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- Committer: Teddy Hogeborn
- Date: 2009-01-26 23:47:44 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090126234744-c19lb7zn1qsrcwmv
* debian/control (mandos/Depends): Added "python-gobject".
- 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,
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
69
70
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;
71
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
72
76
73
struct process;
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
74
84
75
typedef struct process{
85
/* Variables used for running processes*/
76
86
pid_t pid;
77
87
int fd;
78
88
char *buffer;
81
91
bool eof;
82
92
volatile bool completed;
83
93
volatile int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
char **environ;
92
int envc;
93
bool disabled;
94
94
struct plugin *next;
95
95
} plugin;
96
96
97
static plugin *getplugin(char *name, plugin **plugin_list){
98
for (plugin *p = *plugin_list; p != NULL; p = p->next){
99
if ((p->name == name)
100
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))){
101
106
return p;
102
107
}
103
108
}
104
109
/* Create a new plugin */
105
110
plugin *new_plugin = malloc(sizeof(plugin));
106
if (new_plugin == NULL){
111
if(new_plugin == NULL){
107
112
return NULL;
108
113
}
109
114
char *copy_name = NULL;
110
115
if(name != NULL){
111
116
copy_name = strdup(name);
112
117
if(copy_name == NULL){
118
free(new_plugin);
113
119
return NULL;
114
120
}
115
121
}
116
122
117
123
*new_plugin = (plugin) { .name = copy_name,
118
124
.argc = 1,
119
.envc = 0,
120
125
.disabled = false,
121
.next = *plugin_list };
126
.next = plugin_list };
122
127
123
128
new_plugin->argv = malloc(sizeof(char *) * 2);
124
if (new_plugin->argv == NULL){
129
if(new_plugin->argv == NULL){
125
130
free(copy_name);
126
131
free(new_plugin);
127
132
return NULL;
128
133
}
129
134
new_plugin->argv[0] = copy_name;
130
135
new_plugin->argv[1] = NULL;
131
136
132
137
new_plugin->environ = malloc(sizeof(char *));
133
138
if(new_plugin->environ == NULL){
134
139
free(copy_name);
137
142
return NULL;
138
143
}
139
144
new_plugin->environ[0] = NULL;
145
140
146
/* Append the new plugin to the list */
141
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
142
148
return new_plugin;
143
149
}
144
150
174
180
}
175
181
176
182
/* Add to a plugin's environment */
177
static bool add_environment(plugin *p, const char *def){
183
static bool add_environment(plugin *p, const char *def, bool replace){
178
184
if(p == NULL){
179
185
return false;
180
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
}
181
204
return add_to_char_array(def, &(p->environ), &(p->envc));
182
205
}
183
206
184
185
207
/*
186
208
* Based on the example in the GNU LibC manual chapter 13.13 "File
187
209
* Descriptor Flags".
188
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
189
211
*/
190
static int set_cloexec_flag(int fd)
191
{
212
static int set_cloexec_flag(int fd){
192
213
int ret = fcntl(fd, F_GETFD, 0);
193
214
/* If reading the flags failed, return error indication now. */
194
215
if(ret < 0){
198
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
199
220
}
200
221
201
process *process_list = NULL;
202
222
203
223
/* Mark processes as completed when they exit, and save their exit
204
224
status. */
205
void handle_sigchld(__attribute__((unused)) int sig){
225
static void handle_sigchld(__attribute__((unused)) int sig){
206
226
while(true){
207
process *proc = process_list;
227
plugin *proc = plugin_list;
208
228
int status;
209
229
pid_t pid = waitpid(-1, &status, WNOHANG);
210
230
if(pid == 0){
212
232
break;
213
233
}
214
234
if(pid == -1){
215
if (errno != ECHILD){
235
if(errno != ECHILD){
216
236
perror("waitpid");
217
237
}
218
238
/* No child processes */
219
239
break;
220
240
}
221
241
222
242
/* A child exited, find it in process_list */
223
243
while(proc != NULL and proc->pid != pid){
224
244
proc = proc->next;
232
252
}
233
253
}
234
254
235
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){
236
257
ssize_t ret;
237
if(length>0 and buffer[length-1] == '\n'){
238
length--;
239
}
240
258
for(size_t written = 0; written < length; written += (size_t)ret){
241
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
242
260
length - written));
247
265
return true;
248
266
}
249
267
250
char **add_to_argv(char **argv, int *argc, char *arg){
251
if (argv == NULL){
252
*argc = 1;
253
argv = malloc(sizeof(char*) * 2);
254
if(argv == NULL){
255
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
}
256
292
}
257
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
258
argv[1] = NULL;
