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- Committer: Björn Påhlsson
- Date: 2008-08-16 20:31:21 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816203121-u3uavdi14y1xjj0b
updated some partial manual pages
- files added:
- network-protocol.txt
- 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
SIG_UNBLOCK, kill(), sig_atomic_t
66
*/
63
SIG_UNBLOCK, kill() */
67
64
#include <errno.h> /* errno, EBADF */
68
#include <inttypes.h> /* intmax_t, PRIdMAX, strtoimax() */
69
65
70
66
#define BUFFER_SIZE 256
71
72
#define PDIR "/lib/mandos/plugins.d"
73
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
74
75
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";
76
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
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
78
86
typedef struct plugin{
79
87
char *name; /* can be NULL or any plugin name */
80
88
char **argv;
82
90
char **environ;
83
91
int envc;
84
92
bool disabled;
85
86
/* Variables used for running processes*/
87
pid_t pid;
88
int fd;
89
char *buffer;
90
size_t buffer_size;
91
size_t buffer_length;
92
bool eof;
93
volatile sig_atomic_t completed;
94
int status;
95
93
struct plugin *next;
96
94
} plugin;
97
95
98
static plugin *plugin_list = NULL;
99
100
/* Gets an existing plugin based on name,
101
or if none is found, creates a new one */
102
static plugin *getplugin(char *name){
103
/* Check for exiting plugin with that name */
104
for(plugin *p = plugin_list; p != NULL; p = p->next){
105
if((p->name == name)
106
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))){
107
100
return p;
108
101
}
109
102
}
110
103
/* Create a new plugin */
111
104
plugin *new_plugin = malloc(sizeof(plugin));
112
if(new_plugin == NULL){
105
if (new_plugin == NULL){
113
106
return NULL;
114
107
}
115
char *copy_name = NULL;
116
if(name != NULL){
117
copy_name = strdup(name);
118
if(copy_name == NULL){
119
free(new_plugin);
120
return NULL;
121
}
108
char *copy_name = strdup(name);
109
if(copy_name == NULL){
110
return NULL;
122
111
}
123
112
124
*new_plugin = (plugin){ .name = copy_name,
125
.argc = 1,
126
.disabled = false,
127
.next = plugin_list };
113
*new_plugin = (plugin) { .name = copy_name,
114
.argc = 1,
115
.envc = 0,
116
.disabled = false,
117
.next = *plugin_list };
128
118
129
119
new_plugin->argv = malloc(sizeof(char *) * 2);
130
if(new_plugin->argv == NULL){
131
free(copy_name);
120
if (new_plugin->argv == NULL){
132
121
free(new_plugin);
133
122
return NULL;
134
123
}
135
124
new_plugin->argv[0] = copy_name;
136
125
new_plugin->argv[1] = NULL;
137
126
138
127
new_plugin->environ = malloc(sizeof(char *));
139
128
if(new_plugin->environ == NULL){
140
free(copy_name);
141
129
free(new_plugin->argv);
142
130
free(new_plugin);
143
131
return NULL;
144
132
}
145
133
new_plugin->environ[0] = NULL;
146
147
134
/* Append the new plugin to the list */
148
plugin_list = new_plugin;
135
*plugin_list = new_plugin;
149
136
return new_plugin;
150
137
}
151
138
181
168
}
182
169
183
170
/* Add to a plugin's environment */
184
static bool add_environment(plugin *p, const char *def, bool replace){
171
static bool add_environment(plugin *p, const char *def){
185
172
if(p == NULL){
186
173
return false;
187
174
}
188
/* namelen = length of name of environment variable */
189
size_t namelen = (size_t)(strchrnul(def, '=') - def);
190
/* Search for this environment variable */
191
for(char **e = p->environ; *e != NULL; e++){
192
if(strncmp(*e, def, namelen + 1) == 0){
193
/* It already exists */
194
if(replace){
195
char *new = realloc(*e, strlen(def) + 1);
196
if(new == NULL){
197
return false;
198
}
199
*e = new;
200
strcpy(*e, def);
201
}
202
return true;
203
}
204
}
205
175
return add_to_char_array(def, &(p->environ), &(p->envc));
206
176
}
207
177
178
208
179
/*
209
180
* Based on the example in the GNU LibC manual chapter 13.13 "File
210
181
* Descriptor Flags".
211
182
* *Note File Descriptor Flags:(libc)Descriptor Flags.
