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- Committer: Teddy Hogeborn
- Date: 2008-08-10 17:52:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080810175254-pxjzwws523ji49n7
* Makefile (DOCBOOKTOMAN): Do not generate AUTHORS section.
- files added:
- network-protocol.txt
- files removed:
- .bzrignore
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- files modified:
- Makefile
added
removed
mandos-client.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
26
#include <stddef.h> /* size_t, NULL */
27
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
28
EXIT_SUCCESS, realloc() */
51
51
close() */
52
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
56
#include <errno.h> /* errno */
56
57
#include <argp.h> /* struct argp_option, struct
57
58
argp_state, struct argp,
58
59
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
61
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
62
sigaddset(), sigaction(),
63
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
66
66
67
67
#define BUFFER_SIZE 256
68
68
69
#define PDIR "/lib/mandos/plugins.d"
70
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
71
72
const char *argp_program_version = "plugin-runner 1.0";
69
const char *argp_program_version = "mandos-client 1.0";
73
70
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
71
75
struct plugin;
76
77
typedef struct plugin{
78
char *name; /* can be NULL or any plugin name */
79
char **argv;
80
int argc;
81
char **environ;
82
int envc;
83
bool disabled;
84
85
/* Variables used for running processes*/
72
struct process;
73
74
typedef struct process{
86
75
pid_t pid;
87
76
int fd;
88
77
char *buffer;
89
78
size_t buffer_size;
90
79
size_t buffer_length;
91
80
bool eof;
92
volatile bool completed;
93
volatile int status;
81
bool completed;
82
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
94
91
struct plugin *next;
95
92
} plugin;
96
93
97
static plugin *plugin_list = NULL;
98
99
/* Gets a 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){
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
96
if ((p->name == name)
105
97
or (p->name and name and (strcmp(p->name, name) == 0))){
106
98
return p;
109
101
/* Create a new plugin */
110
102
plugin *new_plugin = malloc(sizeof(plugin));
111
103
if (new_plugin == NULL){
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
127
108
new_plugin->argv = malloc(sizeof(char *) * 2);
128
109
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
110
perror("malloc");
111
exit(EXIT_FAILURE);
132
112
}
133
new_plugin->argv[0] = copy_name;
113
new_plugin->argv[0] = name;
134
114
new_plugin->argv[1] = NULL;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
145
118
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
119
*plugin_list = new_plugin;
147
120
return new_plugin;
148
121
}
149
122
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen+1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def));
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
204
132
}
205
133
206
134
/*
219
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
148
}
221
149
150
process *process_list = NULL;
222
151
223
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
224
153
status. */
225
154
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
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
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
}
295
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
305
171
}
306
172
307
173
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
311
175
size_t d_name_len;
312
176
DIR *dir = NULL;
313
177
struct dirent *dirst;
321
185
struct sigaction old_sigchld_action;
322
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
323
187
.sa_flags = SA_NOCLDSTOP };
324
char **custom_argv = NULL;
325
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
326
190
327
191
/* Establish a signal handler */
328
192
sigemptyset(&sigchld_action.sa_mask);
329
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
194
if(ret < 0){
331
195
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
196
exit(EXIT_FAILURE);
334
197
}
335
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
199
if(ret < 0){
337
200
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
201
exit(EXIT_FAILURE);
340
202
}
341
203
342
204
/* The options we understand. */
344
206
