .group = 1 },
388
{ .name = "enable", .key = 'e',
389
.arg = "PLUGIN",
390
.doc = "Enable a specific plugin", .group = 1 },
391
322
{ .name = "plugin-dir", .key = 128,
392
323
.arg = "DIRECTORY",
393
324
.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 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
414
333
{ .name = NULL }
415
334
};
416
335
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 */
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
346
continue;
347
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
349
perror("add_argument");
350
return ARGP_ERR_UNKNOWN;
351
}
352
}
353
}
354
break;
355
case 'e':
356
if(arg == NULL){
357
break;
358
}
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
367
}
368
break;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
389
}
390
}
391
}
392
break;
393
case 'f':
394
if(arg == NULL){
395
break;
396
}
459
397
{
460
398
char *envdef = strchr(arg, ':');
461
399
if(envdef == NULL){
462
argp_error(state, "No colon in \"%s\"", arg);
463
errno = EINVAL;
464
break;
465
}
466
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
467
406
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 */
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
408
perror("add_environment");
409
}
410
}
411
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
415
if(p == NULL){
416
return ARGP_ERR_UNKNOWN;
417
}
418
p->disabled = true;
419
}
420
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
520
431
debug = true;
521
432
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 = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
589
448
.doc = "Mandos plugin runner -- Run plugins" };
590
449
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
}
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
452
fprintf(stderr, "Unknown error while parsing arguments\n");
453
exitstatus = EXIT_FAILURE;
454
goto fallback;
455
}
456
457
conffp = fopen(argfile, "r");
619
458
if(conffp != NULL){
620
459
char *org_line = NULL;
621
460
char *p, *arg, *new_arg, *line;
622
461
size_t size = 0;
462
ssize_t sret;
623
463
const char whitespace_delims[] = " \r\t\f\v\n";
624
464
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 */
465
638
466
while(true){
639
467
sret = getline(&org_line, &size, conffp);
640
468
if(sret == -1){
641
469
break;
642
470
}
643
471
644
472
line = org_line;
645
473
arg = strsep(&line, comment_delim);
646
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
648
476
continue;
649
477
}
650
478
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;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
669
485
}
670
486
}
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
487
free(org_line);
680
} else {
488
} else{
681
489
/* Check for harmful errors and go to fallback. Other errors might
682
490
not affect opening plugins */
683
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
684
492
perror("fopen");
685
exitstatus = EX_OSERR;
493
exitstatus = EXIT_FAILURE;
686
494
goto fallback;
687
495
}
688
496
}
689
/* If there were any arguments from the configuration file, pass
690
them to parser as command line arguments */
497
691
498
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;
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
502
fprintf(stderr, "Unknown error while parsing arguments\n");
503
exitstatus = EXIT_FAILURE;
706
504
goto fallback;
707
505
}
708
506
}
709
507
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
508
if(debug){
730
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
731
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
733
512
for(char **a = p->argv; *a != NULL; a++){
734
513
fprintf(stderr, "\tArg: %s\n", *a);
735
514
}
736
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
737
516
for(char **a = p->environ; *a != NULL; a++){
738
517
fprintf(stderr, "\t%s\n", *a);
739
518
}
740
519
}
741
520
}
742
521
743
/* Strip permissions down to nobody */
522
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
744
527
setgid(gid);
745
if(ret == -1){
528
if (ret == -1){
746
529
perror("setgid");
747
530
}
748
ret = setuid(uid);
749
if(ret == -1){
750
perror("setuid");
531
532
dir = opendir(plugindir);
533
if(dir == NULL){
534
perror("Could not open plugin dir");
535
