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- Committer: Teddy Hogeborn
- Date: 2012-06-17 14:55:31 UTC
- Revision ID: teddy@recompile.se-20120617145531-o24z982oerm6xb6s
* mandos: New "--foreground" option.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugin-runner.c
1
/* -*- coding: utf-8 -*- */
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008-2012 Teddy Hogeborn
6
* Copyright © 2008-2012 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
18
19
* along with this program. If not, see
19
20
* <http://www.gnu.org/licenses/>.
20
21
*
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <mandos@recompile.se>.
22
23
*/
23
24
24
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
asprintf(), O_CLOEXEC */
26
27
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
28
#include <stdlib.h> /* malloc(), exit(), EXIT_SUCCESS,
29
realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
31
#include <stdio.h> /* fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
33
#include <sys/types.h> /* DIR, fdopendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
35
36
uid_t, gid_t, getuid(), getgid(),
37
38
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
39
FD_SET(), FD_ISSET(), FD_CLR */
39
40
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
WEXITSTATUS(), WTERMSIG(),
42
WCOREDUMP() */
41
43
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
42
44
#include <iso646.h> /* and, or, not */
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
45
#include <dirent.h> /* DIR, struct dirent, fdopendir(),
44
46
readdir(), closedir(), dirfd() */
45
47
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
46
48
fcntl(), setuid(), setgid(),
47
49
F_GETFD, F_SETFD, FD_CLOEXEC,
48
50
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
51
dup2(), STDOUT_FILENO, _exit(),
50
52
execv(), write(), read(),
51
53
close() */
52
54
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
55
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
#include <string.h> /* strsep, strlen(), asprintf(),
57
strsignal(), strcmp(), strncmp() */
55
58
#include <errno.h> /* errno */
56
59
#include <argp.h> /* struct argp_option, struct
57
60
argp_state, struct argp,
61
64
#include <signal.h> /* struct sigaction, sigemptyset(),
62
65
sigaddset(), sigaction(),
63
66
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
67
SIG_UNBLOCK, kill(), sig_atomic_t
68
*/
65
69
#include <errno.h> /* errno, EBADF */
70
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
71
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_IOERR,
72
EX_CONFIG, EX_UNAVAILABLE, EX_OK */
73
#include <errno.h> /* errno */
74
#include <error.h> /* error() */
66
75
67
76
#define BUFFER_SIZE 256
68
77
69
78
#define PDIR "/lib/mandos/plugins.d"
70
79
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
80
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
81
const char *argp_program_version = "plugin-runner " VERSION;
82
const char *argp_program_bug_address = "<mandos@recompile.se>";
88
83
89
84
typedef struct plugin{
90
85
char *name; /* can be NULL or any plugin name */
93
88
char **environ;
94
89
int envc;
95
90
bool disabled;
91
92
/* Variables used for running processes*/
93
pid_t pid;
94
int fd;
95
char *buffer;
96
size_t buffer_size;
97
size_t buffer_length;
98
bool eof;
99
volatile sig_atomic_t completed;
100
int status;
96
101
struct plugin *next;
97
102
} plugin;
98
103
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))){
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))){
103
113
return p;
104
114
}
105
115
}
106
116
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
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){
109
122
return NULL;
110
123
}
111
124
char *copy_name = NULL;
112
125
if(name != NULL){
113
copy_name = strdup(name);
126
do {
127
copy_name = strdup(name);
128
} while(copy_name == NULL and errno == EINTR);
114
129
if(copy_name == NULL){
130
int e = errno;
131
free(new_plugin);
132
errno = e;
115
133
return NULL;
116
134
}
117
135
}
118
136
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
137
*new_plugin = (plugin){ .name = copy_name,
138
.argc = 1,
139
.disabled = false,
140
.next = plugin_list };
124
141
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
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;
127
147
free(copy_name);
128
148
free(new_plugin);
149
errno = e;
129
150
return NULL;
130
151
}
131
152
new_plugin->argv[0] = copy_name;
132
153
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
154
155
do {
156
new_plugin->environ = malloc(sizeof(char *));
157
} while(new_plugin->environ == NULL and errno == EINTR);
135
158
if(new_plugin->environ == NULL){
159