{ .name = "global-options", .key = 'g',
345
207
.arg = "OPTION[,OPTION[,...]]",
346
208
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'e',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
209
{ .name = "options-for", .key = 'o',
351
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
211
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'f',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
212
{ .name = "disable", .key = 'd',
357
213
.arg = "PLUGIN",
358
214
.doc = "Disable a specific plugin", .group = 1 },
359
215
{ .name = "plugin-dir", .key = 128,
360
216
.arg = "DIRECTORY",
361
217
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
218
{ .name = "userid", .key = 129,
219
.arg = "ID", .flags = 0,
220
.doc = "User ID the plugins will run as", .group = 2 },
221
{ .name = "groupid", .key = 130,
222
.arg = "ID", .flags = 0,
223
.doc = "Group ID the plugins will run as", .group = 2 },
224
{ .name = "debug", .key = 131,
225
.doc = "Debug mode", .group = 3 },
373
226
{ .name = NULL }
374
227
};
375
228
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
230
/* Get the INPUT argument from `argp_parse', which we know is a
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
378
233
switch (key) {
379
case 'g': /* --global-options */
380
if (arg != NULL){
381
char *p;
382
while((p = strsep(&arg, ",")) != NULL){
383
if(p[0] == '\0'){
384
continue;
385
}
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
390
}
391
}
392
break;
393
case 'e': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
{
398
char *envdef = strdup(arg);
399
if(envdef == NULL){
400
break;
401
}
402
if(not add_environment(getplugin(NULL), envdef, true)){
403
perror("add_environment");
404
}
405
}
406
break;
407
case 'o': /* --options-for */
408
if (arg != NULL){
409
char *p_name = strsep(&arg, ":");
410
if(p_name[0] == '\0'){
411
break;
412
}
413
char *opt = strsep(&arg, ":");
414
if(opt[0] == '\0'){
415
break;
416
}
417
if(opt != NULL){
418
char *p;
419
while((p = strsep(&opt, ",")) != NULL){
420
if(p[0] == '\0'){
421
continue;
422
}
423
if(not add_argument(getplugin(p_name), p)){
424
perror("add_argument");
425
return ARGP_ERR_UNKNOWN;
426
}
427
}
428
}
429
}
430
break;
431
case 'f': /* --env-for */
432
if(arg == NULL){
433
break;
434
}
435
{
436
char *envdef = strchr(arg, ':');
437
if(envdef == NULL){
438
break;
439
}
440
char *p_name = strndup(arg, (size_t) (envdef-arg));
441
if(p_name == NULL){
442
break;
443
}
444
envdef++;
445
if(not add_environment(getplugin(p_name), envdef, true)){
446
perror("add_environment");
447
}
448
}
449
break;
450
case 'd': /* --disable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = true;
457
}
458
break;
459
case 128: /* --plugin-dir */
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 */
234
case 'g':
235
if (arg != NULL){
236
char *p = strtok(arg, ",");
237
do{
238
addargument(getplugin(NULL, plugins), p);
239
p = strtok(NULL, ",");
240
} while (p != NULL);
241
}
242
break;
243
case 'o':
244
if (arg != NULL){
245
char *name = strtok(arg, ":");
246
char *p = strtok(NULL, ":");
247
if(p != NULL){
248
p = strtok(p, ",");
249
do{
250
addargument(getplugin(name, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
}
255
break;
256
case 'd':
257
if (arg != NULL){
258
getplugin(arg, plugins)->disabled = true;
259
}
260
break;
261
case 128:
262
plugindir = arg;
263
break;
264
case 129:
469
265
uid = (uid_t)strtol(arg, NULL, 10);
470
266
break;
471
case 131: /* --groupid */
267
case 130:
472
268
gid = (gid_t)strtol(arg, NULL, 10);
473
269
break;
474
case 132: /* --debug */
270
case 131:
475
271
debug = true;
476
272
break;
477
273
case ARGP_KEY_ARG:
478
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
479
break;
480
case ARGP_KEY_END:
481
break;
482
default:
483
return ARGP_ERR_UNKNOWN;
484
}
485
return 0;
486
}
487
488
/* This option parser is the same as parse_opt() above, except it
489
ignores everything but the --config-file option. */
490
error_t parse_opt_config_file (int key, char *arg,
491
__attribute__((unused))
492
struct argp_state *state) {
493
switch (key) {
494
case 'g': /* --global-options */
495
case 'e': /* --global-env */
496
case 'o': /* --options-for */
497
case 'f': /* --env-for */
498
case 'd': /* --disable */
499
case 128: /* --plugin-dir */
500
break;
501
case 129: /* --config-file */
