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- Committer: Teddy Hogeborn
- Date: 2008-08-29 07:14:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080829071439-feg1el14hx1abvqg
* mandos-keygen.xml (EXAMPLE): Replaced all occurrences of command
name with "&COMMANDNAME;".
* plugin-runner.xml (EXAMPLES): Renamed to "EXAMPLE". - '' -
name with "&COMMANDNAME;".
* plugin-runner.xml (EXAMPLES): Renamed to "EXAMPLE". - '' -
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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> /* 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,
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
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
75
66
76
67
#define BUFFER_SIZE 256
77
68
78
69
#define PDIR "/lib/mandos/plugins.d"
79
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
80
71
81
const char *argp_program_version = "plugin-runner " VERSION;
72
const char *argp_program_version = "plugin-runner 1.0";
82
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
83
74
75
struct process;
76
77
typedef struct process{
78
pid_t pid;
79
int fd;
80
char *buffer;
81
size_t buffer_size;
82
size_t buffer_length;
83
bool eof;
84
volatile bool completed;
85
volatile int status;
86
struct process *next;
87
} process;
88
84
89
typedef struct plugin{
85
90
char *name; /* can be NULL or any plugin name */
86
91
char **argv;
88
93
char **environ;
89
94
int envc;
90
95
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;
101
96
struct plugin *next;
102
97
} plugin;
103
98
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
static plugin *getplugin(char *name){
109
/* Check for existing plugin with that name */
110
for(plugin *p = plugin_list; p != NULL; p = p->next){
111
if((p->name == name)
112
or (p->name and name and (strcmp(p->name, name) == 0))){
99
static plugin *getplugin(char *name, plugin **plugin_list){
100
for (plugin *p = *plugin_list; p != NULL; p = p->next){
101
if ((p->name == name)
102
or (p->name and name and (strcmp(p->name, name) == 0))){
113
103
return p;
114
104
}
115
105
}
116
106
/* Create a new plugin */
117
plugin *new_plugin = NULL;
118
do {
119
new_plugin = malloc(sizeof(plugin));
120
} while(new_plugin == NULL and errno == EINTR);
121
if(new_plugin == NULL){
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
122
109
return NULL;
123
110
}
124
111
char *copy_name = NULL;
125
112
if(name != NULL){
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
113
copy_name = strdup(name);
129
114
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
133
115
return NULL;
134
116
}
135
117
}
136
118
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
141
124
142
do {
143
new_plugin->argv = malloc(sizeof(char *) * 2);
144
} while(new_plugin->argv == NULL and errno == EINTR);
145
if(new_plugin->argv == NULL){
146
int e = errno;
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
147
127
free(copy_name);
148
128
free(new_plugin);
149
errno = e;
150
129
return NULL;
151
130
}
152
131
new_plugin->argv[0] = copy_name;
153
132
new_plugin->argv[1] = NULL;
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
133
134
new_plugin->environ = malloc(sizeof(char *));
158
135
if(new_plugin->environ == NULL){
159
int e = errno;
160
136
free(copy_name);
161
137
free(new_plugin->argv);
162
138
free(new_plugin);
163
errno = e;
164
139
return NULL;
165
140
}
166
141
new_plugin->environ[0] = NULL;
167
168
142
/* Append the new plugin to the list */
169
plugin_list = new_plugin;
143
*plugin_list = new_plugin;
170
144
return new_plugin;
171
145
}
172
146
174
148
static bool add_to_char_array(const char *new, char ***array,
175
149
int *len){
176
150
/* Resize the pointed-to array to hold one more pointer */
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
181
153
/* Malloc check */
182
154
if(*array == NULL){
183
155
return false;
184
156
}
185
157
/* Make a copy of the new string */
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
158
char *copy = strdup(new);
190
159
if(copy == NULL){
191
160
return false;
192
161
}
207
176
}
208
177
209
178
/* Add to a plugin's environment */
210
static bool add_environment(plugin *p, const char *def, bool replace){
179
static bool add_environment(plugin *p, const char *def){
211
180
if(p == NULL){
212
181
return false;
213
182
}
214
/* namelen = length of name of environment variable */
215
size_t namelen = (size_t)(strchrnul(def, '=') - def);
216
/* Search for this environment variable */
217
for(char **e = p->environ; *e != NULL; e++){
218
if(strncmp(*e, def, namelen + 1) == 0){
219
/* It already exists */
220
if(replace){
221
char *new;
222
do {
223
new = realloc(*e, strlen(def) + 1);
224
} while(new == NULL and errno == EINTR);
225
if(new == NULL){
226
return false;
227
}
228
*e = new;
229
strcpy(*e, def);
230
}
231
return true;
232
}
233
}
234
183
return add_to_char_array(def, &(p->environ), &(p->envc));
235
184
}
236
185
186
237
187
/*
238
188
* Based on the example in the GNU LibC manual chapter 13.13 "File
239
189
* Descriptor Flags".
