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- Committer: Teddy Hogeborn
- Date: 2008-08-16 16:58:31 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816165831-cx018vo5i9oqmgo0
* plugins.d/password-request.c (main): Include environment variables
"cryptsource" and "crypttarget"
in password prompt.
"cryptsource" and "crypttarget"
in password prompt.
- 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
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
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";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
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
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
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))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin) { .name = copy_name,
108
*new_plugin = (plugin) { .name = name,
124
109
.argc = 1,
110
.envc = 0,
125
111
.disabled = false,
126
.next = plugin_list };
112
.next = *plugin_list };
127
113
128
114
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
115
if (new_plugin->argv == NULL){
131
116
free(new_plugin);
132
117
return NULL;
133
118
}
134
new_plugin->argv[0] = copy_name;
119
new_plugin->argv[0] = name;
135
120
new_plugin->argv[1] = NULL;
136
121
137
122
new_plugin->environ = malloc(sizeof(char *));
138
123
if(new_plugin->environ == NULL){
139
free(copy_name);
140
124
free(new_plugin->argv);
141
125
free(new_plugin);
142
126
return NULL;
143
127
}
144
128
new_plugin->environ[0] = NULL;
145
146
129
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
130
*plugin_list = new_plugin;
148
131
return new_plugin;
149
132
}
150
133
180
163
}
181
164
182
165
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
166
static bool add_environment(plugin *p, const char *def){
184
167
if(p == NULL){
185
168
return false;
186
169
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
170
return add_to_char_array(def, &(p->environ), &(p->envc));
205
171
}
206
172
173
207
174
/*
208
175
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
176
* Descriptor Flags".
210
177
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
178
*/
212
static int set_cloexec_flag(int fd){
179
static int set_cloexec_flag(int fd)
180
{
213
181
int ret = fcntl(fd, F_GETFD, 0);
214
182
/* If reading the flags failed, return error indication now. */
215
183
if(ret < 0){
219
187
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
188
}
221
189
190
process *process_list = NULL;
222
191
223
/* Mark processes as completed when they exit, and save their exit
192
/* Mark a process as completed when it exits, and save its exit
224
193
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
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;
253
211
}
254
212
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
213
bool print_out_password(const char *buffer, size_t length){
257
214
ssize_t ret;
215
if(length>0 and buffer[length-1] == '\n'){
216
length--;
217
}
258
218
for(size_t written = 0; written < length; written += (size_t)ret){
259
219
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
220
length - written));
265
225
return true;
266
226
}
267
227
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
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;
292
234
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
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;
302
247
}
303
248
304
249
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
250
const char *plugindir = "/lib/mandos/plugins.d";
251
const char *argfile = ARGFILE;
307
252
FILE *conffp;
308
253
size_t d_name_len;
309
254
DIR *dir = NULL;
310
255
struct dirent *dirst;
311
256
struct stat st;
312
257
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
258
int ret, maxfd = 0;
316
259
uid_t uid = 65534;
317
260
gid_t gid = 65534;
318
261
bool debug = false;
326
269
/* Establish a signal handler */
327
270
sigemptyset(&sigchld_action.sa_mask);
328
271
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
329
if(ret == -1){
272
if(ret < 0){
330
273
perror("sigaddset");
331
exitstatus = EXIT_FAILURE;
332
goto fallback;
274
exit(EXIT_FAILURE);
333
275
}
334
276
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
335
if(ret == -1){
277
if(ret < 0){
336
278
perror("sigaction");
337
exitstatus = EXIT_FAILURE;
338
goto fallback;
279
exit(EXIT_FAILURE);
339
280
}
340
281
341
282
/* The options we understand. */
343
284
{ .name = "global-options", .key = 'g',
344
285
.arg = "OPTION[,OPTION[,...]]",
345
286
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
287
{ .name = "global-envs", .key = 'e',
347
288
.arg = "VAR=value",
348
289
.doc = "Environment variable passed to all plugins" },
349
290
{ .name = "options-for", .key = 'o',
350
291
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
292
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
293
{ .name = "envs-for", .key = 'f',
353
294
.arg = "PLUGIN:ENV=value",
354
295
.doc = "Environment variable passed to specified plugin" },
355
296
{ .name = "disable", .key = 'd',
356
297
.arg = "PLUGIN",
357
298
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
299
{ .name = "plugin-dir", .key = 128,
362
300
.arg = "DIRECTORY",
363
301