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
505
276
}
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
277
plus_options = arg;
278
break;
511
279
case ARGP_KEY_END:
512
280
break;
513
281
default:
516
284
return 0;
517
285
}
518
286
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
287
plugin *plugin_list = NULL;
288
289
struct argp argp = { .options = options, .parser = parse_opt,
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
522
291
.doc = "Mandos plugin runner -- Run plugins" };
523
292
524
/* Parse using the parse_opt_config_file in order to get the custom
525
config file location, if any. */
526
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
527
294
if (ret == ARGP_ERR_UNKNOWN){
528
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
529
296
exitstatus = EXIT_FAILURE;
530
goto fallback;
297
goto end;
531
298
}
532
299
533
/* Reset to the normal argument parser */
534
argp.parser = parse_opt;
535
536
/* Open the configfile if available */
537
if (argfile == NULL){
538
conffp = fopen(AFILE, "r");
539
} else {
540
conffp = fopen(argfile, "r");
541
}
542
if(conffp != NULL){
543
char *org_line = NULL;
544
char *p, *arg, *new_arg, *line;
545
size_t size = 0;
546
ssize_t sret;
547
const char whitespace_delims[] = " \r\t\f\v\n";
548
const char comment_delim[] = "#";
549
550
custom_argc = 1;
551
custom_argv = malloc(sizeof(char*) * 2);
552
if(custom_argv == NULL){
300
if(plus_options){
301
/* This is a mangled argument in the form of
302
"+--option+--other-option=parameter+--yet-another-option", etc */
303
/* Make new argc and argv vars, and call argp_parse() again. */
304
plus_options++; /* skip the first '+' character */
305
const char delims[] = "+";
306
char *arg;
307
int new_argc = 1;
308
plus_argv = malloc(sizeof(char*) * 2);
309
if(plus_argv == NULL){
553
310
perror("malloc");
554
311
exitstatus = EXIT_FAILURE;
555
goto fallback;
556
}
557
custom_argv[0] = argv[0];
558
custom_argv[1] = NULL;
559
560
/* for each line in the config file, strip whitespace and ignore
561
commented text */
562
while(true){
563
sret = getline(&org_line, &size, conffp);
564
if(sret == -1){
565
break;
566
}
567
568
line = org_line;
569
arg = strsep(&line, comment_delim);
570
while((p = strsep(&arg, whitespace_delims)) != NULL){
571
if(p[0] == '\0'){
572
continue;
573
}
574
new_arg = strdup(p);
575
if(new_arg == NULL){
576
perror("strdup");
577
exitstatus = EXIT_FAILURE;
578
free(org_line);
579
goto fallback;
580
}
581
582
custom_argc += 1;
583
custom_argv = realloc(custom_argv, sizeof(char *)
584
* ((unsigned int) custom_argc + 1));
585
if(custom_argv == NULL){
586
perror("realloc");
587
exitstatus = EXIT_FAILURE;
588
free(org_line);
589
goto fallback;
590
}
591
custom_argv[custom_argc-1] = new_arg;
592
custom_argv[custom_argc] = NULL;
593
}
594
}
595
free(org_line);
596
} else {
597
/* Check for harmful errors and go to fallback. Other errors might
598
not affect opening plugins */
599
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
600
perror("fopen");
601
exitstatus = EXIT_FAILURE;
602
goto fallback;
603
}
604
}
605
/* If there was any arguments from configuration file,
606
pass them to parser as command arguments */
607
if(custom_argv != NULL){
608
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
609
0, NULL);
312
goto end;
313
}
314
plus_argv[0] = argv[0];
315
plus_argv[1] = NULL;
316
arg = strtok(plus_options, delims); /* Get first argument */
317
while(arg != NULL){
318
new_argc++;
319
plus_argv = realloc(plus_argv, sizeof(char *)
320
* ((unsigned int) new_argc + 1));
321
if(plus_argv == NULL){
322
perror("realloc");
323
exitstatus = EXIT_FAILURE;
324
goto end;
325
}
326
plus_argv[new_argc-1] = arg;
327
plus_argv[new_argc] = NULL;
328
arg = strtok(NULL, delims); /* Get next argument */
329
}
330
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
610
331
if (ret == ARGP_ERR_UNKNOWN){
611
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
612
333
exitstatus = EXIT_FAILURE;
613
goto fallback;
334
goto end;
614
335
}
615
336
}
616
337
617
/* Parse actual command line arguments, to let them override the
618
config file */
619
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
620
if (ret == ARGP_ERR_UNKNOWN){
621
fprintf(stderr, "Unknown error while parsing arguments\n");
622
exitstatus = EXIT_FAILURE;
623
goto fallback;
