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- Committer: Björn Påhlsson
- Date: 2008-08-16 17:11:35 UTC
- mfrom: (79 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816171135-w1v8mrtsxs0ghfa6
merge
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
63
SIG_UNBLOCK, kill() */
67
64
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
65
70
66
#define BUFFER_SIZE 256
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
76
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
78
86
typedef struct plugin{
79
87
char *name; /* can be NULL or any plugin name */
80
88
char **argv;
82
90
char **environ;
83
91
int envc;
84
92
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
95
93
struct plugin *next;
96
94
} plugin;
97
95
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
107
100
return p;
108
101
}
109
102
}
110
103
/* Create a new plugin */
111
104
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
105
if (new_plugin == NULL){
113
106
return NULL;
114
107
}
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
122
}
123
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
108
*new_plugin = (plugin) { .name = name,
109
.argc = 1,
110
.envc = 0,
111
.disabled = false,
112
.next = *plugin_list };
128
113
129
114
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
115
if (new_plugin->argv == NULL){
132
116
free(new_plugin);
133
117
return NULL;
134
118
}
135
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
136
120
new_plugin->argv[1] = NULL;
137
121
138
122
new_plugin->environ = malloc(sizeof(char *));
139
123
if(new_plugin->environ == NULL){
140
free(copy_name);
141
124
free(new_plugin->argv);
142
125
free(new_plugin);
143
126
return NULL;
144
127
}
145
128
new_plugin->environ[0] = NULL;
146
147
129
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
149
131
return new_plugin;
150
132
}
151
133
181
163
}
182
164
183
165
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
185
167
if(p == NULL){
186
168
return false;
187
169
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
170
return add_to_char_array(def, &(p->environ), &(p->envc));
206
171
}
207
172
173
208
174
/*
209
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
176
* Descriptor Flags".
211
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
178
*/
213
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
214
181
int ret = fcntl(fd, F_GETFD, 0);
215
182
/* If reading the flags failed, return error indication now. */
216
183
if(ret < 0){
220
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
188
}
222
189
190
process *process_list = NULL;
223
191
224
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
225
193
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
194
void handle_sigchld(__attribute__((unused)) int sig){
195
process *proc = process_list;
196
int status;
197
pid_t pid = wait(&status);
198
if(pid == -1){
199
perror("wait");
200
return;
201
}
202
while(proc != NULL and proc->pid != pid){
203
proc = proc->next;
204
}
205
if(proc == NULL){
206
/* Process not found in process list */
207
return;
208
}
209
proc->status = status;
210
proc->completed = true;
256
211
}
257
212
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
260
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
261
218
for(size_t written = 0; written < length; written += (size_t)ret){
262
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
220
length - written));
268
225
return true;
269
226
}
270
227
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
228
char **add_to_argv(char **argv, int *argc, char *arg){
229
if (argv == NULL){
230
*argc = 1;
231
argv = malloc(sizeof(char*) * 2);
232
if(argv == NULL){
233
return NULL;
295
234
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
235
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
236
argv[1] = NULL;
237
}
238
*argc += 1;
239
argv = realloc(argv, sizeof(char *)
240
* ((unsigned int) *argc + 1));
241
if(argv == NULL){
242
return NULL;
243
}
244
argv[*argc-1] = arg;
245
argv[*argc] = NULL;
246
return argv;
305
247
}
306
248
307
249
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
310
252
FILE *conffp;
311
253
size_t d_name_len;
312
254
DIR *dir = NULL;
314
256
struct stat st;
315
257
fd_set rfds_all;
316
258
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
319
259
uid_t uid = 65534;
320
260
gid_t gid = 65534;
321
261
bool debug = false;
329
269
/* Establish a signal handler */
330
270
sigemptyset(&sigchld_action.sa_mask);
331
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
332
if(ret == -1){
272