212
183
*/
213
static int set_cloexec_flag(int fd){
184
static int set_cloexec_flag(int fd)
185
{
214
186
int ret = fcntl(fd, F_GETFD, 0);
215
187
/* If reading the flags failed, return error indication now. */
216
188
if(ret < 0){
220
192
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
221
193
}
222
194
195
process *process_list = NULL;
223
196
224
/* Mark processes as completed when they exit, and save their exit
197
/* Mark a process as completed when it exits, and save its exit
225
198
status. */
226
static void handle_sigchld(__attribute__((unused)) int sig){
227
int old_errno = errno;
228
while(true){
229
plugin *proc = plugin_list;
230
int status;
231
pid_t pid = waitpid(-1, &status, WNOHANG);
232
if(pid == 0){
233
/* Only still running child processes */
234
break;
235
}
236
if(pid == -1){
237
if(errno == ECHILD){
238
/* No child processes */
239
break;
240
}
241
perror("waitpid");
242
}
243
244
/* A child exited, find it in process_list */
245
while(proc != NULL and proc->pid != pid){
246
proc = proc->next;
247
}
248
if(proc == NULL){
249
/* Process not found in process list */
250
continue;
251
}
252
proc->status = status;
253
proc->completed = 1;
254
}
255
errno = old_errno;
199
void handle_sigchld(__attribute__((unused)) int sig){
200
process *proc = process_list;
201
int status;
202
pid_t pid = wait(&status);
203
if(pid == -1){
204
perror("wait");
205
return;
206
}
207
while(proc != NULL and proc->pid != pid){
208
proc = proc->next;
209
}
210
if(proc == NULL){
211
/* Process not found in process list */
212
return;
213
}
214
proc->status = status;
215
proc->completed = true;
256
216
}
257
217
258
/* Prints out a password to stdout */
259
static bool print_out_password(const char *buffer, size_t length){
218
bool print_out_password(const char *buffer, size_t length){
260
219
ssize_t ret;
220
if(length>0 and buffer[length-1] == '\n'){
221
length--;
222
}
261
223
for(size_t written = 0; written < length; written += (size_t)ret){
262
224
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
225
length - written));
268
230
return true;
269
231
}
270
232
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
283
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
233
char **add_to_argv(char **argv, int *argc, char *arg){
234
if (argv == NULL){
235
*argc = 1;
236
argv = malloc(sizeof(char*) * 2);
237
if(argv == NULL){
238
return NULL;
295
239
}
296
}
297
298
free(plugin_node);
240
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
241
argv[1] = NULL;
242
}
243
*argc += 1;
244
argv = realloc(argv, sizeof(char *)
245
* ((unsigned int) *argc + 1));
246
if(argv == NULL){
247
return NULL;
248
}
249
argv[*argc-1] = arg;
250
argv[*argc] = NULL;
251
return argv;
299
252
}
300
253
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
254
static void free_plugin_list(plugin *plugin_list){
255
for(plugin *next = plugin_list; plugin_list != NULL; plugin_list = next){
256
next = plugin_list->next;
257
free(plugin_list->name);
258
for(char **arg = plugin_list->argv; *arg != NULL; arg++){
259
free(*arg);
260
}
261
free(plugin_list->argv);
262
for(char **env = plugin_list->environ; *env != NULL; env++){
263
free(*env);
264
}
265
free(plugin_list->environ);
266
free(plugin_list);
267
}
305
268
}
306
269
307
270
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
271
const char *plugindir = "/lib/mandos/plugins.d";
272
const char *argfile = ARGFILE;
310
273
FILE *conffp;
311
274
size_t d_name_len;
312
275
DIR *dir = NULL;
314
277
struct stat st;
315
278
fd_set rfds_all;
316
279
int ret, maxfd = 0;
317
ssize_t sret;
318
intmax_t tmpmax;
319
280
uid_t uid = 65534;
320
281
gid_t gid = 65534;
321
282
bool debug = false;
337
298
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
338
299
if(ret == -1){
339
300
perror("sigaction");
340
exitstatus = EXIT_FAILURE;
301
exitstatus = EXIT_FAILURE;
341
302
goto fallback;
342
303
}
343
304
346
307
{ .name = "global-options", .key = 'g',
347
308
.arg = "OPTION[,OPTION[,...]]",
348
309
.doc = "Options passed to all plugins" },
349
{ .name = "global-env", .key = 'G',
310
