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- Committer: Teddy Hogeborn
- Date: 2009-01-27 00:07:26 UTC
- Revision ID: teddy@fukt.bsnet.se-20090127000726-4cafcfy35g8kh2b8
* INSTALL (Prerequisites/Mandos Server): Added "PyGObject".
- 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:
- Makefile
added
removed
plugin-runner.c
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,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
60
62
#include <signal.h> /* struct sigaction, sigemptyset(),
61
63
sigaddset(), sigaction(),
62
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
63
65
SIG_UNBLOCK, kill() */
64
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
65
68
66
69
#define BUFFER_SIZE 256
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
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;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
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
86
77
typedef struct plugin{
87
78
char *name; /* can be NULL or any plugin name */
88
79
char **argv;
90
81
char **environ;
91
82
int envc;
92
83
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;
93
94
struct plugin *next;
94
95
} plugin;
95
96
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))){
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))){
100
106
return p;
101
107
}
102
108
}
103
109
/* Create a new plugin */
104
110
plugin *new_plugin = malloc(sizeof(plugin));
105
if (new_plugin == NULL){
111
if(new_plugin == NULL){
106
112
return NULL;
107
113
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
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
}
111
121
}
112
122
113
123
*new_plugin = (plugin) { .name = copy_name,
114
124
.argc = 1,
115
.envc = 0,
116
125
.disabled = false,
117
.next = *plugin_list };
126
.next = plugin_list };
118
127
119
128
new_plugin->argv = malloc(sizeof(char *) * 2);
120
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
130
free(copy_name);
121
131
free(new_plugin);
122
132
return NULL;
123
133
}
124
134
new_plugin->argv[0] = copy_name;
125
135
new_plugin->argv[1] = NULL;
126
136
127
137
new_plugin->environ = malloc(sizeof(char *));
128
138
if(new_plugin->environ == NULL){
139
free(copy_name);
129
140
free(new_plugin->argv);
130
141
free(new_plugin);
131
142
return NULL;
132
143
}
133
144
new_plugin->environ[0] = NULL;
145
134
146
/* Append the new plugin to the list */
135
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
136
148
return new_plugin;
137
149
}
138
150
168
180
}
169
181
170
182
/* Add to a plugin's environment */
171
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
172
184
if(p == NULL){
173
185
return false;
174
186
}
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
}
175
204
return add_to_char_array(def, &(p->environ), &(p->envc));
176
205
}
177
206
178
179
207
/*
180
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
181
209
* Descriptor Flags".
182
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
183
211
*/
184
static int set_cloexec_flag(int fd)
185
{
212
static int set_cloexec_flag(int fd){
186
213
int ret = fcntl(fd, F_GETFD, 0);
187
214
/* If reading the flags failed, return error indication now. */
188
215
if(ret < 0){
192
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
193
220
}
194
221
195
process *process_list = NULL;
196
222
197
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
198
224
status. */
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
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
}
216
253
}
217
254
218
bool print_out_password(const char *buffer, size_t length){
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
219
257
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
223
258
for(size_t written = 0; written < length; written += (size_t)ret){
224
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
225
260
length - written));
230
265
return true;
231
266
}
232
267
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
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
}
239
292
}
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
293
}
294
295
free(plugin_node);
252
296
}
253
297
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
268
302
}
269
303
270
304
int main(int argc, char *argv[]){
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
273
307
FILE *conffp;
274
308
size_t d_name_len;
275
309
DIR *dir = NULL;
276
310
struct dirent *dirst;
277
311
struct stat st;
278
312
fd_set rfds_all;
279
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
280
316
uid_t uid = 65534;
281
317
gid_t gid = 65534;
282
318
bool debug = false;
298
334
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
299
335
if(ret == -1){
300
336
perror("sigaction");
301
exitstatus = EXIT_FAILURE;
337
exitstatus = EXIT_FAILURE;
302
338
