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- Committer: Teddy Hogeborn
- Date: 2009-09-22 20:18:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20090922201843-cd5uqnthf3eegg4l
* mandos (Client.start_checker): Bug fix: Fix race condition with
short intervals.
short intervals.
- files added:
- .bzr-builddeb
- debian
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
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
45
#include <dirent.h> /* DIR, struct dirent, opendir(),
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() */
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() */
66
71
67
72
#define BUFFER_SIZE 256
68
73
69
74
#define PDIR "/lib/mandos/plugins.d"
70
75
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
76
72
const char *argp_program_version = "plugin-runner 1.0";
77
const char *argp_program_version = "plugin-runner " VERSION;
73
78
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
79
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
89
80
typedef struct plugin{
90
81
char *name; /* can be NULL or any plugin name */
91
82
char **argv;
93
84
char **environ;
94
85
int envc;
95
86
bool disabled;
87
88
/* Variables used for running processes*/
89
pid_t pid;
90
int fd;
91
char *buffer;
92
size_t buffer_size;
93
size_t buffer_length;
94
bool eof;
95
volatile sig_atomic_t completed;
96
int status;
96
97
struct plugin *next;
97
98
} plugin;
98
99
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))){
100
static plugin *plugin_list = NULL;
101
102
/* Gets an existing plugin based on name,
103
or if none is found, creates a new one */
104
static plugin *getplugin(char *name){
105
/* Check for exiting plugin with that name */
106
for(plugin *p = plugin_list; p != NULL; p = p->next){
107
if((p->name == name)
108
or (p->name and name and (strcmp(p->name, name) == 0))){
103
109
return p;
104
110
}
105
111
}
106
112
/* Create a new plugin */
107
plugin *new_plugin = malloc(sizeof(plugin));
108
if (new_plugin == NULL){
113
plugin *new_plugin = NULL;
114
do {
115
new_plugin = malloc(sizeof(plugin));
116
} while(new_plugin == NULL and errno == EINTR);
117
if(new_plugin == NULL){
109
118
return NULL;
110
119
}
111
120
char *copy_name = NULL;
112
121
if(name != NULL){
113
copy_name = strdup(name);
122
do {
123
copy_name = strdup(name);
124
} while(copy_name == NULL and errno == EINTR);
114
125
if(copy_name == NULL){
126
free(new_plugin);
115
127
return NULL;
116
128
}
117
129
}
118
130
119
*new_plugin = (plugin) { .name = copy_name,
120
.argc = 1,
121
.envc = 0,
122
.disabled = false,
123
.next = *plugin_list };
131
*new_plugin = (plugin){ .name = copy_name,
132
.argc = 1,
133
.disabled = false,
134
.next = plugin_list };
124
135
125
new_plugin->argv = malloc(sizeof(char *) * 2);
126
if (new_plugin->argv == NULL){
136
do {
137
new_plugin->argv = malloc(sizeof(char *) * 2);
138
} while(new_plugin->argv == NULL and errno == EINTR);
139
if(new_plugin->argv == NULL){
127
140
free(copy_name);
128
141
free(new_plugin);
129
142
return NULL;
130
143
}
131
144
new_plugin->argv[0] = copy_name;
132
145
new_plugin->argv[1] = NULL;
133
134
new_plugin->environ = malloc(sizeof(char *));
146
147
do {
148
new_plugin->environ = malloc(sizeof(char *));
149
} while(new_plugin->environ == NULL and errno == EINTR);
135
150
if(new_plugin->environ == NULL){
136
151
free(copy_name);
137
152
free(new_plugin->argv);
139
154
return NULL;
140
155
}
141
156
new_plugin->environ[0] = NULL;
157
142
158
/* Append the new plugin to the list */
143
*plugin_list = new_plugin;
159
plugin_list = new_plugin;
144
160
return new_plugin;
145
161
}
146
162
148
164
static bool add_to_char_array(const char *new, char ***array,
149
165
int *len){
150
166
/* Resize the pointed-to array to hold one more pointer */
151
*array = realloc(*array, sizeof(char *)
152
* (size_t) ((*len) + 2));
167
do {
168
*array = realloc(*array, sizeof(char *)
169
* (size_t) ((*len) + 2));
170
} while(*array == NULL and errno == EINTR);
153
171
/* Malloc check */
154
172
if(*array == NULL){
155
173
return false;
156
174
}
157
175
/* Make a copy of the new string */
158
char *copy = strdup(new);
176
char *copy;
177
do {
178
copy = strdup(new);
179
} while(copy == NULL and errno == EINTR);
159
180
if(copy == NULL){
160
181
return false;
161