624
}
625
626
338
if(debug){
627
339
for(plugin *p = plugin_list; p != NULL; p=p->next){
628
340
fprintf(stderr, "Plugin: %s has %d arguments\n",
630
342
for(char **a = p->argv; *a != NULL; a++){
631
343
fprintf(stderr, "\tArg: %s\n", *a);
632
344
}
633
fprintf(stderr, "...and %u environment variables\n", p->envc);
634
for(char **a = p->environ; *a != NULL; a++){
635
fprintf(stderr, "\t%s\n", *a);
636
}
637
345
}
638
346
}
639
347
640
/* Strip permissions down to nobody */
641
348
ret = setuid(uid);
642
349
if (ret == -1){
643
350
perror("setuid");
644
}
351
}
352
645
353
setgid(gid);
646
354
if (ret == -1){
647
355
perror("setgid");
648
356
}
649
357
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
358
dir = opendir(plugindir);
656
359
if(dir == NULL){
657
360
perror("Could not open plugin dir");
658
361
exitstatus = EXIT_FAILURE;
659
goto fallback;
362
goto end;
660
363
}
661
364
662
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
667
370
if(ret < 0){
668
371
perror("set_cloexec_flag");
669
372
exitstatus = EXIT_FAILURE;
670
goto fallback;
373
goto end;
671
374
}
672
375
}
673
376
}
674
377
675
378
FD_ZERO(&rfds_all);
676
379
677
/* Read and execute any executable in the plugin directory*/
678
380
while(true){
679
381
dirst = readdir(dir);
680
382
681
/* All directory entries have been processed */
383
// All directory entries have been processed
682
384
if(dirst == NULL){
683
385
if (errno == EBADF){
684
386
perror("readdir");
685
387
exitstatus = EXIT_FAILURE;
686
goto fallback;
388
goto end;
687
389
}
688
390
break;
689
391
}
690
392
691
393
d_name_len = strlen(dirst->d_name);
692
394
693
/* Ignore dotfiles, backup files and other junk */
395
// Ignore dotfiles, backup files and other junk
694
396
{
695
397
bool bad_name = false;
696
398
711
413
break;
712
414
}
713
415
}
416
714
417
if(bad_name){
715
418
continue;
716
419
}
420
717
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
718
422
size_t suf_len = strlen(*suf);
719
423
if((d_name_len >= suf_len)
732
436
continue;
733
437
}
734
438
}
735
736
char *filename;
737
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
738
if(ret < 0){
739
perror("asprintf");
740
continue;
439
440
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
441
if (filename == NULL){
442
perror("malloc");
443
exitstatus = EXIT_FAILURE;
444
goto end;
741
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
742
449
743
450
ret = stat(filename, &st);
744
451
if (ret == -1){
745
452
perror("stat");
746
free(filename);
747
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
748
455
}
749
750
/* Ignore non-executable files */
456
751
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
752
458
if(debug){
753
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
756
462
free(filename);
757
463
continue;
758
464
}
759
760
plugin *p = getplugin(dirst->d_name);
761
if(p == NULL){
762
perror("getplugin");
763
free(filename);
764
continue;
765
}
766
if(p->disabled){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
767
466
if(debug){
768
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
769
468
dirst->d_name);
771
470
free(filename);
772
471
continue;
773
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
774
474
{
775
475
/* Add global arguments to argument list for this plugin */
776
plugin *g = getplugin(NULL);
777
if(g != NULL){
778
for(char **a = g->argv + 1; *a != NULL; a++){
779
if(not add_argument(p, *a)){
780
perror("add_argument");
781
}
782
}
783
/* Add global environment variables */
784
for(char **e = g->environ; *e != NULL; e++){
785
if(not add_environment(p, *e, false)){
786
perror("add_environment");
787
}
788
}
789
}
790
}
791
/* If this plugin has any environment variables, we will call
792
using execve and need to duplicate the environment from this
793
process, too. */
794
if(p->environ[0] != NULL){
795
for(char **e = environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
802
int pipefd[2];
476
plugin *g = getplugin(NULL, &plugin_list);
477
for(char **a = g->argv + 1; *a != NULL; a++){
478
addargument(p, *a);
479
}
480
}
481
int pipefd[2];
803
482
ret = pipe(pipefd);
804
483
if (ret == -1){
805
484
perror("pipe");
806
485
exitstatus = EXIT_FAILURE;
807
goto fallback;
486
goto end;
808
487
}
809
/* Ask OS to automatic close the pipe on exec */
810
488
ret = set_cloexec_flag(pipefd[0]);