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
241
191
*/
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
244
195
/* If reading the flags failed, return error indication now. */
245
196
if(ret < 0){
246
197
return ret;
247
198
}
248
199
/* Store modified flag word in the descriptor. */
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
251
201
}
252
202
203
process *process_list = NULL;
253
204
254
205
/* Mark processes as completed when they exit, and save their exit
255
206
status. */
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
207
void handle_sigchld(__attribute__((unused)) int sig){
258
208
while(true){
259
plugin *proc = plugin_list;
209
process *proc = process_list;
260
210
int status;
261
211
pid_t pid = waitpid(-1, &status, WNOHANG);
262
212
if(pid == 0){
264
214
break;
265
215
}
266
216
if(pid == -1){
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
217
if (errno != ECHILD){
218
perror("waitpid");
270
219
}
271
error(0, errno, "waitpid");
220
/* No child processes */
221
break;
272
222
}
273
223
274
224
/* A child exited, find it in process_list */
275
225
while(proc != NULL and proc->pid != pid){
276
226
proc = proc->next;
280
230
continue;
281
231
}
282
232
proc->status = status;
283
proc->completed = 1;
233
proc->completed = true;
284
234
}
285
errno = old_errno;
286
235
}
287
236
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
237
bool print_out_password(const char *buffer, size_t length){
290
238
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
291
242
for(size_t written = 0; written < length; written += (size_t)ret){
292
243
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
293
244
length - written));
298
249
return true;
299
250
}
300
251
301
/* Removes and free a plugin from the plugin list */
302
static void free_plugin(plugin *plugin_node){
303
304
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
305
free(*arg);
306
}
307
free(plugin_node->argv);
308
for(char **env = plugin_node->environ; *env != NULL; env++){
309
free(*env);
310
}
311
free(plugin_node->environ);
312
free(plugin_node->buffer);
313
314
/* Removes the plugin from the singly-linked list */
315
if(plugin_node == plugin_list){
316
/* First one - simple */
317
plugin_list = plugin_list->next;
318
} else {
319
/* Second one or later */
320
for(plugin *p = plugin_list; p != NULL; p = p->next){
321
if(p->next == plugin_node){
322
p->next = plugin_node->next;
323
break;
324
}
325
}
326
}
327
328
free(plugin_node);
329
}
330
331
static void free_plugin_list(void){
332
while(plugin_list != NULL){
333
free_plugin(plugin_list);
252
static void free_plugin_list(plugin *plugin_list){
253
for(plugin *next; plugin_list != NULL; plugin_list = next){
254
next = plugin_list->next;
255
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
256
free(*arg);
257
}
258
free(plugin_list->argv);
259
for(char **env = plugin_list->environ; *env != NULL; env++){
260
free(*env);
261
}
262
free(plugin_list->environ);
263
free(plugin_list);
334
264
}
335
265
}
336
266
344
274
struct stat st;
345
275
fd_set rfds_all;
346
276
int ret, maxfd = 0;
347
ssize_t sret;
348
277
uid_t uid = 65534;
349
278
gid_t gid = 65534;
350
279
bool debug = false;
359
288
sigemptyset(&sigchld_action.sa_mask);
360
289
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
361
290
if(ret == -1){
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
364
293
goto fallback;
365
294
}
366
295
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
367
296
if(ret == -1){
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
370
299
goto fallback;
371
300
}
372
301
375
304
{ .name = "global-options", .key = 'g',
376
305
.arg = "OPTION[,OPTION[,...]]",
377
306
.doc = "Options passed to all plugins" },
378
{ .name = "global-env", .key = 'G',
307
{ .name = "global-envs", .key = 'e',
379
308
.arg = "VAR=value",
380
309
.doc = "Environment variable passed to all plugins" },
381
310
{ .name = "options-for", .key = 'o',
382
311
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
383
312
.doc = "Options passed only to specified plugin" },
384
{ .name = "env-for", .key = 'E',
313
{ .name = "envs-for", .key = 'f',
385
314
.arg = "PLUGIN:ENV=value",
386
315
.doc = "Environment variable passed to specified plugin" },
387
316