int e = errno;
136
160
free(copy_name);
137
161
free(new_plugin->argv);
138
162
free(new_plugin);
163
errno = e;
139
164
return NULL;
140
165
}
141
166
new_plugin->environ[0] = NULL;
167
142
168
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
169
plugin_list = new_plugin;
144
170
return new_plugin;
145
171
}
146
172
147
173
/* Helper function for add_argument and add_environment */
174
__attribute__((nonnull))
148
175
static bool add_to_char_array(const char *new, char ***array,
149
176
int *len){
150
177
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
178
do {
179
*array = realloc(*array, sizeof(char *)
180
* (size_t) ((*len) + 2));
181
} while(*array == NULL and errno == EINTR);
153
182
/* Malloc check */
154
183
if(*array == NULL){
155
184
return false;
156
185
}
157
186
/* Make a copy of the new string */
158
char *copy = strdup(new);
187
char *copy;
188
do {
189
copy = strdup(new);
190
} while(copy == NULL and errno == EINTR);
159
191
if(copy == NULL){
160
192
return false;
161
193
}
168
200
}
169
201
170
202
/* Add to a plugin's argument vector */
203
__attribute__((nonnull(2)))
171
204
static bool add_argument(plugin *p, const char *arg){
172
205
if(p == NULL){
173
206
return false;
176
209
}
177
210
178
211
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
212
__attribute__((nonnull(2)))
213
static bool add_environment(plugin *p, const char *def, bool replace){
180
214
if(p == NULL){
181
215
return false;
182
216
}
217
/* namelen = length of name of environment variable */
218
size_t namelen = (size_t)(strchrnul(def, '=') - def);
219
/* Search for this environment variable */
220
for(char **e = p->environ; *e != NULL; e++){
221
if(strncmp(*e, def, namelen + 1) == 0){
222
/* It already exists */
223
if(replace){
224
char *new;
225
do {
226
new = realloc(*e, strlen(def) + 1);
227
} while(new == NULL and errno == EINTR);
228
if(new == NULL){
229
return false;
230
}
231
*e = new;
232
strcpy(*e, def);
233
}
234
return true;
235
}
236
}
183
237
return add_to_char_array(def, &(p->environ), &(p->envc));
184
238
}
185
239
186
187
240
/*
188
241
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
242
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
243
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
244
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
245
static int set_cloexec_flag(int fd){
246
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
195
247
/* If reading the flags failed, return error indication now. */
196
248
if(ret < 0){
197
249
return ret;
198
250
}
199
251
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
252
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
253
ret | FD_CLOEXEC));
201
254
}
202
255
203
process *process_list = NULL;
204
256
205
257
/* Mark processes as completed when they exit, and save their exit
206
258
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
259
static void handle_sigchld(__attribute__((unused)) int sig){
260
int old_errno = errno;
208
261
while(true){
209
process *proc = process_list;
262
plugin *proc = plugin_list;
210
263
int status;
211
264
pid_t pid = waitpid(-1, &status, WNOHANG);
212
265
if(pid == 0){
214
267
break;
215
268
}
216
269
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
270
if(errno == ECHILD){
271
/* No child processes */
272
break;
219
273
}
220
/* No child processes */
221
break;
274
error(0, errno, "waitpid");
222
275
}
223
276
224
277
/* A child exited, find it in process_list */
225
278
while(proc != NULL and proc->pid != pid){
226
279
proc = proc->next;
230
283
continue;
231
284
}
232
285
proc->status = status;
233
proc->completed = true;
286
proc->completed = 1;
234
287
}
288
errno = old_errno;
235
289
}
236
290
237
bool print_out_password(const char *buffer, size_t length){
291
/* Prints out a password to stdout */
292
__attribute__((nonnull))
293
static bool print_out_password(const char *buffer, size_t length){
238
294
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
295
for(size_t written = 0; written < length; written += (size_t)ret){
243
296
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
297
length - written));
249
302
return true;
250
303
}
251
304
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);
305
/* Removes and free a plugin from the plugin list */
306
__attribute__((nonnull))
307
static void free_plugin(plugin *plugin_node){
308
309
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
310
free(*arg);
311
}
312
free(plugin_node->argv);
313
for(char **env = plugin_node->environ; *env != NULL; env++){
314
free(*env);
315
}
316
free(plugin_node->environ);
317
free(plugin_node->buffer);
318
319
/* Removes the plugin from the singly-linked list */
