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- Committer: Björn Påhlsson
- Date: 2008-08-24 10:55:21 UTC
- mfrom: (100 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 102.
- Revision ID: belorn@braxen-20080824105521-k7g7hi13rn0c9wsc
merge
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
28
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
29
28
EXIT_SUCCESS, realloc() */
30
29
#include <stdbool.h> /* bool, true, false */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
33
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
34
33
stat, waitpid(), WIFEXITED(),
35
34
WEXITSTATUS(), wait(), pid_t,
47
46
fcntl(), setuid(), setgid(),
48
47
F_GETFD, F_SETFD, FD_CLOEXEC,
49
48
access(), pipe(), fork(), close()
50
dup2(), STDOUT_FILENO, _exit(),
49
dup2, STDOUT_FILENO, _exit(),
51
50
execv(), write(), read(),
52
51
close() */
53
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
57
56
#include <argp.h> /* struct argp_option, struct
58
57
argp_state, struct argp,
59
58
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
62
60
#include <signal.h> /* struct sigaction, sigemptyset(),
63
61
sigaddset(), sigaction(),
64
62
sigprocmask(), SIG_BLOCK, SIGCHLD,
65
63
SIG_UNBLOCK, kill() */
66
64
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
68
65
69
66
#define BUFFER_SIZE 256
70
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
67
#define ARGFILE "/conf/conf.d/mandos/plugin-runner.conf"
68
69
const char *argp_program_version = "plugin-runner 1.0";
75
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
76
71
72
struct process;
73
74
typedef struct process{
75
pid_t pid;
76
int fd;
77
char *buffer;
78
size_t buffer_size;
79
size_t buffer_length;
80
bool eof;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
77
86
typedef struct plugin{
78
87
char *name; /* can be NULL or any plugin name */
79
88
char **argv;
81
90
char **environ;
82
91
int envc;
83
92
bool disabled;
84
85
/* Variables used for running processes*/
86
pid_t pid;
87
int fd;
88
char *buffer;
89
size_t buffer_size;
90
size_t buffer_length;
91
bool eof;
92
volatile bool completed;
93
volatile int status;
94
93
struct plugin *next;
95
94
} plugin;
96
95
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for(plugin *p = plugin_list; p != NULL; p = p->next){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
96
static plugin *getplugin(char *name, plugin **plugin_list){
97
for (plugin *p = *plugin_list; p != NULL; p = p->next){
98
if ((p->name == name)
99
or (p->name and name and (strcmp(p->name, name) == 0))){
106
100
return p;
107
101
}
108
102
}
109
103
/* Create a new plugin */
110
104
plugin *new_plugin = malloc(sizeof(plugin));
111
if(new_plugin == NULL){
105
if (new_plugin == NULL){
112
106
return NULL;
113
107
}
114
108
char *copy_name = NULL;
115
109
if(name != NULL){
116
110
copy_name = strdup(name);
117
111
if(copy_name == NULL){
118
free(new_plugin);
119
112
return NULL;
120
113
}
121
114
}
122
115
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
116
*new_plugin = (plugin) { .name = copy_name,
117
.argc = 1,
118
.envc = 0,
119
.disabled = false,
120
.next = *plugin_list };
127
121
128
122
new_plugin->argv = malloc(sizeof(char *) * 2);
129
if(new_plugin->argv == NULL){
123
if (new_plugin->argv == NULL){
130
124
free(copy_name);
131
125
free(new_plugin);
132
126
return NULL;
133
127
}
134
128
new_plugin->argv[0] = copy_name;
135
129
new_plugin->argv[1] = NULL;
136
130
137
131
new_plugin->environ = malloc(sizeof(char *));
138
132
if(new_plugin->environ == NULL){
139
133
free(copy_name);
142
136
return NULL;
143
137
}
144
138
new_plugin->environ[0] = NULL;
145
146
139
/* Append the new plugin to the list */
147
plugin_list = new_plugin;
140
*plugin_list = new_plugin;
148
141
return new_plugin;
149
142
}
150
143
180
173
}
181
174
182
175
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
176
static bool add_environment(plugin *p, const char *def){
184
177
if(p == NULL){
185
178
return false;
186
179
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
180
return add_to_char_array(def, &(p->environ), &(p->envc));
205
181
}
206
182
183
207
184
/*
208
185
* Based on the example in the GNU LibC manual chapter 13.13 "File
209
186
* Descriptor Flags".