if(ret < 0){
333
273
perror("sigaddset");
334
exitstatus = EXIT_FAILURE;
335
goto fallback;
274
exit(EXIT_FAILURE);
336
275
}
337
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
if(ret == -1){
277
if(ret < 0){
339
278
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
341
goto fallback;
279
exit(EXIT_FAILURE);
342
280
}
343
281
344
282
/* The options we understand. */
346
284
{ .name = "global-options", .key = 'g',
347
285
.arg = "OPTION[,OPTION[,...]]",
348
286
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
350
288
.arg = "VAR=value",
351
289
.doc = "Environment variable passed to all plugins" },
352
290
{ .name = "options-for", .key = 'o',
353
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
292
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
356
294
.arg = "PLUGIN:ENV=value",
357
295
.doc = "Environment variable passed to specified plugin" },
358
296
{ .name = "disable", .key = 'd',
359
297
.arg = "PLUGIN",
360
298
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
299
{ .name = "plugin-dir", .key = 128,
365
300
.arg = "DIRECTORY",
366
301
.doc = "Specify a different plugin directory", .group = 2 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
302
{ .name = "userid", .key = 129,
303
.arg = "ID", .flags = 0,
304
.doc = "User ID the plugins will run as", .group = 2 },
305
{ .name = "groupid", .key = 130,
306
.arg = "ID", .flags = 0,
307
.doc = "Group ID the plugins will run as", .group = 2 },
308
{ .name = "debug", .key = 131,
309
.doc = "Debug mode", .group = 3 },
378
310
{ .name = NULL }
379
311
};
380
312
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
313
error_t parse_opt (int key, char *arg, struct argp_state *state) {
314
/* Get the INPUT argument from `argp_parse', which we know is a
315
pointer to our plugin list pointer. */
316
plugin **plugins = state->input;
317
switch (key) {
318
case 'g':
319
if (arg != NULL){
320
char *p;
321
while((p = strsep(&arg, ",")) != NULL){
322
if(p[0] == '\0'){
390
323
continue;
391
324
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
393
326
perror("add_argument");
394
327
return ARGP_ERR_UNKNOWN;
395
328
}
396
329
}
397
330
}
398
331
break;
399
case 'G': /* --global-env */
332
case 'e':
400
333
if(arg == NULL){
401
334
break;
402
335
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
336
{
337
char *envdef = strdup(arg);
338
if(envdef == NULL){
339
break;
340
}
341
if(not add_environment(getplugin(NULL, plugins), envdef)){
342
perror("add_environment");
343
}
405
344
}
406
345
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
346
case 'o':
347
if (arg != NULL){
348
char *p_name = strsep(&arg, ":");
349
if(p_name[0] == '\0'){
350
break;
351
}
352
char *opt = strsep(&arg, ":");
353
if(opt[0] == '\0'){
354
break;
355
}
356
if(opt != NULL){
357
char *p;
358
while((p = strsep(&opt, ",")) != NULL){
359
if(p[0] == '\0'){
360
continue;
361
}
362
if(not add_argument(getplugin(p_name, plugins), p)){
363
perror("add_argument");
364
return ARGP_ERR_UNKNOWN;
365
}
418
366
}
419
367
}
420
368
}
421
369
break;
422
case 'E': /* --env-for */
370
case 'f':
423
371
if(arg == NULL){
424
372
break;
425
373
}
428
376
if(envdef == NULL){
429
377
break;
430
378
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
379
char *p_name = strndup(arg, (size_t) (envdef-arg));
380
if(p_name == NULL){
381
break;
382
}
383
envdef++;
384
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
385
perror("add_environment");
434
386
}
435
387
}
436
388
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
440
392
if(p == NULL){
441
393
return ARGP_ERR_UNKNOWN;
442
394
}
443
395
p->disabled = true;
444
396
}
445
397
break;
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
398
case 128:
399
plugindir = arg;
400
break;
401
case 129:
402
uid = (uid_t)strtol(arg, NULL, 10);
403
break;
404
case 130:
405
gid = (gid_t)strtol(arg, NULL, 10);
406
break;
407
case 131:
488
408
debug = true;
489
409
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
410
case ARGP_KEY_ARG:
411
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
412
break;
413
case ARGP_KEY_END:
414
break;
415
default:
416
return ARGP_ERR_UNKNOWN;
417
}
418
return 0;
419
}
420
421
plugin *plugin_list = NULL;
422
423
struct argp argp = { .options = options, .parser = parse_opt,
424
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
425
.doc = "Mandos plugin runner -- Run plugins" };
547
426
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
552
429
fprintf(stderr, "Unknown error while parsing arguments\n");
553
430
exitstatus = EXIT_FAILURE;