{ .name = "global-envs", .key = 'e',
350
311
.arg = "VAR=value",
351
312
.doc = "Environment variable passed to all plugins" },
352
313
{ .name = "options-for", .key = 'o',
353
314
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
354
315
.doc = "Options passed only to specified plugin" },
355
{ .name = "env-for", .key = 'E',
316
{ .name = "envs-for", .key = 'f',
356
317
.arg = "PLUGIN:ENV=value",
357
318
.doc = "Environment variable passed to specified plugin" },
358
319
{ .name = "disable", .key = 'd',
359
320
.arg = "PLUGIN",
360
321
.doc = "Disable a specific plugin", .group = 1 },
361
{ .name = "enable", .key = 'e',
362
.arg = "PLUGIN",
363
.doc = "Enable a specific plugin", .group = 1 },
364
322
{ .name = "plugin-dir", .key = 128,
365
323
.arg = "DIRECTORY",
366
324
.doc = "Specify a different plugin directory", .group = 2 },
367
{ .name = "config-file", .key = 129,
368
.arg = "FILE",
369
.doc = "Specify a different configuration file", .group = 2 },
370
{ .name = "userid", .key = 130,
371
.arg = "ID", .flags = 0,
372
.doc = "User ID the plugins will run as", .group = 3 },
373
{ .name = "groupid", .key = 131,
374
.arg = "ID", .flags = 0,
375
.doc = "Group ID the plugins will run as", .group = 3 },
376
{ .name = "debug", .key = 132,
377
.doc = "Debug mode", .group = 4 },
325
{ .name = "userid", .key = 129,
326
.arg = "ID", .flags = 0,
327
.doc = "User ID the plugins will run as", .group = 2 },
328
{ .name = "groupid", .key = 130,
329
.arg = "ID", .flags = 0,
330
.doc = "Group ID the plugins will run as", .group = 2 },
331
{ .name = "debug", .key = 131,
332
.doc = "Debug mode", .group = 3 },
378
333
{ .name = NULL }
379
334
};
380
335
381
error_t parse_opt(int key, char *arg, __attribute__((unused))
382
struct argp_state *state){
383
char *tmp;
384
switch(key){
385
case 'g': /* --global-options */
386
if(arg != NULL){
387
char *plugin_option;
388
while((plugin_option = strsep(&arg, ",")) != NULL){
389
if(plugin_option[0] == '\0'){
336
error_t parse_opt (int key, char *arg, struct argp_state *state) {
337
/* Get the INPUT argument from `argp_parse', which we know is a
338
pointer to our plugin list pointer. */
339
plugin **plugins = state->input;
340
switch (key) {
341
case 'g':
342
if (arg != NULL){
343
char *p;
344
while((p = strsep(&arg, ",")) != NULL){
345
if(p[0] == '\0'){
390
346
continue;
391
347
}
392
if(not add_argument(getplugin(NULL), plugin_option)){
348
if(not add_argument(getplugin(NULL, plugins), p)){
393
349
perror("add_argument");
394
350
return ARGP_ERR_UNKNOWN;
395
351
}
396
352
}
397
353
}
398
354
break;
399
case 'G': /* --global-env */
355
case 'e':
400
356
if(arg == NULL){
401
357
break;
402
358
}
403
if(not add_environment(getplugin(NULL), arg, true)){
404
perror("add_environment");
359
{
360
char *envdef = strdup(arg);
361
if(envdef == NULL){
362
break;
363
}
364
if(not add_environment(getplugin(NULL, plugins), envdef)){
365
perror("add_environment");
366
}
405
367
}
406
368
break;
407
case 'o': /* --options-for */
408
if(arg != NULL){
409
char *plugin_name = strsep(&arg, ":");
410
if(plugin_name[0] == '\0'){
411
break;
412
}
413
char *plugin_option;
414
while((plugin_option = strsep(&arg, ",")) != NULL){
415
if(not add_argument(getplugin(plugin_name), plugin_option)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
369
case 'o':
370
if (arg != NULL){
371
char *p_name = strsep(&arg, ":");
372
if(p_name[0] == '\0'){
373
break;
374
}
375
char *opt = strsep(&arg, ":");
376
if(opt[0] == '\0'){
377
break;
378
}
379
if(opt != NULL){
380
char *p;
381
while((p = strsep(&opt, ",")) != NULL){
382
if(p[0] == '\0'){
383
continue;
384
}
385
if(not add_argument(getplugin(p_name, plugins), p)){
386
perror("add_argument");
387
return ARGP_ERR_UNKNOWN;
388
}
418
389
}
419
390
}
420
391
}
421
392
break;
422
case 'E': /* --env-for */
393
case 'f':
423
394
if(arg == NULL){
424
395
break;
425
396
}
428
399
if(envdef == NULL){
429
400
break;
430
401
}
431
*envdef = '\0';
432
if(not add_environment(getplugin(arg), envdef+1, true)){
402
char *p_name = strndup(arg, (size_t) (envdef-arg));
403
if(p_name == NULL){
404
break;
405
}