210
187
* *Note File Descriptor Flags:(libc)Descriptor Flags.
211
188
*/
212
static int set_cloexec_flag(int fd){
189
static int set_cloexec_flag(int fd)
190
{
213
191
int ret = fcntl(fd, F_GETFD, 0);
214
192
/* If reading the flags failed, return error indication now. */
215
193
if(ret < 0){
219
197
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
198
}
221
199
200
process *process_list = NULL;
222
201
223
/* Mark processes as completed when they exit, and save their exit
202
/* Mark a process as completed when it exits, and save its exit
224
203
status. */
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if(errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
204
void handle_sigchld(__attribute__((unused)) int sig){
205
process *proc = process_list;
206
int status;
207
pid_t pid = wait(&status);
208
if(pid == -1){
209
perror("wait");
210
return;
211
}
212
while(proc != NULL and proc->pid != pid){
213
proc = proc->next;
214
}
215
if(proc == NULL){
216
/* Process not found in process list */
217
return;
218
}
219
proc->status = status;
220
proc->completed = true;
253
221
}
254
222
255
/* Prints out a password to stdout */
256
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
257
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
258
228
for(size_t written = 0; written < length; written += (size_t)ret){
259
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
260
230
length - written));
265
235
return true;
266
236
}
267
237
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
}
238
char **add_to_argv(char **argv, int *argc, char *arg){
239
if (argv == NULL){
240
*argc = 1;
241
argv = malloc(sizeof(char*) * 2);
242
if(argv == NULL){
243
return NULL;
292
244
}
293
}
294
295
free(plugin_node);
245
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
246
argv[1] = NULL;
247
}
248
*argc += 1;
249
argv = realloc(argv, sizeof(char *)
250
* ((unsigned int) *argc + 1));
251
if(argv == NULL){
252
return NULL;
253
}
254
argv[*argc-1] = arg;
255
argv[*argc] = NULL;
256
return argv;
296
257
}
297
258
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
263
free(*arg);
264
}
265
free(plugin_list->argv);
266
for(char **env = plugin_list->environ; *env != NULL; env++){
267
free(*env);
268
}
269
free(plugin_list->environ);
270
free(plugin_list);
301
271
}
302
272
}
303
273
304
274
int main(int argc, char *argv[]){
305
char *plugindir = NULL;
306
char *argfile = NULL;
275
const char *plugindir = "/lib/mandos/plugins.d";
276
const char *argfile = ARGFILE;
307
277
FILE *conffp;
308
278
size_t d_name_len;
309
279
DIR *dir = NULL;
310
280
struct dirent *dirst;
311
281
struct stat st;
312
282
fd_set rfds_all;
313
int ret, numchars, maxfd = 0;
314
ssize_t sret;
315
intmax_t tmpmax;
283
int ret, maxfd = 0;
316
284
uid_t uid = 65534;
317
285
gid_t gid = 65534;
318
286
bool debug = false;
343
311
{ .name = "global-options", .key = 'g',
344
312
.arg = "OPTION[,OPTION[,...]]",
345
313
.doc = "Options passed to all plugins" },
346
{ .name = "global-env", .key = 'G',
314
{ .name = "global-envs", .key = 'e',
347
315
.arg = "VAR=value",
348
316
.doc = "Environment variable passed to all plugins" },
349
317
{ .name = "options-for", .key = 'o',
350
318
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
351
319
.doc = "Options passed only to specified plugin" },
352
{ .name = "env-for", .key = 'E',
320
{ .name = "envs-for", .key = 'f',
353
321
.arg = "PLUGIN:ENV=value",
354
322
.doc = "Environment variable passed to specified plugin" },
355
323
{ .name = "disable", .key = 'd',
356
324
.arg = "PLUGIN",
357
325
.doc = "Disable a specific plugin", .group = 1 },
358
{ .name = "enable", .key = 'e',
359
.arg = "PLUGIN",
360
.doc = "Enable a specific plugin", .group = 1 },
361
326
{ .name = "plugin-dir", .key = 128,
362
327
.arg = "DIRECTORY",
363
328