811
489
if(ret < 0){
812
490
perror("set_cloexec_flag");
813
491
exitstatus = EXIT_FAILURE;
814
goto fallback;
492
goto end;
815
493
}
816
494
ret = set_cloexec_flag(pipefd[1]);
817
495
if(ret < 0){
818
496
perror("set_cloexec_flag");
819
497
exitstatus = EXIT_FAILURE;
820
goto fallback;
498
goto end;
821
499
}
822
500
/* Block SIGCHLD until process is safely in process list */
823
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
824
502
if(ret < 0){
825
503
perror("sigprocmask");
826
504
exitstatus = EXIT_FAILURE;
827
goto fallback;
505
goto end;
828
506
}
829
/* Starting a new process to be watched */
507
// Starting a new process to be watched
830
508
pid_t pid = fork();
831
if(pid == -1){
832
perror("fork");
833
exitstatus = EXIT_FAILURE;
834
goto fallback;
835
}
836
509
if(pid == 0){
837
510
/* this is the child process */
838
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
857
530
above and must now close it manually here. */
858
531
closedir(dir);
859
532
}
860
if(p->environ[0] == NULL){
861
if(execv(filename, p->argv) < 0){
862
perror("execv");
863
_exit(EXIT_FAILURE);
864
}
865
} else {
866
if(execve(filename, p->argv, p->environ) < 0){
867
perror("execve");
868
_exit(EXIT_FAILURE);
869
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
870
536
}
871
537
/* no return */
872
538
}
873
/* Parent process */
874
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
875
540
free(filename);
876
plugin *new_plugin = getplugin(dirst->d_name);
877
if (new_plugin == NULL){
878
perror("getplugin");
541
close(pipefd[1]); /* close unused write end of pipe */
542
process *new_process = malloc(sizeof(process));
543
if (new_process == NULL){
544
perror("malloc");
879
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
880
546
if(ret < 0){
881
perror("sigprocmask");
547
perror("sigprocmask");
882
548
}
883
549
exitstatus = EXIT_FAILURE;
884
goto fallback;
550
goto end;
885
551
}
886
552
887
new_plugin->pid = pid;
888
new_plugin->fd = pipefd[0];
889
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
890
558
/* Unblock SIGCHLD so signal handler can be run if this process
891
559
has already completed */
892
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
893
561
if(ret < 0){
894
562
perror("sigprocmask");
895
563
exitstatus = EXIT_FAILURE;
896
goto fallback;
897
}
898
899
FD_SET(new_plugin->fd, &rfds_all);
900
901
if (maxfd < new_plugin->fd){
902
maxfd = new_plugin->fd;
903
}
904
564
goto end;
565
}
566
567
FD_SET(new_process->fd, &rfds_all);
568
569
if (maxfd < new_process->fd){
570
maxfd = new_process->fd;
571
}
572
573
}
574
575
/* Free the plugin list */
576
for(plugin *next; plugin_list != NULL; plugin_list = next){
577
next = plugin_list->next;
578
free(plugin_list->argv);
579
free(plugin_list);
905
580
}
906
581
907
582
closedir(dir);
908
583
dir = NULL;
909
910
for(plugin *p = plugin_list; p != NULL; p = p->next){
911
if(p->pid != 0){
912
break;
913
}
914
if(p->next == NULL){
915
fprintf(stderr, "No plugin processes started. Incorrect plugin"
916
" directory?\n");
917
free_plugin_list();
918
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
919
589
}
920
921
/* Main loop while running plugins exist */
922
while(plugin_list){
590
while(process_list){
923
591
fd_set rfds = rfds_all;
924
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
925
593
if (select_ret == -1){
926
594
perror("select");
927
595
exitstatus = EXIT_FAILURE;
928
goto fallback;
596
goto end;
929
597
}
930
598
/* OK, now either a process completed, or something can be read
931
599
from one of them */
932
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
600
for(process *proc = process_list; proc ; proc = proc->next){
933
601
/* Is this process completely done? */
934
602
if(proc->eof and proc->completed){
935
603
/* Only accept the plugin output if it exited cleanly */
936
604
if(not WIFEXITED(proc->status)
937
605
or WEXITSTATUS(proc->status) != 0){
938
606
/* Bad exit by plugin */
939
940
607
if(debug){
941
608
if(WIFEXITED(proc->status)){
942
609
fprintf(stderr, "Plugin %u exited with status %d\n",
951
618
(unsigned int) (proc->pid));
952
619
}
953
620
}
954
955
621
/* Remove the plugin */
956
622
FD_CLR(proc->fd, &rfds_all);
957
958
623
/* Block signal while modifying process_list */
959
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