exitstatus = EXIT_FAILURE;
536
goto fallback;
751
537
}
752
538
753
/* Open plugin directory with close_on_exec flag */
539
/* Set the FD_CLOEXEC flag on the directory, if possible */
754
540
{
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;
541
int dir_fd = dirfd(dir);
542
if(dir_fd >= 0){
543
ret = set_cloexec_flag(dir_fd);
544
if(ret < 0){
545
perror("set_cloexec_flag");
546
exitstatus = EXIT_FAILURE;
547
goto fallback;
548
}
796
549
}
797
550
}
798
551
799
552
FD_ZERO(&rfds_all);
800
553
801
/* Read and execute any executable in the plugin directory*/
802
554
while(true){
803
do {
804
dirst = readdir(dir);
805
} while(dirst == NULL and errno == EINTR);
555
dirst = readdir(dir);
806
556
807
/* All directory entries have been processed */
557
// All directory entries have been processed
808
558
if(dirst == NULL){
809
if(errno == EBADF){
559
if (errno == EBADF){
810
560
perror("readdir");
811
exitstatus = EX_IOERR;
561
exitstatus = EXIT_FAILURE;
812
562
goto fallback;
813
563
}
814
564
break;
816
566
817
567
d_name_len = strlen(dirst->d_name);
818
568
819
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
820
570
{
821
571
bool bad_name = false;
822
572
824
574
825
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
826
576
".dpkg-old",
827
".dpkg-bak",
828
577
".dpkg-divert", NULL };
829
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
830
579
size_t pre_len = strlen(*pre);
838
587
break;
839
588
}
840
589
}
590
841
591
if(bad_name){
842
592
continue;
843
593
}
594
844
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
845
596
size_t suf_len = strlen(*suf);
846
597
if((d_name_len >= suf_len)
847
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
598
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
848
599
== 0)){
849
600
if(debug){
850
601
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
859
610
continue;
860
611
}
861
612
}
862
613
863
614
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
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
872
616
if(ret < 0){
873
617
perror("asprintf");
874
618
continue;
875
619
}
876
620
877
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
878
if(ret == -1){
621
ret = stat(filename, &st);
622
if (ret == -1){
879
623
perror("stat");
880
624
free(filename);
881
625
continue;
882
626
}
883
627
884
/* Ignore non-executable files */
885
if(not S_ISREG(st.st_mode)
886
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
887
629
if(debug){
888
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
889
631
" with bad type or mode\n", filename);
891
633
free(filename);
892
634
continue;
893
635
}
894
895
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
896
637
if(p == NULL){
897
638
perror("getplugin");
898
639
free(filename);
908
649
}
909
650
{
910
651
/* Add global arguments to argument list for this plugin */
911
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
912
653
if(g != NULL){
913
654
for(char **a = g->argv + 1; *a != NULL; a++){
914
655
if(not add_argument(p, *a)){
917
658
}
918
659
/* Add global environment variables */
919
660
for(char **e = g->environ; *e != NULL; e++){
920
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
921
662
perror("add_environment");
922
663
}
923
664
}
928
669
process, too. */
929
670
if(p->environ[0] != NULL){
930
671
for(char **e = environ; *e != NULL; e++){
931
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
932
678
perror("add_environment");
933
679
}
934
680
}
935
681
}
936
682
937
int pipefd[2];
938
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
939
if(ret == -1){
683
int pipefd[2];
684
ret = pipe(pipefd);
685
if (ret == -1){
940
686
perror("pipe");
941
exitstatus = EX_OSERR;
687
exitstatus = EXIT_FAILURE;
942
688
goto fallback;
943
689
}
944
/* Ask OS to automatic close the pipe on exec */
945
690
ret = set_cloexec_flag(pipefd[0]);
946
691
if(ret < 0){
947
692
perror("set_cloexec_flag");
948
exitstatus = EX_OSERR;
693
exitstatus = EXIT_FAILURE;
949
694
goto fallback;
950
695
}
951
696
ret = set_cloexec_flag(pipefd[1]);
952
697
if(ret < 0){
953
698
perror("set_cloexec_flag");
954
exitstatus = EX_OSERR;
699
exitstatus = EXIT_FAILURE;
955
700
goto fallback;
956
701
}
957
702
/* 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));