.doc = "Specify a different plugin directory", .group = 2 },
364
{ .name = "config-file", .key = 129,
365
.arg = "FILE",
366
.doc = "Specify a different configuration file", .group = 2 },
367
{ .name = "userid", .key = 130,
368
.arg = "ID", .flags = 0,
369
.doc = "User ID the plugins will run as", .group = 3 },
370
{ .name = "groupid", .key = 131,
371
.arg = "ID", .flags = 0,
372
.doc = "Group ID the plugins will run as", .group = 3 },
373
{ .name = "debug", .key = 132,
374
.doc = "Debug mode", .group = 4 },
329
{ .name = "userid", .key = 129,
330
.arg = "ID", .flags = 0,
331
.doc = "User ID the plugins will run as", .group = 2 },
332
{ .name = "groupid", .key = 130,
333
.arg = "ID", .flags = 0,
334
.doc = "Group ID the plugins will run as", .group = 2 },
335
{ .name = "debug", .key = 131,
336
.doc = "Debug mode", .group = 3 },
375
337
{ .name = NULL }
376
338
};
377
339
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){
340
error_t parse_opt (int key, char *arg, struct argp_state *state) {
341
/* Get the INPUT argument from `argp_parse', which we know is a
342
pointer to our plugin list pointer. */
343
plugin **plugins = state->input;
344
switch (key) {
345
case 'g':
346
if (arg != NULL){
383
347
char *p;
384
348
while((p = strsep(&arg, ",")) != NULL){
385
349
if(p[0] == '\0'){
386
350
continue;
387
351
}
388
if(not add_argument(getplugin(NULL), p)){
352
if(not add_argument(getplugin(NULL, plugins), p)){
389
353
perror("add_argument");
390
354
return ARGP_ERR_UNKNOWN;
391
355
}
392
356
}
393
357
}
394
358
break;
395
case 'G': /* --global-env */
359
case 'e':
396
360
if(arg == NULL){
397
361
break;
398
362
}
399
if(not add_environment(getplugin(NULL), arg, true)){
400
perror("add_environment");
363
{
364
char *envdef = strdup(arg);
365
if(envdef == NULL){
366
break;
367
}
368
if(not add_environment(getplugin(NULL, plugins), envdef)){
369
perror("add_environment");
370
}
401
371
}
402
372
break;
403
case 'o': /* --options-for */
404
if(arg != NULL){
373
case 'o':
374
if (arg != NULL){
405
375
char *p_name = strsep(&arg, ":");
406
if(p_name[0] == '\0' or arg == NULL){
376
if(p_name[0] == '\0'){
407
377
break;
408
378
}
409
379
char *opt = strsep(&arg, ":");
410
if(opt[0] == '\0' or opt == NULL){
380
if(opt[0] == '\0'){
411
381
break;
412
382
}
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;
383
if(opt != NULL){
384
char *p;
385
while((p = strsep(&opt, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(p_name, plugins), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
421
393
}
422
394
}
423
395
}
424
396
break;
425
case 'E': /* --env-for */
397
case 'f':
426
398
if(arg == NULL){
427
399
break;
428
400
}
431
403
if(envdef == NULL){
432
404
break;
433
405
}
434
*envdef = '\0';
435
if(not add_environment(getplugin(arg), envdef+1, true)){
406
char *p_name = strndup(arg, (size_t) (envdef-arg));
407
if(p_name == NULL){
408
break;
409
}
410
envdef++;
411
if(not add_environment(getplugin(p_name, plugins), envdef)){
436
412
perror("add_environment");
437
413
}
438
414
}
439
415
break;
440
case 'd': /* --disable */
441
if(arg != NULL){
442
plugin *p = getplugin(arg);
416
case 'd':
417
if (arg != NULL){
418
plugin *p = getplugin(arg, plugins);
443
419
if(p == NULL){
444
420
return ARGP_ERR_UNKNOWN;
445
421
}
446
422
p->disabled = true;
447
423
}
448
424
break;
449
case 'e': /* --enable */
450
if(arg != NULL){
451
plugin *p = getplugin(arg);
452
if(p == NULL){
453
return ARGP_ERR_UNKNOWN;
454
}
455
p->disabled = false;
456
}
457
break;
458
case 128: /* --plugin-dir */
459
free(plugindir);
460
plugindir = strdup(arg);
461
if(plugindir == NULL){
462
perror("strdup");
463
}
464
break;
465
case 129: /* --config-file */
466
/* This is already done by parse_opt_config_file() */
467
break;
468
case 130: /* --userid */
469
