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- Committer: Björn Påhlsson
- Date: 2011-11-24 19:27:53 UTC
- mto: (518.2.5 persistent-state-gpgme)
- mto: This revision was merged to the branch mainline in revision 524.
- Revision ID: belorn@fukt.bsnet.se-20111124192753-y5jxlc1h3tcxpubc
First run of python-lint. Fixed some *obviously* bad code and turned
them into good code.
them into good code.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 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
148
174
static bool add_to_char_array(const char *new, char ***array,
149
175
int *len){
150
176
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
177
do {
178
*array = realloc(*array, sizeof(char *)
179
* (size_t) ((*len) + 2));
180
} while(*array == NULL and errno == EINTR);
153
181
/* Malloc check */
154
182
if(*array == NULL){
155
183
return false;
156
184
}
157
185
/* Make a copy of the new string */
158
char *copy = strdup(new);
186
char *copy;
187
do {
188
copy = strdup(new);
189
} while(copy == NULL and errno == EINTR);
159
190
if(copy == NULL){
160
191
return false;
161
192
}
176
207
}
177
208
178
209
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
210
static bool add_environment(plugin *p, const char *def, bool replace){
180
211
if(p == NULL){
181
212
return false;
182
213
}
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
}
183
234
return add_to_char_array(def, &(p->environ), &(p->envc));
184
235
}
185
236
186
187
237
/*
188
238
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
239
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
240
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
241
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
242
static int set_cloexec_flag(int fd){
243
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
195
244
/* If reading the flags failed, return error indication now. */
196
245
if(ret < 0){
197
246
return ret;
198
247
}
199
248
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
249
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
250
ret | FD_CLOEXEC));
201
251
}
202
252
203
process *process_list = NULL;
204
253
205
254
/* Mark processes as completed when they exit, and save their exit
206
255
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
256
static void handle_sigchld(__attribute__((unused)) int sig){
257
int old_errno = errno;
208
258
while(true){
209
process *proc = process_list;
259
plugin *proc = plugin_list;
210
260
int status;
211
261
pid_t pid = waitpid(-1, &status, WNOHANG);
212
262
if(pid == 0){
214
264
break;
215
265
}
216
266
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
267
if(errno == ECHILD){
268
/* No child processes */
269
break;
219
270
}
220
/* No child processes */
221
break;
271
error(0, errno, "waitpid");
222
272
}
223
273
224
274
/* A child exited, find it in process_list */
225
275
while(proc != NULL and proc->pid != pid){
226
276
proc = proc->next;
230
280
continue;
231
281
}
232
282
proc->status = status;
233
proc->completed = true;
283
proc->completed = 1;
234
284
}
285
errno = old_errno;
235
286
}
236
287
237
bool print_out_password(const char *buffer, size_t length){
288
/* Prints out a password to stdout */
289
static bool print_out_password(const char *buffer, size_t length){
238
290
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
291
for(size_t written = 0; written < length; written += (size_t)ret){
243
292
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
293
length - written));
249
298
return true;
250
299
}
251
300
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);
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);
264
334
}
265
335
}
266
336
274
344
struct stat st;
275
345
fd_set rfds_all;
276
346
int ret, maxfd = 0;
347
ssize_t sret;
277
348
uid_t uid = 65534;
278
349
gid_t gid = 65534;
279
350
bool debug = false;
288
359
sigemptyset(&sigchld_action.sa_mask);
289
360
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
290
361
if(ret == -1){
291
perror("sigaddset");
292
exitstatus = EXIT_FAILURE;
362
error(0, errno, "sigaddset");
363
exitstatus = EX_OSERR;
293
364
goto fallback;
294
365
}
295
366
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
296
367
if(ret == -1){
297
perror("sigaction");
298
exitstatus = EXIT_FAILURE;
368
error(0, errno, "sigaction");
369
exitstatus = EX_OSERR;
299
370
goto fallback;
300
371
}
301
372
304
375
{ .name = "global-options", .key = 'g',
305
376
.arg = "OPTION[,OPTION[,...]]",
306