554
goto fallback;
431
goto end;
555
432
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
433
434
conffp = fopen(argfile, "r");
566
435
if(conffp != NULL){
567
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
568
439
char *p, *arg, *new_arg, *line;
569
size_t size = 0;
570
440
const char whitespace_delims[] = " \r\t\f\v\n";
571
441
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
442
585
443
while(true){
586
444
sret = getline(&org_line, &size, conffp);
587
445
if(sret == -1){
588
446
break;
589
447
}
590
448
591
449
line = org_line;
592
450
arg = strsep(&line, comment_delim);
593
451
while((p = strsep(&arg, whitespace_delims)) != NULL){
595
453
continue;
596
454
}
597
455
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
456
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
457
if (custom_argv == NULL){
458
perror("add_to_argv");
459
exitstatus = EXIT_FAILURE;
460
goto end;
461
}
616
462
}
617
463
}
618
464
free(org_line);
619
} else {
465
} else{
620
466
/* Check for harmful errors and go to fallback. Other errors might
621
467
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
469
perror("fopen");
624
470
exitstatus = EXIT_FAILURE;
625
goto fallback;
471
goto end;
626
472
}
627
473
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
474
630
475
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
476
custom_argv[0] = argv[0];
477
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
478
if (ret == ARGP_ERR_UNKNOWN){
634
479
fprintf(stderr, "Unknown error while parsing arguments\n");
635
480
exitstatus = EXIT_FAILURE;
636
goto fallback;
481
goto end;
637
482
}
638
483
}
639
484
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
485
if(debug){
650
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
489
for(char **a = p->argv; *a != NULL; a++){
654
490
fprintf(stderr, "\tArg: %s\n", *a);
655
491
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
493
for(char **a = p->environ; *a != NULL; a++){
658
494
fprintf(stderr, "\t%s\n", *a);
659
495
}
660
496
}
661
497
}
662
498
663
/* Strip permissions down to nobody */
499
ret = setuid(uid);
500
if (ret == -1){
501
perror("setuid");
502
}
503
664
504
setgid(gid);
665
if(ret == -1){
505
if (ret == -1){
666
506
perror("setgid");
667
507
}
668
ret = setuid(uid);
669
if(ret == -1){
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
508
509
dir = opendir(plugindir);
679
510
if(dir == NULL){
680
511
perror("Could not open plugin dir");
681
512
exitstatus = EXIT_FAILURE;
682
goto fallback;
513
goto end;
683
514
}
684
515
685
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
690
521
if(ret < 0){
691
522
perror("set_cloexec_flag");
692
523
exitstatus = EXIT_FAILURE;
693
goto fallback;
524
goto end;
694
525
}
695
526
}
696
527
}
697
528
698
529
FD_ZERO(&rfds_all);
699
530
700
/* Read and execute any executable in the plugin directory*/
701
531
while(true){
702
532
dirst = readdir(dir);
703
533
704
/* All directory entries have been processed */
534
// All directory entries have been processed
705
535
if(dirst == NULL){
706
if(errno == EBADF){
536
if (errno == EBADF){
707
537
perror("readdir");
708
538
exitstatus = EXIT_FAILURE;
709
goto fallback;
539
goto end;
710
540
}
711
541
break;
712
542
}
713
543
714
544
d_name_len = strlen(dirst->d_name);
715
545
716
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
717
547
{
718
548
bool bad_name = false;
719
549
721
551
722
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
553
".dpkg-old",
724
".dpkg-bak",
725
554
".dpkg-divert", NULL };
726
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
556
size_t pre_len = strlen(*pre);
735
564
break;
736
565
}
737
566
}
567
738
568
if(bad_name){
739
569
continue;
740
570
}
571
741
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
573
size_t suf_len = strlen(*suf);
743
574
if((d_name_len >= suf_len)
756
587
continue;
757
588
}
758
589
}
759
590
760
591
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
593
if(ret < 0){
767
594
perror("asprintf");
768
595
continue;
769
596
}
770
597
771
598
ret = stat(filename, &st);
772
if(ret == -1){
599
if (ret == -1){
773
600
perror("stat");
774
601
free(filename);
775
602
continue;
776
603
}
777
604
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
606
if(debug){
781
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
608
" with bad type or mode\n", filename);
784
610
free(filename);
785
611
continue;
786
612
}
787
788
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
614
if(p == NULL){
790
615
perror("getplugin");
791