182
}
176
197
}
177
198
178
199
/* Add to a plugin's environment */
179
static bool add_environment(plugin *p, const char *def){
200
static bool add_environment(plugin *p, const char *def, bool replace){
180
201
if(p == NULL){
181
202
return false;
182
203
}
204
/* namelen = length of name of environment variable */
205
size_t namelen = (size_t)(strchrnul(def, '=') - def);
206
/* Search for this environment variable */
207
for(char **e = p->environ; *e != NULL; e++){
208
if(strncmp(*e, def, namelen + 1) == 0){
209
/* It already exists */
210
if(replace){
211
char *new;
212
do {
213
new = realloc(*e, strlen(def) + 1);
214
} while(new == NULL and errno == EINTR);
215
if(new == NULL){
216
return false;
217
}
218
*e = new;
219
strcpy(*e, def);
220
}
221
return true;
222
}
223
}
183
224
return add_to_char_array(def, &(p->environ), &(p->envc));
184
225
}
185
226
186
187
227
/*
188
228
* Based on the example in the GNU LibC manual chapter 13.13 "File
189
229
* Descriptor Flags".
190
* *Note File Descriptor Flags:(libc)Descriptor Flags.
230
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
191
231
*/
192
static int set_cloexec_flag(int fd)
193
{
194
int ret = fcntl(fd, F_GETFD, 0);
232
static int set_cloexec_flag(int fd){
233
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
195
234
/* If reading the flags failed, return error indication now. */
196
235
if(ret < 0){
197
236
return ret;
198
237
}
199
238
/* Store modified flag word in the descriptor. */
200
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
239
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
240
ret | FD_CLOEXEC));
201
241
}
202
242
203
process *process_list = NULL;
204
243
205
244
/* Mark processes as completed when they exit, and save their exit
206
245
status. */
207
void handle_sigchld(__attribute__((unused)) int sig){
246
static void handle_sigchld(__attribute__((unused)) int sig){
247
int old_errno = errno;
208
248
while(true){
209
process *proc = process_list;
249
plugin *proc = plugin_list;
210
250
int status;
211
251
pid_t pid = waitpid(-1, &status, WNOHANG);
212
252
if(pid == 0){
214
254
break;
215
255
}
216
256
if(pid == -1){
217
if (errno != ECHILD){
218
perror("waitpid");
257
if(errno == ECHILD){
258
/* No child processes */
259
break;
219
260
}
220
/* No child processes */
221
break;
261
perror("waitpid");
222
262
}
223
263
224
264
/* A child exited, find it in process_list */
225
265
while(proc != NULL and proc->pid != pid){
226
266
proc = proc->next;
230
270
continue;
231
271
}
232
272
proc->status = status;
233
proc->completed = true;
273
proc->completed = 1;
234
274
}
275
errno = old_errno;
235
276
}
236
277
237
bool print_out_password(const char *buffer, size_t length){
278
/* Prints out a password to stdout */
279
static bool print_out_password(const char *buffer, size_t length){
238
280
ssize_t ret;
239
if(length>0 and buffer[length-1] == '\n'){
240
length--;
241
}
242
281
for(size_t written = 0; written < length; written += (size_t)ret){
243
282
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
244
283
length - written));
249
288
return true;
250
289
}
251
290
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);
291
/* Removes and free a plugin from the plugin list */
292
static void free_plugin(plugin *plugin_node){
293
294
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
295
free(*arg);
296
}
297
free(plugin_node->argv);
298
for(char **env = plugin_node->environ; *env != NULL; env++){
299
free(*env);
300
}
301
free(plugin_node->environ);
302
free(plugin_node->buffer);
303
304
/* Removes the plugin from the singly-linked list */
305
if(plugin_node == plugin_list){
306
/* First one - simple */
307
plugin_list = plugin_list->next;
308
} else {
309
/* Second one or later */
310
for(plugin *p = plugin_list; p != NULL; p = p->next){
311
if(p->next == plugin_node){
312
p->next = plugin_node->next;
313
break;
314
}
315
}
316
}
317
318
free(plugin_node);
319
}
320
321
static void free_plugin_list(void){
322
while(plugin_list != NULL){
323
free_plugin(plugin_list);
264
324
}
265
325
}
266
326
274
334
struct stat st;
275
335
fd_set rfds_all;
276
336
int ret, maxfd = 0;
337
ssize_t sret;
277
338
uid_t uid = 65534;
278
339
gid_t gid = 65534;
279
340
bool debug = false;
304
365
{ .name = "global-options", .key = 'g',