{ .name = "disable", .key = 'd',
388
317
.arg = "PLUGIN",
389
318
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
393
319
{ .name = "plugin-dir", .key = 128,
394
320
.arg = "DIRECTORY",
395
321
.doc = "Specify a different plugin directory", .group = 2 },
404
330
.doc = "Group ID the plugins will run as", .group = 3 },
405
331
{ .name = "debug", .key = 132,
406
332
.doc = "Debug mode", .group = 4 },
407
/*
408
* These reproduce what we would get without ARGP_NO_HELP
409
*/
410
{ .name = "help", .key = '?',
411
.doc = "Give this help list", .group = -1 },
412
{ .name = "usage", .key = -3,
413
.doc = "Give a short usage message", .group = -1 },
414
{ .name = "version", .key = 'V',
415
.doc = "Print program version", .group = -1 },
416
333
{ .name = NULL }
417
334
};
418
335
419
error_t parse_opt(int key, char *arg, struct argp_state *state){
420
errno = 0;
421
switch(key){
422
char *tmp;
423
intmax_t tmpmax;
424
case 'g': /* --global-options */
425
{
426
char *plugin_option;
427
while((plugin_option = strsep(&arg, ",")) != NULL){
428
if(not add_argument(getplugin(NULL), plugin_option)){
429
break;
430
}
431
}
432
}
433
break;
434
case 'G': /* --global-env */
435
add_environment(getplugin(NULL), arg, true);
436
break;
437
case 'o': /* --options-for */
438
{
439
char *option_list = strchr(arg, ':');
440
if(option_list == NULL){
441
argp_error(state, "No colon in \"%s\"", arg);
442
errno = EINVAL;
443
break;
444
}
445
*option_list = '\0';
446
option_list++;
447
if(arg[0] == '\0'){
448
argp_error(state, "Empty plugin name");
449
errno = EINVAL;
450
break;
451
}
452
char *option;
453
while((option = strsep(&option_list, ",")) != NULL){
454
if(not add_argument(getplugin(arg), option)){
455
break;
456
}
457
}
458
}
459
break;
460
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
}
461
397
{
462
398
char *envdef = strchr(arg, ':');
463
399
if(envdef == NULL){
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
469
406
envdef++;
470
if(arg[0] == '\0'){
471
argp_error(state, "Empty plugin name");
472
errno = EINVAL;
473
break;
474
}
475
add_environment(getplugin(arg), envdef, true);
476
}
477
break;
478
case 'd': /* --disable */
479
{
480
plugin *p = getplugin(arg);
481
if(p != NULL){
482
p->disabled = true;
483
}
484
}
485
break;
486
case 'e': /* --enable */
487
{
488
plugin *p = getplugin(arg);
489
if(p != NULL){
490
p->disabled = false;
491
}
492
}
493
break;
494
case 128: /* --plugin-dir */
495
free(plugindir);
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:
496
422
plugindir = strdup(arg);
497
break;
498
case 129: /* --config-file */
499
/* This is already done by parse_opt_config_file() */
500
break;
501
case 130: /* --userid */
502
tmpmax = strtoimax(arg, &tmp, 10);
503
if(errno != 0 or tmp == arg or *tmp != '\0'
504
or tmpmax != (uid_t)tmpmax){
505
argp_error(state, "Bad user ID number: \"%s\", using %"
506
PRIdMAX, arg, (intmax_t)uid);
507
break;
508
}
509
uid = (uid_t)tmpmax;
510
break;
511
case 131: /* --groupid */
512
tmpmax = strtoimax(arg, &tmp, 10);
513
if(errno != 0 or tmp == arg or *tmp != '\0'
514
or tmpmax != (gid_t)tmpmax){
515
argp_error(state, "Bad group ID number: \"%s\", using %"
516
PRIdMAX, arg, (intmax_t)gid);
517
break;
518
}
519
gid = (gid_t)tmpmax;
520
break;
521
case 132: /* --debug */
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
428
argfile = strdup(arg);
429
if(argfile == NULL){
430
perror("strdup");
431
}
432
break;
433
case 130:
434
uid = (uid_t)strtol(arg, NULL, 10);
435
break;
436
case 131:
437
gid = (gid_t)strtol(arg, NULL, 10);
438
break;
439
case 132:
522
440
debug = true;
523
441
break;
524
/*
525
* These reproduce what we would get without ARGP_NO_HELP
526
*/
527
case '?': /* --help */
528
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
529
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
530
case -3: /* --usage */
531
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
532
argp_state_help(state, state->out_stream,
533
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
534
case 'V': /* --version */
535
fprintf(state->out_stream, "%s\n", argp_program_version);
536
exit(EXIT_SUCCESS);
537
break;
538
/*
539
* When adding more options before this line, remember to also add a
540
* "case" to the "parse_opt_config_file" function below.