377
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
378
{ .name = "global-env", .key = 'G',
308
379
.arg = "VAR=value",
309
380
.doc = "Environment variable passed to all plugins" },
310
381
{ .name = "options-for", .key = 'o',
311
382
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
383
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
384
{ .name = "env-for", .key = 'E',
314
385
.arg = "PLUGIN:ENV=value",
315
386
.doc = "Environment variable passed to specified plugin" },
316
387
{ .name = "disable", .key = 'd',
317
388
.arg = "PLUGIN",
318
389
.doc = "Disable a specific plugin", .group = 1 },
390
{ .name = "enable", .key = 'e',
391
.arg = "PLUGIN",
392
.doc = "Enable a specific plugin", .group = 1 },
319
393
{ .name = "plugin-dir", .key = 128,
320
394
.arg = "DIRECTORY",
321
395
.doc = "Specify a different plugin directory", .group = 2 },
330
404
.doc = "Group ID the plugins will run as", .group = 3 },
331
405
{ .name = "debug", .key = 132,
332
406
.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 },
333
416
{ .name = NULL }
334
417
};
335
418
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
}
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 */
397
461
{
398
462
char *envdef = strchr(arg, ':');
399
463
if(envdef == NULL){
400
break;
401
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
464
argp_error(state, "No colon in \"%s\"", arg);
465
errno = EINVAL;
466
break;
467
}
468
*envdef = '\0';
406
469
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:
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);
422
496
plugindir = strdup(arg);
423
if(plugindir == NULL){
424
perror("strdup");
425
}
426
break;
427
case 129:
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 */
522
debug = true;
523
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);
428
572
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;
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 */
442
580
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
case ARGP_KEY_END:
446
581
break;
447
582
default:
448
583
return ARGP_ERR_UNKNOWN;
449
584
}
450
return 0;
585
return errno;
451
586
}
452
587
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
588
struct argp argp = { .options = options,
589
.parser = parse_opt_config_file,
590
.args_doc = "",
457
591
.doc = "Mandos plugin runner -- Run plugins" };
458
592
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;
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;
463
609
goto fallback;
464
610
}
465
466
if (argfile == NULL){
611
612
/* Reset to the normal argument parser */
613
argp.parser = parse_opt;
614
615
/* Open the configfile if available */
616
if(argfile == NULL){
467
617
conffp = fopen(AFILE, "r");
468
618
} else {
469
619
conffp = fopen(argfile, "r");
470
620
}
471
472
621
if(conffp != NULL){
473
622
char *org_line = NULL;
474
623
char *p, *arg, *new_arg, *line;
475
624
size_t size = 0;
476
ssize_t sret;
477
625
const char whitespace_delims[] = " \r\t\f\v\n";
478
626
const char comment_delim[] = "#";
479
627
480
628
custom_argc = 1;
481
629
custom_argv = malloc(sizeof(char*) * 2);
482
630
if(custom_argv == NULL){
483
perror("malloc");
484
exitstatus = EXIT_FAILURE;
631
error(0, errno, "malloc");
632
exitstatus = EX_OSERR;
485
633
goto fallback;
486
634
}
487
635
custom_argv[0] = argv[0];
488
636
custom_argv[1] = NULL;
489
637
638
/* for each line in the config file, strip whitespace and ignore
639
commented text */
490
640
while(true){
491
641
sret = getline(&org_line, &size, conffp);
492
642
if(sret == -1){
493
643
break;
494
644
}
495
645
496
646
line = org_line;
497
647
arg = strsep(&line, comment_delim);
498
648
while((p = strsep(&arg, whitespace_delims)) != NULL){
501
651
}
502
652
new_arg = strdup(p);
503
653
if(new_arg == NULL){
504
perror("strdup");
505
exitstatus = EXIT_FAILURE;
654
error(0, errno, "strdup");
655
exitstatus = EX_OSERR;
506
656
free(org_line);
507
657
goto fallback;
508
658
}
511
661
custom_argv = realloc(custom_argv, sizeof(char *)
512
662
* ((unsigned int) custom_argc + 1));
513
663
if(custom_argv == NULL){
514
perror("realloc");
515
exitstatus = EXIT_FAILURE;
664
error(0, errno, "realloc");
665
exitstatus = EX_OSERR;
516
666
free(org_line);
517
667
goto fallback;
518
668
}
519
669
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
670
custom_argv[custom_argc] = NULL;
521
671
}
522
672
}
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
}
523
681
free(org_line);