305
366
.arg = "OPTION[,OPTION[,...]]",
306
367
.doc = "Options passed to all plugins" },
307
{ .name = "global-envs", .key = 'e',
368
{ .name = "global-env", .key = 'G',
308
369
.arg = "VAR=value",
309
370
.doc = "Environment variable passed to all plugins" },
310
371
{ .name = "options-for", .key = 'o',
311
372
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
312
373
.doc = "Options passed only to specified plugin" },
313
{ .name = "envs-for", .key = 'f',
374
{ .name = "env-for", .key = 'E',
314
375
.arg = "PLUGIN:ENV=value",
315
376
.doc = "Environment variable passed to specified plugin" },
316
377
{ .name = "disable", .key = 'd',
317
378
.arg = "PLUGIN",
318
379
.doc = "Disable a specific plugin", .group = 1 },
380
{ .name = "enable", .key = 'e',
381
.arg = "PLUGIN",
382
.doc = "Enable a specific plugin", .group = 1 },
319
383
{ .name = "plugin-dir", .key = 128,
320
384
.arg = "DIRECTORY",
321
385
.doc = "Specify a different plugin directory", .group = 2 },
333
397
{ .name = NULL }
334
398
};
335
399
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'){
400
error_t parse_opt(int key, char *arg, __attribute__((unused))
401
struct argp_state *state){
402
switch(key){
403
char *tmp;
404
intmax_t tmpmax;
405
case 'g': /* --global-options */
406
if(arg != NULL){
407
char *plugin_option;
408
while((plugin_option = strsep(&arg, ",")) != NULL){
409
if(plugin_option[0] == '\0'){
346
410
continue;
347
411
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
412
if(not add_argument(getplugin(NULL), plugin_option)){
349
413
perror("add_argument");
350
414
return ARGP_ERR_UNKNOWN;
351
415
}
352
416
}
353
417
}
354
418
break;
355
case 'e':
419
case 'G': /* --global-env */
356
420
if(arg == NULL){
357
421
break;
358
422
}
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
}
423
if(not add_environment(getplugin(NULL), arg, true)){
424
perror("add_environment");
367
425
}
368
426
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
}
427
case 'o': /* --options-for */
428
if(arg != NULL){
429
char *plugin_name = strsep(&arg, ":");
430
if(plugin_name[0] == '\0'){
431
break;
432
}
433
char *plugin_option;
434
while((plugin_option = strsep(&arg, ",")) != NULL){
435
if(not add_argument(getplugin(plugin_name), plugin_option)){
436
perror("add_argument");
437
return ARGP_ERR_UNKNOWN;
389
438
}
390
439
}
391
440
}
392
441
break;
393
case 'f':
442
case 'E': /* --env-for */
394
443
if(arg == NULL){
395
444
break;
396
445
}
399
448
if(envdef == NULL){
400
449
break;
401
450
}
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
451
*envdef = '\0';
452
if(not add_environment(getplugin(arg), envdef+1, true)){
408
453
perror("add_environment");
409
454
}
410
455
}
411
456
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
457
case 'd': /* --disable */
458
if(arg != NULL){
459
plugin *p = getplugin(arg);
415
460
if(p == NULL){
416
461
return ARGP_ERR_UNKNOWN;
417
462
}
418
463
p->disabled = true;
419
464
}
420
465
break;
421
case 128:
466
case 'e': /* --enable */
467
if(arg != NULL){
468
plugin *p = getplugin(arg);
469
if(p == NULL){
470
return ARGP_ERR_UNKNOWN;
471
}
472
p->disabled = false;
473
}
474
break;
475
case 128: /* --plugin-dir */
476
free(plugindir);
422
477
plugindir = strdup(arg);
423
478
if(plugindir == NULL){
424
479
perror("strdup");
425
}
426
break;
427
case 129:
480
}
481
break;
482
case 129: /* --config-file */
483
/* This is already done by parse_opt_config_file() */
484
break;
485
case 130: /* --userid */
486
errno = 0;
487
tmpmax = strtoimax(arg, &tmp, 10);
488
if(errno != 0 or tmp == arg or *tmp != '\0'
489
or tmpmax != (uid_t)tmpmax){
490
fprintf(stderr, "Bad user ID number: \"%s\", using %"
491
PRIdMAX "\n", arg, (intmax_t)uid);
492
} else {
493
uid = (uid_t)tmpmax;
494
}
495
break;
496
case 131: /* --groupid */
497
errno = 0;
498
tmpmax = strtoimax(arg, &tmp, 10);
499
if(errno != 0 or tmp == arg or *tmp != '\0'
500
or tmpmax != (gid_t)tmpmax){
501
fprintf(stderr, "Bad group ID number: \"%s\", using %"
502
PRIdMAX "\n", arg, (intmax_t)gid);
503
} else {
504
gid = (gid_t)tmpmax;
505
}
506
break;
507
case 132: /* --debug */
508
debug = true;
509
break;
510
/*
511
* When adding more options before this line, remember to also add a
512
* "case" to the "parse_opt_config_file" function below.
