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- Committer: Björn Påhlsson
- Date: 2008-08-24 09:39:06 UTC
- mfrom: (97 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 99.
- Revision ID: belorn@braxen-20080824093906-eg4koyxsg9rc9qng
merge + small bugfix
- 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 sig_atomic_t completed;
93
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
if(copy_name == NULL){
118
free(new_plugin);
119
return NULL;
120
}
111
}
112
if(copy_name == NULL){
113
return NULL;
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
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
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;
255
221
}
256
222
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
223
bool print_out_password(const char *buffer, size_t length){
259
224
ssize_t ret;
225
if(length>0 and buffer[length-1] == '\n'){
226
length--;
227
}
260
228
for(size_t written = 0; written < length; written += (size_t)ret){
261
229
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
262
230
length - written));
267
235
return true;
268
236
}
269
237
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
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;
294
244
}
295
}
296
297
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;
298
257
}
299
258
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
259
static void free_plugin_list(plugin *plugin_list){
260
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
261
next = plugin_list->next;
262
free(plugin_list->name);
263
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
264
free(*arg);
265
}
266
free(plugin_list->argv);
267
for(char **env = plugin_list->environ; *env != NULL; env++){
268
free(*env);
269
}
270
free(plugin_list->environ);
271
free(plugin_list);
272
}
304
273
}
305
274
306
275
int main(int argc, char *argv[]){
307
char *plugindir = NULL;
308
char *argfile = NULL;
276
const char *plugindir = "/lib/mandos/plugins.d";
277
const char *argfile = ARGFILE;
309
278
FILE *conffp;
310
279
size_t d_name_len;
311
280
DIR *dir = NULL;
312
281
struct dirent *dirst;
313
282
struct stat st;
314
283
fd_set rfds_all;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
284
int ret, maxfd = 0;
318
285
uid_t uid = 65534;
319
286
gid_t gid = 65534;
320
287
bool debug = false;
336
303
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
337
304
if(ret == -1){
338
305
perror("sigaction");
339
exitstatus = EXIT_FAILURE;
306
exitstatus = EXIT_FAILURE;
340
307
goto fallback;
341
308
}
342
309
345
312
{ .name = "global-options", .key = 'g',
346
313
.arg = "OPTION[,OPTION[,...]]",
347
314
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
315
{ .name = "global-envs", .key = 'e',
349
316
.arg = "VAR=value",
350
317
.doc = "Environment variable passed to all plugins" },
351
318
{ .name = "options-for", .key = 'o',
352
319
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
353
320
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
321
{ .name = "envs-for", .key = 'f',
355
322
.arg = "PLUGIN:ENV=value",
356
323
.doc = "Environment variable passed to specified plugin" },
357
324
{ .name = "disable", .key = 'd',
358
325
.arg = "PLUGIN",
359
326
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
363
327
{ .name = "plugin-dir", .key = 128,
364
328
.arg = "DIRECTORY",
365
329
.doc = "Specify a different plugin directory", .group = 2 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
330
{ .name = "userid", .key = 129,
331
.arg = "ID", .flags = 0,
332
.doc = "User ID the plugins will run as", .group = 2 },
333
{ .name = "groupid", .key = 130,
334
.arg = "ID", .flags = 0,
335
.doc = "Group ID the plugins will run as", .group = 2 },
336
{ .name = "debug", .key = 131,
337
.doc = "Debug mode", .group = 3 },
377
338
{ .name = NULL }
378
339
};
379
340
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
341
error_t parse_opt (int key, char *arg, struct argp_state *state) {
342
/* Get the INPUT argument from `argp_parse', which we know is a
343
pointer to our plugin list pointer. */
344
plugin **plugins = state->input;
345
switch (key) {
346
case 'g':
347
if (arg != NULL){
385
348
char *p;
386
349
while((p = strsep(&arg, ",")) != NULL){
387
350
if(p[0] == '\0'){
388
351
continue;
389
352
}
390
if(not add_argument(getplugin(NULL), p)){
353
if(not add_argument(getplugin(NULL, plugins), p)){
391