541
*/
542
case ARGP_KEY_ARG:
543
/* Cryptsetup always passes an argument, which is an empty
544
string if "none" was specified in /etc/crypttab. So if
545
argument was empty, we ignore it silently. */
546
if(arg[0] == '\0'){
547
break;
548
}
549
default:
550
return ARGP_ERR_UNKNOWN;
551
}
552
return errno; /* Set to 0 at start */
553
}
554
555
/* This option parser is the same as parse_opt() above, except it
556
ignores everything but the --config-file option. */
557
error_t parse_opt_config_file(int key, char *arg,
558
__attribute__((unused))
559
struct argp_state *state){
560
errno = 0;
561
switch(key){
562
case 'g': /* --global-options */
563
case 'G': /* --global-env */
564
case 'o': /* --options-for */
565
case 'E': /* --env-for */
566
case 'd': /* --disable */
567
case 'e': /* --enable */
568
case 128: /* --plugin-dir */
569
break;
570
case 129: /* --config-file */
571
free(argfile);
572
argfile = strdup(arg);
573
break;
574
case 130: /* --userid */
575
case 131: /* --groupid */
576
case 132: /* --debug */
577
case '?': /* --help */
578
case -3: /* --usage */
579
case 'V': /* --version */
580
case ARGP_KEY_ARG:
581
break;
582
default:
583
return ARGP_ERR_UNKNOWN;
584
}
585
return errno;
586
}
587
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
442
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
break;
447
default:
448
return ARGP_ERR_UNKNOWN;
449
}
450
return 0;
451
}
452
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
591
457
.doc = "Mandos plugin runner -- Run plugins" };
592
458
593
/* Parse using parse_opt_config_file() in order to get the custom
594
config file location, if any. */
595
ret = argp_parse(&argp, argc, argv,
596
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
597
NULL, NULL);
598
switch(ret){
599
case 0:
600
break;
601
case ENOMEM:
602
default:
603
errno = ret;
604
error(0, errno, "argp_parse");
605
exitstatus = EX_OSERR;
606
goto fallback;
607
case EINVAL:
608
exitstatus = EX_USAGE;
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
461
fprintf(stderr, "Unknown error while parsing arguments\n");
462
exitstatus = EXIT_FAILURE;
609
463
goto fallback;
610
464
}
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
465
466
if (argfile == NULL){
617
467
conffp = fopen(AFILE, "r");
618
468
} else {
619
469
conffp = fopen(argfile, "r");
620
470
}
471
621
472
if(conffp != NULL){
622
473
char *org_line = NULL;
623
474
char *p, *arg, *new_arg, *line;
624
475
size_t size = 0;
476
ssize_t sret;
625
477
const char whitespace_delims[] = " \r\t\f\v\n";
626
478
const char comment_delim[] = "#";
627
479
628
480
custom_argc = 1;
629
481
custom_argv = malloc(sizeof(char*) * 2);
630
482
if(custom_argv == NULL){
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
633
485
goto fallback;
634
486
}
635
487
custom_argv[0] = argv[0];
636
488
custom_argv[1] = NULL;
637
489
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
640
490
while(true){
641
491
sret = getline(&org_line, &size, conffp);
642
492
if(sret == -1){
643
493
break;
644
494
}
645
495
646
496
line = org_line;
647
497
arg = strsep(&line, comment_delim);
648
498
while((p = strsep(&arg, whitespace_delims)) != NULL){
651
501
}
652
502
new_arg = strdup(p);
653
503
if(new_arg == NULL){
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
656
506
free(org_line);
657
507
goto fallback;
658
508
}
661
511
custom_argv = realloc(custom_argv, sizeof(char *)
662
512
* ((unsigned int) custom_argc + 1));
663
513
if(custom_argv == NULL){
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
666
516
free(org_line);
667
517
goto fallback;
668
518
}
669
519
custom_argv[custom_argc-1] = new_arg;
670
custom_argv[custom_argc] = NULL;
520
custom_argv[custom_argc] = NULL;
671
521
}
672
522
}
673
do {
674
ret = fclose(conffp);
675
} while(ret == EOF and errno == EINTR);
676
if(ret == EOF){
677
error(0, errno, "fclose");
678
exitstatus = EX_IOERR;
679
goto fallback;
680
}
681
523
free(org_line);
682
} else {
524
} else{
683
525
/* Check for harmful errors and go to fallback. Other errors might
684
526
not affect opening plugins */
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
688
530
goto fallback;
689
531
}
690
532
}
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
533
693
534
if(custom_argv != NULL){
694
ret = argp_parse(&argp, custom_argc, custom_argv,
695
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
696
NULL, NULL);
697
switch(ret){
698
case 0:
699
break;
700
case ENOMEM:
701
default:
702
errno = ret;
703
error(0, errno, "argp_parse");
704
exitstatus = EX_OSERR;
705
goto fallback;
706
case EINVAL:
707
exitstatus = EX_CONFIG;
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
537
fprintf(stderr, "Unknown error while parsing arguments\n");