320
if(plugin_node == plugin_list){
321
/* First one - simple */
322
plugin_list = plugin_list->next;
323
} else {
324
/* Second one or later */
325
for(plugin *p = plugin_list; p != NULL; p = p->next){
326
if(p->next == plugin_node){
327
p->next = plugin_node->next;
328
break;
329
}
330
}
331
}
332
333
free(plugin_node);
334
}
335
336
static void free_plugin_list(void){
337
while(plugin_list != NULL){
338
free_plugin(plugin_list);
264
339
}
265
340
}
266
341
274
349
struct stat st;
275
350
fd_set rfds_all;
276
351
int ret, maxfd = 0;
352
ssize_t sret;
277
353
uid_t uid = 65534;
278
354
gid_t gid = 65534;
279
355
bool debug = false;
288
364
sigemptyset(&sigchld_action.sa_mask);
289
365
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
366
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
367
error(0, errno, "sigaddset");
368
exitstatus = EX_OSERR;
293
369
goto fallback;
294
370
}
295
371
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
372
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
373
error(0, errno, "sigaction");
374
exitstatus = EX_OSERR;
299
375
goto fallback;
300
376
}
301
377
304
380
{ .name = "global-options", .key = 'g',
305
381
.arg = "OPTION[,OPTION[,...]]",
306
382
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
383
{ .name = "global-env", .key = 'G',
308
384
.arg = "VAR=value",
309
385
.doc = "Environment variable passed to all plugins" },
310
386
{ .name = "options-for", .key = 'o',
311
387
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
388
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
389
{ .name = "env-for", .key = 'E',
314
390
.arg = "PLUGIN:ENV=value",
315
391
.doc = "Environment variable passed to specified plugin" },
316
392
{ .name = "disable", .key = 'd',
317
393
.arg = "PLUGIN",
318
394
.doc = "Disable a specific plugin", .group = 1 },
395
{ .name = "enable", .key = 'e',
396
.arg = "PLUGIN",
397
.doc = "Enable a specific plugin", .group = 1 },
319
398
{ .name = "plugin-dir", .key = 128,
320
399
.arg = "DIRECTORY",
321
400
.doc = "Specify a different plugin directory", .group = 2 },
330
409
.doc = "Group ID the plugins will run as", .group = 3 },
331
410
{ .name = "debug", .key = 132,
332
411
.doc = "Debug mode", .group = 4 },
412
/*
413
* These reproduce what we would get without ARGP_NO_HELP
414
*/
415
{ .name = "help", .key = '?',
416
.doc = "Give this help list", .group = -1 },
417
{ .name = "usage", .key = -3,
418
.doc = "Give a short usage message", .group = -1 },
419
{ .name = "version", .key = 'V',
420
.doc = "Print program version", .group = -1 },
333
421
{ .name = NULL }
334
422
};
335
423
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
}
424
__attribute__((nonnull(3)))
425
error_t parse_opt(int key, char *arg, struct argp_state *state){
426
errno = 0;
427
switch(key){
428
char *tmp;
429
intmax_t tmp_id;
430
case 'g': /* --global-options */
431
{
432
char *plugin_option;
433
while((plugin_option = strsep(&arg, ",")) != NULL){
434
if(not add_argument(getplugin(NULL), plugin_option)){
435
break;
436
}
437
}
438
}
439
break;
440
case 'G': /* --global-env */
441
add_environment(getplugin(NULL), arg, true);
442
break;
443
case 'o': /* --options-for */
444
{
445
char *option_list = strchr(arg, ':');
446
if(option_list == NULL){
447
argp_error(state, "No colon in \"%s\"", arg);
448
errno = EINVAL;
449
break;
450
}
451
*option_list = '\0';
452
option_list++;
453
if(arg[0] == '\0'){
454
argp_error(state, "Empty plugin name");
455
errno = EINVAL;
456
break;
457
}
458
char *option;
459
while((option = strsep(&option_list, ",")) != NULL){
460
if(not add_argument(getplugin(arg), option)){
461
break;
462
}
463
}
464
}
465
break;
466
case 'E': /* --env-for */
397
467
{
398
468
char *envdef = strchr(arg, ':');
399
469
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
470
argp_error(state, "No colon in \"%s\"", arg);
471
errno = EINVAL;
472
break;
473
}
474
*envdef = '\0';
406
475
envdef++;
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:
476
if(arg[0] == '\0'){
477
argp_error(state, "Empty plugin name");
478
errno = EINVAL;
479
break;
480
}
481
add_environment(getplugin(arg), envdef, true);
482
}
483
break;
484
case 'd': /* --disable */
485
{
486
plugin *p = getplugin(arg);
487
if(p != NULL){
488
p->disabled = true;
489
}
490
}
491
break;
492
case 'e': /* --enable */
493
{
494
plugin *p = getplugin(arg);
495
if(p != NULL){
496
p->disabled = false;
497
}
498
}
499
break;
500
case 128: /* --plugin-dir */
501
free(plugindir);
422
502
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
503
break;
504
case 129: /* --config-file */
505
/* This is already done by parse_opt_config_file() */
506
break;
507