354
perror("add_argument");
392
355
return ARGP_ERR_UNKNOWN;
393
356
}
394
357
}
395
358
}
396
359
break;
397
case 'G': /* --global-env */
360
case 'e':
398
361
if(arg == NULL){
399
362
break;
400
363
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
364
{
365
char *envdef = strdup(arg);
366
if(envdef == NULL){
367
break;
368
}
369
if(not add_environment(getplugin(NULL, plugins), envdef)){
370
perror("add_environment");
371
}
403
372
}
404
373
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
374
case 'o':
375
if (arg != NULL){
407
376
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
377
if(p_name[0] == '\0'){
409
378
break;
410
379
}
411
380
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
381
if(opt[0] == '\0'){
413
382
break;
414
383
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
384
if(opt != NULL){
385
char *p;
386
while((p = strsep(&opt, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(p_name, plugins), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
423
394
}
424
395
}
425
396
}
426
397
break;
427
case 'E': /* --env-for */
398
case 'f':
428
399
if(arg == NULL){
429
400
break;
430
401
}
433
404
if(envdef == NULL){
434
405
break;
435
406
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
407
char *p_name = strndup(arg, (size_t) (envdef-arg));
408
if(p_name == NULL){
409
break;
410
}
411
envdef++;
412
if(not add_environment(getplugin(p_name, plugins), envdef)){
438
413
perror("add_environment");
439
414
}
440
415
}
441
416
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
417
case 'd':
418
if (arg != NULL){
419
plugin *p = getplugin(arg, plugins);
445
420
if(p == NULL){
446
421
return ARGP_ERR_UNKNOWN;
447
422
}
448
423
p->disabled = true;
449
424
}
450
425
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
426
case 128:
427
plugindir = arg;
428
break;
429
case 129:
430
uid = (uid_t)strtol(arg, NULL, 10);
431
break;
432
case 130:
433
gid = (gid_t)strtol(arg, NULL, 10);
434
break;
435
case 131:
491
436
debug = true;
492
437
break;
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
438
case ARGP_KEY_ARG:
439
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
440
break;
441
case ARGP_KEY_END:
442
break;
443
default:
444
return ARGP_ERR_UNKNOWN;
445
}
446
return 0;
447
}
448
449
plugin *plugin_list = NULL;
450
451
struct argp argp = { .options = options, .parser = parse_opt,
452
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
549
453
.doc = "Mandos plugin runner -- Run plugins" };
550
454
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
455
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
456
if (ret == ARGP_ERR_UNKNOWN){
555
457
fprintf(stderr, "Unknown error while parsing arguments\n");
556
458
exitstatus = EXIT_FAILURE;
557
459
goto fallback;
558
460
}
559
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
461
462
conffp = fopen(argfile, "r");
569
463
if(conffp != NULL){
570
464
char *org_line = NULL;
571
465
char *p, *arg, *new_arg, *line;
572
466
size_t size = 0;
467
ssize_t sret;
573
468
const char whitespace_delims[] = " \r\t\f\v\n";
574
469
const char comment_delim[] = "#";
575
470
576
custom_argc = 1;
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
579
perror("malloc");
580
exitstatus = EXIT_FAILURE;
581
goto fallback;
582
}
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
588
471
while(true){
589
472
sret = getline(&org_line, &size, conffp);
590
473
if(sret == -1){
598
481
continue;
599
482
}
600
483
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
608
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
616
}
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
484
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
485
if (custom_argv == NULL){
486
perror("add_to_argv");
487
exitstatus = EXIT_FAILURE;
488
goto fallback;
489
}
619
490
}
620
491
}
621
492
free(org_line);
622
} else {
493
} else{
623
494
/* Check for harmful errors and go to fallback. Other errors might
624
495
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
496
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
497
perror("fopen");
627
498
exitstatus = EXIT_FAILURE;
628
499
goto fallback;
629
500
}
630
501
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
502
633
503
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
504
custom_argv[0] = argv[0];
505
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