538
exitstatus = EXIT_FAILURE;
708
539
goto fallback;
709
540
}
710
541
}
711
542
712
/* Parse actual command line arguments, to let them override the
713
config file */
714
ret = argp_parse(&argp, argc, argv,
715
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
716
NULL, NULL);
717
switch(ret){
718
case 0:
719
break;
720
case ENOMEM:
721
default:
722
errno = ret;
723
error(0, errno, "argp_parse");
724
exitstatus = EX_OSERR;
725
goto fallback;
726
case EINVAL:
727
exitstatus = EX_USAGE;
728
goto fallback;
729
}
730
731
543
if(debug){
732
544
for(plugin *p = plugin_list; p != NULL; p=p->next){
733
545
fprintf(stderr, "Plugin: %s has %d arguments\n",
735
547
for(char **a = p->argv; *a != NULL; a++){
736
548
fprintf(stderr, "\tArg: %s\n", *a);
737
549
}
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
739
551
for(char **a = p->environ; *a != NULL; a++){
740
552
fprintf(stderr, "\t%s\n", *a);
741
553
}
742
554
}
743
555
}
744
556
745
/* Strip permissions down to nobody */
557
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
746
562
setgid(gid);
747
if(ret == -1){
748
error(0, errno, "setgid");
749
}
750
ret = setuid(uid);
751
if(ret == -1){
752
error(0, errno, "setuid");
753
}
754
755
/* Open plugin directory with close_on_exec flag */
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
568
dir = opendir(PDIR);
569
} else {
570
dir = opendir(plugindir);
571
}
572
573
if(dir == NULL){
574
perror("Could not open plugin dir");
575
exitstatus = EXIT_FAILURE;
576
goto fallback;
577
}
578
579
/* Set the FD_CLOEXEC flag on the directory, if possible */
756
580
{
757
int dir_fd = -1;
758
if(plugindir == NULL){
759
dir_fd = open(PDIR, O_RDONLY |
760
#ifdef O_CLOEXEC
761
O_CLOEXEC
762
#else /* not O_CLOEXEC */
763
0
764
#endif /* not O_CLOEXEC */
765
);
766
} else {
767
dir_fd = open(plugindir, O_RDONLY |
768
#ifdef O_CLOEXEC
769
O_CLOEXEC
770
#else /* not O_CLOEXEC */
771
0
772
#endif /* not O_CLOEXEC */
773
);
774
}
775
if(dir_fd == -1){
776
error(0, errno, "Could not open plugin dir");
777
exitstatus = EX_UNAVAILABLE;
778
goto fallback;
779
}
780
781
#ifndef O_CLOEXEC
782
/* Set the FD_CLOEXEC flag on the directory */
783
ret = set_cloexec_flag(dir_fd);
784
if(ret < 0){
785
error(0, errno, "set_cloexec_flag");
786
TEMP_FAILURE_RETRY(close(dir_fd));
787
exitstatus = EX_OSERR;
788
goto fallback;
789
}
790
#endif /* O_CLOEXEC */
791
792
dir = fdopendir(dir_fd);
793
if(dir == NULL){
794
error(0, errno, "Could not open plugin dir");
795
TEMP_FAILURE_RETRY(close(dir_fd));
796
exitstatus = EX_OSERR;
797
goto fallback;
581
int dir_fd = dirfd(dir);
582
if(dir_fd >= 0){
583
ret = set_cloexec_flag(dir_fd);
584
if(ret < 0){
585
perror("set_cloexec_flag");
586
exitstatus = EXIT_FAILURE;
587
goto fallback;
588
}
798
589
}
799
590
}
800
591
801
592
FD_ZERO(&rfds_all);
802
593
803
/* Read and execute any executable in the plugin directory*/
804
594
while(true){
805
do {
806
dirst = readdir(dir);
807
} while(dirst == NULL and errno == EINTR);
595
dirst = readdir(dir);
808
596
809
/* All directory entries have been processed */
597
// All directory entries have been processed
810
598
if(dirst == NULL){
811
if(errno == EBADF){
812
error(0, errno, "readdir");
813
exitstatus = EX_IOERR;
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
814
602
goto fallback;
815
603
}
816
604
break;
818
606
819
607
d_name_len = strlen(dirst->d_name);
820
608
821
/* Ignore dotfiles, backup files and other junk */
609
// Ignore dotfiles, backup files and other junk
822
610
{
823
611
bool bad_name = false;
824
612
826
614
827
615
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
828
616
".dpkg-old",
829
".dpkg-bak",
830
617
".dpkg-divert", NULL };
831
618
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
832
619
size_t pre_len = strlen(*pre);
840
627
break;
841
628
}
842
629
}
630
843
631
if(bad_name){
844
632
continue;
845
633
}
634
846
635
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
847
636
size_t suf_len = strlen(*suf);
848
637
if((d_name_len >= suf_len)
849
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
850
639
== 0)){
851
640
if(debug){
852
641
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
861
650
continue;
862
651
}
863
652
}
864
653
865
654
char *filename;
866
if(plugindir == NULL){
867
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
868
dirst->d_name));
869
} else {
870
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
871
plugindir,
872
dirst->d_name));
873
}
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
874
656
if(ret < 0){
875
error(0, errno, "asprintf");
657
perror("asprintf");
876
658
continue;
877
659
}
878
660
879
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
880
if(ret == -1){