524
} else{
682
} else {
525
683
/* Check for harmful errors and go to fallback. Other errors might
526
684
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
perror("fopen");
529
exitstatus = EXIT_FAILURE;
685
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
686
error(0, errno, "fopen");
687
exitstatus = EX_OSERR;
530
688
goto fallback;
531
689
}
532
690
}
533
691
/* If there were any arguments from the configuration file, pass
692
them to parser as command line arguments */
534
693
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;
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;
539
708
goto fallback;
540
709
}
541
710
}
542
711
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
543
731
if(debug){
544
732
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
733
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
735
for(char **a = p->argv; *a != NULL; a++){
548
736
fprintf(stderr, "\tArg: %s\n", *a);
549
737
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
738
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
739
for(char **a = p->environ; *a != NULL; a++){
552
740
fprintf(stderr, "\t%s\n", *a);
553
741
}
554
742
}
555
743
}
556
744
745
{
746
/* Work around Debian bug #633582:
747
<http://bugs.debian.org/633582> */
748
int plugindir_fd = open(/* plugindir or */ PDIR, O_RDONLY);
749
if(plugindir_fd == -1){
750
error(0, errno, "open");
751
} else {
752
ret = (int)TEMP_FAILURE_RETRY(fstat(plugindir_fd, &st));
753
if(ret == -1){
754
error(0, errno, "fstat");
755
} else {
756
if(S_ISDIR(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
757
ret = fchown(plugindir_fd, uid, gid);
758
if(ret == -1){
759
error(0, errno, "fchown");
760
}
761
}
762
}
763
TEMP_FAILURE_RETRY(close(plugindir_fd));
764
}
765
}
766
767
/* Lower permissions */
768
setgid(gid);
769
if(ret == -1){
770
error(0, errno, "setgid");
771
}
557
772
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 */
773
if(ret == -1){
774
error(0, errno, "setuid");
775
}
776
777
/* Open plugin directory with close_on_exec flag */
580
778
{
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
}
779
int dir_fd = -1;
780
if(plugindir == NULL){
781
dir_fd = open(PDIR, O_RDONLY |
782
#ifdef O_CLOEXEC
783
O_CLOEXEC
784
#else /* not O_CLOEXEC */
785
0
786
#endif /* not O_CLOEXEC */
787
);
788
} else {
789
dir_fd = open(plugindir, O_RDONLY |
790
#ifdef O_CLOEXEC
791
O_CLOEXEC
792
#else /* not O_CLOEXEC */
793
0
794
#endif /* not O_CLOEXEC */
795
);
796
}
797
if(dir_fd == -1){
798
error(0, errno, "Could not open plugin dir");
799
exitstatus = EX_UNAVAILABLE;
800
goto fallback;
801
}
802
803
#ifndef O_CLOEXEC
804
/* Set the FD_CLOEXEC flag on the directory */
805
ret = set_cloexec_flag(dir_fd);
806
if(ret < 0){
807
error(0, errno, "set_cloexec_flag");
808
TEMP_FAILURE_RETRY(close(dir_fd));
809
exitstatus = EX_OSERR;
810
goto fallback;
811
}
812
#endif /* O_CLOEXEC */
813
814
dir = fdopendir(dir_fd);
815
if(dir == NULL){
816
error(0, errno, "Could not open plugin dir");
817
TEMP_FAILURE_RETRY(close(dir_fd));
818
exitstatus = EX_OSERR;
819
goto fallback;
589
820
}
590
821
}
591
822
592
823
FD_ZERO(&rfds_all);
593
824
825
/* Read and execute any executable in the plugin directory*/
594
826
while(true){
595
dirst = readdir(dir);
827
do {
828
dirst = readdir(dir);
829
} while(dirst == NULL and errno == EINTR);
596
830
597
// All directory entries have been processed
831
/* All directory entries have been processed */
598
832
if(dirst == NULL){
599
if (errno == EBADF){
600
perror("readdir");
601
exitstatus = EXIT_FAILURE;
833
if(errno == EBADF){
834
error(0, errno, "readdir");
835
exitstatus = EX_IOERR;
602
836
goto fallback;
603
837
}
604
838
break;
606
840
607
841
d_name_len = strlen(dirst->d_name);
608
842
609
// Ignore dotfiles, backup files and other junk
843
/* Ignore dotfiles, backup files and other junk */
610
844
{
611
845
bool bad_name = false;
612
846
614
848
615
849
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
850
".dpkg-old",
851
".dpkg-bak",
617
852
".dpkg-divert", NULL };
618
853
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
854
size_t pre_len = strlen(*pre);
627
862
break;
628
863
}
629
864
}
630
631
865
if(bad_name){
632
866
continue;
633
867
}
634
635
868
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
869
size_t suf_len = strlen(*suf);
637
870
if((d_name_len >= suf_len)
638
and (strcmp((dirst->d_name)+d_name_len-suf_len, *suf)
871
and (strcmp((dirst->d_name) + d_name_len-suf_len, *suf)