case 130: /* --userid */
508
tmp_id = strtoimax(arg, &tmp, 10);
509
if(errno != 0 or tmp == arg or *tmp != '\0'
510
or tmp_id != (uid_t)tmp_id){
511
argp_error(state, "Bad user ID number: \"%s\", using %"
512
PRIdMAX, arg, (intmax_t)uid);
513
break;
514
}
515
uid = (uid_t)tmp_id;
516
break;
517
case 131: /* --groupid */
518
tmp_id = strtoimax(arg, &tmp, 10);
519
if(errno != 0 or tmp == arg or *tmp != '\0'
520
or tmp_id != (gid_t)tmp_id){
521
argp_error(state, "Bad group ID number: \"%s\", using %"
522
PRIdMAX, arg, (intmax_t)gid);
523
break;
524
}
525
gid = (gid_t)tmp_id;
526
break;
527
case 132: /* --debug */
528
debug = true;
529
break;
530
/*
531
* These reproduce what we would get without ARGP_NO_HELP
532
*/
533
case '?': /* --help */
534
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
535
argp_state_help(state, state->out_stream, ARGP_HELP_STD_HELP);
536
case -3: /* --usage */
537
state->flags &= ~(unsigned int)ARGP_NO_EXIT; /* force exit */
538
argp_state_help(state, state->out_stream,
539
ARGP_HELP_USAGE | ARGP_HELP_EXIT_OK);
540
case 'V': /* --version */
541
fprintf(state->out_stream, "%s\n", argp_program_version);
542
exit(EXIT_SUCCESS);
543
break;
544
/*
545
* When adding more options before this line, remember to also add a
546
* "case" to the "parse_opt_config_file" function below.
547
*/
548
case ARGP_KEY_ARG:
549
/* Cryptsetup always passes an argument, which is an empty
550
string if "none" was specified in /etc/crypttab. So if
551
argument was empty, we ignore it silently. */
552
if(arg[0] == '\0'){
553
break;
554
}
555
default:
556
return ARGP_ERR_UNKNOWN;
557
}
558
return errno; /* Set to 0 at start */
559
}
560
561
/* This option parser is the same as parse_opt() above, except it
562
ignores everything but the --config-file option. */
563
error_t parse_opt_config_file(int key, char *arg,
564
__attribute__((unused))
565
struct argp_state *state){
566
errno = 0;
567
switch(key){
568
case 'g': /* --global-options */
569
case 'G': /* --global-env */
570
case 'o': /* --options-for */
571
case 'E': /* --env-for */
572
case 'd': /* --disable */
573
case 'e': /* --enable */
574
case 128: /* --plugin-dir */
575
break;
576
case 129: /* --config-file */
577
free(argfile);
428
578
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:
440
debug = true;
441
break;
579
break;
580
case 130: /* --userid */
581
case 131: /* --groupid */
582
case 132: /* --debug */
583
case '?': /* --help */
584
case -3: /* --usage */
585
case 'V': /* --version */
442
586
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
587
break;
447
588
default:
448
589
return ARGP_ERR_UNKNOWN;
449
590
}
450
return 0;
591
return errno;
451
592
}
452
593
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
594
struct argp argp = { .options = options,
595
.parser = parse_opt_config_file,
596
.args_doc = "",
457
597
.doc = "Mandos plugin runner -- Run plugins" };
458
598
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;
599
/* Parse using parse_opt_config_file() in order to get the custom
600
config file location, if any. */
601
ret = argp_parse(&argp, argc, argv,
602
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
603
NULL, NULL);
604
switch(ret){
605
case 0:
606
break;
607
case ENOMEM:
608
default:
609
errno = ret;
610
error(0, errno, "argp_parse");
611
exitstatus = EX_OSERR;
612
goto fallback;
613
case EINVAL:
614
exitstatus = EX_USAGE;
463
615
goto fallback;
464
616
}
465
466
if (argfile == NULL){
617
618
/* Reset to the normal argument parser */
619
argp.parser = parse_opt;
620
621
/* Open the configfile if available */
622
if(argfile == NULL){
467
623
conffp = fopen(AFILE, "r");
468
624
} else {
469
625
conffp = fopen(argfile, "r");
470
626
}
471
472
627
if(conffp != NULL){
473
628
char *org_line = NULL;
474
629
char *p, *arg, *new_arg, *line;
475
630
size_t size = 0;
476
ssize_t sret;
477
631
const char whitespace_delims[] = " \r\t\f\v\n";
478
632
const char comment_delim[] = "#";
479
633
480
634
custom_argc = 1;
481
635
custom_argv = malloc(sizeof(char*) * 2);
482
636
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
637
error(0, errno, "malloc");
638
exitstatus = EX_OSERR;
485
639
goto fallback;
486
640
}
487
641
custom_argv[0] = argv[0];
488
642
custom_argv[1] = NULL;
489
643
644
/* for each line in the config file, strip whitespace and ignore
645
commented text */
490
646
while(true){
491
647
sret = getline(&org_line, &size, conffp);
492
648
if(sret == -1){
493
649
break;
494
650
}
495
651
496
652
line = org_line;
497
653
arg = strsep(&line, comment_delim);
498
654
while((p = strsep(&arg, whitespace_delims)) != NULL){
501
657
}
502
658
new_arg = strdup(p);
503
659