624
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
960
625
if(ret < 0){
961
626
perror("sigprocmask");
962
627
exitstatus = EXIT_FAILURE;
963
goto fallback;
964
}
965
free_plugin(proc);
628
goto end;
629
}
630
/* Delete this process entry from the list */
631
if(process_list == proc){
632
/* First one - simple */
633
process_list = proc->next;
634
} else {
635
/* Second one or later */
636
for(process *p = process_list; p != NULL; p = p->next){
637
if(p->next == proc){
638
p->next = proc->next;
639
break;
640
}
641
}
642
}
966
643
/* We are done modifying process list, so unblock signal */
967
644
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
968
645
NULL);
969
646
if(ret < 0){
970
647
perror("sigprocmask");
971
exitstatus = EXIT_FAILURE;
972
goto fallback;
973
}
974
975
if(plugin_list == NULL){
976
break;
977
}
978
continue;
648
}
649
free(proc->buffer);
650
free(proc);
651
/* We deleted this process from the list, so we can't go
652
proc->next. Therefore, start over from the beginning of
653
the process list */
654
break;
979
655
}
980
981
656
/* This process exited nicely, so print its buffer */
982
983
bool bret = print_out_password(proc->buffer,
984
proc->buffer_length);
985
if(not bret){
986
perror("print_out_password");
987
exitstatus = EXIT_FAILURE;
657
for(size_t written = 0; written < proc->buffer_length;
658
written += (size_t)ret){
659
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
660
proc->buffer + written,
661
proc->buffer_length
662
- written));
663
if(ret < 0){
664
perror("write");
665
exitstatus = EXIT_FAILURE;
666
goto end;
667
}
988
668
}
989
goto fallback;
669
goto end;
990
670
}
991
992
671
/* This process has not completed. Does it have any output? */
993
672
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
994
673
/* This process had nothing to say at this time */
1001
680
if (proc->buffer == NULL){
1002
681
perror("malloc");
1003
682
exitstatus = EXIT_FAILURE;
1004
goto fallback;
683
goto end;
1005
684
}
1006
685
proc->buffer_size += BUFFER_SIZE;
1007
686
}
1020
699
}
1021
700
}
1022
701
}
1023
1024
1025
fallback:
1026
1027
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1028
/* Fallback if all plugins failed, none are found or an error
1029
occured */
1030
bool bret;
1031
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1032
char *passwordbuffer = getpass("Password: ");
1033
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1034
if(not bret){
1035
perror("print_out_password");
1036
exitstatus = EXIT_FAILURE;
1037
}
702
if(process_list == NULL){
703
fprintf(stderr, "All plugin processes failed, exiting\n");
704
exitstatus = EXIT_FAILURE;
1038
705
}
1039
706
707
end:
1040
708
/* Restore old signal handler */
1041
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1042
if(ret == -1){
1043
perror("sigaction");
1044
exitstatus = EXIT_FAILURE;
1045
}
1046
1047
if(custom_argv != NULL){
1048
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1049
free(*arg);
1050
}
1051
free(custom_argv);
709
sigaction(SIGCHLD, &old_sigchld_action, NULL);
710
711
free(plus_argv);
712
713
/* Free the plugin list */
714
for(plugin *next; plugin_list != NULL; plugin_list = next){
715
next = plugin_list->next;
716
free(plugin_list->argv);
717
free(plugin_list);
1052
718
}
1053
719
1054
720
if(dir != NULL){
1056
722
}
1057
723
1058
724
/* Free the process list and kill the processes */
1059
for(plugin *p = plugin_list; p != NULL; p = p->next){
1060
if(p->pid != 0){
1061
close(p->fd);
1062
ret = kill(p->pid, SIGTERM);
1063
if(ret == -1 and errno != ESRCH){
1064
/* Set-uid proccesses might not get closed */
1065
perror("kill");
1066
}
725
for(process *next; process_list != NULL; process_list = next){
726
next = process_list->next;
727
close(process_list->fd);
728
ret = kill(process_list->pid, SIGTERM);
729
if(ret == -1 and errno != ESRCH){
730
/* set-uid proccesses migth not get closed */
731
perror("kill");
1067
732
}
733
free(process_list->buffer);
734
free(process_list);
1068
735
}
1069
736
1070
737
/* Wait for any remaining child processes to terminate */
1074
741
if(errno != ECHILD){
1075
742
perror("wait");
1076
743
}
1077
1078
free_plugin_list();
1079
1080
free(plugindir);
1081
free(argfile);
1082
744
1083
745
return exitstatus;
1084
746
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0