513
*/
514
case ARGP_KEY_ARG:
515
/* Cryptsetup always passes an argument, which is an empty
516
string if "none" was specified in /etc/crypttab. So if
517
argument was empty, we ignore it silently. */
518
if(arg[0] != '\0'){
519
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
520
}
521
break;
522
case ARGP_KEY_END:
523
break;
524
default:
525
return ARGP_ERR_UNKNOWN;
526
}
527
return 0;
528
}
529
530
/* This option parser is the same as parse_opt() above, except it
531
ignores everything but the --config-file option. */
532
error_t parse_opt_config_file(int key, char *arg,
533
__attribute__((unused))
534
struct argp_state *state){
535
switch(key){
536
case 'g': /* --global-options */
537
case 'G': /* --global-env */
538
case 'o': /* --options-for */
539
case 'E': /* --env-for */
540
case 'd': /* --disable */
541
case 'e': /* --enable */
542
case 128: /* --plugin-dir */
543
break;
544
case 129: /* --config-file */
545
free(argfile);
428
546
argfile = strdup(arg);
429
547
if(argfile == NULL){
430
548
perror("strdup");
431
549
}
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;
550
break;
551
case 130: /* --userid */
552
case 131: /* --groupid */
553
case 132: /* --debug */
442
554
case ARGP_KEY_ARG:
443
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
444
break;
445
555
case ARGP_KEY_END:
446
556
break;
447
557
default:
450
560
return 0;
451
561
}
452
562
453
plugin *plugin_list = NULL;
454
455
struct argp argp = { .options = options, .parser = parse_opt,
456
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
563
struct argp argp = { .options = options,
564
.parser = parse_opt_config_file,
565
.args_doc = "",
457
566
.doc = "Mandos plugin runner -- Run plugins" };
458
567
459
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
460
if (ret == ARGP_ERR_UNKNOWN){
568
/* Parse using parse_opt_config_file() in order to get the custom
569
config file location, if any. */
570
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
571
if(ret == ARGP_ERR_UNKNOWN){
461
572
fprintf(stderr, "Unknown error while parsing arguments\n");
462
573
exitstatus = EXIT_FAILURE;
463
574
goto fallback;
464
575
}
465
466
if (argfile == NULL){
576
577
/* Reset to the normal argument parser */
578
argp.parser = parse_opt;
579
580
/* Open the configfile if available */
581
if(argfile == NULL){
467
582
conffp = fopen(AFILE, "r");
468
583
} else {
469
584
conffp = fopen(argfile, "r");
470
585
}
471
472
586
if(conffp != NULL){
473
587
char *org_line = NULL;
474
588
char *p, *arg, *new_arg, *line;
475
589
size_t size = 0;
476
ssize_t sret;
477
590
const char whitespace_delims[] = " \r\t\f\v\n";
478
591
const char comment_delim[] = "#";
479
592
480
593
custom_argc = 1;
481
594
custom_argv = malloc(sizeof(char*) * 2);
482
595
if(custom_argv == NULL){
487
600
custom_argv[0] = argv[0];
488
601
custom_argv[1] = NULL;
489
602
603
/* for each line in the config file, strip whitespace and ignore
604
commented text */
490
605
while(true){
491
606
sret = getline(&org_line, &size, conffp);
492
607
if(sret == -1){
493
608
break;
494
609
}
495
610
496
611
line = org_line;
497
612
arg = strsep(&line, comment_delim);
498
613
while((p = strsep(&arg, whitespace_delims)) != NULL){
517
632
goto fallback;
518
633
}
519
634
custom_argv[custom_argc-1] = new_arg;
520
custom_argv[custom_argc] = NULL;
635
custom_argv[custom_argc] = NULL;
521
636
}
522
637
}
638
do {
639
ret = fclose(conffp);
640
} while(ret == EOF and errno == EINTR);
641
if(ret == EOF){
642
perror("fclose");
643
exitstatus = EXIT_FAILURE;
644
goto fallback;
645
}
523
646
free(org_line);
524
} else{
647
} else {
525
648
/* Check for harmful errors and go to fallback. Other errors might
526
649
not affect opening plugins */
527