259
}
260
*argc += 1;
261
argv = realloc(argv, sizeof(char *)
262
* ((unsigned int) *argc + 1));
263
if(argv == NULL){
264
return NULL;
265
}
266
argv[*argc-1] = arg;
267
argv[*argc] = NULL;
268
return argv;
293
}
294
295
free(plugin_node);
269
296
}
270
297
271
static void free_plugin_list(plugin *plugin_list){
272
for(plugin *next; plugin_list != NULL; plugin_list = next){
273
next = plugin_list->next;
274
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_list->argv);
278
for(char **env = plugin_list->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_list->environ);
282
free(plugin_list);
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
283
301
}
284
302
}
285
303
286
304
int main(int argc, char *argv[]){
287
const char *plugindir = "/lib/mandos/plugins.d";
288
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
289
307
FILE *conffp;
290
308
size_t d_name_len;
291
309
DIR *dir = NULL;
292
310
struct dirent *dirst;
293
311
struct stat st;
294
312
fd_set rfds_all;
295
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
296
316
uid_t uid = 65534;
297
317
gid_t gid = 65534;
298
318
bool debug = false;
323
343
{ .name = "global-options", .key = 'g',
324
344
.arg = "OPTION[,OPTION[,...]]",
325
345
.doc = "Options passed to all plugins" },
326
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
327
347
.arg = "VAR=value",
328
348
.doc = "Environment variable passed to all plugins" },
329
349
{ .name = "options-for", .key = 'o',
330
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
331
351
.doc = "Options passed only to specified plugin" },
332
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
333
353
.arg = "PLUGIN:ENV=value",
334
354
.doc = "Environment variable passed to specified plugin" },
335
355
{ .name = "disable", .key = 'd',
336
356
.arg = "PLUGIN",
337
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
338
361
{ .name = "plugin-dir", .key = 128,
339
362
.arg = "DIRECTORY",
340
363
.doc = "Specify a different plugin directory", .group = 2 },
341
{ .name = "userid", .key = 129,
342
.arg = "ID", .flags = 0,
343
.doc = "User ID the plugins will run as", .group = 2 },
344
{ .name = "groupid", .key = 130,
345
.arg = "ID", .flags = 0,
346
.doc = "Group ID the plugins will run as", .group = 2 },
347
{ .name = "debug", .key = 131,
348
.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 },
349
375
{ .name = NULL }
350
376
};
351
377
352
error_t parse_opt (int key, char *arg, struct argp_state *state) {
353
/* Get the INPUT argument from `argp_parse', which we know is a
354
pointer to our plugin list pointer. */
355
plugin **plugins = state->input;
356
switch (key) {
357
case 'g':
358
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){
359
383
char *p;
360
384
while((p = strsep(&arg, ",")) != NULL){
361
385
if(p[0] == '\0'){
362
386
continue;
363
387
}
364
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
365
389
perror("add_argument");
366
390
return ARGP_ERR_UNKNOWN;
367
391
}
368
392
}
369
393
}
370
394
break;
371
case 'e':
395
case 'G': /* --global-env */
372
396
if(arg == NULL){
373
397
break;
374
398
}
375
{
376
char *envdef = strdup(arg);
377
if(envdef == NULL){
378
break;
379
}
380
if(not add_environment(getplugin(NULL, plugins), envdef)){
381
perror("add_environment");
382
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
383
401
}
384
402
break;
385
case 'o':
386
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
387
405
char *p_name = strsep(&arg, ":");
388
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
389
407
break;
390
408
}
391
409
char *opt = strsep(&arg, ":");
392
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
393
411
break;
394
412
}
395
if(opt != NULL){
396
char *p;
397
while((p = strsep(&opt, ",")) != NULL){
398
if(p[0] == '\0'){
399
continue;
400
}
401
if(not add_argument(getplugin(p_name, plugins), p)){
402
perror("add_argument");
403
return ARGP_ERR_UNKNOWN;
404
}
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;
405
421
}
406
422
}
407
423
}
408
424
break;
409
case 'f':
425
case 'E': /* --env-for */
410
426
if(arg == NULL){
411
427
break;
412
428
}
415
431
if(envdef == NULL){
416
432
break;
417
433
}
418
char *p_name = strndup(arg, (size_t) (envdef-arg));
419
if(p_name == NULL){
420
break;
421
}
422
envdef++;
423
if(not add_environment(getplugin(p_name, plugins), envdef)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
424
436
perror("add_environment");
425
437
}
426
438
}
427
439
break;
428
case 'd':
429
if (arg != NULL){
430
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
431
443
if(p == NULL){
432
444
return ARGP_ERR_UNKNOWN;
433
445
}
434
446
p->disabled = true;