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
470
if(ret < 1 or tmpmax != (uid_t)tmpmax
471
or arg[numchars] != '\0'){
472
fprintf(stderr, "Bad user ID number: \"%s\", using %"
473
PRIdMAX "\n", arg, (intmax_t)uid);
474
} else {
475
uid = (uid_t)tmpmax;
476
}
477
break;
478
case 131: /* --groupid */
479
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
480
if(ret < 1 or tmpmax != (gid_t)tmpmax
481
or arg[numchars] != '\0'){
482
fprintf(stderr, "Bad group ID number: \"%s\", using %"
483
PRIdMAX "\n", arg, (intmax_t)gid);
484
} else {
485
gid = (gid_t)tmpmax;
486
}
487
break;
488
case 132: /* --debug */
425
case 128:
426
plugindir = arg;
427
break;
428
case 129:
429
uid = (uid_t)strtol(arg, NULL, 10);
430
break;
431
case 130:
432
gid = (gid_t)strtol(arg, NULL, 10);
433
break;
434
case 131:
489
435
debug = true;
490
436
break;
491
/*
492
* When adding more options before this line, remember to also add a
493
* "case" to the "parse_opt_config_file" function below.
494
*/
495
case ARGP_KEY_ARG:
496
/* Cryptsetup always passes an argument, which is an empty
497
string if "none" was specified in /etc/crypttab. So if
498
argument was empty, we ignore it silently. */
499
if(arg[0] != '\0'){
500
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
501
}
502
break;
503
case ARGP_KEY_END:
504
break;
505
default:
506
return ARGP_ERR_UNKNOWN;
507
}
508
return 0;
509
}
510
511
/* This option parser is the same as parse_opt() above, except it
512
ignores everything but the --config-file option. */
513
error_t parse_opt_config_file(int key, char *arg,
514
__attribute__((unused))
515
struct argp_state *state){
516
switch(key){
517
case 'g': /* --global-options */
518
case 'G': /* --global-env */
519
case 'o': /* --options-for */
520
case 'E': /* --env-for */
521
case 'd': /* --disable */
522
case 'e': /* --enable */
523
case 128: /* --plugin-dir */
524
break;
525
case 129: /* --config-file */
526
free(argfile);
527
argfile = strdup(arg);
528
if(argfile == NULL){
529
perror("strdup");
530
}
531
break;
532
case 130: /* --userid */
533
case 131: /* --groupid */
534
case 132: /* --debug */
535
case ARGP_KEY_ARG:
536
case ARGP_KEY_END:
537
break;
538
default:
539
return ARGP_ERR_UNKNOWN;
540
}
541
return 0;
542
}
543
544
struct argp argp = { .options = options,
545
.parser = parse_opt_config_file,
546
.args_doc = "",
437
case ARGP_KEY_ARG:
438
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
439
break;
440
case ARGP_KEY_END:
441
break;
442
default:
443
return ARGP_ERR_UNKNOWN;
444
}
445
return 0;
446
}
447
448
plugin *plugin_list = NULL;
449
450
struct argp argp = { .options = options, .parser = parse_opt,
451
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
547
452
.doc = "Mandos plugin runner -- Run plugins" };
548
453
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){
454
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
455
if (ret == ARGP_ERR_UNKNOWN){
553
456
fprintf(stderr, "Unknown error while parsing arguments\n");
554
457
exitstatus = EXIT_FAILURE;
555
458
goto fallback;
556
459
}
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
}
460
461
conffp = fopen(argfile, "r");
567
462
if(conffp != NULL){
568
463
char *org_line = NULL;
569
464
char *p, *arg, *new_arg, *line;
570
465
size_t size = 0;
466
ssize_t sret;
571
467
const char whitespace_delims[] = " \r\t\f\v\n";
572
468
const char comment_delim[] = "#";
573
469
574
custom_argc = 1;
575
custom_argv = malloc(sizeof(char*) * 2);
576
if(custom_argv == NULL){
577
perror("malloc");
578
exitstatus = EXIT_FAILURE;
579
goto fallback;
580
}
581
custom_argv[0] = argv[0];
582
custom_argv[1] = NULL;
583
584
/* for each line in the config file, strip whitespace and ignore
585
commented text */
586
470
while(true){
587
471
sret = getline(&org_line, &size, conffp);
588
472
if(sret == -1){
596
480