goto fallback;
303
339
}
304
340
307
343
{ .name = "global-options", .key = 'g',
308
344
.arg = "OPTION[,OPTION[,...]]",
309
345
.doc = "Options passed to all plugins" },
310
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
311
347
.arg = "VAR=value",
312
348
.doc = "Environment variable passed to all plugins" },
313
349
{ .name = "options-for", .key = 'o',
314
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
315
351
.doc = "Options passed only to specified plugin" },
316
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
317
353
.arg = "PLUGIN:ENV=value",
318
354
.doc = "Environment variable passed to specified plugin" },
319
355
{ .name = "disable", .key = 'd',
320
356
.arg = "PLUGIN",
321
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
322
361
{ .name = "plugin-dir", .key = 128,
323
362
.arg = "DIRECTORY",
324
363
.doc = "Specify a different plugin directory", .group = 2 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
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 },
333
375
{ .name = NULL }
334
376
};
335
377
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){
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){
343
383
char *p;
344
384
while((p = strsep(&arg, ",")) != NULL){
345
385
if(p[0] == '\0'){
346
386
continue;
347
387
}
348
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
349
389
perror("add_argument");
350
390
return ARGP_ERR_UNKNOWN;
351
391
}
352
392
}
353
393
}
354
394
break;
355
case 'e':
395
case 'G': /* --global-env */
356
396
if(arg == NULL){
357
397
break;
358
398
}
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
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
367
401
}
368
402
break;
369
case 'o':
370
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
371
405
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
373
407
break;
374
408
}
375
409
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
377
411
break;
378
412
}
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
}
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;
389
421
}
390
422
}
391
423
}
392
424
break;
393
case 'f':
425
case 'E': /* --env-for */
394
426
if(arg == NULL){
395
427
break;
396
428
}
399
431
if(envdef == NULL){
400
432
break;
401
433
}
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)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
408
436
perror("add_environment");
409
437
}
410
438
}
411
439
break;
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
415
443
if(p == NULL){
416
444
return ARGP_ERR_UNKNOWN;
417
445
}
418
446
p->disabled = true;
419
447
}
420
448
break;
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
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 */
431
489
debug = true;
432
490
break;
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
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 = "",
448
547
.doc = "Mandos plugin runner -- Run plugins" };
449
548
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
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){
452
553
fprintf(stderr, "Unknown error while parsing arguments\n");
453
554
exitstatus = EXIT_FAILURE;
454
555
goto fallback;
455
556
}
456
457
conffp = fopen(argfile, "r");
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
}
458
567
if(conffp != NULL){
459
568
char *org_line = NULL;
460
569
char *p, *arg, *new_arg, *line;
461
570
size_t size = 0;
462
ssize_t sret;
463
571
const char whitespace_delims[] = " \r\t\f\v\n";
464
572
const char comment_delim[] = "#";
465
573
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 */
466
586
while(true){
467
587
sret = getline(&org_line, &size, conffp);
468
588
if(sret == -1){
476
596
continue;
477
597
}
478
598
new_arg = strdup(p);
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
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;
485
617
}
486
618
}
487
619
free(org_line);
488
} else{
620
} else {
489
621
/* Check for harmful errors and go to fallback. Other errors might
490
622
not affect opening plugins */
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
492
624
perror("fopen");
493
625
exitstatus = EXIT_FAILURE;
494
626
goto fallback;
495
627
}
496
628
}
497
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
498
631
if(custom_argv != NULL){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
502
635
fprintf(stderr, "Unknown error while parsing arguments\n");
503
636
exitstatus = EXIT_FAILURE;
504
637
goto fallback;
505
638
}
506
639
}
507
640
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
508
650
if(debug){
509
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
510
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
512
654
for(char **a = p->argv; *a != NULL; a++){
513
655
fprintf(stderr, "\tArg: %s\n", *a);
514
656
}
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