435
447
}
436
448
break;
437
case 128:
438
plugindir = arg;
439
break;
440
case 129:
441
uid = (uid_t)strtol(arg, NULL, 10);
442
break;
443
case 130:
444
gid = (gid_t)strtol(arg, NULL, 10);
445
break;
446
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 */
447
489
debug = true;
448
490
break;
449
case ARGP_KEY_ARG:
450
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
451
break;
452
case ARGP_KEY_END:
453
break;
454
default:
455
return ARGP_ERR_UNKNOWN;
456
}
457
return 0;
458
}
459
460
plugin *plugin_list = NULL;
461
462
struct argp argp = { .options = options, .parser = parse_opt,
463
.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 = "",
464
547
.doc = "Mandos plugin runner -- Run plugins" };
465
548
466
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
467
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){
468
553
fprintf(stderr, "Unknown error while parsing arguments\n");
469
554
exitstatus = EXIT_FAILURE;
470
555
goto fallback;
471
556
}
472
473
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
}
474
567
if(conffp != NULL){
475
568
char *org_line = NULL;
476
569
char *p, *arg, *new_arg, *line;
477
570
size_t size = 0;
478
ssize_t sret;
479
571
const char whitespace_delims[] = " \r\t\f\v\n";
480
572
const char comment_delim[] = "#";
481
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 */
482
586
while(true){
483
587
sret = getline(&org_line, &size, conffp);
484
588
if(sret == -1){
492
596
continue;
493
597
}
494
598
new_arg = strdup(p);
495
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
496
if (custom_argv == NULL){
497
perror("add_to_argv");
498
exitstatus = EXIT_FAILURE;
499
goto fallback;
500
}
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;
501
617
}
502
618
}
503
619
free(org_line);
504
} else{
620
} else {
505
621
/* Check for harmful errors and go to fallback. Other errors might
506
622
not affect opening plugins */
507
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
508
624
perror("fopen");
509
625
exitstatus = EXIT_FAILURE;
510
626
goto fallback;
511
627
}
512
628
}
513
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
514
631
if(custom_argv != NULL){
515
custom_argv[0] = argv[0];
516
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
517
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){
518
635
fprintf(stderr, "Unknown error while parsing arguments\n");
519
636
exitstatus = EXIT_FAILURE;
520
637
goto fallback;
521
638
}
522
639
}
523
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
524
650
if(debug){
525
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
526
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
528
654
for(char **a = p->argv; *a != NULL; a++){
529
655
fprintf(stderr, "\tArg: %s\n", *a);
530
656
}
531
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
532
658
for(char **a = p->environ; *a != NULL; a++){
533
659
fprintf(stderr, "\t%s\n", *a);
534
660
}
535
661
}
536
662
}
537
663
664
/* Strip permissions down to nobody */
538
665
ret = setuid(uid);
539
if (ret == -1){
666
if(ret == -1){
540
667
perror("setuid");
541
}
542
668
}
543
669
setgid(gid);
544
if (ret == -1){
670
if(ret == -1){
545
671
perror("setgid");
546
672
}
547
673
548
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
549
680
if(dir == NULL){
550
681
perror("Could not open plugin dir");
551
682
exitstatus = EXIT_FAILURE;
567
698
568
699
FD_ZERO(&rfds_all);
569
700
701
/* Read and execute any executable in the plugin directory*/
570
702
while(true){
571
703
dirst = readdir(dir);
572
704
573
// All directory entries have been processed
705
/* All directory entries have been processed */
574
706
if(dirst == NULL){
575
if (errno == EBADF){
707
if(errno == EBADF){
576
708
perror("readdir");
577
709
exitstatus = EXIT_FAILURE;
578
710
goto fallback;
582
714
583
715
d_name_len = strlen(dirst->d_name);
584
716
585
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
586
718
{
587
719
bool bad_name = false;
588
720
590
722
591
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
592
724
".dpkg-old",
725
".dpkg-bak",
593
726
".dpkg-divert", NULL };
594
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
595
728
size_t pre_len = strlen(*pre);
603
736
break;
604
737
}
605
738
}
606
607
739
if(bad_name){
608
740
continue;
609
741
}
610
611
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
612
743
size_t suf_len = strlen(*suf);
613
744
if((d_name_len >= suf_len)
628
759
}
629
760
630
761
char *filename;
631
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
}
632
767
if(ret < 0){
633
768
perror("asprintf");
634
769
continue;
635
770
}
636
771
637
772
ret = stat(filename, &st);
638
if (ret == -1){