506
if (ret == ARGP_ERR_UNKNOWN){
637
507
fprintf(stderr, "Unknown error while parsing arguments\n");
638
508
exitstatus = EXIT_FAILURE;
639
509
goto fallback;
640
510
}
641
511
}
642
512
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
652
513
if(debug){
653
514
for(plugin *p = plugin_list; p != NULL; p=p->next){
654
515
fprintf(stderr, "Plugin: %s has %d arguments\n",
656
517
for(char **a = p->argv; *a != NULL; a++){
657
518
fprintf(stderr, "\tArg: %s\n", *a);
658
519
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
520
fprintf(stderr, "...and %u environment variables\n", p->envc);
660
521
for(char **a = p->environ; *a != NULL; a++){
661
522
fprintf(stderr, "\t%s\n", *a);
662
523
}
663
524
}
664
525
}
665
526
666
/* Strip permissions down to nobody */
527
ret = setuid(uid);
528
if (ret == -1){
529
perror("setuid");
530
}
531
667
532
setgid(gid);
668
if(ret == -1){
533
if (ret == -1){
669
534
perror("setgid");
670
535
}
671
ret = setuid(uid);
672
if(ret == -1){
673
perror("setuid");
674
}
675
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
536
537
dir = opendir(plugindir);
682
538
if(dir == NULL){
683
539
perror("Could not open plugin dir");
684
540
exitstatus = EXIT_FAILURE;
700
556
701
557
FD_ZERO(&rfds_all);
702
558
703
/* Read and execute any executable in the plugin directory*/
704
559
while(true){
705
560
dirst = readdir(dir);
706
561
707
/* All directory entries have been processed */
562
// All directory entries have been processed
708
563
if(dirst == NULL){
709
if(errno == EBADF){
564
if (errno == EBADF){
710
565
perror("readdir");
711
566
exitstatus = EXIT_FAILURE;
712
567
goto fallback;
716
571
717
572
d_name_len = strlen(dirst->d_name);
718
573
719
/* Ignore dotfiles, backup files and other junk */
574
// Ignore dotfiles, backup files and other junk
720
575
{
721
576
bool bad_name = false;
722
577
724
579
725
580
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
726
581
".dpkg-old",
727
".dpkg-bak",
728
582
".dpkg-divert", NULL };
729
583
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
730
584
size_t pre_len = strlen(*pre);
738
592
break;
739
593
}
740
594
}
595
741
596
if(bad_name){
742
597
continue;
743
598
}
599
744
600
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
745
601
size_t suf_len = strlen(*suf);
746
602
if((d_name_len >= suf_len)
761
617
}
762
618
763
619
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
620
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
769
621
if(ret < 0){
770
622
perror("asprintf");
771
623
continue;
772
624
}
773
625
774
626
ret = stat(filename, &st);
775
if(ret == -1){
627
if (ret == -1){
776
628
perror("stat");
777
629
free(filename);
778
630
continue;
779
631
}
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
632
633
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
783
634
if(debug){
784
635
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
785
636
" with bad type or mode\n", filename);
787
638
free(filename);
788
639
continue;
789
640
}
790
791
plugin *p = getplugin(dirst->d_name);
641
plugin *p = getplugin(dirst->d_name, &plugin_list);
792
642
if(p == NULL){
793
643
perror("getplugin");
794
644
free(filename);
804
654
}
805
655
{
806
656
/* Add global arguments to argument list for this plugin */
807
plugin *g = getplugin(NULL);
657
plugin *g = getplugin(NULL, &plugin_list);
808
658
if(g != NULL){
809
659
for(char **a = g->argv + 1; *a != NULL; a++){
810
660
if(not add_argument(p, *a)){
813
663
}
814
664
/* Add global environment variables */
815
665
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
666
if(not add_environment(p, *e)){
817
667
perror("add_environment");
818
668
}
819
669
}
824
674
process, too. */
825
675
if(p->environ[0] != NULL){
826
676
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
677
char *copy = strdup(*e);
678
if(copy == NULL){
679
perror("strdup");
680
continue;
681
}
682
if(not add_environment(p, copy)){
828
683
perror("add_environment");
829
684
}
830
685
}
831
686
}
832
687
833
int pipefd[2];
688
int pipefd[2];
834
689
ret = pipe(pipefd);
835
if(ret == -1){
690
if (ret == -1){
836
691
perror("pipe");
837
692
exitstatus = EXIT_FAILURE;
838
693
goto fallback;
839
694
}
840
/* Ask OS to automatic close the pipe on exec */
841
695
ret = set_cloexec_flag(pipefd[0]);
842
696
if(ret < 0){
843
697
perror("set_cloexec_flag");
851
705
goto fallback;