639
872
== 0)){
640
873
if(debug){
641
874
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
650
883
continue;
651
884
}
652
885
}
653
886
654
887
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
888
if(plugindir == NULL){
889
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
890
dirst->d_name));
891
} else {
892
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
893
plugindir,
894
dirst->d_name));
895
}
656
896
if(ret < 0){
657
perror("asprintf");
897
error(0, errno, "asprintf");
658
898
continue;
659
899
}
660
900
661
ret = stat(filename, &st);
662
if (ret == -1){
663
perror("stat");
901
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
902
if(ret == -1){
903
error(0, errno, "stat");
664
904
free(filename);
665
905
continue;
666
906
}
667
907
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
908
/* Ignore non-executable files */
909
if(not S_ISREG(st.st_mode)
910
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
669
911
if(debug){
670
912
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
913
" with bad type or mode\n", filename);
673
915
free(filename);
674
916
continue;
675
917
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
918
919
plugin *p = getplugin(dirst->d_name);
677
920
if(p == NULL){
678
perror("getplugin");
921
error(0, errno, "getplugin");
679
922
free(filename);
680
923
continue;
681
924
}
689
932
}
690
933
{
691
934
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
935
plugin *g = getplugin(NULL);
693
936
if(g != NULL){
694
937
for(char **a = g->argv + 1; *a != NULL; a++){
695
938
if(not add_argument(p, *a)){
696
perror("add_argument");
939
error(0, errno, "add_argument");
697
940
}
698
941
}
699
942
/* Add global environment variables */
700
943
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
702
perror("add_environment");
944
if(not add_environment(p, *e, false)){
945
error(0, errno, "add_environment");
703
946
}
704
947
}
705
948
}
709
952
process, too. */
710
953
if(p->environ[0] != NULL){
711
954
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");
955
if(not add_environment(p, *e, false)){
956
error(0, errno, "add_environment");
719
957
}
720
958
}
721
959
}
722
960
723
961
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
726
perror("pipe");
727
exitstatus = EXIT_FAILURE;
962
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
963
if(ret == -1){
964
error(0, errno, "pipe");
965
exitstatus = EX_OSERR;
728
966
goto fallback;
729
967
}
968
/* Ask OS to automatic close the pipe on exec */
730
969
ret = set_cloexec_flag(pipefd[0]);
731
970
if(ret < 0){
732
perror("set_cloexec_flag");
733
exitstatus = EXIT_FAILURE;
971
error(0, errno, "set_cloexec_flag");
972
exitstatus = EX_OSERR;
734
973
goto fallback;
735
974
}
736
975
ret = set_cloexec_flag(pipefd[1]);
737
976
if(ret < 0){
738
perror("set_cloexec_flag");
739
exitstatus = EXIT_FAILURE;
977
error(0, errno, "set_cloexec_flag");
978
exitstatus = EX_OSERR;
740
979
goto fallback;
741
980
}
742
981
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
982
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
983
&sigchld_action.sa_mask,
984
NULL));
744
985
if(ret < 0){
745
perror("sigprocmask");
746
exitstatus = EXIT_FAILURE;
986
error(0, errno, "sigprocmask");
987
exitstatus = EX_OSERR;
747
988
goto fallback;
748
989
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
990
/* Starting a new process to be watched */
991
pid_t pid;
992
do {
993
pid = fork();
994
} while(pid == -1 and errno == EINTR);
751
995
if(pid == -1){
752
perror("fork");
753
exitstatus = EXIT_FAILURE;
996
error(0, errno, "fork");
997
exitstatus = EX_OSERR;
754
998
goto fallback;
755
999
}
756
1000
if(pid == 0){
757
1001
/* this is the child process */
758
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
759
1003
if(ret < 0){
760
perror("sigaction");
761
_exit(EXIT_FAILURE);
1004
error(0, errno, "sigaction");
1005
_exit(EX_OSERR);
762
1006
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1007
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
1008
if(ret < 0){
765
perror("sigprocmask");
766
_exit(EXIT_FAILURE);
1009
error(0, errno, "sigprocmask");
1010
_exit(EX_OSERR);
767
1011
}
768
1012
769
1013
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
1014
if(ret == -1){
771
perror("dup2");
772
_exit(EXIT_FAILURE);
1015
error(0, errno, "dup2");
1016
_exit(EX_OSERR);
773
1017
}
774
1018
775
1019
if(dirfd(dir) < 0){
779
1023
}
780
1024