773
if(ret == -1){
639
774
perror("stat");
640
775
free(filename);
641
776
continue;
642
777
}
643
644
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)){
645
781
if(debug){
646
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
647
783
" with bad type or mode\n", filename);
649
785
free(filename);
650
786
continue;
651
787
}
652
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
653
790
if(p == NULL){
654
791
perror("getplugin");
655
792
free(filename);
665
802
}
666
803
{
667
804
/* Add global arguments to argument list for this plugin */
668
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
669
806
if(g != NULL){
670
807
for(char **a = g->argv + 1; *a != NULL; a++){
671
808
if(not add_argument(p, *a)){
674
811
}
675
812
/* Add global environment variables */
676
813
for(char **e = g->environ; *e != NULL; e++){
677
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
678
815
perror("add_environment");
679
816
}
680
817
}
685
822
process, too. */
686
823
if(p->environ[0] != NULL){
687
824
for(char **e = environ; *e != NULL; e++){
688
char *copy = strdup(*e);
689
if(copy == NULL){
690
perror("strdup");
691
continue;
692
}
693
if(not add_environment(p, copy)){
825
if(not add_environment(p, *e, false)){
694
826
perror("add_environment");
695
827
}
696
828
}
698
830
699
831
int pipefd[2];
700
832
ret = pipe(pipefd);
701
if (ret == -1){
833
if(ret == -1){
702
834
perror("pipe");
703
835
exitstatus = EXIT_FAILURE;
704
836
goto fallback;
705
837
}
838
/* Ask OS to automatic close the pipe on exec */
706
839
ret = set_cloexec_flag(pipefd[0]);
707
840
if(ret < 0){
708
841
perror("set_cloexec_flag");
716
849
goto fallback;
717
850
}
718
851
/* Block SIGCHLD until process is safely in process list */
719
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
720
853
if(ret < 0){
721
854
perror("sigprocmask");
722
855
exitstatus = EXIT_FAILURE;
723
856
goto fallback;
724
857
}
725
// Starting a new process to be watched
858
/* Starting a new process to be watched */
726
859
pid_t pid = fork();
727
860
if(pid == -1){
728
861
perror("fork");
736
869
perror("sigaction");
737
870
_exit(EXIT_FAILURE);
738
871
}
739
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
740
873
if(ret < 0){
741
874
perror("sigprocmask");
742
875
_exit(EXIT_FAILURE);
743
876
}
744
877
745
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
746
879
if(ret == -1){
747
880
perror("dup2");
766
899
}
767
900
/* no return */
768
901
}
769
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
770
904
free(filename);
771
close(pipefd[1]); /* close unused write end of pipe */
772
process *new_process = malloc(sizeof(process));
773
if (new_process == NULL){
774
perror("malloc");
775
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);
776
909
if(ret < 0){
777
perror("sigprocmask");
910
perror("sigprocmask");
778
911
}
779
912
exitstatus = EXIT_FAILURE;
780
913
goto fallback;
781
914
}
782
915
783
*new_process = (struct process){ .pid = pid,
784
.fd = pipefd[0],
785
.next = process_list };
786
// List handling
787
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
788
919
/* Unblock SIGCHLD so signal handler can be run if this process
789
920
has already completed */
790
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
791
922
if(ret < 0){
792
923
perror("sigprocmask");
793
924
exitstatus = EXIT_FAILURE;
794
925
goto fallback;
795
926
}
796
927
797
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
798
929
799
if (maxfd < new_process->fd){
800
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
801
932
}
802
803
933
}
804
934
805
free_plugin_list(plugin_list);
806
plugin_list = NULL;
807
808
935
closedir(dir);
809
936
dir = NULL;
810
811
if (process_list == NULL){
812
fprintf(stderr, "No plugin processes started. Incorrect plugin"
813
" directory?\n");
814
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
}
815
947
}
816
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
817
951
fd_set rfds = rfds_all;
818
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
819
if (select_ret == -1){
953
if(select_ret == -1){
820
954
perror("select");
821
955
exitstatus = EXIT_FAILURE;
822
956
goto fallback;
823
957
}
824
958
/* OK, now either a process completed, or something can be read
825
959
from one of them */
826
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
827
961
/* Is this process completely done? */
828
962
if(proc->eof and proc->completed){
829
963
/* Only accept the plugin output if it exited cleanly */
830
964
if(not WIFEXITED(proc->status)
831
965
or WEXITSTATUS(proc->status) != 0){
832
966
/* Bad exit by plugin */
967
833
968
if(debug){
834
969