881
error(0, errno, "stat");
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
882
664
free(filename);
883
665
continue;
884
666
}
885
667
886
/* Ignore non-executable files */
887
if(not S_ISREG(st.st_mode)
888
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
889
669
if(debug){
890
670
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
891
671
" with bad type or mode\n", filename);
893
673
free(filename);
894
674
continue;
895
675
}
896
897
plugin *p = getplugin(dirst->d_name);
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
898
677
if(p == NULL){
899
error(0, errno, "getplugin");
678
perror("getplugin");
900
679
free(filename);
901
680
continue;
902
681
}
910
689
}
911
690
{
912
691
/* Add global arguments to argument list for this plugin */
913
plugin *g = getplugin(NULL);
692
plugin *g = getplugin(NULL, &plugin_list);
914
693
if(g != NULL){
915
694
for(char **a = g->argv + 1; *a != NULL; a++){
916
695
if(not add_argument(p, *a)){
917
error(0, errno, "add_argument");
696
perror("add_argument");
918
697
}
919
698
}
920
699
/* Add global environment variables */
921
700
for(char **e = g->environ; *e != NULL; e++){
922
if(not add_environment(p, *e, false)){
923
error(0, errno, "add_environment");
701
if(not add_environment(p, *e)){
702
perror("add_environment");
924
703
}
925
704
}
926
705
}
930
709
process, too. */
931
710
if(p->environ[0] != NULL){
932
711
for(char **e = environ; *e != NULL; e++){
933
if(not add_environment(p, *e, false)){
934
error(0, errno, "add_environment");
712
char *copy = strdup(*e);
713
if(copy == NULL){
714
perror("strdup");
715
continue;
716
}
717
if(not add_environment(p, copy)){
718
perror("add_environment");
935
719
}
936
720
}
937
721
}
938
722
939
723
int pipefd[2];
940
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
941
if(ret == -1){
942
error(0, errno, "pipe");
943
exitstatus = EX_OSERR;
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
944
728
goto fallback;
945
729
}
946
/* Ask OS to automatic close the pipe on exec */
947
730
ret = set_cloexec_flag(pipefd[0]);
948
731
if(ret < 0){
949
error(0, errno, "set_cloexec_flag");
950
exitstatus = EX_OSERR;
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
951
734
goto fallback;
952
735
}
953
736
ret = set_cloexec_flag(pipefd[1]);
954
737
if(ret < 0){
955
error(0, errno, "set_cloexec_flag");
956
exitstatus = EX_OSERR;
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
957
740
goto fallback;
958
741
}
959
742
/* Block SIGCHLD until process is safely in process list */
960
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
961
&sigchld_action.sa_mask,
962
NULL));
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
744
if(ret < 0){
964
error(0, errno, "sigprocmask");
965
exitstatus = EX_OSERR;
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
966
747
goto fallback;
967
748
}
968
/* Starting a new process to be watched */
969
pid_t pid;
970
do {
971
pid = fork();
972
} while(pid == -1 and errno == EINTR);
749
// Starting a new process to be watched
750
pid_t pid = fork();
973
751
if(pid == -1){
974
error(0, errno, "fork");
975
exitstatus = EX_OSERR;
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
976
754
goto fallback;
977
755
}
978
756
if(pid == 0){
979
757
/* this is the child process */
980
758
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
981
759
if(ret < 0){
982
error(0, errno, "sigaction");
983
_exit(EX_OSERR);
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
984
762
}
985
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
986
764
if(ret < 0){
987
error(0, errno, "sigprocmask");
988
_exit(EX_OSERR);
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
989
767
}
990
768
991
769
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
992
770
if(ret == -1){
993
error(0, errno, "dup2");
994
_exit(EX_OSERR);
771
perror("dup2");
772
_exit(EXIT_FAILURE);
995
773
}
996
774
997
775
if(dirfd(dir) < 0){
1001
779
}
1002
780
if(p->environ[0] == NULL){
1003
781
if(execv(filename, p->argv) < 0){
1004
error(0, errno, "execv for %s", filename);
1005
_exit(EX_OSERR);
782
perror("execv");
783
_exit(EXIT_FAILURE);
1006
784
}
1007
785
} else {
1008
786
if(execve(filename, p->argv, p->environ) < 0){
1009
error(0, errno, "execve for %s", filename);
1010
_exit(EX_OSERR);
787
perror("execve");
788
_exit(EXIT_FAILURE);
1011
789
}
1012
790
}
1013
791
/* no return */
1014
792
}
1015
/* Parent process */
1016
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1017
pipe */
793
/* parent process */
1018
794
free(filename);
1019
plugin *new_plugin = getplugin(dirst->d_name);
1020
if(new_plugin == NULL){
1021
error(0, errno, "getplugin");
1022
ret = (int)(TEMP_FAILURE_RETRY
1023
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1024