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.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 },
375
310
{ .name = NULL }
376
311
};
377
312
378
error_t parse_opt(int key, char *arg, __attribute__((unused))
379
struct argp_state *state) {
380
switch(key) {
381
case 'g': /* --global-options */
382
if(arg != NULL){
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){
383
320
char *p;
384
321
while((p = strsep(&arg, ",")) != NULL){
385
322
if(p[0] == '\0'){
386
323
continue;
387
324
}
388
if(not add_argument(getplugin(NULL), p)){
325
if(not add_argument(getplugin(NULL, plugins), p)){
389
326
perror("add_argument");
390
327
return ARGP_ERR_UNKNOWN;
391
328
}
392
329
}
393
330
}
394
331
break;
395
case 'G': /* --global-env */
332
case 'e':
396
333
if(arg == NULL){
397
334
break;
398
335
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
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
}
401
344
}
402
345
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
346
case 'o':
347
if (arg != NULL){
405
348
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
349
if(p_name[0] == '\0'){
407
350
break;
408
351
}
409
352
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
353
if(opt[0] == '\0'){
411
354
break;
412
355
}
413
char *p;
414
while((p = strsep(&opt, ",")) != NULL){
415
if(p[0] == '\0'){
416
continue;
417
}
418
if(not add_argument(getplugin(p_name), p)){
419
perror("add_argument");
420
return ARGP_ERR_UNKNOWN;
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
}
421
366
}
422
367
}
423
368
}
424
369
break;
425
case 'E': /* --env-for */
370
case 'f':
426
371
if(arg == NULL){
427
372
break;
428
373
}
431
376
if(envdef == NULL){
432
377
break;
433
378
}
434
*envdef = '\0';
435
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)){
436
385
perror("add_environment");
437
386
}
438
387
}
439
388
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
389
case 'd':
390
if (arg != NULL){
391
plugin *p = getplugin(arg, plugins);
443
392
if(p == NULL){
444
393
return ARGP_ERR_UNKNOWN;
445
394
}
446
395
p->disabled = true;
447
396
}
448
397
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
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:
489
408
debug = true;
490
409
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state) {
516
switch(key) {
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.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]",
547
425
.doc = "Mandos plugin runner -- Run plugins" };
548
426
549
/* Parse using parse_opt_config_file() in order to get the custom
550
config file location, if any. */
551
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
552
if(ret == ARGP_ERR_UNKNOWN){
427
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
428
if (ret == ARGP_ERR_UNKNOWN){
553
429
fprintf(stderr, "Unknown error while parsing arguments\n");
554
430
exitstatus = EXIT_FAILURE;
555
goto fallback;
431
goto end;
556
432
}
557
558
/* Reset to the normal argument parser */
559
argp.parser = parse_opt;
560
561
/* Open the configfile if available */
562
if(argfile == NULL){
563
conffp = fopen(AFILE, "r");
564
} else {
565
conffp = fopen(argfile, "r");
566
}
433
434
conffp = fopen(argfile, "r");
567
435
if(conffp != NULL){
568
436
char *org_line = NULL;
437
size_t size = 0;
438
ssize_t sret;
569
439
char *p, *arg, *new_arg, *line;
570
size_t size = 0;
571
440
const char whitespace_delims[] = " \r\t\f\v\n";
572
441
const char comment_delim[] = "#";
573
442
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
443
while(true){
587
444
sret = getline(&org_line, &size, conffp);
588
445
if(sret == -1){
596
453
continue;
597
454
}
598
455
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
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
}
617
462
}
618
463
}
619
464
free(org_line);
620
} else {
465
} else{
621
466
/* Check for harmful errors and go to fallback. Other errors might
622
467
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
468
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
469
perror("fopen");
625
470
exitstatus = EXIT_FAILURE;
626
goto fallback;
471
goto end;
627
472
}
628
473
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
474
631
475
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
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){
635
479
fprintf(stderr, "Unknown error while parsing arguments\n");
636
480
exitstatus = EXIT_FAILURE;
637
goto fallback;
481
goto end;
638
482
}
639
483
}
640
484
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
485
if(debug){
651
486
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
487
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
489
for(char **a = p->argv; *a != NULL; a++){
655
490
fprintf(stderr, "\tArg: %s\n", *a);
656
491
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
492
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
493
for(char **a = p->environ; *a != NULL; a++){
659
494
fprintf(stderr, "\t%s\n", *a);
660
495
}
661
496
}
662
497
}
663
498
664
/* Strip permissions down to nobody */
665
499
ret = setuid(uid);
666
if(ret == -1){
500
if (ret == -1){
667
501
perror("setuid");
668
}
502
}
503
669
504
setgid(gid);
670
if(ret == -1){
505
if (ret == -1){
671
506
perror("setgid");