continue;
597
481
}
598
482
new_arg = strdup(p);
599
if(new_arg == NULL){
600
perror("strdup");
601
exitstatus = EXIT_FAILURE;
602
free(org_line);
603
goto fallback;
604
}
605
606
custom_argc += 1;
607
custom_argv = realloc(custom_argv, sizeof(char *)
608
* ((unsigned int) custom_argc + 1));
609
if(custom_argv == NULL){
610
perror("realloc");
611
exitstatus = EXIT_FAILURE;
612
free(org_line);
613
goto fallback;
614
}
615
custom_argv[custom_argc-1] = new_arg;
616
custom_argv[custom_argc] = NULL;
483
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
484
if (custom_argv == NULL){
485
perror("add_to_argv");
486
exitstatus = EXIT_FAILURE;
487
goto fallback;
488
}
617
489
}
618
490
}
619
491
free(org_line);
620
} else {
492
} else{
621
493
/* Check for harmful errors and go to fallback. Other errors might
622
494
not affect opening plugins */
623
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
495
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
624
496
perror("fopen");
625
497
exitstatus = EXIT_FAILURE;
626
498
goto fallback;
627
499
}
628
500
}
629
/* If there was any arguments from configuration file,
630
pass them to parser as command arguments */
501
631
502
if(custom_argv != NULL){
632
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
633
0, NULL);
634
if(ret == ARGP_ERR_UNKNOWN){
503
custom_argv[0] = argv[0];
504
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
505
if (ret == ARGP_ERR_UNKNOWN){
635
506
fprintf(stderr, "Unknown error while parsing arguments\n");
636
507
exitstatus = EXIT_FAILURE;
637
508
goto fallback;
638
509
}
639
510
}
640
511
641
/* Parse actual command line arguments, to let them override the
642
config file */
643
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
644
if(ret == ARGP_ERR_UNKNOWN){
645
fprintf(stderr, "Unknown error while parsing arguments\n");
646
exitstatus = EXIT_FAILURE;
647
goto fallback;
648
}
649
650
512
if(debug){
651
513
for(plugin *p = plugin_list; p != NULL; p=p->next){
652
514
fprintf(stderr, "Plugin: %s has %d arguments\n",
654
516
for(char **a = p->argv; *a != NULL; a++){
655
517
fprintf(stderr, "\tArg: %s\n", *a);
656
518
}
657
fprintf(stderr, "...and %d environment variables\n", p->envc);
519
fprintf(stderr, "...and %u environment variables\n", p->envc);
658
520
for(char **a = p->environ; *a != NULL; a++){
659
521
fprintf(stderr, "\t%s\n", *a);
660
522
}
661
523
}
662
524
}
663
525
664
/* Strip permissions down to nobody */
665
526
ret = setuid(uid);
666
if(ret == -1){
527
if (ret == -1){
667
528
perror("setuid");
668
}
529
}
530
669
531
setgid(gid);
670
if(ret == -1){
532
if (ret == -1){
671
533
perror("setgid");
672
534
}
673
535
674
if(plugindir == NULL){
675
dir = opendir(PDIR);
676
} else {
677
dir = opendir(plugindir);
678
}
679
536
dir = opendir(plugindir);
680
537
if(dir == NULL){
681
538
perror("Could not open plugin dir");
682
539
exitstatus = EXIT_FAILURE;
698
555
699
556
FD_ZERO(&rfds_all);
700
557
701
/* Read and execute any executable in the plugin directory*/
702
558
while(true){
703
559
dirst = readdir(dir);
704
560
705
/* All directory entries have been processed */
561
// All directory entries have been processed
706
562
if(dirst == NULL){
707
if(errno == EBADF){
563
if (errno == EBADF){
708
564
perror("readdir");
709
565
exitstatus = EXIT_FAILURE;
710
566
goto fallback;
714
570
715
571
d_name_len = strlen(dirst->d_name);
716
572
717
/* Ignore dotfiles, backup files and other junk */
573
// Ignore dotfiles, backup files and other junk
718
574
{
719
575
bool bad_name = false;
720
576
722
578
723
579
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
724
580
".dpkg-old",
725
".dpkg-bak",
726
581
".dpkg-divert", NULL };
727
582
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
728
583
size_t pre_len = strlen(*pre);
736
591
break;
737