if(p->environ[0] == NULL){
781
1025
if(execv(filename, p->argv) < 0){
782
perror("execv");
783
_exit(EXIT_FAILURE);
1026
error(0, errno, "execv for %s", filename);
1027
_exit(EX_OSERR);
784
1028
}
785
1029
} else {
786
1030
if(execve(filename, p->argv, p->environ) < 0){
787
perror("execve");
788
_exit(EXIT_FAILURE);
1031
error(0, errno, "execve for %s", filename);
1032
_exit(EX_OSERR);
789
1033
}
790
1034
}
791
1035
/* no return */
792
1036
}
793
/* parent process */
1037
/* Parent process */
1038
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
1039
pipe */
794
1040
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);
1041
plugin *new_plugin = getplugin(dirst->d_name);
1042
if(new_plugin == NULL){
1043
error(0, errno, "getplugin");
1044
ret = (int)(TEMP_FAILURE_RETRY
1045
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1046
NULL)));
800
1047
if(ret < 0){
801
perror("sigprocmask");
1048
error(0, errno, "sigprocmask");
802
1049
}
803
exitstatus = EXIT_FAILURE;
1050
exitstatus = EX_OSERR;
804
1051
goto fallback;
805
1052
}
806
1053
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
1054
new_plugin->pid = pid;
1055
new_plugin->fd = pipefd[0];
1056
812
1057
/* Unblock SIGCHLD so signal handler can be run if this process
813
1058
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
1059
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
1060
&sigchld_action.sa_mask,
1061
NULL));
815
1062
if(ret < 0){
816
perror("sigprocmask");
817
exitstatus = EXIT_FAILURE;
1063
error(0, errno, "sigprocmask");
1064
exitstatus = EX_OSERR;
818
1065
goto fallback;
819
1066
}
820
1067
821
FD_SET(new_process->fd, &rfds_all);
1068
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
1069
-Wconversion */
822
1070
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
1071
if(maxfd < new_plugin->fd){
1072
maxfd = new_plugin->fd;
825
1073
}
826
827
1074
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
1075
832
closedir(dir);
1076
TEMP_FAILURE_RETRY(closedir(dir));
833
1077
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
1078
free_plugin(getplugin(NULL));
1079
1080
for(plugin *p = plugin_list; p != NULL; p = p->next){
1081
if(p->pid != 0){
1082
break;
1083
}
1084
if(p->next == NULL){
1085
fprintf(stderr, "No plugin processes started. Incorrect plugin"
1086
" directory?\n");
1087
free_plugin_list();
1088
}
839
1089
}
840
while(process_list){
1090
1091
/* Main loop while running plugins exist */
1092
while(plugin_list){
841
1093
fd_set rfds = rfds_all;
842
1094
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
844
perror("select");
845
exitstatus = EXIT_FAILURE;
1095
if(select_ret == -1 and errno != EINTR){
1096
error(0, errno, "select");
1097
exitstatus = EX_OSERR;
846
1098
goto fallback;
847
1099
}
848
1100
/* OK, now either a process completed, or something can be read
849
1101
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1102
for(plugin *proc = plugin_list; proc != NULL;){
851
1103
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1104
if(proc->completed and proc->eof){
853
1105
/* Only accept the plugin output if it exited cleanly */
854
1106
if(not WIFEXITED(proc->status)
855
1107
or WEXITSTATUS(proc->status) != 0){
856
1108
/* Bad exit by plugin */
1109
857
1110
if(debug){
858
1111
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1112
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1113
" status %d\n", proc->name,
1114
(intmax_t) (proc->pid),
861
1115
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));
1116
} else if(WIFSIGNALED(proc->status)){
1117
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1118
" signal %d: %s\n", proc->name,
1119
(intmax_t) (proc->pid),
1120
WTERMSIG(proc->status),
1121
strsignal(WTERMSIG(proc->status)));
866
1122
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1123
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1124
" core\n", proc->name, (intmax_t) (proc->pid));
869
1125
}
870
1126
}
1127
871
1128
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
1129
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1130
-Wconversion */
1131
873
1132
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1133
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1134
(SIG_BLOCK,
1135
&sigchld_action.sa_mask,
1136
NULL));
875
1137
if(ret < 0){
876
perror("sigprocmask");
877
exitstatus = EXIT_FAILURE;
1138
error(0, errno, "sigprocmask");
1139
exitstatus = EX_OSERR;
878
1140
goto fallback;
879
1141
}