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
660
error(0, errno, "strdup");
661
exitstatus = EX_OSERR;
506
662
free(org_line);
507
663
goto fallback;
508
664
}
511
667
custom_argv = realloc(custom_argv, sizeof(char *)
512
668
* ((unsigned int) custom_argc + 1));
513
669
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
670
error(0, errno, "realloc");
671
exitstatus = EX_OSERR;
516
672
free(org_line);
517
673
goto fallback;
518
674
}
519
675
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
676
custom_argv[custom_argc] = NULL;
521
677
}
522
678
}
679
do {
680
ret = fclose(conffp);
681
} while(ret == EOF and errno == EINTR);
682
if(ret == EOF){
683
error(0, errno, "fclose");
684
exitstatus = EX_IOERR;
685
goto fallback;
686
}
523
687
free(org_line);
524
} else{
688
} else {
525
689
/* Check for harmful errors and go to fallback. Other errors might
526
690
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
691
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
692
error(0, errno, "fopen");
693
exitstatus = EX_OSERR;
530
694
goto fallback;
531
695
}
532
696
}
533
697
/* If there were any arguments from the configuration file, pass
698
them to parser as command line arguments */
534
699
if(custom_argv != NULL){
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;
700
ret = argp_parse(&argp, custom_argc, custom_argv,
701
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
702
NULL, NULL);
703
switch(ret){
704
case 0:
705
break;
706
case ENOMEM:
707
default:
708
errno = ret;
709
error(0, errno, "argp_parse");
710
exitstatus = EX_OSERR;
711
goto fallback;
712
case EINVAL:
713
exitstatus = EX_CONFIG;
539
714
goto fallback;
540
715
}
541
716
}
542
717
718
/* Parse actual command line arguments, to let them override the
719
config file */
720
ret = argp_parse(&argp, argc, argv,
721
ARGP_IN_ORDER | ARGP_NO_EXIT | ARGP_NO_HELP,
722
NULL, NULL);
723
switch(ret){
724
case 0:
725
break;
726
case ENOMEM:
727
default:
728
errno = ret;
729
error(0, errno, "argp_parse");
730
exitstatus = EX_OSERR;
731
goto fallback;
732
case EINVAL:
733
exitstatus = EX_USAGE;
734
goto fallback;
735
}
736
543
737
if(debug){
544
738
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
739
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
741
for(char **a = p->argv; *a != NULL; a++){
548
742
fprintf(stderr, "\tArg: %s\n", *a);
549
743
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
744
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
745
for(char **a = p->environ; *a != NULL; a++){
552
746
fprintf(stderr, "\t%s\n", *a);
553
747
}
554
748
}
555
749
}
556
750
751
if(getuid() == 0){
752
/* Work around Debian bug #633582:
753
<http://bugs.debian.org/633582> */
754
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
755
if(plugindir_fd == -1){
756
error(0, errno, "open");
757
} else {
758
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
759
if(ret == -1){
760
error(0, errno, "fstat");
761
} else {
762
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
763
ret = fchown(plugindir_fd, uid, gid);
764
if(ret == -1){
765
error(0, errno, "fchown");
766
}
767
}
768
}
769
TEMP_FAILURE_RETRY(close(plugindir_fd));
770
}
771
}
772
773
/* Lower permissions */
774
setgid(gid);
775
if(ret == -1){
776
error(0, errno, "setgid");
777
}
557
778
ret = setuid(uid);
558
if (ret == -1){
559
perror("setuid");
560
}
561
562
setgid(gid);
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 */
779
if(ret == -1){
780
error(0, errno, "setuid");
781
}
782
783
/* Open plugin directory with close_on_exec flag */
580
784
{
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
}
785
int dir_fd = -1;
786
if(plugindir == NULL){
787
dir_fd = open(PDIR, O_RDONLY |
788
#ifdef O_CLOEXEC
789
O_CLOEXEC
790
#else /* not O_CLOEXEC */
791
0
792
#endif /* not O_CLOEXEC */
793
);
794
} else {
795
dir_fd = open(plugindir, O_RDONLY |
796
#ifdef O_CLOEXEC
797
O_CLOEXEC
798
#else /* not O_CLOEXEC */
799
0
800
#endif /* not O_CLOEXEC */
801
);
802
}
803
if(dir_fd == -1){
804
error(0, errno, "Could not open plugin dir");
805
exitstatus = EX_UNAVAILABLE;
806
goto fallback;
807
}
808
809
#ifndef O_CLOEXEC
810
/* Set the FD_CLOEXEC flag on the directory */
811
ret = set_cloexec_flag(dir_fd);
812
if(ret < 0){
813
error(0, errno, "set_cloexec_flag");
814
TEMP_FAILURE_RETRY(close(dir_fd));
815
exitstatus = EX_OSERR;
816
goto fallback;
817
}
818
#endif /* O_CLOEXEC */
819
820
dir = fdopendir(dir_fd);
821
if(dir == NULL){
822
error(0, errno, "Could not open plugin dir");
823
TEMP_FAILURE_RETRY(close(dir_fd));
824
exitstatus = EX_OSERR;
825
goto fallback;
589
826
}
590
827
}
591
828
592
829
FD_ZERO(&rfds_all);
593
830
831