406
envdef++;
407
if(not add_environment(getplugin(p_name, plugins), envdef)){
433
408
perror("add_environment");
434
409
}
435
410
}
436
411
break;
437
case 'd': /* --disable */
438
if(arg != NULL){
439
plugin *p = getplugin(arg);
412
case 'd':
413
if (arg != NULL){
414
plugin *p = getplugin(arg, plugins);
440
415
if(p == NULL){
441
416
return ARGP_ERR_UNKNOWN;
442
417
}
443
418
p->disabled = true;
444
419
}
445
420
break;
446
case 'e': /* --enable */
447
if(arg != NULL){
448
plugin *p = getplugin(arg);
449
if(p == NULL){
450
return ARGP_ERR_UNKNOWN;
451
}
452
p->disabled = false;
453
}
454
break;
455
case 128: /* --plugin-dir */
456
free(plugindir);
457
plugindir = strdup(arg);
458
if(plugindir == NULL){
459
perror("strdup");
460
}
461
break;
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
464
break;
465
case 130: /* --userid */
466
errno = 0;
467
tmpmax = strtoimax(arg, &tmp, 10);
468
if(errno != 0 or tmp == arg or *tmp != '\0'
469
or tmpmax != (uid_t)tmpmax){
470
fprintf(stderr, "Bad user ID number: \"%s\", using %"
471
PRIdMAX "\n", arg, (intmax_t)uid);
472
} else {
473
uid = (uid_t)tmpmax;
474
}
475
break;
476
case 131: /* --groupid */
477
errno = 0;
478
tmpmax = strtoimax(arg, &tmp, 10);
479
if(errno != 0 or tmp == arg or *tmp != '\0'
480
or tmpmax != (gid_t)tmpmax){
481
fprintf(stderr, "Bad group ID number: \"%s\", using %"
482
PRIdMAX "\n", arg, (intmax_t)gid);
483
} else {
484
gid = (gid_t)tmpmax;
485
}
486
break;
487
case 132: /* --debug */
421
case 128:
422
plugindir = arg;
423
break;
424
case 129:
425
uid = (uid_t)strtol(arg, NULL, 10);
426
break;
427
case 130:
428
gid = (gid_t)strtol(arg, NULL, 10);
429
break;
430
case 131:
488
431
debug = true;
489
432
break;
490
/*
491
* When adding more options before this line, remember to also add a
492
* "case" to the "parse_opt_config_file" function below.
493
*/
494
case ARGP_KEY_ARG:
495
/* Cryptsetup always passes an argument, which is an empty
496
string if "none" was specified in /etc/crypttab. So if
497
argument was empty, we ignore it silently. */
498
if(arg[0] != '\0'){
499
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
500
}
501
break;
502
case ARGP_KEY_END:
503
break;
504
default:
505
return ARGP_ERR_UNKNOWN;
506
}
507
return 0;
508
}
509
510
/* This option parser is the same as parse_opt() above, except it
511
ignores everything but the --config-file option. */
512
error_t parse_opt_config_file(int key, char *arg,
513
__attribute__((unused))
514
struct argp_state *state){
515
switch(key){
516
case 'g': /* --global-options */
517
case 'G': /* --global-env */
518
case 'o': /* --options-for */
519
case 'E': /* --env-for */
520
case 'd': /* --disable */
521
case 'e': /* --enable */
522
case 128: /* --plugin-dir */
523
break;
524
case 129: /* --config-file */
525
free(argfile);
526
argfile = strdup(arg);
527
if(argfile == NULL){
528
perror("strdup");
529
}
530
break;
531
case 130: /* --userid */
532
case 131: /* --groupid */
533
case 132: /* --debug */
534
case ARGP_KEY_ARG:
535
case ARGP_KEY_END:
536
break;
537
default:
538
return ARGP_ERR_UNKNOWN;
539
}
540
return 0;
541
}
542
543
struct argp argp = { .options = options,
544
.parser = parse_opt_config_file,
545
.args_doc = "",
433
case ARGP_KEY_ARG:
434
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
435
break;
436
case ARGP_KEY_END:
437
break;
438
default:
439
return ARGP_ERR_UNKNOWN;
440
}
441
return 0;
442
}
443
444
plugin *plugin_list = NULL;
445
446
struct argp argp = { .options = options, .parser = parse_opt,
447
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
546
448
.doc = "Mandos plugin runner -- Run plugins" };
547
449
548
/* Parse using parse_opt_config_file() in order to get the custom
549
config file location, if any. */
550
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
551
if(ret == ARGP_ERR_UNKNOWN){
450
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
451
if (ret == ARGP_ERR_UNKNOWN){
552
452
fprintf(stderr, "Unknown error while parsing arguments\n");
553
453
exitstatus = EXIT_FAILURE;
554
454
goto fallback;
555
455
}
556
557
/* Reset to the normal argument parser */
