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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:15:43 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205031543-cyd3j09i6iut38w1
* plugin-runner.c (struct plugin.status): Changed type to "int".
(main): Check "proc->completed" before "proc->eof", since
"completed" is of type "sig_atomic_t".
(main): Check "proc->completed" before "proc->eof", since
"completed" is of type "sig_atomic_t".
- 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;
74
75
typedef struct process{
76
pid_t pid;
77
int fd;
78
char *buffer;
79
size_t buffer_size;
80
size_t buffer_length;
81
bool eof;
82
volatile bool completed;
83
volatile int status;
84
struct process *next;
85
} process;
86
87
77
typedef struct plugin{
88
78
char *name; /* can be NULL or any plugin name */
89
79
char **argv;
91
81
char **environ;
92
82
int envc;
93
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 sig_atomic_t completed;
93
int status;
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
*new_plugin = (plugin) { .name = copy_name,
118
.argc = 1,
119
.envc = 0,
120
.disabled = false,
121
.next = *plugin_list };
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
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){
216
perror("waitpid");
235
if(errno == ECHILD){
236
/* No child processes */
237
break;
217
238
}
218
/* No child processes */
219
break;
239
perror("waitpid");
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;
228
248
continue;
229
249
}
230
250
proc->status = status;
231
proc->completed = true;
251
proc->completed = 1;
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
static void free_plugin_list(plugin *plugin_list){
251
for(plugin *next; plugin_list != NULL; plugin_list = next){
252
next = plugin_list->next;
253
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
254
free(*arg);
255
}
256
free(plugin_list->argv);
257
for(char **env = plugin_list->environ; *env != NULL; env++){
258
free(*env);
259
}
260
free(plugin_list->environ);
261
free(plugin_list);
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
}
292
}
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);
262
301
}
263
302
}
264
303
265
304
int main(int argc, char *argv[]){
266
const char *plugindir = "/lib/mandos/plugins.d";
267
const char *argfile = ARGFILE;
305
char *plugindir = NULL;
306
char *argfile = NULL;
268
307
FILE *conffp;
269
308
size_t d_name_len;
270
309
DIR *dir = NULL;
271
310
struct dirent *dirst;
272
311
struct stat st;
273
312
fd_set rfds_all;
274
int ret, maxfd = 0;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
275
316
uid_t uid = 65534;
276
317
gid_t gid = 65534;
277
318
bool debug = false;
302
343
{ .name = "global-options", .key = 'g',
303
344
.arg = "OPTION[,OPTION[,...]]",
304
345
.doc = "Options passed to all plugins" },
305
{ .name = "global-envs", .key = 'e',
346
{ .name = "global-env", .key = 'G',
306
347
.arg = "VAR=value",
307
348
.doc = "Environment variable passed to all plugins" },
308
349
{ .name = "options-for", .key = 'o',
309
350
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
310
351
.doc = "Options passed only to specified plugin" },
311
{ .name = "envs-for", .key = 'f',
352
{ .name = "env-for", .key = 'E',
312
353
.arg = "PLUGIN:ENV=value",
313
354
.doc = "Environment variable passed to specified plugin" },
314
355
{ .name = "disable", .key = 'd',
315
356
.arg = "PLUGIN",
316
357
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
317
361
{ .name = "plugin-dir", .key = 128,
318
362
.arg = "DIRECTORY",
319
363
.doc = "Specify a different plugin directory", .group = 2 },
320
{ .name = "userid", .key = 129,
321
.arg = "ID", .flags = 0,
322
.doc = "User ID the plugins will run as", .group = 2 },
323
{ .name = "groupid", .key = 130,
324
.arg = "ID", .flags = 0,
325
.doc = "Group ID the plugins will run as", .group = 2 },
326
{ .name = "debug", .key = 131,
327
.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 },
328
375
{ .name = NULL }
329
376
};
330
377
331
error_t parse_opt (int key, char *arg, struct argp_state *state) {
332
/* Get the INPUT argument from `argp_parse', which we know is a
333
pointer to our plugin list pointer. */