/* Read and execute any executable in the plugin directory*/
594
832
while(true){
595
dirst = readdir(dir);
833
do {
834
dirst = readdir(dir);
835
} while(dirst == NULL and errno == EINTR);
596
836
597
// All directory entries have been processed
837
/* All directory entries have been processed */
598
838
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
839
if(errno == EBADF){
840
error(0, errno, "readdir");
841
exitstatus = EX_IOERR;
602
842
goto fallback;
603
843
}
604
844
break;
606
846
607
847
d_name_len = strlen(dirst->d_name);
608
848
609
// Ignore dotfiles, backup files and other junk
849
/* Ignore dotfiles, backup files and other junk */
610
850
{
611
851
bool bad_name = false;
612
852
614
854
615
855
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
856
".dpkg-old",
857
".dpkg-bak",
617
858
".dpkg-divert", NULL };
618
859
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
860
size_t pre_len = strlen(*pre);
627
868
break;
628
869
}
629
870
}
630
631
871
if(bad_name){
632
872
continue;
633
873
}
634
635
874
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
875
size_t suf_len = strlen(*suf);
637
876
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
877
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
639
878
== 0)){
640
879
if(debug){
641
880
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
650
889
continue;
651
890
}
652
891
}
653
892
654
893
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
894
if(plugindir == NULL){
895
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
896
dirst->d_name));
897
} else {
898
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
899
plugindir,
900
dirst->d_name));
901
}
656
902
if(ret < 0){
657
perror("asprintf");
903
error(0, errno, "asprintf");
658
904
continue;
659
905
}
660
906
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
907
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
908
if(ret == -1){
909
error(0, errno, "stat");
664
910
free(filename);
665
911
continue;
666
912
}
667
913
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
914
/* Ignore non-executable files */
915
if(not S_ISREG(st.st_mode)
916
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
669
917
if(debug){
670
918
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
919
" with bad type or mode\n", filename);
673
921
free(filename);
674
922
continue;
675
923
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
924
925
plugin *p = getplugin(dirst->d_name);
677
926
if(p == NULL){
678
perror("getplugin");
927
error(0, errno, "getplugin");
679
928
free(filename);
680
929
continue;
681
930
}
689
938
}
690
939
{
691
940
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
941
plugin *g = getplugin(NULL);
693
942
if(g != NULL){
694
943
for(char **a = g->argv + 1; *a != NULL; a++){
695
944
if(not add_argument(p, *a)){
696
perror("add_argument");
945
error(0, errno, "add_argument");
697
946
}
698
947
}
699
948
/* Add global environment variables */
700
949
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
950
if(not add_environment(p, *e, false)){
951
error(0, errno, "add_environment");
703
952
}
704
953
}
705
954
}
709
958
process, too. */
710
959
if(p->environ[0] != NULL){
711
960
for(char **e = environ; *e != NULL; e++){
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");
961
if(not add_environment(p, *e, false)){
962
error(0, errno, "add_environment");
719
963
}
720
964
}
721
965
}
722
966
723
967
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
968
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
969
if(ret == -1){
970
error(0, errno, "pipe");
971
exitstatus = EX_OSERR;
728
972
goto fallback;
729
973
}
974
/* Ask OS to automatic close the pipe on exec */
730
975
ret = set_cloexec_flag(pipefd[0]);
731
976
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
734
979
goto fallback;
735
980
}
736
981
ret = set_cloexec_flag(pipefd[1]);
737
982
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
983
error(0, errno, "set_cloexec_flag");
984
exitstatus = EX_OSERR;
740
985
goto fallback;
741
986
}
742
987
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
989
&sigchld_action.sa_mask,
990
NULL));
744
991
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
992
error(0, errno, "sigprocmask");
993
exitstatus = EX_OSERR;
747
994
goto fallback;
748
995
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
996
/* Starting a new process to be watched */
997
pid_t pid;
998
do {
999
pid = fork();
1000
} while(pid == -1 and errno == EINTR);
751
1001
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
1002
error(0, errno, "fork");
1003
exitstatus = EX_OSERR;
754
1004
goto fallback;
755
1005
}
756
1006
if(pid == 0){
757
1007
/* this is the child process */