558
argp.parser = parse_opt;
559
560
/* Open the configfile if available */
561
if(argfile == NULL){
562
conffp = fopen(AFILE, "r");
563
} else {
564
conffp = fopen(argfile, "r");
565
}
456
457
conffp = fopen(argfile, "r");
566
458
if(conffp != NULL){
567
459
char *org_line = NULL;
568
460
char *p, *arg, *new_arg, *line;
569
461
size_t size = 0;
462
ssize_t sret;
570
463
const char whitespace_delims[] = " \r\t\f\v\n";
571
464
const char comment_delim[] = "#";
572
573
custom_argc = 1;
574
custom_argv = malloc(sizeof(char*) * 2);
575
if(custom_argv == NULL){
576
perror("malloc");
577
exitstatus = EXIT_FAILURE;
578
goto fallback;
579
}
580
custom_argv[0] = argv[0];
581
custom_argv[1] = NULL;
582
583
/* for each line in the config file, strip whitespace and ignore
584
commented text */
465
585
466
while(true){
586
467
sret = getline(&org_line, &size, conffp);
587
468
if(sret == -1){
588
469
break;
589
470
}
590
471
591
472
line = org_line;
592
473
arg = strsep(&line, comment_delim);
593
474
while((p = strsep(&arg, whitespace_delims)) != NULL){
595
476
continue;
596
477
}
597
478
new_arg = strdup(p);
598
if(new_arg == NULL){
599
perror("strdup");
600
exitstatus = EXIT_FAILURE;
601
free(org_line);
602
goto fallback;
603
}
604
605
custom_argc += 1;
606
custom_argv = realloc(custom_argv, sizeof(char *)
607
* ((unsigned int) custom_argc + 1));
608
if(custom_argv == NULL){
609
perror("realloc");
610
exitstatus = EXIT_FAILURE;
611
free(org_line);
612
goto fallback;
613
}
614
custom_argv[custom_argc-1] = new_arg;
615
custom_argv[custom_argc] = NULL;
479
custom_argv = add_to_argv(custom_argv, &custom_argc, new_arg);
480
if (custom_argv == NULL){
481
perror("add_to_argv");
482
exitstatus = EXIT_FAILURE;
483
goto fallback;
484
}
616
485
}
617
486
}
618
487
free(org_line);
619
} else {
488
} else{
620
489
/* Check for harmful errors and go to fallback. Other errors might
621
490
not affect opening plugins */
622
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
491
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
623
492
perror("fopen");
624
493
exitstatus = EXIT_FAILURE;
625
494
goto fallback;
626
495
}
627
496
}
628
/* If there was any arguments from configuration file,
629
pass them to parser as command arguments */
497
630
498
if(custom_argv != NULL){
631
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
632
0, NULL);
633
if(ret == ARGP_ERR_UNKNOWN){
499
custom_argv[0] = argv[0];
500
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
501
if (ret == ARGP_ERR_UNKNOWN){
634
502
fprintf(stderr, "Unknown error while parsing arguments\n");
635
503
exitstatus = EXIT_FAILURE;
636
504
goto fallback;
637
505
}
638
506
}
639
507
640
/* Parse actual command line arguments, to let them override the
641
config file */
642
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
643
if(ret == ARGP_ERR_UNKNOWN){
644
fprintf(stderr, "Unknown error while parsing arguments\n");
645
exitstatus = EXIT_FAILURE;
646
goto fallback;
647
}
648
649
508
if(debug){
650
509
for(plugin *p = plugin_list; p != NULL; p=p->next){
651
510
fprintf(stderr, "Plugin: %s has %d arguments\n",
653
512
for(char **a = p->argv; *a != NULL; a++){
654
513
fprintf(stderr, "\tArg: %s\n", *a);
655
514
}
656
fprintf(stderr, "...and %d environment variables\n", p->envc);
515
fprintf(stderr, "...and %u environment variables\n", p->envc);
657
516
for(char **a = p->environ; *a != NULL; a++){
658
517
fprintf(stderr, "\t%s\n", *a);
659
518
}
660
519
}
661
520
}
662
521
663
/* Strip permissions down to nobody */
522
ret = setuid(uid);
523
if (ret == -1){
524
perror("setuid");
525
}
526
664
527
setgid(gid);
665
if(ret == -1){
528
if (ret == -1){
666
529
perror("setgid");
667
530
}
668
ret = setuid(uid);
669
if(ret == -1){
670
perror("setuid");
671
}
672
673
if(plugindir == NULL){
674
dir = opendir(PDIR);
675
} else {
676
dir = opendir(plugindir);
677
}
678
531
532
dir = opendir(plugindir);
679
533
if(dir == NULL){
680
534
perror("Could not open plugin dir");
681
535
exitstatus = EXIT_FAILURE;
697
551
698
552
FD_ZERO(&rfds_all);
699
553
700
/* Read and execute any executable in the plugin directory*/