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
650
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
528
651
perror("fopen");
529
652
exitstatus = EXIT_FAILURE;
530
653
goto fallback;
531
654
}
532
655
}
533
656
/* If there was any arguments from configuration file,
657
pass them to parser as command arguments */
534
658
if(custom_argv != NULL){
535
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
536
if (ret == ARGP_ERR_UNKNOWN){
659
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
660
0, NULL);
661
if(ret == ARGP_ERR_UNKNOWN){
537
662
fprintf(stderr, "Unknown error while parsing arguments\n");
538
663
exitstatus = EXIT_FAILURE;
539
664
goto fallback;
540
665
}
541
666
}
542
667
668
/* Parse actual command line arguments, to let them override the
669
config file */
670
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
671
if(ret == ARGP_ERR_UNKNOWN){
672
fprintf(stderr, "Unknown error while parsing arguments\n");
673
exitstatus = EXIT_FAILURE;
674
goto fallback;
675
}
676
543
677
if(debug){
544
678
for(plugin *p = plugin_list; p != NULL; p=p->next){
545
679
fprintf(stderr, "Plugin: %s has %d arguments\n",
547
681
for(char **a = p->argv; *a != NULL; a++){
548
682
fprintf(stderr, "\tArg: %s\n", *a);
549
683
}
550
fprintf(stderr, "...and %u environment variables\n", p->envc);
684
fprintf(stderr, "...and %d environment variables\n", p->envc);
551
685
for(char **a = p->environ; *a != NULL; a++){
552
686
fprintf(stderr, "\t%s\n", *a);
553
687
}
554
688
}
555
689
}
556
690
691
/* Strip permissions down to nobody */
692
setgid(gid);
693
if(ret == -1){
694
perror("setgid");
695
}
557
696
ret = setuid(uid);
558
if (ret == -1){
697
if(ret == -1){
559
698
perror("setuid");
560
699
}
561
700
562
setgid(gid);
563
if (ret == -1){
564
perror("setgid");
565
}
566
567
if (plugindir == NULL){
701
if(plugindir == NULL){
568
702
dir = opendir(PDIR);
569
703
} else {
570
704
dir = opendir(plugindir);
591
725
592
726
FD_ZERO(&rfds_all);
593
727
728
/* Read and execute any executable in the plugin directory*/
594
729
while(true){
595
dirst = readdir(dir);
730
do {
731
dirst = readdir(dir);
732
} while(dirst == NULL and errno == EINTR);
596
733
597
// All directory entries have been processed
734
/* All directory entries have been processed */
598
735
if(dirst == NULL){
599
if (errno == EBADF){
736
if(errno == EBADF){
600
737
perror("readdir");
601
738
exitstatus = EXIT_FAILURE;
602
739
goto fallback;
606
743
607
744
d_name_len = strlen(dirst->d_name);
608
745
609
// Ignore dotfiles, backup files and other junk
746
/* Ignore dotfiles, backup files and other junk */
610
747
{
611
748
bool bad_name = false;
612
749
614
751
615
752
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
616
753
".dpkg-old",
754
".dpkg-bak",
617
755
".dpkg-divert", NULL };
618
756
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
619
757
size_t pre_len = strlen(*pre);
627
765
break;
628
766
}
629
767
}
630
631
768
if(bad_name){
632
769
continue;
633
770
}
634
635
771
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
636
772
size_t suf_len = strlen(*suf);
637
773
if((d_name_len >= suf_len)
650
786
continue;
651
787
}
652
788
}
653
789
654
790
char *filename;
655
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
791
if(plugindir == NULL){
792
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, PDIR "/%s",
793
dirst->d_name));
794
} else {
795
ret = (int)TEMP_FAILURE_RETRY(asprintf(&filename, "%s/%s",
796
plugindir,
797
dirst->d_name));
798
}
656
799
if(ret < 0){
657
800
perror("asprintf");
658
801
continue;
659
802
}
660
803
661
ret = stat(filename, &st);
662
if (ret == -1){
804
ret = (int)TEMP_FAILURE_RETRY(stat(filename, &st));
805
if(ret == -1){
663
806
perror("stat");
664
807
free(filename);
665
808
continue;