758
1008
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
1009
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1010
error(0, errno, "sigaction");
1011
_exit(EX_OSERR);
762
1012
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1013
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
1014
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1015
error(0, errno, "sigprocmask");
1016
_exit(EX_OSERR);
767
1017
}
768
1018
769
1019
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
1020
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1021
error(0, errno, "dup2");
1022
_exit(EX_OSERR);
773
1023
}
774
1024
775
1025
if(dirfd(dir) < 0){
779
1029
}
780
1030
if(p->environ[0] == NULL){
781
1031
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
1032
error(0, errno, "execv for %s", filename);
1033
_exit(EX_OSERR);
784
1034
}
785
1035
} else {
786
1036
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
1037
error(0, errno, "execve for %s", filename);
1038
_exit(EX_OSERR);
789
1039
}
790
1040
}
791
1041
/* no return */
792
1042
}
793
/* parent process */
1043
/* Parent process */
1044
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1045
pipe */
794
1046
free(filename);
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);
1047
plugin *new_plugin = getplugin(dirst->d_name);
1048
if(new_plugin == NULL){
1049
error(0, errno, "getplugin");
1050
ret = (int)(TEMP_FAILURE_RETRY
1051
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1052
NULL)));
800
1053
if(ret < 0){
801
perror("sigprocmask");
1054
error(0, errno, "sigprocmask");
802
1055
}
803
exitstatus = EXIT_FAILURE;
1056
exitstatus = EX_OSERR;
804
1057
goto fallback;
805
1058
}
806
1059
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1060
new_plugin->pid = pid;
1061
new_plugin->fd = pipefd[0];
1062
812
1063
/* Unblock SIGCHLD so signal handler can be run if this process
813
1064
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1065
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1066
&sigchld_action.sa_mask,
1067
NULL));
815
1068
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1069
error(0, errno, "sigprocmask");
1070
exitstatus = EX_OSERR;
818
1071
goto fallback;
819
1072
}
820
1073
821
FD_SET(new_process->fd, &rfds_all);
1074
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1075
-Wconversion */
822
1076
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1077
if(maxfd < new_plugin->fd){
1078
maxfd = new_plugin->fd;
825
1079
}
826
827
1080
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
1081
832
closedir(dir);
1082
TEMP_FAILURE_RETRY(closedir(dir));
833
1083
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1084
free_plugin(getplugin(NULL));
1085
1086
for(plugin *p = plugin_list; p != NULL; p = p->next){
1087
if(p->pid != 0){
1088
break;
1089
}
1090
if(p->next == NULL){
1091
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1092
" directory?\n");
1093
free_plugin_list();
1094
}
839
1095
}
840
while(process_list){
1096
1097
/* Main loop while running plugins exist */
1098
while(plugin_list){
841
1099
fd_set rfds = rfds_all;
842
1100
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1101
if(select_ret == -1 and errno != EINTR){
1102
error(0, errno, "select");
1103
exitstatus = EX_OSERR;
846
1104
goto fallback;
847
1105
}
848
1106
/* OK, now either a process completed, or something can be read
849
1107
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1108
for(plugin *proc = plugin_list; proc != NULL;){
851
1109
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1110
if(proc->completed and proc->eof){
853
1111
/* Only accept the plugin output if it exited cleanly */
854
1112
if(not WIFEXITED(proc->status)
855
1113
or WEXITSTATUS(proc->status) != 0){
856
1114
/* Bad exit by plugin */
1115
857
1116
if(debug){
858
1117
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1118
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1119
" status %d\n", proc->name,
1120
(intmax_t) (proc->pid),
861
1121
WEXITSTATUS(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));
1122
} else if(WIFSIGNALED(proc->status)){
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1124
" signal %d: %s\n", proc->name,
1125
(intmax_t) (proc->pid),
1126
WTERMSIG(proc->status),
1127
strsignal(WTERMSIG(proc->status)));
866
1128
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1129
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1130
" core\n", proc->name, (intmax_t) (proc->pid));
869
1131
}
870
1132
}
1133
871
1134
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
1135
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1136
-Wconversion */
1137
873
1138