334
plugin **plugins = state->input;
335
switch (key) {
336
case 'g':
337
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){
338
383
char *p;
339
384
while((p = strsep(&arg, ",")) != NULL){
340
385
if(p[0] == '\0'){
341
386
continue;
342
387
}
343
if(not add_argument(getplugin(NULL, plugins), p)){
388
if(not add_argument(getplugin(NULL), p)){
344
389
perror("add_argument");
345
390
return ARGP_ERR_UNKNOWN;
346
391
}
347
392
}
348
393
}
349
394
break;
350
case 'e':
395
case 'G': /* --global-env */
351
396
if(arg == NULL){
352
397
break;
353
398
}
354
{
355
char *envdef = strdup(arg);
356
if(envdef == NULL){
357
break;
358
}
359
if(not add_environment(getplugin(NULL, plugins), envdef)){
360
perror("add_environment");
361
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
362
401
}
363
402
break;
364
case 'o':
365
if (arg != NULL){
403
case 'o': /* --options-for */
404
if(arg != NULL){
366
405
char *p_name = strsep(&arg, ":");
367
if(p_name[0] == '\0'){
406
if(p_name[0] == '\0' or arg == NULL){
368
407
break;
369
408
}
370
409
char *opt = strsep(&arg, ":");
371
if(opt[0] == '\0'){
410
if(opt[0] == '\0' or opt == NULL){
372
411
break;
373
412
}
374
if(opt != NULL){
375
char *p;
376
while((p = strsep(&opt, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(p_name, plugins), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
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;
384
421
}
385
422
}
386
423
}
387
424
break;
388
case 'f':
425
case 'E': /* --env-for */
389
426
if(arg == NULL){
390
427
break;
391
428
}
394
431
if(envdef == NULL){
395
432
break;
396
433
}
397
char *p_name = strndup(arg, (size_t) (envdef-arg));
398
if(p_name == NULL){
399
break;
400
}
401
envdef++;
402
if(not add_environment(getplugin(p_name, plugins), envdef)){
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
403
436
perror("add_environment");
404
437
}
405
438
}
406
439
break;
407
case 'd':
408
if (arg != NULL){
409
plugin *p = getplugin(arg, plugins);
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
410
443
if(p == NULL){
411
444
return ARGP_ERR_UNKNOWN;
412
445
}
413
446
p->disabled = true;
414
447
}
415
448
break;
416
case 128:
417
plugindir = arg;
418
break;
419
case 129:
420
uid = (uid_t)strtol(arg, NULL, 10);
421
break;
422
case 130:
423
gid = (gid_t)strtol(arg, NULL, 10);
424
break;
425
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 */
426
489
debug = true;
427
490
break;
428
case ARGP_KEY_ARG:
429
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
430
break;
431
case ARGP_KEY_END:
432
break;
433
default:
434
return ARGP_ERR_UNKNOWN;
435
}
436
return 0;
437
}
438
439
plugin *plugin_list = NULL;
440
441
struct argp argp = { .options = options, .parser = parse_opt,
442
.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 = "",
443
547
.doc = "Mandos plugin runner -- Run plugins" };
444
548
445
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
446
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){
447
553
fprintf(stderr, "Unknown error while parsing arguments\n");
448
554
exitstatus = EXIT_FAILURE;
449
555
goto fallback;
450
556
}
451
452
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
}
453
567
if(conffp != NULL){
454
568
char *org_line = NULL;
455
569
char *p, *arg, *new_arg, *line;
456
570
size_t size = 0;
457
ssize_t sret;
458
571
const char whitespace_delims[] = " \r\t\f\v\n";
459
572
const char comment_delim[] = "#";
460
573
467
580
}
468
581
custom_argv[0] = argv[0];
469
582
custom_argv[1] = NULL;
470
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
471
586
while(true){
472
587
sret = getline(&org_line, &size, conffp);
473
588
if(sret == -1){
481
596
continue;
482
597
}
483
598
new_arg = strdup(p);
484
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
485
606
custom_argc += 1;
486
607
custom_argv = realloc(custom_argv, sizeof(char *)
487
608
* ((unsigned int) custom_argc + 1));
496
617
}
497
618
}
498
619
free(org_line);
499
} else{
620
} else {
500
621
/* Check for harmful errors and go to fallback. Other errors might
501
622
not affect opening plugins */
502
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
503
624
perror("fopen");