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
}
1142
1143
plugin *next_plugin = proc->next;
1144
free_plugin(proc);
1145
proc = next_plugin;
1146
893
1147
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1148
ret = (int)(TEMP_FAILURE_RETRY
1149
(sigprocmask(SIG_UNBLOCK,
1150
&sigchld_action.sa_mask, NULL)));
896
1151
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;
1152
error(0, errno, "sigprocmask");
1153
exitstatus = EX_OSERR;
1154
goto fallback;
1155
}
1156
1157
if(plugin_list == NULL){
1158
break;
1159
}
1160
1161
continue;
905
1162
}
1163
906
1164
/* This process exited nicely, so print its buffer */
907
1165
908
1166
bool bret = print_out_password(proc->buffer,
909
1167
proc->buffer_length);
910
1168
if(not bret){
911
perror("print_out_password");
912
exitstatus = EXIT_FAILURE;
1169
error(0, errno, "print_out_password");
1170
exitstatus = EX_IOERR;
913
1171
}
914
1172
goto fallback;
915
1173
}
1174
916
1175
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1176
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1177
warning from
1178
-Wconversion */
918
1179
/* This process had nothing to say at this time */
1180
proc = proc->next;
919
1181
continue;
920
1182
}
921
1183
/* Before reading, make the process' data buffer large enough */
922
1184
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1185
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1186
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
926
perror("malloc");
927
exitstatus = EXIT_FAILURE;
1187
if(proc->buffer == NULL){
1188
error(0, errno, "malloc");
1189
exitstatus = EX_OSERR;
928
1190
goto fallback;
929
1191
}
930
1192
proc->buffer_size += BUFFER_SIZE;
931
1193
}
932
1194
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1195
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1196
proc->buffer
1197
+ proc->buffer_length,
1198
BUFFER_SIZE));
1199
if(sret < 0){
936
1200
/* Read error from this process; ignore the error */
1201
proc = proc->next;
937
1202
continue;
938
1203
}
939
if(ret == 0){
1204
if(sret == 0){
940
1205
/* got EOF */
941
1206
proc->eof = true;
942
1207
} else {
943
proc->buffer_length += (size_t) ret;
1208
proc->buffer_length += (size_t) sret;
944
1209
}
945
1210
}
946
1211
}
947
948
1212
1213
949
1214
fallback:
950
1215
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1216
if(plugin_list == NULL or (exitstatus != EXIT_SUCCESS
1217
and exitstatus != EX_OK)){
952
1218
/* Fallback if all plugins failed, none are found or an error
953
1219
occured */
954
1220
bool bret;
955
1221
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1222
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1223
size_t len = strlen(passwordbuffer);
1224
/* Strip trailing newline */
1225
if(len > 0 and passwordbuffer[len-1] == '\n'){
1226
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1227
len--;
1228
}
1229
bret = print_out_password(passwordbuffer, len);
958
1230
if(not bret){
959
perror("print_out_password");
960
exitstatus = EXIT_FAILURE;
1231
error(0, errno, "print_out_password");
1232
exitstatus = EX_IOERR;
961
1233
}
962
1234
}
963
1235
964
1236
/* Restore old signal handler */
965
1237
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
966
1238
if(ret == -1){
967
perror("sigaction");
968
exitstatus = EXIT_FAILURE;
1239
error(0, errno, "sigaction");
1240
exitstatus = EX_OSERR;
969
1241
}
970
1242
971
1243
if(custom_argv != NULL){
972
1244
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1245
free(*arg);
974
1246
}
975
1247
free(custom_argv);
976
1248
}
977
free_plugin_list(plugin_list);
978
1249
979
1250
if(dir != NULL){
980
1251
closedir(dir);
981
1252
}
982
1253
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");
1254
/* Kill the processes */
1255
for(plugin *p = plugin_list; p != NULL; p = p->next){
1256
if(p->pid != 0){
1257
close(p->fd);
1258
ret = kill(p->pid, SIGTERM);
1259
if(ret == -1 and errno != ESRCH){
1260
/* Set-uid proccesses might not get closed */
1261
error(0, errno, "kill");
1262
}
991
1263
}
992
free(process_list->buffer);
993
free(process_list);
994
1264
}
995
1265
996
1266
/* Wait for any remaining child processes to terminate */
997
do{
1267
do {
998
1268
ret = wait(NULL);
999
1269
} while(ret >= 0);
1000
1270
if(errno != ECHILD){
1001
perror("wait");
1271
error(0, errno, "wait");
1002
1272
}
1003
1273
1274
free_plugin_list();
1275
1004
1276
free(plugindir);
1005
1277
free(argfile);
1006
1278
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0