852
706
}
853
707
/* Block SIGCHLD until process is safely in process list */
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
708
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
855
709
if(ret < 0){
856
710
perror("sigprocmask");
857
711
exitstatus = EXIT_FAILURE;
858
712
goto fallback;
859
713
}
860
/* Starting a new process to be watched */
714
// Starting a new process to be watched
861
715
pid_t pid = fork();
862
716
if(pid == -1){
863
717
perror("fork");
871
725
perror("sigaction");
872
726
_exit(EXIT_FAILURE);
873
727
}
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
728
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
875
729
if(ret < 0){
876
730
perror("sigprocmask");
877
731
_exit(EXIT_FAILURE);
878
732
}
879
733
880
734
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
881
735
if(ret == -1){
882
736
perror("dup2");
901
755
}
902
756
/* no return */
903
757
}
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
758
/* parent process */
906
759
free(filename);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
760
close(pipefd[1]); /* close unused write end of pipe */
761
process *new_process = malloc(sizeof(process));
762
if (new_process == NULL){
763
perror("malloc");
764
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
911
765
if(ret < 0){
912
perror("sigprocmask");
766
perror("sigprocmask");
913
767
}
914
768
exitstatus = EXIT_FAILURE;
915
769
goto fallback;
916
770
}
917
771
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
772
*new_process = (struct process){ .pid = pid,
773
.fd = pipefd[0],
774
.next = process_list };
775
// List handling
776
process_list = new_process;
921
777
/* Unblock SIGCHLD so signal handler can be run if this process
922
778
has already completed */
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
779
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
924
780
if(ret < 0){
925
781
perror("sigprocmask");
926
782
exitstatus = EXIT_FAILURE;
927
783
goto fallback;
928
784
}
929
785
930
FD_SET(new_plugin->fd, &rfds_all);
786
FD_SET(new_process->fd, &rfds_all);
931
787
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
788
if (maxfd < new_process->fd){
789
maxfd = new_process->fd;
934
790
}
791
935
792
}
936
793
794
free_plugin_list(plugin_list);
795
937
796
closedir(dir);
938
797
dir = NULL;
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
798
799
if (process_list == NULL){
800
fprintf(stderr, "No plugin processes started. Incorrect plugin"
801
" directory?\n");
802
process_list = NULL;
949
803
}
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
804
while(process_list){
953
805
fd_set rfds = rfds_all;
954
806
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
955
if(select_ret == -1){
807
if (select_ret == -1){
956
808
perror("select");
957
809
exitstatus = EXIT_FAILURE;
958
810
goto fallback;
959
811
}
960
812
/* OK, now either a process completed, or something can be read
961
813
from one of them */
962
for(plugin *proc = plugin_list; proc != NULL;){
814
for(process *proc = process_list; proc ; proc = proc->next){
963
815
/* Is this process completely done? */
964
if(proc->completed and proc->eof){
816
if(proc->eof and proc->completed){
965
817
/* Only accept the plugin output if it exited cleanly */
966
818
if(not WIFEXITED(proc->status)
967
819
or WEXITSTATUS(proc->status) != 0){
968
820
/* Bad exit by plugin */
969
970
821
if(debug){
971
822
if(WIFEXITED(proc->status)){
972
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
973
" status %d\n", proc->name,
974
(intmax_t) (proc->pid),
823
fprintf(stderr, "Plugin %u exited with status %d\n",
824
(unsigned int) (proc->pid),
975
825
WEXITSTATUS(proc->status));
976
} else if(WIFSIGNALED(proc->status)){
977
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
978
" signal %d\n", proc->name,
979
(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),
980
829
WTERMSIG(proc->status));
981
830
} else if(WCOREDUMP(proc->status)){
982
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
983
" core\n", proc->name, (intmax_t) (proc->pid));
831
fprintf(stderr, "Plugin %d dumped core\n",
832
(unsigned int) (proc->pid));
984
833
}
985
834
}
986
987
835
/* Remove the plugin */
988
836
FD_CLR(proc->fd, &rfds_all);
989
990
837
/* Block signal while modifying process_list */
991
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
838