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1139
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1140
(SIG_BLOCK,
1141
&sigchld_action.sa_mask,
1142
NULL));
875
1143
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1144
error(0, errno, "sigprocmask");
1145
exitstatus = EX_OSERR;
878
1146
goto fallback;
879
1147
}
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
}
1148
1149
plugin *next_plugin = proc->next;
1150
free_plugin(proc);
1151
proc = next_plugin;
1152
893
1153
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1154
ret = (int)(TEMP_FAILURE_RETRY
1155
(sigprocmask(SIG_UNBLOCK,
1156
&sigchld_action.sa_mask, NULL)));
896
1157
if(ret < 0){
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;
1158
error(0, errno, "sigprocmask");
1159
exitstatus = EX_OSERR;
1160
goto fallback;
1161
}
1162
1163
if(plugin_list == NULL){
1164
break;
1165
}
1166
1167
continue;
905
1168
}
1169
906
1170
/* This process exited nicely, so print its buffer */
907
1171
908
1172
bool bret = print_out_password(proc->buffer,
909
1173
proc->buffer_length);
910
1174
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1175
error(0, errno, "print_out_password");
1176
exitstatus = EX_IOERR;
913
1177
}
914
1178
goto fallback;
915
1179
}
1180
916
1181
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1182
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1183
warning from
1184
-Wconversion */
918
1185
/* This process had nothing to say at this time */
1186
proc = proc->next;
919
1187
continue;
920
1188
}
921
1189
/* Before reading, make the process' data buffer large enough */
922
1190
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1191
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1192
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1193
if(proc->buffer == NULL){
1194
error(0, errno, "malloc");
1195
exitstatus = EX_OSERR;
928
1196
goto fallback;
929
1197
}
930
1198
proc->buffer_size += BUFFER_SIZE;
931
1199
}
932
1200
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1201
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1202
proc->buffer
1203
+ proc->buffer_length,
1204
BUFFER_SIZE));
1205
if(sret < 0){
936
1206
/* Read error from this process; ignore the error */
1207
proc = proc->next;
937
1208
continue;
938
1209
}
939
if(ret == 0){
1210
if(sret == 0){
940
1211
/* got EOF */
941
1212
proc->eof = true;
942
1213
} else {
943
proc->buffer_length += (size_t) ret;
1214
proc->buffer_length += (size_t) sret;
944
1215
}
945
1216
}
946
1217
}
947
948
1218
1219
949
1220
fallback:
950
1221
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1222
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1223
and exitstatus != EX_OK)){
952
1224
/* Fallback if all plugins failed, none are found or an error
953
1225
occured */
954
1226
bool bret;
955
1227
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1228
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1229
size_t len = strlen(passwordbuffer);
1230
/* Strip trailing newline */
1231
if(len > 0 and passwordbuffer[len-1] == '\n'){
1232
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1233
len--;
1234
}
1235
bret = print_out_password(passwordbuffer, len);
958
1236
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1237
error(0, errno, "print_out_password");
1238
exitstatus = EX_IOERR;
961
1239
}
962
1240
}
963
1241
964
1242
/* Restore old signal handler */
965
1243
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1244
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1245
error(0, errno, "sigaction");
1246
exitstatus = EX_OSERR;
969
1247
}
970
1248
971
1249
if(custom_argv != NULL){
972
1250
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1251
free(*arg);
974
1252
}
975
1253
free(custom_argv);
976
1254
}
977
free_plugin_list(plugin_list);
978
1255
979
1256
if(dir != NULL){
980
1257
closedir(dir);
981
1258
}
982
1259
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");
1260
/* Kill the processes */
1261
for(plugin *p = plugin_list; p != NULL; p = p->next){
1262
if(p->pid != 0){
1263
close(p->fd);
1264
ret = kill(p->pid, SIGTERM);
1265
if(ret == -1 and errno != ESRCH){
1266
/* Set-uid proccesses might not get closed */
1267
error(0, errno, "kill");
1268
}
991
1269
}
992
free(process_list->buffer);
993
free(process_list);
994
1270
}
995
1271
996
1272
/* Wait for any remaining child processes to terminate */
997
do{
1273
do {
998
1274
ret = wait(NULL);
999
1275
} while(ret >= 0);
1000
1276
if(errno != ECHILD){
1001
perror("wait");
1277
error(0, errno, "wait");
1002
1278
}
1003
1279
1280
free_plugin_list();
1281
1004
1282
free(plugindir);
1005
1283
free(argfile);
1006
1284
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0