592
}
738
593
}
594
739
595
if(bad_name){
740
596
continue;
741
597
}
598
742
599
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
743
600
size_t suf_len = strlen(*suf);
744
601
if((d_name_len >= suf_len)
759
616
}
760
617
761
618
char *filename;
762
if(plugindir == NULL){
763
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
764
} else {
765
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
}
619
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
767
620
if(ret < 0){
768
621
perror("asprintf");
769
622
continue;
770
623
}
771
624
772
625
ret = stat(filename, &st);
773
if(ret == -1){
626
if (ret == -1){
774
627
perror("stat");
775
628
free(filename);
776
629
continue;
777
630
}
778
779
/* Ignore non-executable files */
780
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
631
632
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
781
633
if(debug){
782
634
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
783
635
" with bad type or mode\n", filename);
785
637
free(filename);
786
638
continue;
787
639
}
788
789
plugin *p = getplugin(dirst->d_name);
640
plugin *p = getplugin(dirst->d_name, &plugin_list);
790
641
if(p == NULL){
791
642
perror("getplugin");
792
643
free(filename);
802
653
}
803
654
{
804
655
/* Add global arguments to argument list for this plugin */
805
plugin *g = getplugin(NULL);
656
plugin *g = getplugin(NULL, &plugin_list);
806
657
if(g != NULL){
807
658
for(char **a = g->argv + 1; *a != NULL; a++){
808
659
if(not add_argument(p, *a)){
811
662
}
812
663
/* Add global environment variables */
813
664
for(char **e = g->environ; *e != NULL; e++){
814
if(not add_environment(p, *e, false)){
665
if(not add_environment(p, *e)){
815
666
perror("add_environment");
816
667
}
817
668
}
822
673
process, too. */
823
674
if(p->environ[0] != NULL){
824
675
for(char **e = environ; *e != NULL; e++){
825
if(not add_environment(p, *e, false)){
676
char *copy = strdup(*e);
677
if(copy == NULL){
678
perror("strdup");
679
continue;
680
}
681
if(not add_environment(p, copy)){
826
682
perror("add_environment");
827
683
}
828
684
}
830
686
831
687
int pipefd[2];
832
688
ret = pipe(pipefd);
833
if(ret == -1){
689
if (ret == -1){
834
690
perror("pipe");
835
691
exitstatus = EXIT_FAILURE;
836
692
goto fallback;
837
693
}
838
/* Ask OS to automatic close the pipe on exec */
839
694
ret = set_cloexec_flag(pipefd[0]);
840
695
if(ret < 0){
841
696
perror("set_cloexec_flag");
849
704
goto fallback;
850
705
}
851
706
/* Block SIGCHLD until process is safely in process list */
852
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
707
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
853
708
if(ret < 0){
854
709
perror("sigprocmask");
855
710
exitstatus = EXIT_FAILURE;
856
711
goto fallback;
857
712
}
858
/* Starting a new process to be watched */
713
// Starting a new process to be watched
859
714
pid_t pid = fork();
860
715
if(pid == -1){
861
716
perror("fork");
869
724
perror("sigaction");
870
725
_exit(EXIT_FAILURE);
871
726
}
872
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
727
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
873
728
if(ret < 0){
874
729
perror("sigprocmask");
875
730
_exit(EXIT_FAILURE);
876
731
}
877
732
878
733
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
879
734
if(ret == -1){
880
735
perror("dup2");
899
754
}
900
755
/* no return */
901
756
}
902
/* Parent process */
903
close(pipefd[1]); /* Close unused write end of pipe */
757
/* parent process */
904
758
free(filename);
905
plugin *new_plugin = getplugin(dirst->d_name);
906
if(new_plugin == NULL){
907
perror("getplugin");
908
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
759
close(pipefd[1]); /* close unused write end of pipe */
760
process *new_process = malloc(sizeof(process));
761
if (new_process == NULL){
762