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
961
704
if(ret < 0){
962
705
perror("sigprocmask");
963
exitstatus = EX_OSERR;
706
exitstatus = EXIT_FAILURE;
964
707
goto fallback;
965
708
}
966
/* Starting a new process to be watched */
967
pid_t pid;
968
do {
969
pid = fork();
970
} while(pid == -1 and errno == EINTR);
709
// Starting a new process to be watched
710
pid_t pid = fork();
971
711
if(pid == -1){
972
712
perror("fork");
973
exitstatus = EX_OSERR;
713
exitstatus = EXIT_FAILURE;
974
714
goto fallback;
975
715
}
976
716
if(pid == 0){
978
718
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
979
719
if(ret < 0){
980
720
perror("sigaction");
981
_exit(EX_OSERR);
721
_exit(EXIT_FAILURE);
982
722
}
983
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
984
724
if(ret < 0){
985
725
perror("sigprocmask");
986
_exit(EX_OSERR);
726
_exit(EXIT_FAILURE);
987
727
}
988
728
989
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
990
730
if(ret == -1){
991
731
perror("dup2");
992
_exit(EX_OSERR);
732
_exit(EXIT_FAILURE);
993
733
}
994
734
995
735
if(dirfd(dir) < 0){
1000
740
if(p->environ[0] == NULL){
1001
741
if(execv(filename, p->argv) < 0){
1002
742
perror("execv");
1003
_exit(EX_OSERR);
743
_exit(EXIT_FAILURE);
1004
744
}
1005
745
} else {
1006
746
if(execve(filename, p->argv, p->environ) < 0){
1007
747
perror("execve");
1008
_exit(EX_OSERR);
748
_exit(EXIT_FAILURE);
1009
749
}
1010
750
}
1011
751
/* no return */
1012
752
}
1013
/* Parent process */
1014
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1015
pipe */
753
/* parent process */
1016
754
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)));
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1023
760
if(ret < 0){
1024
perror("sigprocmask");
761
perror("sigprocmask");
1025
762
}
1026
exitstatus = EX_OSERR;
763
exitstatus = EXIT_FAILURE;
1027
764
goto fallback;
1028
765
}
1029
766
1030
new_plugin->pid = pid;
1031
new_plugin->fd = pipefd[0];
1032
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
1033
772
/* Unblock SIGCHLD so signal handler can be run if this process
1034
773
has already completed */
1035
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1036
&sigchld_action.sa_mask,
1037
NULL));
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1038
775
if(ret < 0){
1039
776
perror("sigprocmask");
1040
exitstatus = EX_OSERR;
777
exitstatus = EXIT_FAILURE;
1041
778
goto fallback;
1042
779
}
1043
780
1044
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1045
-Wconversion */
781
FD_SET(new_process->fd, &rfds_all);
1046
782
1047
if(maxfd < new_plugin->fd){
1048
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
1049
785
}
786
1050
787
}
1051
788
1052
TEMP_FAILURE_RETRY(closedir(dir));
789
free_plugin_list(plugin_list);
790
791
closedir(dir);
1053
792
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
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
1065
798
}
1066
1067
/* Main loop while running plugins exist */
1068
while(plugin_list){
799
while(process_list){
1069
800
fd_set rfds = rfds_all;
1070
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1071
if(select_ret == -1 and errno != EINTR){
802
if (select_ret == -1){
1072
803
perror("select");
1073
exitstatus = EX_OSERR;
804
exitstatus = EXIT_FAILURE;
1074
805
goto fallback;
1075
806
}
1076
807
/* OK, now either a process completed, or something can be read
1077
808
from one of them */
1078
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
1079
810
/* Is this process completely done? */
1080
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
1081
812
/* Only accept the plugin output if it exited cleanly */
1082
813
if(not WIFEXITED(proc->status)
1083
814
or WEXITSTATUS(proc->status) != 0){
1084
815
/* Bad exit by plugin */
1085
1086
816
if(debug){
1087
817
if(WIFEXITED(proc->status)){
1088
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1089
" status %d\n", proc->name,
1090
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
1091
820
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)));
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
824
WTERMSIG(proc->status));
1098
825
} else if(WCOREDUMP(proc->status)){
1099
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1100