504
625
exitstatus = EXIT_FAILURE;
505
626
goto fallback;
506
627
}
507
628
}
508
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
509
631
if(custom_argv != NULL){
510
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
511
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){
512
635
fprintf(stderr, "Unknown error while parsing arguments\n");
513
636
exitstatus = EXIT_FAILURE;
514
637
goto fallback;
515
638
}
516
639
}
517
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
518
650
if(debug){
519
651
for(plugin *p = plugin_list; p != NULL; p=p->next){
520
652
fprintf(stderr, "Plugin: %s has %d arguments\n",
522
654
for(char **a = p->argv; *a != NULL; a++){
523
655
fprintf(stderr, "\tArg: %s\n", *a);
524
656
}
525
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
526
658
for(char **a = p->environ; *a != NULL; a++){
527
659
fprintf(stderr, "\t%s\n", *a);
528
660
}
529
661
}
530
662
}
531
663
664
/* Strip permissions down to nobody */
532
665
ret = setuid(uid);
533
if (ret == -1){
666
if(ret == -1){
534
667
perror("setuid");
535
}
536
668
}
537
669
setgid(gid);
538
if (ret == -1){
670
if(ret == -1){
539
671
perror("setgid");
540
672
}
541
673
542
dir = opendir(plugindir);
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
543
680
if(dir == NULL){
544
681
perror("Could not open plugin dir");
545
682
exitstatus = EXIT_FAILURE;
561
698
562
699
FD_ZERO(&rfds_all);
563
700
701
/* Read and execute any executable in the plugin directory*/
564
702
while(true){
565
703
dirst = readdir(dir);
566
704
567
// All directory entries have been processed
705
/* All directory entries have been processed */
568
706
if(dirst == NULL){
569
if (errno == EBADF){
707
if(errno == EBADF){
570
708
perror("readdir");
571
709
exitstatus = EXIT_FAILURE;
572
710
goto fallback;
576
714
577
715
d_name_len = strlen(dirst->d_name);
578
716
579
// Ignore dotfiles, backup files and other junk
717
/* Ignore dotfiles, backup files and other junk */
580
718
{
581
719
bool bad_name = false;
582
720
584
722
585
723
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
586
724
".dpkg-old",
725
".dpkg-bak",
587
726
".dpkg-divert", NULL };
588
727
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
589
728
size_t pre_len = strlen(*pre);
597
736
break;
598
737
}
599
738
}
600
601
739
if(bad_name){
602
740
continue;
603
741
}
604
605
742
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
606
743
size_t suf_len = strlen(*suf);
607
744
if((d_name_len >= suf_len)
622
759
}
623
760
624
761
char *filename;
625
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
}
626
767
if(ret < 0){
627
768
perror("asprintf");
628
769
continue;
629
770
}
630
771
631
772
ret = stat(filename, &st);
632
if (ret == -1){
773
if(ret == -1){
633
774
perror("stat");
634
775
free(filename);
635
776
continue;
636
777
}
637
638
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)){
639
781
if(debug){
640
782
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
641
783
" with bad type or mode\n", filename);
643
785
free(filename);
644
786
continue;
645
787
}
646
plugin *p = getplugin(dirst->d_name, &plugin_list);
788
789
plugin *p = getplugin(dirst->d_name);
647
790
if(p == NULL){
648
791
perror("getplugin");
649
792
free(filename);
659
802
}
660
803
{
661
804
/* Add global arguments to argument list for this plugin */
662
plugin *g = getplugin(NULL, &plugin_list);
805
plugin *g = getplugin(NULL);
663
806
if(g != NULL){
664
807
for(char **a = g->argv + 1; *a != NULL; a++){
665
808
if(not add_argument(p, *a)){
668
811
}
669
812
/* Add global environment variables */
670
813
for(char **e = g->environ; *e != NULL; e++){
671
if(not add_environment(p, *e)){
814
if(not add_environment(p, *e, false)){
672
815
perror("add_environment");
673
816
}
674
817
}
679
822
process, too. */
680
823
if(p->environ[0] != NULL){
681
824
for(char **e = environ; *e != NULL; e++){
682
char *copy = strdup(*e);
683
if(copy == NULL){
684
perror("strdup");
685
continue;
686
}
687
if(not add_environment(p, copy)){
825
if(not add_environment(p, *e, false)){
688
826
perror("add_environment");
689
827
}
690
828
}
692
830
693
831
int pipefd[2];
694
832
ret = pipe(pipefd);
695