perror("malloc");
763
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
909
764
if(ret < 0){
910
perror("sigprocmask");
765
perror("sigprocmask");
911
766
}
912
767
exitstatus = EXIT_FAILURE;
913
768
goto fallback;
914
769
}
915
770
916
new_plugin->pid = pid;
917
new_plugin->fd = pipefd[0];
918
771
*new_process = (struct process){ .pid = pid,
772
.fd = pipefd[0],
773
.next = process_list };
774
// List handling
775
process_list = new_process;
919
776
/* Unblock SIGCHLD so signal handler can be run if this process
920
777
has already completed */
921
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
778
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
922
779
if(ret < 0){
923
780
perror("sigprocmask");
924
781
exitstatus = EXIT_FAILURE;
925
782
goto fallback;
926
783
}
927
784
928
FD_SET(new_plugin->fd, &rfds_all);
785
FD_SET(new_process->fd, &rfds_all);
929
786
930
if(maxfd < new_plugin->fd){
931
maxfd = new_plugin->fd;
787
if (maxfd < new_process->fd){
788
maxfd = new_process->fd;
932
789
}
790
933
791
}
934
792
793
free_plugin_list(plugin_list);
794
plugin_list = NULL;
795
935
796
closedir(dir);
936
797
dir = NULL;
937
938
for(plugin *p = plugin_list; p != NULL; p = p->next){
939
if(p->pid != 0){
940
break;
941
}
942
if(p->next == NULL){
943
fprintf(stderr, "No plugin processes started. Incorrect plugin"
944
" directory?\n");
945
free_plugin_list();
946
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
947
803
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
804
while(process_list){
951
805
fd_set rfds = rfds_all;
952
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
807
if (select_ret == -1){
954
808
perror("select");
955
809
exitstatus = EXIT_FAILURE;
956
810
goto fallback;
957
811
}
958
812
/* OK, now either a process completed, or something can be read
959
813
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
961
815
/* Is this process completely done? */
962
816
if(proc->eof and proc->completed){
963
817
/* Only accept the plugin output if it exited cleanly */
964
818
if(not WIFEXITED(proc->status)
965
819
or WEXITSTATUS(proc->status) != 0){
966
820
/* Bad exit by plugin */
967
968
821
if(debug){
969
822
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
971
" %d\n", (intmax_t) (proc->pid),
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
972
825
WEXITSTATUS(proc->status));
973
} else if(WIFSIGNALED(proc->status)){
974
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
975
" %d\n", (intmax_t) (proc->pid),
826
} else if(WIFSIGNALED(proc->status)) {
827
fprintf(stderr, "Plugin %u killed by signal %d\n",
828
(unsigned int) (proc->pid),
976
829
WTERMSIG(proc->status));
977
830
} else if(WCOREDUMP(proc->status)){
978
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
979
(intmax_t) (proc->pid));
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
980
833
}
981
834
}
982
983
835
/* Remove the plugin */
984
836
FD_CLR(proc->fd, &rfds_all);
985
986
837
/* Block signal while modifying process_list */
987
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
988
839
if(ret < 0){
989
840
perror("sigprocmask");
990
841
exitstatus = EXIT_FAILURE;
991
842
goto fallback;
992
843
}
993
994
plugin *next_plugin = proc->next;
995
free_plugin(proc);
996
proc = next_plugin;
997
844
/* Delete this process entry from the list */
845
if(process_list == proc){
846
/* First one - simple */
847
process_list = proc->next;
848
} else {
849
/* Second one or later */
850
for(process *p = process_list; p != NULL; p = p->next){
851
if(p->next == proc){
852
p->next = proc->next;
853
break;
854
}
855
}
856
}
998
857
/* We are done modifying process list, so unblock signal */
999
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1000
NULL);
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1001
860
if(ret < 0){