" core\n", proc->name, (intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
1101
828
}
1102
829
}
1103
1104
830
/* Remove the plugin */
1105
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1106
-Wconversion */
1107
831
FD_CLR(proc->fd, &rfds_all);
1108
832
/* Block signal while modifying process_list */
1109
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1110
(SIG_BLOCK,
1111
&sigchld_action.sa_mask,
1112
NULL));
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1113
834
if(ret < 0){
1114
835
perror("sigprocmask");
1115
exitstatus = EX_OSERR;
836
exitstatus = EXIT_FAILURE;
1116
837
goto fallback;
1117
838
}
1118
1119
plugin *next_plugin = proc->next;
1120
free_plugin(proc);
1121
proc = next_plugin;
1122
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1123
852
/* 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)));
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1127
855
if(ret < 0){
1128
856
perror("sigprocmask");
1129
exitstatus = EX_OSERR;
1130
goto fallback;
1131
}
1132
1133
if(plugin_list == NULL){
1134
break;
1135
}
1136
1137
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1138
864
}
1139
1140
865
/* This process exited nicely, so print its buffer */
1141
1142
bool bret = print_out_password(proc->buffer,
1143
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1144
868
if(not bret){
1145
869
perror("print_out_password");
1146
exitstatus = EX_IOERR;
870
exitstatus = EXIT_FAILURE;
1147
871
}
1148
872
goto fallback;
1149
873
}
1150
1151
874
/* 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 */
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1155
876
/* This process had nothing to say at this time */
1156
proc = proc->next;
1157
877
continue;
1158
878
}
1159
879
/* Before reading, make the process' data buffer large enough */
1160
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1161
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1162
882
+ (size_t) BUFFER_SIZE);
1163
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1164
884
perror("malloc");
1165
exitstatus = EX_OSERR;
885
exitstatus = EXIT_FAILURE;
1166
886
goto fallback;
1167
887
}
1168
888
proc->buffer_size += BUFFER_SIZE;
1169
889
}
1170
890
/* 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){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1176
894
/* Read error from this process; ignore the error */
1177
proc = proc->next;
1178
895
continue;
1179
896
}
1180
if(sret == 0){
897
if(ret == 0){
1181
898
/* got EOF */
1182
899
proc->eof = true;
1183
900
} else {
1184
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1185
902
}
1186
903
}
1187
904
}
1188
1189
905
906
1190
907
fallback:
1191
908
1192
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1193
and exitstatus != EX_OK)){
1194
/* Fallback if all plugins failed, none are found or an error
1195
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1196
911
bool bret;
1197
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1198
913
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);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1206
915
if(not bret){
1207
916
perror("print_out_password");
1208
exitstatus = EX_IOERR;
917
exitstatus = EXIT_FAILURE;
1209
918
}
1210
919
}
1211
920
1213
922
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1214
923
if(ret == -1){
1215
924
perror("sigaction");
1216
exitstatus = EX_OSERR;
925
exitstatus = EXIT_FAILURE;
1217
926
}
1218
927
1219
928
if(custom_argv != NULL){
1220
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1221
930
free(*arg);
1222
931
}
1223
932
free(custom_argv);
1224
933
}
934
free_plugin_list(plugin_list);
1225
935
1226
936
if(dir != NULL){
1227
937
closedir(dir);
1228
938
}
1229
939
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
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1239
948
}
949
free(process_list->buffer);
950
free(process_list);
1240
951
}
1241
952
1242
953
/* Wait for any remaining child processes to terminate */
1243
do {
954
do{
1244
955
ret = wait(NULL);
1245
956
} while(ret >= 0);
1246
957
if(errno != ECHILD){
1247
958
perror("wait");
1248
959
}
1249
960
1250
free_plugin_list();
1251
1252
free(plugindir);
1253
free(argfile);
1254
1255
961
return exitstatus;
1256
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0