701
554
while(true){
702
555
dirst = readdir(dir);
703
556
704
/* All directory entries have been processed */
557
// All directory entries have been processed
705
558
if(dirst == NULL){
706
if(errno == EBADF){
559
if (errno == EBADF){
707
560
perror("readdir");
708
561
exitstatus = EXIT_FAILURE;
709
562
goto fallback;
713
566
714
567
d_name_len = strlen(dirst->d_name);
715
568
716
/* Ignore dotfiles, backup files and other junk */
569
// Ignore dotfiles, backup files and other junk
717
570
{
718
571
bool bad_name = false;
719
572
721
574
722
575
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
723
576
".dpkg-old",
724
".dpkg-bak",
725
577
".dpkg-divert", NULL };
726
578
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
727
579
size_t pre_len = strlen(*pre);
735
587
break;
736
588
}
737
589
}
590
738
591
if(bad_name){
739
592
continue;
740
593
}
594
741
595
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
742
596
size_t suf_len = strlen(*suf);
743
597
if((d_name_len >= suf_len)
756
610
continue;
757
611
}
758
612
}
759
613
760
614
char *filename;
761
if(plugindir == NULL){
762
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
763
} else {
764
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
765
}
615
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
766
616
if(ret < 0){
767
617
perror("asprintf");
768
618
continue;
769
619
}
770
620
771
621
ret = stat(filename, &st);
772
if(ret == -1){
622
if (ret == -1){
773
623
perror("stat");
774
624
free(filename);
775
625
continue;
776
626
}
777
627
778
/* Ignore non-executable files */
779
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
628
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
629
if(debug){
781
630
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
782
631
" with bad type or mode\n", filename);
784
633
free(filename);
785
634
continue;
786
635
}
787
788
plugin *p = getplugin(dirst->d_name);
636
plugin *p = getplugin(dirst->d_name, &plugin_list);
789
637
if(p == NULL){
790
638
perror("getplugin");
791
639
free(filename);
801
649
}
802
650
{
803
651
/* Add global arguments to argument list for this plugin */
804
plugin *g = getplugin(NULL);
652
plugin *g = getplugin(NULL, &plugin_list);
805
653
if(g != NULL){
806
654
for(char **a = g->argv + 1; *a != NULL; a++){
807
655
if(not add_argument(p, *a)){
810
658
}
811
659
/* Add global environment variables */
812
660
for(char **e = g->environ; *e != NULL; e++){
813
if(not add_environment(p, *e, false)){
661
if(not add_environment(p, *e)){
814
662
perror("add_environment");
815
663
}
816
664
}
821
669
process, too. */
822
670
if(p->environ[0] != NULL){
823
671
for(char **e = environ; *e != NULL; e++){
824
if(not add_environment(p, *e, false)){
672
char *copy = strdup(*e);
673
if(copy == NULL){
674
perror("strdup");
675
continue;
676
}
677
if(not add_environment(p, copy)){
825
678
perror("add_environment");
826
679
}
827
680
}
828
681
}
829
682
830
int pipefd[2];
683
int pipefd[2];
831
684
ret = pipe(pipefd);
832
if(ret == -1){
685
if (ret == -1){
833
686
perror("pipe");
834
687
exitstatus = EXIT_FAILURE;
835
688
goto fallback;
836
689
}
837
/* Ask OS to automatic close the pipe on exec */
838
690
ret = set_cloexec_flag(pipefd[0]);
839
691
if(ret < 0){
840
692
perror("set_cloexec_flag");
848
700
goto fallback;
849
701
}
850
702
/* Block SIGCHLD until process is safely in process list */
851
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
703
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
852
704
if(ret < 0){
853
705
perror("sigprocmask");
854
706
exitstatus = EXIT_FAILURE;
855
707
goto fallback;
856
708
}
857
/* Starting a new process to be watched */
709
// Starting a new process to be watched
858
710
pid_t pid = fork();
859
711
if(pid == -1){
860
712
perror("fork");
868
720
perror("sigaction");
869
721
_exit(EXIT_FAILURE);
870
722
}
871
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
723
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
872
724
if(ret < 0){
873
725
perror("sigprocmask");
874
726
_exit(EXIT_FAILURE);
875
727
}
876
728
877