616
free(filename);
801
626
}
802
627
{
803
628
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
805
630
if(g != NULL){
806
631
for(char **a = g->argv + 1; *a != NULL; a++){
807
632
if(not add_argument(p, *a)){
810
635
}
811
636
/* Add global environment variables */
812
637
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
814
639
perror("add_environment");
815
640
}
816
641
}
821
646
process, too. */
822
647
if(p->environ[0] != NULL){
823
648
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
649
char *copy = strdup(*e);
650
if(copy == NULL){
651
perror("strdup");
652
continue;
653
}
654
if(not add_environment(p, copy)){
825
655
perror("add_environment");
826
656
}
827
657
}
828
658
}
829
659
830
int pipefd[2];
660
int pipefd[2];
831
661
ret = pipe(pipefd);
832
if(ret == -1){
662
if (ret == -1){
833
663
perror("pipe");
834
664
exitstatus = EXIT_FAILURE;
835
goto fallback;
665
goto end;
836
666
}
837
/* Ask OS to automatic close the pipe on exec */
838
667
ret = set_cloexec_flag(pipefd[0]);
839
668
if(ret < 0){
840
669
perror("set_cloexec_flag");
841
670
exitstatus = EXIT_FAILURE;
842
goto fallback;
671
goto end;
843
672
}
844
673
ret = set_cloexec_flag(pipefd[1]);
845
674
if(ret < 0){
846
675
perror("set_cloexec_flag");
847
676
exitstatus = EXIT_FAILURE;
848
goto fallback;
677
goto end;
849
678
}
850
679
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
681
if(ret < 0){
853
682
perror("sigprocmask");
854
683
exitstatus = EXIT_FAILURE;
855
goto fallback;
684
goto end;
856
685
}
857
/* Starting a new process to be watched */
686
// Starting a new process to be watched
858
687
pid_t pid = fork();
859
688
if(pid == -1){
860
689
perror("fork");
861
690
exitstatus = EXIT_FAILURE;
862
goto fallback;
691
goto end;
863
692
}
864
693
if(pid == 0){
865
694
/* this is the child process */
868
697
perror("sigaction");
869
698
_exit(EXIT_FAILURE);
870
699
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
701
if(ret < 0){
873
702
perror("sigprocmask");
874
703
_exit(EXIT_FAILURE);
875
704
}
876
705
877
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
707
if(ret == -1){
879
708
perror("dup2");
898
727
}
899
728
/* no return */
900
729
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
903
731
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
732
close(pipefd[1]); /* close unused write end of pipe */
733
process *new_process = malloc(sizeof(process));
734
if (new_process == NULL){
735
perror("malloc");
736
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
737
if(ret < 0){
909
perror("sigprocmask");
738
perror("sigprocmask");
910
739
}
911
740
exitstatus = EXIT_FAILURE;
912
goto fallback;
741
goto end;
913
742
}
914
743
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
918
749
/* Unblock SIGCHLD so signal handler can be run if this process
919
750
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
752
if(ret < 0){
922
753
perror("sigprocmask");
923
754
exitstatus = EXIT_FAILURE;
924
goto fallback;
925
}
926
927
FD_SET(new_plugin->fd, &rfds_all);
928
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
931
}
755
goto end;
756
}
757
758
FD_SET(new_process->fd, &rfds_all);
759
760
if (maxfd < new_process->fd){
761
maxfd = new_process->fd;
762
}
763
764
}
765
766
/* Free the plugin list */
767
for(plugin *next; plugin_list != NULL; plugin_list = next){
768
next = plugin_list->next;
769
free(plugin_list->argv);
770
if(plugin_list->environ[0] != NULL){
771
for(char **e = plugin_list->environ; *e != NULL; e++){
772
free(*e);
773
}
774
}
775
free(plugin_list);
932
776
}
933
777
934
778
closedir(dir);
935
779
dir = NULL;
936
free_plugin(getplugin(NULL));
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
780
781
if (process_list == NULL){
782
fprintf(stderr, "No plugin processes started. Incorrect plugin"
783
" directory?\n");
784
process_list = NULL;
947
785
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
786
while(process_list){
951
787
fd_set rfds = rfds_all;
952
788
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
789
if (select_ret == -1){
954
790
perror("select");
955
791
exitstatus = EXIT_FAILURE;
956
goto fallback;
792
goto end;
957
793
}
958
794
/* OK, now either a process completed, or something can be read
959
795
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
796
for(process *proc = process_list; proc ; proc = proc->next){
961
797
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
798
if(proc->eof and proc->completed){
963
799
/* Only accept the plugin output if it exited cleanly */
964
800