672
507
}
673
508
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
509
dir = opendir(plugindir);
680
510
if(dir == NULL){
681
511
perror("Could not open plugin dir");
682
512
exitstatus = EXIT_FAILURE;
683
goto fallback;
513
goto end;
684
514
}
685
515
686
516
/* Set the FD_CLOEXEC flag on the directory, if possible */
691
521
if(ret < 0){
692
522
perror("set_cloexec_flag");
693
523
exitstatus = EXIT_FAILURE;
694
goto fallback;
524
goto end;
695
525
}
696
526
}
697
527
}
698
528
699
529
FD_ZERO(&rfds_all);
700
530
701
/* Read and execute any executable in the plugin directory*/
702
531
while(true){
703
532
dirst = readdir(dir);
704
533
705
/* All directory entries have been processed */
534
// All directory entries have been processed
706
535
if(dirst == NULL){
707
if(errno == EBADF){
536
if (errno == EBADF){
708
537
perror("readdir");
709
538
exitstatus = EXIT_FAILURE;
710
goto fallback;
539
goto end;
711
540
}
712
541
break;
713
542
}
714
543
715
544
d_name_len = strlen(dirst->d_name);
716
545
717
/* Ignore dotfiles, backup files and other junk */
546
// Ignore dotfiles, backup files and other junk
718
547
{
719
548
bool bad_name = false;
720
549
722
551
723
552
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
553
".dpkg-old",
725
".dpkg-bak",
726
554
".dpkg-divert", NULL };
727
555
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
556
size_t pre_len = strlen(*pre);
736
564
break;
737
565
}
738
566
}
567
739
568
if(bad_name){
740
569
continue;
741
570
}
571
742
572
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
573
size_t suf_len = strlen(*suf);
744
574
if((d_name_len >= suf_len)
759
589
}
760
590
761
591
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
592
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
593
if(ret < 0){
768
594
perror("asprintf");
769
595
continue;
770
596
}
771
597
772
598
ret = stat(filename, &st);
773
if(ret == -1){
599
if (ret == -1){
774
600
perror("stat");
775
601
free(filename);
776
602
continue;
777
603
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
604
605
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
606
if(debug){
782
607
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
608
" with bad type or mode\n", filename);
785
610
free(filename);
786
611
continue;
787
612
}
788
789
plugin *p = getplugin(dirst->d_name);
613
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
614
if(p == NULL){
791
615
perror("getplugin");
792
616
free(filename);
802
626
}
803
627
{
804
628
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
629
plugin *g = getplugin(NULL, &plugin_list);
806
630
if(g != NULL){
807
631
for(char **a = g->argv + 1; *a != NULL; a++){
808
632
if(not add_argument(p, *a)){
811
635
}
812
636
/* Add global environment variables */
813
637
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
638
if(not add_environment(p, *e)){
815
639
perror("add_environment");
816
640
}
817
641
}
822
646
process, too. */
823
647
if(p->environ[0] != NULL){
824
648
for(char **e = environ; *e != NULL; e++){
825
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)){
826
655
perror("add_environment");
827
656
}
828
657
}
829
658
}
830
659
831
int pipefd[2];
660
int pipefd[2];
832
661
ret = pipe(pipefd);
833
if(ret == -1){
662
if (ret == -1){
834
663
perror("pipe");
835
664
exitstatus = EXIT_FAILURE;
836
goto fallback;
665
goto end;
837
666
}
838
/* Ask OS to automatic close the pipe on exec */
839
667
ret = set_cloexec_flag(pipefd[0]);
840
668
if(ret < 0){
841
669
perror("set_cloexec_flag");
842
670
exitstatus = EXIT_FAILURE;
843
goto fallback;
671
goto end;
844
672
}
845
673
ret = set_cloexec_flag(pipefd[1]);
846
674
if(ret < 0){
847
675
perror("set_cloexec_flag");
848
676
exitstatus = EXIT_FAILURE;
849
goto fallback;
677
goto end;
850
678
}
851
679
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
680
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
681
if(ret < 0){
854
682
perror("sigprocmask");
855
683
exitstatus = EXIT_FAILURE;
856
goto fallback;
684
goto end;
857
685
}
858
/* Starting a new process to be watched */
686
// Starting a new process to be watched
859
687
pid_t pid = fork();
860
688
if(pid == -1){
861
689
perror("fork");
862
690
exitstatus = EXIT_FAILURE;
863
goto fallback;
691
goto end;
864
692
}
865
693
if(pid == 0){
866
694
/* this is the child process */
869
697
perror("sigaction");
870
698
_exit(EXIT_FAILURE);
871
699
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
700
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
701
if(ret < 0){
874
702
perror("sigprocmask");
875
703
_exit(EXIT_FAILURE);
876
704
}
877
705
878
706
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
707
if(ret == -1){
880
708
perror("dup2");
899
727
}
900
728
/* no return */
901
729
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
730
/* parent process */
904
731
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
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);
909
737
if(ret < 0){
910
perror("sigprocmask");
738
perror("sigprocmask");
911
739
}
912
740
exitstatus = EXIT_FAILURE;
913
goto fallback;
741
goto end;
914
742
}
915
743
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
744
*new_process = (struct process){ .pid = pid,