666
809
}
667
810
668
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
811
/* Ignore non-executable files */
812
if(not S_ISREG(st.st_mode)
813
or (TEMP_FAILURE_RETRY(access(filename, X_OK)) != 0)){
669
814
if(debug){
670
815
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
671
816
" with bad type or mode\n", filename);
673
818
free(filename);
674
819
continue;
675
820
}
676
plugin *p = getplugin(dirst->d_name, &plugin_list);
821
822
plugin *p = getplugin(dirst->d_name);
677
823
if(p == NULL){
678
824
perror("getplugin");
679
825
free(filename);
689
835
}
690
836
{
691
837
/* Add global arguments to argument list for this plugin */
692
plugin *g = getplugin(NULL, &plugin_list);
838
plugin *g = getplugin(NULL);
693
839
if(g != NULL){
694
840
for(char **a = g->argv + 1; *a != NULL; a++){
695
841
if(not add_argument(p, *a)){
698
844
}
699
845
/* Add global environment variables */
700
846
for(char **e = g->environ; *e != NULL; e++){
701
if(not add_environment(p, *e)){
847
if(not add_environment(p, *e, false)){
702
848
perror("add_environment");
703
849
}
704
850
}
709
855
process, too. */
710
856
if(p->environ[0] != NULL){
711
857
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)){
858
if(not add_environment(p, *e, false)){
718
859
perror("add_environment");
719
860
}
720
861
}
721
862
}
722
863
723
864
int pipefd[2];
724
ret = pipe(pipefd);
725
if (ret == -1){
865
ret = (int)TEMP_FAILURE_RETRY(pipe(pipefd));
866
if(ret == -1){
726
867
perror("pipe");
727
868
exitstatus = EXIT_FAILURE;
728
869
goto fallback;
729
870
}
871
/* Ask OS to automatic close the pipe on exec */
730
872
ret = set_cloexec_flag(pipefd[0]);
731
873
if(ret < 0){
732
874
perror("set_cloexec_flag");
740
882
goto fallback;
741
883
}
742
884
/* Block SIGCHLD until process is safely in process list */
743
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
885
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_BLOCK,
886
&sigchld_action.sa_mask,
887
NULL));
744
888
if(ret < 0){
745
889
perror("sigprocmask");
746
890
exitstatus = EXIT_FAILURE;
747
891
goto fallback;
748
892
}
749
// Starting a new process to be watched
750
pid_t pid = fork();
893
/* Starting a new process to be watched */
894
pid_t pid;
895
do {
896
pid = fork();
897
} while(pid == -1 and errno == EINTR);
751
898
if(pid == -1){
752
899
perror("fork");
753
900
exitstatus = EXIT_FAILURE;
760
907
perror("sigaction");
761
908
_exit(EXIT_FAILURE);
762
909
}
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
764
911
if(ret < 0){
765
912
perror("sigprocmask");
766
913
_exit(EXIT_FAILURE);
767
914
}
768
915
769
916
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
770
917
if(ret == -1){
771
918
perror("dup2");
790
937
}
791
938
/* no return */
792
939
}
793
/* parent process */
940
/* Parent process */
941
TEMP_FAILURE_RETRY(close(pipefd[1])); /* Close unused write end of
942
pipe */
794
943
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);
944
plugin *new_plugin = getplugin(dirst->d_name);
945
if(new_plugin == NULL){
946
perror("getplugin");
947
ret = (int)(TEMP_FAILURE_RETRY
948
(sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
949
NULL)));
800
950
if(ret < 0){
801
perror("sigprocmask");
951
perror("sigprocmask");
802
952
}
803
953
exitstatus = EXIT_FAILURE;
804
954
goto fallback;
805
955
}
806
956
807
*new_process = (struct process){ .pid = pid,
808
.fd = pipefd[0],
809
.next = process_list };
810
// List handling
811
process_list = new_process;
957
new_plugin->pid = pid;
958
new_plugin->fd = pipefd[0];
959
812
960
/* Unblock SIGCHLD so signal handler can be run if this process
813
961
has already completed */
814
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
962
ret = (int)TEMP_FAILURE_RETRY(sigprocmask(SIG_UNBLOCK,