if(WIFEXITED(proc->status)){
835
fprintf(stderr, "Plugin %u exited with status %d\n",
836
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
837
972
WEXITSTATUS(proc->status));
838
973
} else if(WIFSIGNALED(proc->status)) {
839
fprintf(stderr, "Plugin %u killed by signal %d\n",
840
(unsigned int) (proc->pid),
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
841
976
WTERMSIG(proc->status));
842
977
} else if(WCOREDUMP(proc->status)){
843
fprintf(stderr, "Plugin %d dumped core\n",
844
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
845
980
}
846
981
}
982
847
983
/* Remove the plugin */
848
984
FD_CLR(proc->fd, &rfds_all);
985
849
986
/* Block signal while modifying process_list */
850
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
851
988
if(ret < 0){
853
990
exitstatus = EXIT_FAILURE;
854
991
goto fallback;
855
992
}
856
/* Delete this process entry from the list */
857
if(process_list == proc){
858
/* First one - simple */
859
process_list = proc->next;
860
} else {
861
/* Second one or later */
862
for(process *p = process_list; p != NULL; p = p->next){
863
if(p->next == proc){
864
p->next = proc->next;
865
break;
866
}
867
}
868
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
869
998
/* We are done modifying process list, so unblock signal */
870
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
871
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
872
1001
if(ret < 0){
873
1002
perror("sigprocmask");
874
}
875
free(proc->buffer);
876
free(proc);
877
/* We deleted this process from the list, so we can't go
878
proc->next. Therefore, start over from the beginning of
879
the process list */
880
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
881
1012
}
1013
882
1014
/* This process exited nicely, so print its buffer */
883
1015
884
1016
bool bret = print_out_password(proc->buffer,
885
1017
proc->buffer_length);
886
1018
if(not bret){
889
1021
}
890
1022
goto fallback;
891
1023
}
1024
892
1025
/* This process has not completed. Does it have any output? */
893
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
894
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
895
1029
continue;
896
1030
}
897
1031
/* Before reading, make the process' data buffer large enough */
898
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
899
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
900
1034
+ (size_t) BUFFER_SIZE);
901
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
902
1036
perror("malloc");
903
1037
exitstatus = EXIT_FAILURE;
904
1038
goto fallback;
906
1040
proc->buffer_size += BUFFER_SIZE;
907
1041
}
908
1042
/* Read from the process */
909
ret = read(proc->fd, proc->buffer + proc->buffer_length,
910
BUFFER_SIZE);
911
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
912
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
913
1048
continue;
914
1049
}
915
if(ret == 0){
1050
if(sret == 0){
916
1051
/* got EOF */
917
1052
proc->eof = true;
918
1053
} else {
919
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
920
1055
}
921
1056
}
922
1057
}
924
1059
925
1060
fallback:
926
1061
927
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
928
1063
/* Fallback if all plugins failed, none are found or an error
929
1064
occured */
930
1065
bool bret;
931
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
932
1067
char *passwordbuffer = getpass("Password: ");
933
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);
934
1075
if(not bret){
935
1076
perror("print_out_password");
936
1077
exitstatus = EXIT_FAILURE;
943
1084
perror("sigaction");
944
1085
exitstatus = EXIT_FAILURE;
945
1086
}
946
1087
947
1088
if(custom_argv != NULL){
948
for(char **arg = custom_argv; *arg != NULL; arg++){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
949
1090
free(*arg);
950
1091
}
951
1092
free(custom_argv);
952
1093
}
953
free_plugin_list(plugin_list);
954
1094
955
1095
if(dir != NULL){
956
1096
closedir(dir);
957
1097
}
958
1098
959
/* Free the process list and kill the processes */
960
for(process *next; process_list != NULL; process_list = next){
961
next = process_list->next;
962
close(process_list->fd);
963
ret = kill(process_list->pid, SIGTERM);
964
if(ret == -1 and errno != ESRCH){
965
/* set-uid proccesses migth not get closed */
966
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
}
967
1108
}
968
free(process_list->buffer);
969
free(process_list);
970
1109
}
971
1110
972
1111
/* Wait for any remaining child processes to terminate */
977
1116
perror("wait");
978
1117
}
979
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
980
1124
return exitstatus;
981
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0