729
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
878
730
if(ret == -1){
879
731
perror("dup2");
898
750
}
899
751
/* no return */
900
752
}
901
/* Parent process */
902
close(pipefd[1]); /* Close unused write end of pipe */
753
/* parent process */
903
754
free(filename);
904
plugin *new_plugin = getplugin(dirst->d_name);
905
if(new_plugin == NULL){
906
perror("getplugin");
907
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
755
close(pipefd[1]); /* close unused write end of pipe */
756
process *new_process = malloc(sizeof(process));
757
if (new_process == NULL){
758
perror("malloc");
759
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
908
760
if(ret < 0){
909
perror("sigprocmask");
761
perror("sigprocmask");
910
762
}
911
763
exitstatus = EXIT_FAILURE;
912
764
goto fallback;
913
765
}
914
766
915
new_plugin->pid = pid;
916
new_plugin->fd = pipefd[0];
917
767
*new_process = (struct process){ .pid = pid,
768
.fd = pipefd[0],
769
.next = process_list };
770
// List handling
771
process_list = new_process;
918
772
/* Unblock SIGCHLD so signal handler can be run if this process
919
773
has already completed */
920
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
774
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
921
775
if(ret < 0){
922
776
perror("sigprocmask");
923
777
exitstatus = EXIT_FAILURE;
924
778
goto fallback;
925
779
}
926
780
927
FD_SET(new_plugin->fd, &rfds_all);
781
FD_SET(new_process->fd, &rfds_all);
928
782
929
if(maxfd < new_plugin->fd){
930
maxfd = new_plugin->fd;
783
if (maxfd < new_process->fd){
784
maxfd = new_process->fd;
931
785
}
786
932
787
}
933
788
789
free_plugin_list(plugin_list);
790
934
791
closedir(dir);
935
792
dir = NULL;
936
free_plugin(getplugin(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
}
793
794
if (process_list == NULL){
795
fprintf(stderr, "No plugin processes started. Incorrect plugin"
796
" directory?\n");
797
process_list = NULL;
947
798
}
948
949
/* Main loop while running plugins exist */
950
while(plugin_list){
799
while(process_list){
951
800
fd_set rfds = rfds_all;
952
801
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
953
if(select_ret == -1){
802
if (select_ret == -1){
954
803
perror("select");
955
804
exitstatus = EXIT_FAILURE;
956
805
goto fallback;
957
806
}
958
807
/* OK, now either a process completed, or something can be read
959
808
from one of them */
960
for(plugin *proc = plugin_list; proc != NULL;){
809
for(process *proc = process_list; proc ; proc = proc->next){
961
810
/* Is this process completely done? */
962
if(proc->completed and proc->eof){
811
if(proc->eof and proc->completed){
963
812
/* Only accept the plugin output if it exited cleanly */
964
813
if(not WIFEXITED(proc->status)
965
814
or WEXITSTATUS(proc->status) != 0){
966
815
/* Bad exit by plugin */
967
968
816
if(debug){
969
817
if(WIFEXITED(proc->status)){
970
fprintf(stderr, "Plugin %s [%" PRIdMAX "] exited with"
971
" status %d\n", proc->name,
972
(intmax_t) (proc->pid),
818
fprintf(stderr, "Plugin %u exited with status %d\n",
819
(unsigned int) (proc->pid),
973
820
WEXITSTATUS(proc->status));
974
} else if(WIFSIGNALED(proc->status)){
975
fprintf(stderr, "Plugin %s [%" PRIdMAX "] killed by"
976
" signal %d\n", proc->name,
977
(intmax_t) (proc->pid),
821
} else if(WIFSIGNALED(proc->status)) {
822
fprintf(stderr, "Plugin %u killed by signal %d\n",
823
(unsigned int) (proc->pid),
978
824
WTERMSIG(proc->status));
979
825
} else if(WCOREDUMP(proc->status)){
980
fprintf(stderr, "Plugin %s [%" PRIdMAX "] dumped"
981
" core\n", proc->name, (intmax_t) (proc->pid));
826
fprintf(stderr, "Plugin %d dumped core\n",
827
(unsigned int) (proc->pid));
982
828
}
983
829
}
984
985
830
/* Remove the plugin */
986
831
FD_CLR(proc->fd, &rfds_all);
987
988
832
/* Block signal while modifying process_list */
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
833
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
990
834
if(ret < 0){
991
835
perror("sigprocmask");
992
836
exitstatus = EXIT_FAILURE;
993
837
goto fallback;
994
838
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