745
.fd = pipefd[0],
746
.next = process_list };
747
// List handling
748
process_list = new_process;
919
749
/* Unblock SIGCHLD so signal handler can be run if this process
920
750
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
751
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
752
if(ret < 0){
923
753
perror("sigprocmask");
924
754
exitstatus = EXIT_FAILURE;
925
goto fallback;
926
}
927
928
FD_SET(new_plugin->fd, &rfds_all);
929
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
932
}
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);
933
776
}
934
777
935
778
closedir(dir);
936
779
dir = 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
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 %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
805
fprintf(stderr, "Plugin %u exited with status %d\n",
806
(unsigned int) (proc->pid),
972
807
WEXITSTATUS(proc->status));
973
808
} else if(WIFSIGNALED(proc->status)) {
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
809
fprintf(stderr, "Plugin %u killed by signal %d\n",
810
(unsigned int) (proc->pid),
976
811
WTERMSIG(proc->status));
977
812
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
813
fprintf(stderr, "Plugin %d dumped core\n",
814
(unsigned int) (proc->pid));
980
815
}
981
816
}
982
983
817
/* Remove the plugin */
984
818
FD_CLR(proc->fd, &rfds_all);
985
986
819
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
820
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
821
if(ret < 0){
989
822
perror("sigprocmask");
990
823
exitstatus = EXIT_FAILURE;
991
goto fallback;
992
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
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
}
998
839
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
840
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
841
NULL);
1001
842
if(ret < 0){
1002
843
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
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;
1012
851
}
1013
1014
852
/* This process exited nicely, so print its buffer */
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
853
854
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
855
if(not bret){
1019
856
perror("print_out_password");
1020
857
exitstatus = EXIT_FAILURE;
1021
858
}
1022
goto fallback;
859
goto end;
1023
860
}
1024
1025
861
/* This process has not completed. Does it have any output? */
1026
862
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
863
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
864
continue;
1030
865
}
1031
866
/* Before reading, make the process' data buffer large enough */
1032
867
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
868
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
869
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
870
if (proc->buffer == NULL){
1036
871
perror("malloc");
1037
872
exitstatus = EXIT_FAILURE;
1038
goto fallback;
873
goto end;
1039
874
}
1040
875
proc->buffer_size += BUFFER_SIZE;
1041
876
}
1042
877
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
878
ret = read(proc->fd, proc->buffer + proc->buffer_length,
879
BUFFER_SIZE);
880
if(ret < 0){
1046
881
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
882
continue;
1049
883
}
1050
if(sret == 0){
884
if(ret == 0){
1051
885
/* got EOF */
1052
886
proc->eof = true;
1053
887
} else {
1054
proc->buffer_length += (size_t) sret;
888
proc->buffer_length += (size_t) ret;
1055
889
}
1056
890
}
1057
891
}
1058
892
1059
893
1060
fallback:
894
end:
1061
895
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
896
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
897
/* Fallback if all plugins failed, none are found or an error occured */
1065
898
bool bret;
1066
899
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
900
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
901
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
902
if(not bret){
1076
903
perror("print_out_password");
1077
904
exitstatus = EXIT_FAILURE;
905
goto end;
1078
906
}
1079
907
}
1080
908
1081
909
/* Restore old signal handler */
1082
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1083
if(ret == -1){
1084
perror("sigaction");
1085
exitstatus = EXIT_FAILURE;
1086
}
1087
1088
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1090
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
}
1091
922
}
1092
free(custom_argv);
923
free(plugin_list->environ);
924
free(plugin_list);
1093
925
}
1094
926
1095
927
if(dir != NULL){
1096
928
closedir(dir);
1097
929
}
1098
930
1099
/* Kill the processes */
1100
for(plugin *p = plugin_list; p != NULL; p = p->next){
1101
if(p->pid != 0){
1102
close(p->fd);
1103
ret = kill(p->pid, SIGTERM);
1104
if(ret == -1 and errno != ESRCH){
1105
/* Set-uid proccesses might not get closed */
1106
perror("kill");
1107
}
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");
1108
939
}
940
free(process_list->buffer);
941
free(process_list);
1109
942
}
1110
943
1111
944
/* Wait for any remaining child processes to terminate */
1116
949
perror("wait");
1117
950
}
1118
951
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
952
return exitstatus;
1125
953
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0