NULL)));
795
close(pipefd[1]); /* close unused write end of pipe */
796
process *new_process = malloc(sizeof(process));
797
if (new_process == NULL){
798
perror("malloc");
799
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1025
800
if(ret < 0){
1026
error(0, errno, "sigprocmask");
801
perror("sigprocmask");
1027
802
}
1028
exitstatus = EX_OSERR;
803
exitstatus = EXIT_FAILURE;
1029
804
goto fallback;
1030
805
}
1031
806
1032
new_plugin->pid = pid;
1033
new_plugin->fd = pipefd[0];
1034
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1035
812
/* Unblock SIGCHLD so signal handler can be run if this process
1036
813
has already completed */
1037
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1040
815
if(ret < 0){
1041
error(0, errno, "sigprocmask");
1042
exitstatus = EX_OSERR;
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1043
818
goto fallback;
1044
819
}
1045
820
1046
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1047
-Wconversion */
821
FD_SET(new_process->fd, &rfds_all);
1048
822
1049
if(maxfd < new_plugin->fd){
1050
maxfd = new_plugin->fd;
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1051
825
}
826
1052
827
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
1053
831
1054
TEMP_FAILURE_RETRY(closedir(dir));
832
closedir(dir);
1055
833
dir = NULL;
1056
free_plugin(getplugin(NULL));
1057
1058
for(plugin *p = plugin_list; p != NULL; p = p->next){
1059
if(p->pid != 0){
1060
break;
1061
}
1062
if(p->next == NULL){
1063
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1064
" directory?\n");
1065
free_plugin_list();
1066
}
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1067
839
}
1068
1069
/* Main loop while running plugins exist */
1070
while(plugin_list){
840
while(process_list){
1071
841
fd_set rfds = rfds_all;
1072
842
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
1073
if(select_ret == -1 and errno != EINTR){
1074
error(0, errno, "select");
1075
exitstatus = EX_OSERR;
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1076
846
goto fallback;
1077
847
}
1078
848
/* OK, now either a process completed, or something can be read
1079
849
from one of them */
1080
for(plugin *proc = plugin_list; proc != NULL;){
850
for(process *proc = process_list; proc ; proc = proc->next){
1081
851
/* Is this process completely done? */
1082
if(proc->completed and proc->eof){
852
if(proc->eof and proc->completed){
1083
853
/* Only accept the plugin output if it exited cleanly */
1084
854
if(not WIFEXITED(proc->status)
1085
855
or WEXITSTATUS(proc->status) != 0){
1086
856
/* Bad exit by plugin */
1087
1088
857
if(debug){
1089
858
if(WIFEXITED(proc->status)){
1090
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1091
" status %d\n", proc->name,
1092
(intmax_t) (proc->pid),
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1093
861
WEXITSTATUS(proc->status));
1094
} else if(WIFSIGNALED(proc->status)){
1095
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1096
" signal %d: %s\n", proc->name,
1097
(intmax_t) (proc->pid),
1098
WTERMSIG(proc->status),
1099
strsignal(WTERMSIG(proc->status)));
862
} else if(WIFSIGNALED(proc->status)) {
863
fprintf(stderr, "Plugin %u killed by signal %d\n",
864
(unsigned int) (proc->pid),
865
WTERMSIG(proc->status));
1100
866
} else if(WCOREDUMP(proc->status)){
1101
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1102
" core\n", proc->name, (intmax_t) (proc->pid));
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1103
869
}
1104
870
}
1105
1106
871
/* Remove the plugin */
1107
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1108
-Wconversion */
1109
872
FD_CLR(proc->fd, &rfds_all);
1110
873
/* Block signal while modifying process_list */
1111
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1112
(SIG_BLOCK,
1113
&sigchld_action.sa_mask,
1114
NULL));
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1115
875
if(ret < 0){
1116
error(0, errno, "sigprocmask");
1117
exitstatus = EX_OSERR;
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1118
878
goto fallback;
1119
879
}
1120
1121
plugin *next_plugin = proc->next;
1122
free_plugin(proc);
1123
proc = next_plugin;
1124
880
/* Delete this process entry from the list */
881
if(process_list == proc){
882
/* First one - simple */
883
process_list = proc->next;
884
} else {
885
/* Second one or later */
886
for(process *p = process_list; p != NULL; p = p->next){
887
if(p->next == proc){
888
p->next = proc->next;
889
break;
890
}
891
}
892
}
1125
893
/* We are done modifying process list, so unblock signal */
1126
ret = (int)(TEMP_FAILURE_RETRY
1127
(sigprocmask(SIG_UNBLOCK,
1128
&sigchld_action.sa_mask, NULL)));
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1129