if(not WIFEXITED(proc->status)
965
801
or WEXITSTATUS(proc->status) != 0){
966
802
/* Bad exit by plugin */
967
968
803
if(debug){
969
804
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
973
807
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
808
} else if(WIFSIGNALED(proc->status)) {
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
978
811
WTERMSIG(proc->status));
979
812
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
982
815
}
983
816
}
984
985
817
/* Remove the plugin */
986
818
FD_CLR(proc->fd, &rfds_all);
987
988
819
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
821
if(ret < 0){
991
822
perror("sigprocmask");
992
823
exitstatus = EXIT_FAILURE;
993
goto fallback;
994
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
824
goto end;
825
}
826
/* Delete this process entry from the list */
827
if(process_list == proc){
828
/* First one - simple */
829
process_list = proc->next;
830
} else {
831
/* Second one or later */
832
for(process *p = process_list; p != NULL; p = p->next){
833
if(p->next == proc){
834
p->next = proc->next;
835
break;
836
}
837
}
838
}
1000
839
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1003
842
if(ret < 0){
1004
843
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
844
}
845
free(proc->buffer);
846
free(proc);
847
/* We deleted this process from the list, so we can't go
848
proc->next. Therefore, start over from the beginning of
849
the process list */
850
break;
1014
851
}
1015
1016
852
/* This process exited nicely, so print its buffer */
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1020
855
if(not bret){
1021
856
perror("print_out_password");
1022
857
exitstatus = EXIT_FAILURE;
1023
858
}
1024
goto fallback;
859
goto end;
1025
860
}
1026
1027
861
/* This process has not completed. Does it have any output? */
1028
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
863
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
864
continue;
1032
865
}
1033
866
/* Before reading, make the process' data buffer large enough */
1034
867
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
869
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
870
if (proc->buffer == NULL){
1038
871
perror("malloc");
1039
872
exitstatus = EXIT_FAILURE;
1040
goto fallback;
873
goto end;
1041
874
}
1042
875
proc->buffer_size += BUFFER_SIZE;
1043
876
}
1044
877
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1048
881
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
882
continue;
1051
883
}
1052
if(sret == 0){
884
if(ret == 0){
1053
885
/* got EOF */
1054
886
proc->eof = true;
1055
887
} else {
1056
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1057
889
}
1058
890
}
1059
891
}
1060
1061
1062
fallback:
1063
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
892
893
894
end:
895
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1067
898
bool bret;
1068
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
900
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
902
if(not bret){
1078
903
perror("print_out_password");
1079
904
exitstatus = EXIT_FAILURE;
905
goto end;
1080
906
}
1081
907
}
1082
908
1083
909
/* Restore old signal handler */
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1088
}
1089
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
free(*arg);
910
sigaction(SIGCHLD, &old_sigchld_action, NULL);
911
912
free(custom_argv);
913
914
/* Free the plugin list */
915
for(plugin *next; plugin_list != NULL; plugin_list = next){
916
next = plugin_list->next;
917
free(plugin_list->argv);
918
if(plugin_list->environ[0] != NULL){
919
for(char **e = plugin_list->environ; *e != NULL; e++){
920
free(*e);
921
}
1093
922
}
1094
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1095
925
}
1096
926
1097
927
if(dir != NULL){
1098
928
closedir(dir);
1099
929
}
1100
930
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
931
/* Free the process list and kill the processes */
932
for(process *next; process_list != NULL; process_list = next){
933
next = process_list->next;
934
close(process_list->fd);
935
ret = kill(process_list->pid, SIGTERM);
936
if(ret == -1 and errno != ESRCH){
937
/* set-uid proccesses migth not get closed */
938
perror("kill");
1110
939
}
940
free(process_list->buffer);
941
free(process_list);
1111
942
}
1112
943
1113
944
/* Wait for any remaining child processes to terminate */
1118
949
perror("wait");
1119
950
}
1120
951
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
1126
952
return exitstatus;
1127
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0