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
992
839
if(ret < 0){
993
840
perror("sigprocmask");
994
841
exitstatus = EXIT_FAILURE;
995
842
goto fallback;
996
843
}
997
998
plugin *next_plugin = proc->next;
999
free_plugin(proc);
1000
proc = next_plugin;
1001
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
}
1002
857
/* We are done modifying process list, so unblock signal */
1003
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1004
NULL);
858
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
859
NULL);
1005
860
if(ret < 0){
1006
861
perror("sigprocmask");
1007
exitstatus = EXIT_FAILURE;
1008
goto fallback;
1009
}
1010
1011
if(plugin_list == NULL){
1012
break;
1013
}
1014
1015
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;
1016
869
}
1017
1018
870
/* This process exited nicely, so print its buffer */
1019
1020
bool bret = print_out_password(proc->buffer,
1021
proc->buffer_length);
871
872
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1022
873
if(not bret){
1023
874
perror("print_out_password");
1024
875
exitstatus = EXIT_FAILURE;
1025
876
}
1026
877
goto fallback;
1027
878
}
1028
1029
879
/* This process has not completed. Does it have any output? */
1030
880
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1031
881
/* This process had nothing to say at this time */
1032
proc = proc->next;
1033
882
continue;
1034
883
}
1035
884
/* Before reading, make the process' data buffer large enough */
1036
885
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1037
886
proc->buffer = realloc(proc->buffer, proc->buffer_size
1038
887
+ (size_t) BUFFER_SIZE);
1039
if(proc->buffer == NULL){
888
if (proc->buffer == NULL){
1040
889
perror("malloc");
1041
890
exitstatus = EXIT_FAILURE;
1042
891
goto fallback;
1044
893
proc->buffer_size += BUFFER_SIZE;
1045
894
}
1046
895
/* Read from the process */
1047
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1048
BUFFER_SIZE);
1049
if(sret < 0){
896
ret = read(proc->fd, proc->buffer + proc->buffer_length,
897
BUFFER_SIZE);
898
if(ret < 0){
1050
899
/* Read error from this process; ignore the error */
1051
proc = proc->next;
1052
900
continue;
1053
901
}
1054
if(sret == 0){
902
if(ret == 0){
1055
903
/* got EOF */
1056
904
proc->eof = true;
1057
905
} else {
1058
proc->buffer_length += (size_t) sret;
906
proc->buffer_length += (size_t) ret;
1059
907
}
1060
908
}
1061
909
}
1063
911
1064
912
fallback:
1065
913
1066
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1067
/* Fallback if all plugins failed, none are found or an error
1068
occured */
914
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
915
/* Fallback if all plugins failed, none are found or an error occured */
1069
916
bool bret;
1070
917
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1071
918
char *passwordbuffer = getpass("Password: ");
1072
size_t len = strlen(passwordbuffer);
1073
/* Strip trailing newline */
1074
if(len > 0 and passwordbuffer[len-1] == '\n'){
1075
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1076
len--;
1077
}
1078
bret = print_out_password(passwordbuffer, len);
919
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1079
920
if(not bret){
1080
921
perror("print_out_password");
1081
922
exitstatus = EXIT_FAILURE;
1088
929
perror("sigaction");
1089
930
exitstatus = EXIT_FAILURE;
1090
931
}
1091
932
1092
933
if(custom_argv != NULL){
1093
for(char **arg = custom_argv+1; *arg != NULL; arg++){
934
for(char **arg = custom_argv; *arg != NULL; arg++){
1094
935
free(*arg);
1095
936
}
1096
937
free(custom_argv);
1097
938
}
939
free_plugin_list(plugin_list);
1098
940
1099
941
if(dir != NULL){
1100
942
closedir(dir);
1101
943
}
1102
944
1103
/* Kill the processes */
1104
for(plugin *p = plugin_list; p != NULL; p = p->next){
1105
if(p->pid != 0){
1106
close(p->fd);
1107
ret = kill(p->pid, SIGTERM);
1108
if(ret == -1 and errno != ESRCH){
1109
/* Set-uid proccesses might not get closed */
1110
perror("kill");
1111
}
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");
1112
953
}
954
free(process_list->buffer);
955
free(process_list);
1113
956
}
1114
957
1115
958
/* Wait for any remaining child processes to terminate */
1120
963
perror("wait");
1121
964
}
1122
965
1123
free_plugin_list();
1124
1125
free(plugindir);
1126
free(argfile);
1127
1128
966
return exitstatus;
1129
967
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0