1002
861
perror("sigprocmask");
1003
exitstatus = EXIT_FAILURE;
1004
goto fallback;
1005
}
1006
1007
if(plugin_list == NULL){
1008
break;
1009
}
1010
1011
continue;
862
}
863
free(proc->buffer);
864
free(proc);
865
/* We deleted this process from the list, so we can't go
866
proc->next. Therefore, start over from the beginning of
867
the process list */
868
break;
1012
869
}
1013
1014
870
/* This process exited nicely, so print its buffer */
1015
1016
bool bret = print_out_password(proc->buffer,
1017
proc->buffer_length);
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1018
873
if(not bret){
1019
874
perror("print_out_password");
1020
875
exitstatus = EXIT_FAILURE;
1021
876
}
1022
877
goto fallback;
1023
878
}
1024
1025
879
/* This process has not completed. Does it have any output? */
1026
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1027
881
/* This process had nothing to say at this time */
1028
proc = proc->next;
1029
882
continue;
1030
883
}
1031
884
/* Before reading, make the process' data buffer large enough */
1032
885
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1033
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
1034
887
+ (size_t) BUFFER_SIZE);
1035
if(proc->buffer == NULL){
888
if (proc->buffer == NULL){
1036
889
perror("malloc");
1037
890
exitstatus = EXIT_FAILURE;
1038
891
goto fallback;
1040
893
proc->buffer_size += BUFFER_SIZE;
1041
894
}
1042
895
/* Read from the process */
1043
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1044
BUFFER_SIZE);
1045
if(sret < 0){
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1046
899
/* Read error from this process; ignore the error */
1047
proc = proc->next;
1048
900
continue;
1049
901
}
1050
if(sret == 0){
902
if(ret == 0){
1051
903
/* got EOF */
1052
904
proc->eof = true;
1053
905
} else {
1054
proc->buffer_length += (size_t) sret;
906
proc->buffer_length += (size_t) ret;
1055
907
}
1056
908
}
1057
909
}
1059
911
1060
912
fallback:
1061
913
1062
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1063
/* Fallback if all plugins failed, none are found or an error
1064
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1065
916
bool bret;
1066
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1067
918
char *passwordbuffer = getpass("Password: ");
1068
size_t len = strlen(passwordbuffer);
1069
/* Strip trailing newline */
1070
if(len > 0 and passwordbuffer[len-1] == '\n'){
1071
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1072
len--;
1073
}
1074
bret = print_out_password(passwordbuffer, len);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1075
920
if(not bret){
1076
921
perror("print_out_password");
1077
922
exitstatus = EXIT_FAILURE;
1084
929
perror("sigaction");
1085
930
exitstatus = EXIT_FAILURE;
1086
931
}
1087
932
1088
933
if(custom_argv != NULL){
1089
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1090
935
free(*arg);
1091
936
}
1092
937
free(custom_argv);
1093
938
}
939
free_plugin_list(plugin_list);
1094
940
1095
941
if(dir != NULL){
1096
942
closedir(dir);
1097
943
}
1098
944
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
}
945
/* Free the process list and kill the processes */
946
for(process *next; process_list != NULL; process_list = next){
947
next = process_list->next;
948
close(process_list->fd);
949
ret = kill(process_list->pid, SIGTERM);
950
if(ret == -1 and errno != ESRCH){
951
/* set-uid proccesses migth not get closed */
952
perror("kill");
1108
953
}
954
free(process_list->buffer);
955
free(process_list);
1109
956
}
1110
957
1111
958
/* Wait for any remaining child processes to terminate */
1116
963
perror("wait");
1117
964
}
1118
965
1119
free_plugin_list();
1120
1121
free(plugindir);
1122
free(argfile);
1123
1124
966
return exitstatus;
1125
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0