516
658
for(char **a = p->environ; *a != NULL; a++){
517
659
fprintf(stderr, "\t%s\n", *a);
518
660
}
519
661
}
520
662
}
521
663
664
/* Strip permissions down to nobody */
522
665
ret = setuid(uid);
523
if (ret == -1){
666
if(ret == -1){
524
667
perror("setuid");
525
}
526
668
}
527
669
setgid(gid);
528
if (ret == -1){
670
if(ret == -1){
529
671
perror("setgid");
530
672
}
531
673
532
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
533
680
if(dir == NULL){
534
681
perror("Could not open plugin dir");
535
682
exitstatus = EXIT_FAILURE;
551
698
552
699
FD_ZERO(&rfds_all);
553
700
701
/* Read and execute any executable in the plugin directory*/
554
702
while(true){
555
703
dirst = readdir(dir);
556
704
557
// All directory entries have been processed
705
/* All directory entries have been processed */
558
706
if(dirst == NULL){
559
if (errno == EBADF){
707
if(errno == EBADF){
560
708
perror("readdir");
561
709
exitstatus = EXIT_FAILURE;
562
710
goto fallback;
566
714
567
715
d_name_len = strlen(dirst->d_name);
568
716
569
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
570
718
{
571
719
bool bad_name = false;
572
720
574
722
575
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
576
724
".dpkg-old",
725
".dpkg-bak",
577
726
".dpkg-divert", NULL };
578
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
579
728
size_t pre_len = strlen(*pre);
587
736
break;
588
737
}
589
738
}
590
591
739
if(bad_name){
592
740
continue;
593
741
}
594
595
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
596
743
size_t suf_len = strlen(*suf);
597
744
if((d_name_len >= suf_len)
612
759
}
613
760
614
761
char *filename;
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
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
}
616
767
if(ret < 0){
617
768
perror("asprintf");
618
769
continue;
619
770
}
620
771
621
772
ret = stat(filename, &st);
622
if (ret == -1){
773
if(ret == -1){
623
774
perror("stat");
624
775
free(filename);
625
776
continue;
626
777
}
627
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
629
781
if(debug){
630
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
631
783
" with bad type or mode\n", filename);
633
785
free(filename);
634
786
continue;
635
787
}
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
637
790
if(p == NULL){
638
791
perror("getplugin");
639
792
free(filename);
649
802
}
650
803
{
651
804
/* Add global arguments to argument list for this plugin */
652
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
653
806
if(g != NULL){
654
807
for(char **a = g->argv + 1; *a != NULL; a++){
655
808
if(not add_argument(p, *a)){
658
811
}
659
812
/* Add global environment variables */
660
813
for(char **e = g->environ; *e != NULL; e++){
661
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
662
815
perror("add_environment");
663
816
}
664
817
}
669
822
process, too. */
670
823
if(p->environ[0] != NULL){
671
824
for(char **e = environ; *e != NULL; e++){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
825
if(not add_environment(p, *e, false)){
678
826
perror("add_environment");
679
827
}
680
828
}
681
829
}
682
830
683
int pipefd[2];
831
int pipefd[2];
684
832
ret = pipe(pipefd);
685
if (ret == -1){
833
if(ret == -1){
686
834
perror("pipe");
687
835
exitstatus = EXIT_FAILURE;
688
836
goto fallback;
689
837
}
838
/* Ask OS to automatic close the pipe on exec */
690
839
ret = set_cloexec_flag(pipefd[0]);
691
840
if(ret < 0){
692
841
perror("set_cloexec_flag");
700
849
goto fallback;
701
850
}
702
851
/* Block SIGCHLD until process is safely in process list */
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
704
853
if(ret < 0){
705
854
perror("sigprocmask");
706
855
exitstatus = EXIT_FAILURE;
707
856
goto fallback;
708
857
}
709
// Starting a new process to be watched
858
/* Starting a new process to be watched */
710
859
pid_t pid = fork();
711
860
if(pid == -1){
712
861
perror("fork");
720
869
perror("sigaction");
721
870
_exit(EXIT_FAILURE);
722
871
}
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
724
873
if(ret < 0){
725
874
perror("sigprocmask");
726
875
_exit(EXIT_FAILURE);
727
876
}
728
877
729
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
730
879
if(ret == -1){
731
880
perror("dup2");
750
899
}
751
900
/* no return */
752
901
}
753
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
754
904
free(filename);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
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);
760
909
if(ret < 0){
761
perror("sigprocmask");
910
perror("sigprocmask");
762
911
}
763
912
exitstatus = EXIT_FAILURE;
764
913
goto fallback;
765
914
}
766
915
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
772
919
/* Unblock SIGCHLD so signal handler can be run if this process
773