896
if(ret < 0){
1130
error(0, errno, "sigprocmask");
1131
exitstatus = EX_OSERR;
1132
goto fallback;
1133
}
1134
1135
if(plugin_list == NULL){
1136
break;
1137
}
1138
1139
continue;
897
perror("sigprocmask");
898
}
899
free(proc->buffer);
900
free(proc);
901
/* We deleted this process from the list, so we can't go
902
proc->next. Therefore, start over from the beginning of
903
the process list */
904
break;
1140
905
}
1141
1142
906
/* This process exited nicely, so print its buffer */
1143
907
1144
908
bool bret = print_out_password(proc->buffer,
1145
909
proc->buffer_length);
1146
910
if(not bret){
1147
error(0, errno, "print_out_password");
1148
exitstatus = EX_IOERR;
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1149
913
}
1150
914
goto fallback;
1151
915
}
1152
1153
916
/* This process has not completed. Does it have any output? */
1154
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1155
warning from
1156
-Wconversion */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1157
918
/* This process had nothing to say at this time */
1158
proc = proc->next;
1159
919
continue;
1160
920
}
1161
921
/* Before reading, make the process' data buffer large enough */
1162
922
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1163
923
proc->buffer = realloc(proc->buffer, proc->buffer_size
1164
924
+ (size_t) BUFFER_SIZE);
1165
if(proc->buffer == NULL){
1166
error(0, errno, "malloc");
1167
exitstatus = EX_OSERR;
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1168
928
goto fallback;
1169
929
}
1170
930
proc->buffer_size += BUFFER_SIZE;
1171
931
}
1172
932
/* Read from the process */
1173
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1174
proc->buffer
1175
+ proc->buffer_length,
1176
BUFFER_SIZE));
1177
if(sret < 0){
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1178
936
/* Read error from this process; ignore the error */
1179
proc = proc->next;
1180
937
continue;
1181
938
}
1182
if(sret == 0){
939
if(ret == 0){
1183
940
/* got EOF */
1184
941
proc->eof = true;
1185
942
} else {
1186
proc->buffer_length += (size_t) sret;
943
proc->buffer_length += (size_t) ret;
1187
944
}
1188
945
}
1189
946
}
1190
1191
947
948
1192
949
fallback:
1193
950
1194
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1195
and exitstatus != EX_OK)){
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1196
952
/* Fallback if all plugins failed, none are found or an error
1197
953
occured */
1198
954
bool bret;
1199
955
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1200
956
char *passwordbuffer = getpass("Password: ");
1201
size_t len = strlen(passwordbuffer);
1202
/* Strip trailing newline */
1203
if(len > 0 and passwordbuffer[len-1] == '\n'){
1204
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1205
len--;
1206
}
1207
bret = print_out_password(passwordbuffer, len);
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1208
958
if(not bret){
1209
error(0, errno, "print_out_password");
1210
exitstatus = EX_IOERR;
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1211
961
}
1212
962
}
1213
963
1214
964
/* Restore old signal handler */
1215
965
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1216
966
if(ret == -1){
1217
error(0, errno, "sigaction");
1218
exitstatus = EX_OSERR;
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1219
969
}
1220
970
1221
971
if(custom_argv != NULL){
1222
972
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1223
973
free(*arg);
1224
974
}
1225
975
free(custom_argv);
1226
976
}
977
free_plugin_list(plugin_list);
1227
978
1228
979
if(dir != NULL){
1229
980
closedir(dir);
1230
981
}
1231
982
1232
/* Kill the processes */
1233
for(plugin *p = plugin_list; p != NULL; p = p->next){
1234
if(p->pid != 0){
1235
close(p->fd);
1236
ret = kill(p->pid, SIGTERM);
1237
if(ret == -1 and errno != ESRCH){
1238
/* Set-uid proccesses might not get closed */
1239
error(0, errno, "kill");
1240
}
983
/* Free the process list and kill the processes */
984
for(process *next; process_list != NULL; process_list = next){
985
next = process_list->next;
986
close(process_list->fd);
987
ret = kill(process_list->pid, SIGTERM);
988
if(ret == -1 and errno != ESRCH){
989
/* set-uid proccesses migth not get closed */
990
perror("kill");
1241
991
}
992
free(process_list->buffer);
993
free(process_list);
1242
994
}
1243
995
1244
996
/* Wait for any remaining child processes to terminate */
1245
do {
997
do{
1246
998
ret = wait(NULL);
1247
999
} while(ret >= 0);
1248
1000
if(errno != ECHILD){
1249
error(0, errno, "wait");
1001
perror("wait");
1250
1002
}
1251
1252
free_plugin_list();
1253
1003
1254
1004
free(plugindir);
1255
1005
free(argfile);
1256
1006
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0