839
/* Delete this process entry from the list */
840
if(process_list == proc){
841
/* First one - simple */
842
process_list = proc->next;
843
} else {
844
/* Second one or later */
845
for(process *p = process_list; p != NULL; p = p->next){
846
if(p->next == proc){
847
p->next = proc->next;
848
break;
849
}
850
}
851
}
1000
852
/* We are done modifying process list, so unblock signal */
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
853
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
854
NULL);
1003
855
if(ret < 0){
1004
856
perror("sigprocmask");
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
857
}
858
free(proc->buffer);
859
free(proc);
860
/* We deleted this process from the list, so we can't go
861
proc->next. Therefore, start over from the beginning of
862
the process list */
863
break;
1014
864
}
1015
1016
865
/* This process exited nicely, so print its buffer */
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
866
867
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1020
868
if(not bret){
1021
869
perror("print_out_password");
1022
870
exitstatus = EXIT_FAILURE;
1023
871
}
1024
872
goto fallback;
1025
873
}
1026
1027
874
/* This process has not completed. Does it have any output? */
1028
875
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1029
876
/* This process had nothing to say at this time */
1030
proc = proc->next;
1031
877
continue;
1032
878
}
1033
879
/* Before reading, make the process' data buffer large enough */
1034
880
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
1035
881
proc->buffer = realloc(proc->buffer, proc->buffer_size
1036
882
+ (size_t) BUFFER_SIZE);
1037
if(proc->buffer == NULL){
883
if (proc->buffer == NULL){
1038
884
perror("malloc");
1039
885
exitstatus = EXIT_FAILURE;
1040
886
goto fallback;
1042
888
proc->buffer_size += BUFFER_SIZE;
1043
889
}
1044
890
/* Read from the process */
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
891
ret = read(proc->fd, proc->buffer + proc->buffer_length,
892
BUFFER_SIZE);
893
if(ret < 0){
1048
894
/* Read error from this process; ignore the error */
1049
proc = proc->next;
1050
895
continue;
1051
896
}
1052
if(sret == 0){
897
if(ret == 0){
1053
898
/* got EOF */
1054
899
proc->eof = true;
1055
900
} else {
1056
proc->buffer_length += (size_t) sret;
901
proc->buffer_length += (size_t) ret;
1057
902
}
1058
903
}
1059
904
}
1060
1061
905
906
1062
907
fallback:
1063
908
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
909
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
910
/* Fallback if all plugins failed, none are found or an error occured */
1067
911
bool bret;
1068
912
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1069
913
char *passwordbuffer = getpass("Password: ");
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
914
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1077
915
if(not bret){
1078
916
perror("print_out_password");
1079
917
exitstatus = EXIT_FAILURE;
1086
924
perror("sigaction");
1087
925
exitstatus = EXIT_FAILURE;
1088
926
}
1089
927
1090
928
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
929
for(char **arg = custom_argv; *arg != NULL; arg++){
1092
930
free(*arg);
1093
931
}
1094
932
free(custom_argv);
1095
933
}
934
free_plugin_list(plugin_list);
1096
935
1097
936
if(dir != NULL){
1098
937
closedir(dir);
1099
938
}
1100
939
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
940
/* Free the process list and kill the processes */
941
for(process *next; process_list != NULL; process_list = next){
942
next = process_list->next;
943
close(process_list->fd);
944
ret = kill(process_list->pid, SIGTERM);
945
if(ret == -1 and errno != ESRCH){
946
/* set-uid proccesses migth not get closed */
947
perror("kill");
1110
948
}
949
free(process_list->buffer);
950
free(process_list);
1111
951
}
1112
952
1113
953
/* Wait for any remaining child processes to terminate */
1118
958
perror("wait");
1119
959
}
1120
960
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
1126
961
return exitstatus;
1127
962
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0