963
&sigchld_action.sa_mask,
964
NULL));
815
965
if(ret < 0){
816
966
perror("sigprocmask");
817
967
exitstatus = EXIT_FAILURE;
818
968
goto fallback;
819
969
}
820
970
821
FD_SET(new_process->fd, &rfds_all);
971
FD_SET(new_plugin->fd, &rfds_all); /* Spurious warning from
972
-Wconversion */
822
973
823
if (maxfd < new_process->fd){
824
maxfd = new_process->fd;
974
if(maxfd < new_plugin->fd){
975
maxfd = new_plugin->fd;
825
976
}
826
827
977
}
828
829
free_plugin_list(plugin_list);
830
plugin_list = NULL;
831
978
832
closedir(dir);
979
TEMP_FAILURE_RETRY(closedir(dir));
833
980
dir = NULL;
834
835
if (process_list == NULL){
836
fprintf(stderr, "No plugin processes started. Incorrect plugin"
837
" directory?\n");
838
process_list = NULL;
981
free_plugin(getplugin(NULL));
982
983
for(plugin *p = plugin_list; p != NULL; p = p->next){
984
if(p->pid != 0){
985
break;
986
}
987
if(p->next == NULL){
988
fprintf(stderr, "No plugin processes started. Incorrect plugin"
989
" directory?\n");
990
free_plugin_list();
991
}
839
992
}
840
while(process_list){
993
994
/* Main loop while running plugins exist */
995
while(plugin_list){
841
996
fd_set rfds = rfds_all;
842
997
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
843
if (select_ret == -1){
998
if(select_ret == -1 and errno != EINTR){
844
999
perror("select");
845
1000
exitstatus = EXIT_FAILURE;
846
1001
goto fallback;
847
1002
}
848
1003
/* OK, now either a process completed, or something can be read
849
1004
from one of them */
850
for(process *proc = process_list; proc ; proc = proc->next){
1005
for(plugin *proc = plugin_list; proc != NULL;){
851
1006
/* Is this process completely done? */
852
if(proc->eof and proc->completed){
1007
if(proc->completed and proc->eof){
853
1008
/* Only accept the plugin output if it exited cleanly */
854
1009
if(not WIFEXITED(proc->status)
855
1010
or WEXITSTATUS(proc->status) != 0){
856
1011
/* Bad exit by plugin */
1012
857
1013
if(debug){
858
1014
if(WIFEXITED(proc->status)){
859
fprintf(stderr, "Plugin %u exited with status %d\n",
860
(unsigned int) (proc->pid),
1015
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
1016
" status %d\n", proc->name,
1017
(intmax_t) (proc->pid),
861
1018
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));
1019
} else if(WIFSIGNALED(proc->status)){
1020
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
1021
" signal %d: %s\n", proc->name,
1022
(intmax_t) (proc->pid),
1023
WTERMSIG(proc->status),
1024
strsignal(WTERMSIG(proc->status)));
866
1025
} else if(WCOREDUMP(proc->status)){
867
fprintf(stderr, "Plugin %d dumped core\n",
868
(unsigned int) (proc->pid));
1026
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
1027
" core\n", proc->name, (intmax_t) (proc->pid));
869
1028
}
870
1029
}
1030
871
1031
/* Remove the plugin */
872
FD_CLR(proc->fd, &rfds_all);
1032
FD_CLR(proc->fd, &rfds_all); /* Spurious warning from
1033
-Wconversion */
1034
873
1035
/* Block signal while modifying process_list */
874
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
1036
ret = (int)TEMP_FAILURE_RETRY(sigprocmask
1037
(SIG_BLOCK,
1038
&sigchld_action.sa_mask,
1039
NULL));
875
1040
if(ret < 0){
876
1041
perror("sigprocmask");
877
1042
exitstatus = EXIT_FAILURE;
878
1043
goto fallback;
879
1044
}
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
}
1045
1046
plugin *next_plugin = proc->next;
1047
free_plugin(proc);
1048
proc = next_plugin;
1049
893
1050
/* We are done modifying process list, so unblock signal */
894
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
895
NULL);
1051
ret = (int)(TEMP_FAILURE_RETRY
1052
(sigprocmask(SIG_UNBLOCK,
1053
&sigchld_action.sa_mask, NULL)));
896
1054
if(ret < 0){
897
1055
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;