if (ret == -1){
833
if(ret == -1){
696
834
perror("pipe");
697
835
exitstatus = EXIT_FAILURE;
698
836
goto fallback;
699
837
}
838
/* Ask OS to automatic close the pipe on exec */
700
839
ret = set_cloexec_flag(pipefd[0]);
701
840
if(ret < 0){
702
841
perror("set_cloexec_flag");
710
849
goto fallback;
711
850
}
712
851
/* Block SIGCHLD until process is safely in process list */
713
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
714
853
if(ret < 0){
715
854
perror("sigprocmask");
716
855
exitstatus = EXIT_FAILURE;
717
856
goto fallback;
718
857
}
719
// Starting a new process to be watched
858
/* Starting a new process to be watched */
720
859
pid_t pid = fork();
721
860
if(pid == -1){
722
861
perror("fork");
730
869
perror("sigaction");
731
870
_exit(EXIT_FAILURE);
732
871
}
733
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
734
873
if(ret < 0){
735
874
perror("sigprocmask");
736
875
_exit(EXIT_FAILURE);
737
876
}
738
877
739
878
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
740
879
if(ret == -1){
741
880
perror("dup2");
760
899
}
761
900
/* no return */
762
901
}
763
/* parent process */
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
764
904
free(filename);
765
close(pipefd[1]); /* close unused write end of pipe */
766
process *new_process = malloc(sizeof(process));
767
if (new_process == NULL){
768
perror("malloc");
769
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);
770
909
if(ret < 0){
771
perror("sigprocmask");
910
perror("sigprocmask");
772
911
}
773
912
exitstatus = EXIT_FAILURE;
774
913
goto fallback;
775
914
}
776
915
777
*new_process = (struct process){ .pid = pid,
778
.fd = pipefd[0],
779
.next = process_list };
780
// List handling
781
process_list = new_process;
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
782
919
/* Unblock SIGCHLD so signal handler can be run if this process
783
920
has already completed */
784
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
785
922
if(ret < 0){
786
923
perror("sigprocmask");
787
924
exitstatus = EXIT_FAILURE;
788
925
goto fallback;
789
926
}
790
927
791
FD_SET(new_process->fd, &rfds_all);
928
FD_SET(new_plugin->fd, &rfds_all);
792
929
793
if (maxfd < new_process->fd){
794
maxfd = new_process->fd;
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
795
932
}
796
797
933
}
798
934
799
free_plugin_list(plugin_list);
800
plugin_list = NULL;
801
802
935
closedir(dir);
803
936
dir = NULL;
804
805
if (process_list == NULL){
806
fprintf(stderr, "No plugin processes started. Incorrect plugin"
807
" directory?\n");
808
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
}
809
947
}
810
while(process_list){
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
811
951
fd_set rfds = rfds_all;
812
952
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
813
if (select_ret == -1){
953
if(select_ret == -1){
814
954
perror("select");
815
955
exitstatus = EXIT_FAILURE;
816
956
goto fallback;
817
957
}
818
958
/* OK, now either a process completed, or something can be read
819
959
from one of them */
820
for(process *proc = process_list; proc ; proc = proc->next){
960
for(plugin *proc = plugin_list; proc != NULL;){
821
961
/* Is this process completely done? */
822
if(proc->eof and proc->completed){
962
if(proc->completed and proc->eof){
823
963
/* Only accept the plugin output if it exited cleanly */
824
964
if(not WIFEXITED(proc->status)
825
965
or WEXITSTATUS(proc->status) != 0){
826
966
/* Bad exit by plugin */
967
827
968
if(debug){
828
969
if(WIFEXITED(proc->status)){
829
fprintf(stderr, "Plugin %u exited with status %d\n",
830
(unsigned int) (proc->pid),
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
831
972
WEXITSTATUS(proc->status));
832
} else if(WIFSIGNALED(proc->status)) {
833
fprintf(stderr, "Plugin %u killed by signal %d\n",
834
(unsigned int) (proc->pid),
973
} else if(WIFSIGNALED(proc->status)){
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
835
976
WTERMSIG(proc->status));
836
977
} else if(WCOREDUMP(proc->status)){
837
fprintf(stderr, "Plugin %d dumped core\n",
838
(unsigned int) (proc->pid));
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
839
980
}
840
981
}
982
841