920
has already completed */
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
775
922
if(ret < 0){
776
923
perror("sigprocmask");
777
924
exitstatus = EXIT_FAILURE;
778
925
goto fallback;
779
926
}
780
927
781
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
782
929
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
785
932
}
786
787
933
}
788
934
789
free_plugin_list(plugin_list);
790
791
935
closedir(dir);
792
936
dir = NULL;
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = 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
}
798
947
}
799
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
800
951
fd_set rfds = rfds_all;
801
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
802
if (select_ret == -1){
953
if(select_ret == -1){
803
954
perror("select");
804
955
exitstatus = EXIT_FAILURE;
805
956
goto fallback;
806
957
}
807
958
/* OK, now either a process completed, or something can be read
808
959
from one of them */
809
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
810
961
/* Is this process completely done? */
811
962
if(proc->eof and proc->completed){
812
963
/* Only accept the plugin output if it exited cleanly */
813
964
if(not WIFEXITED(proc->status)
814
965
or WEXITSTATUS(proc->status) != 0){
815
966
/* Bad exit by plugin */
967
816
968
if(debug){
817
969
if(WIFEXITED(proc->status)){
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
820
972
WEXITSTATUS(proc->status));
821
973
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
824
976
WTERMSIG(proc->status));
825
977
} else if(WCOREDUMP(proc->status)){
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
828
980
}
829
981
}
982
830
983
/* Remove the plugin */
831
984
FD_CLR(proc->fd, &rfds_all);
985
832
986
/* Block signal while modifying process_list */
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
834
988
if(ret < 0){
835
989
perror("sigprocmask");
836
990
exitstatus = EXIT_FAILURE;
837
991
goto fallback;
838
992
}
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
852
998
/* We are done modifying process list, so unblock signal */
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
855
1001
if(ret < 0){
856
1002
perror("sigprocmask");
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
864
1012
}
1013
865
1014
/* This process exited nicely, so print its buffer */
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
868
1018
if(not bret){
869
1019
perror("print_out_password");
870
1020
exitstatus = EXIT_FAILURE;
871
1021
}
872
1022
goto fallback;
873
1023
}
1024
874
1025
/* This process has not completed. Does it have any output? */
875
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
876
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
877
1029
continue;
878
1030
}
879
1031
/* Before reading, make the process' data buffer large enough */
880
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
881
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
882
1034
+ (size_t) BUFFER_SIZE);
883
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
884
1036
perror("malloc");
885
1037
exitstatus = EXIT_FAILURE;
886
1038
goto fallback;
888
1040
proc->buffer_size += BUFFER_SIZE;
889
1041
}
890
1042
/* Read from the process */
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
894
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
895
1048
continue;
896
1049
}
897
if(ret == 0){
1050
if(sret == 0){
898
1051
/* got EOF */
899
1052
proc->eof = true;
900
1053
} else {
901
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
902
1055
}
903
1056
}
904
1057
}
906
1059
907
1060
fallback:
908
1061
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
911
1065
bool bret;
912
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
913
1067
char *passwordbuffer = getpass("Password: ");
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
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);
915
1075
if(not bret){
916
1076
perror("print_out_password");
917
1077
exitstatus = EXIT_FAILURE;
924
1084
perror("sigaction");
925
1085
exitstatus = EXIT_FAILURE;
926
1086
}
927
1087
928
1088
if(custom_argv != NULL){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
930
1090
free(*arg);
931
1091
}
932
1092
free(custom_argv);
933
1093
}
934
free_plugin_list(plugin_list);
935
1094
936
1095
if(dir != NULL){
937
1096
closedir(dir);
938
1097
}
939
1098
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
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
}
948
1108
}
949
free(process_list->buffer);
950
free(process_list);
951
1109
}
952
1110
953
1111
/* Wait for any remaining child processes to terminate */
958
1116
perror("wait");
959
1117
}
960
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
961
1124
return exitstatus;
962
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0