1056
exitstatus = EXIT_FAILURE;
1057
goto fallback;
1058
}
1059
1060
if(plugin_list == NULL){
1061
break;
1062
}
1063
1064
continue;
905
1065
}
1066
906
1067
/* This process exited nicely, so print its buffer */
907
1068
908
1069
bool bret = print_out_password(proc->buffer,
909
1070
proc->buffer_length);
910
1071
if(not bret){
913
1074
}
914
1075
goto fallback;
915
1076
}
1077
916
1078
/* This process has not completed. Does it have any output? */
917
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1079
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){ /* Spurious
1080
warning from
1081
-Wconversion */
918
1082
/* This process had nothing to say at this time */
1083
proc = proc->next;
919
1084
continue;
920
1085
}
921
1086
/* Before reading, make the process' data buffer large enough */
922
1087
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
923
1088
proc->buffer = realloc(proc->buffer, proc->buffer_size
924
1089
+ (size_t) BUFFER_SIZE);
925
if (proc->buffer == NULL){
1090
if(proc->buffer == NULL){
926
1091
perror("malloc");
927
1092
exitstatus = EXIT_FAILURE;
928
1093
goto fallback;
930
1095
proc->buffer_size += BUFFER_SIZE;
931
1096
}
932
1097
/* Read from the process */
933
ret = read(proc->fd, proc->buffer + proc->buffer_length,
934
BUFFER_SIZE);
935
if(ret < 0){
1098
sret = TEMP_FAILURE_RETRY(read(proc->fd,
1099
proc->buffer
1100
+ proc->buffer_length,
1101
BUFFER_SIZE));
1102
if(sret < 0){
936
1103
/* Read error from this process; ignore the error */
1104
proc = proc->next;
937
1105
continue;
938
1106
}
939
if(ret == 0){
1107
if(sret == 0){
940
1108
/* got EOF */
941
1109
proc->eof = true;
942
1110
} else {
943
proc->buffer_length += (size_t) ret;
1111
proc->buffer_length += (size_t) sret;
944
1112
}
945
1113
}
946
1114
}
947
948
1115
1116
949
1117
fallback:
950
1118
951
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1119
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
952
1120
/* Fallback if all plugins failed, none are found or an error
953
1121
occured */
954
1122
bool bret;
955
1123
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
956
1124
char *passwordbuffer = getpass("Password: ");
957
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1125
size_t len = strlen(passwordbuffer);
1126
/* Strip trailing newline */
1127
if(len > 0 and passwordbuffer[len-1] == '\n'){
1128
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1129
len--;
1130
}
1131
bret = print_out_password(passwordbuffer, len);
958
1132
if(not bret){
959
1133
perror("print_out_password");
960
1134
exitstatus = EXIT_FAILURE;
967
1141
perror("sigaction");
968
1142
exitstatus = EXIT_FAILURE;
969
1143
}
970
1144
971
1145
if(custom_argv != NULL){
972
1146
for(char **arg = custom_argv+1; *arg != NULL; arg++){
973
1147
free(*arg);
974
1148
}
975
1149
free(custom_argv);
976
1150
}
977
free_plugin_list(plugin_list);
978
1151
979
1152
if(dir != NULL){
980
1153
closedir(dir);
981
1154
}
982
1155
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");
1156
/* Kill the processes */
1157
for(plugin *p = plugin_list; p != NULL; p = p->next){
1158
if(p->pid != 0){
1159
close(p->fd);
1160
ret = kill(p->pid, SIGTERM);
1161
if(ret == -1 and errno != ESRCH){
1162
/* Set-uid proccesses might not get closed */
1163
perror("kill");
1164
}
991
1165
}
992
free(process_list->buffer);
993
free(process_list);
994
1166
}
995
1167
996
1168
/* Wait for any remaining child processes to terminate */
997
do{
1169
do {
998
1170
ret = wait(NULL);
999
1171
} while(ret >= 0);
1000
1172
if(errno != ECHILD){
1001
1173
perror("wait");
1002
1174
}
1003
1175
1176
free_plugin_list();
1177
1004
1178
free(plugindir);
1005
1179
free(argfile);
1006
1180
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0