983
/* Remove the plugin */
842
984
FD_CLR(proc->fd, &rfds_all);
985
843
986
/* Block signal while modifying process_list */
844
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
845
988
if(ret < 0){
847
990
exitstatus = EXIT_FAILURE;
848
991
goto fallback;
849
992
}
850
/* Delete this process entry from the list */
851
if(process_list == proc){
852
/* First one - simple */
853
process_list = proc->next;
854
} else {
855
/* Second one or later */
856
for(process *p = process_list; p != NULL; p = p->next){
857
if(p->next == proc){
858
p->next = proc->next;
859
break;
860
}
861
}
862
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
863
998
/* We are done modifying process list, so unblock signal */
864
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
865
NULL);
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
866
1001
if(ret < 0){
867
1002
perror("sigprocmask");
868
}
869
free(proc->buffer);
870
free(proc);
871
/* We deleted this process from the list, so we can't go
872
proc->next. Therefore, start over from the beginning of
873
the process list */
874
break;
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
875
1012
}
1013
876
1014
/* This process exited nicely, so print its buffer */
877
1015
878
1016
bool bret = print_out_password(proc->buffer,
879
1017
proc->buffer_length);
880
1018
if(not bret){
883
1021
}
884
1022
goto fallback;
885
1023
}
1024
886
1025
/* This process has not completed. Does it have any output? */
887
1026
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
888
1027
/* This process had nothing to say at this time */
1028
proc = proc->next;
889
1029
continue;
890
1030
}
891
1031
/* Before reading, make the process' data buffer large enough */
892
1032
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
893
1033
proc->buffer = realloc(proc->buffer, proc->buffer_size
894
1034
+ (size_t) BUFFER_SIZE);
895
if (proc->buffer == NULL){
1035
if(proc->buffer == NULL){
896
1036
perror("malloc");
897
1037
exitstatus = EXIT_FAILURE;
898
1038
goto fallback;
900
1040
proc->buffer_size += BUFFER_SIZE;
901
1041
}
902
1042
/* Read from the process */
903
ret = read(proc->fd, proc->buffer + proc->buffer_length,
904
BUFFER_SIZE);
905
if(ret < 0){
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
906
1046
/* Read error from this process; ignore the error */
1047
proc = proc->next;
907
1048
continue;
908
1049
}
909
if(ret == 0){
1050
if(sret == 0){
910
1051
/* got EOF */
911
1052
proc->eof = true;
912
1053
} else {
913
proc->buffer_length += (size_t) ret;
1054
proc->buffer_length += (size_t) sret;
914
1055
}
915
1056
}
916
1057
}
918
1059
919
1060
fallback:
920
1061
921
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
922
1063
/* Fallback if all plugins failed, none are found or an error
923
1064
occured */
924
1065
bool bret;
925
1066
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
926
1067
char *passwordbuffer = getpass("Password: ");
927
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);
928
1075
if(not bret){
929
1076
perror("print_out_password");
930
1077
exitstatus = EXIT_FAILURE;
937
1084
perror("sigaction");
938
1085
exitstatus = EXIT_FAILURE;
939
1086
}
940
1087
941
1088
if(custom_argv != NULL){
942
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
943
1090
free(*arg);
944
1091
}
945
1092
free(custom_argv);
946
1093
}
947
free_plugin_list(plugin_list);
948
1094
949
1095
if(dir != NULL){
950
1096
closedir(dir);
951
1097
}
952
1098
953
/* Free the process list and kill the processes */
954
for(process *next; process_list != NULL; process_list = next){
955
next = process_list->next;
956
close(process_list->fd);
957
ret = kill(process_list->pid, SIGTERM);
958
if(ret == -1 and errno != ESRCH){
959
/* set-uid proccesses migth not get closed */
960
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
}
961
1108
}
962
free(process_list->buffer);
963
free(process_list);
964
1109
}
965
1110
966
1111
/* Wait for any remaining child processes to terminate */
971
1116
perror("wait");
972
1117
}
973
1118
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
974
1124
return exitstatus;
975
1125
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0