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- Committer: Björn Påhlsson
- Date: 2008-08-10 18:06:45 UTC
- mfrom: (62 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810180645-3mq1p3a8ufqnql0g
merge
- 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){
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
/* Refuse to add an existing variable */
192
return true;
193
}
194
}
195
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;
196
132
}
197
133
198
134
/*
211
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
212
148
}
213
149
150
process *process_list = NULL;
214
151
215
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
216
153
status. */
217
154
void handle_sigchld(__attribute__((unused)) int sig){
218
while(true){
219
plugin *proc = plugin_list;
220
int status;
221
pid_t pid = waitpid(-1, &status, WNOHANG);
222
if(pid == 0){
223
/* Only still running child processes */
224
break;
225
}
226
if(pid == -1){
227
if (errno != ECHILD){
228
perror("waitpid");
229
}
230
/* No child processes */
231
break;
232
}
233
234
/* A child exited, find it in process_list */
235
while(proc != NULL and proc->pid != pid){
236
proc = proc->next;
237
}
238
if(proc == NULL){
239
/* Process not found in process list */
240
continue;
241
}
242
proc->status = status;
243
proc->completed = true;
244
}
245
}
246
247
/* Prints out a password to stdout */
248
bool print_out_password(const char *buffer, size_t length){
249
ssize_t ret;
250
if(length>0 and buffer[length-1] == '\n'){
251
length--;
252
}
253
for(size_t written = 0; written < length; written += (size_t)ret){
254
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
255
length - written));
256
if(ret < 0){
257
return false;
258
}
259
}
260
return true;
261
}
262
263
/* Removes and free a plugin from the plugin list */
264
static void free_plugin(plugin *plugin_node){
265
266
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
267
free(*arg);
268
}
269
free(plugin_node->argv);
270
for(char **env = plugin_node->environ; *env != NULL; env++){
271
free(*env);
272
}
273
free(plugin_node->environ);
274
free(plugin_node->buffer);
275
276
/* Removes the plugin from the singly-linked list */
277
if(plugin_node == plugin_list){
278
/* First one - simple */
279
plugin_list = plugin_list->next;
280
} else {
281
/* Second one or later */
282
for(plugin *p = plugin_list; p != NULL; p = p->next){
283
if(p->next == plugin_node){
284
p->next = plugin_node->next;
285
break;
286
}
287
}
288
}
289
290
free(plugin_node);
291
}
292
293
static void free_plugin_list(void){
294
while(plugin_list != NULL){
295
free_plugin(plugin_list);
296
}
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;
297
171
}
298
172
299
173
int main(int argc, char *argv[]){
300
char *plugindir = NULL;
301
char *argfile = NULL;
302
FILE *conffp;
174
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
303
175
size_t d_name_len;
304
176
DIR *dir = NULL;
305
177
struct dirent *dirst;
313
185
struct sigaction old_sigchld_action;
314
186
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
315
187
.sa_flags = SA_NOCLDSTOP };
316
char **custom_argv = NULL;
317
int custom_argc = 0;
188
char *plus_options = NULL;
189
char **plus_argv = NULL;
318
190
319
191
/* Establish a signal handler */
320
192
sigemptyset(&sigchld_action.sa_mask);
321
193
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
322
if(ret == -1){
194
if(ret < 0){
323
195
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
325
goto fallback;
196
exit(EXIT_FAILURE);
326
197
}
327
198
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
328
if(ret == -1){
199
if(ret < 0){
329
200
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
201
exit(EXIT_FAILURE);
332
202
}
333
203
334
204
/* The options we understand. */
336
206
{ .name = "global-options", .key = 'g',
337
207
.arg = "OPTION[,OPTION[,...]]",
338
208
.doc = "Options passed to all plugins" },
339
{ .name = "global-env", .key = 'e',
340
.arg = "VAR=value",
341
.doc = "Environment variable passed to all plugins" },
342
209
{ .name = "options-for", .key = 'o',
343
210
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
211
.doc = "Options passed only to specified plugin" },
345
{ .name = "env-for", .key = 'f',
346
.arg = "PLUGIN:ENV=value",
347
.doc = "Environment variable passed to specified plugin" },
348
212
{ .name = "disable", .key = 'd',
349
213
.arg = "PLUGIN",
350
214
.doc = "Disable a specific plugin", .group = 1 },
351
215
{ .name = "plugin-dir", .key = 128,
352
216
.arg = "DIRECTORY",
353
217
.doc = "Specify a different plugin directory", .group = 2 },
354
{ .name = "config-file", .key = 129,
355
.arg = "FILE",
356
.doc = "Specify a different configuration file", .group = 2 },
357
{ .name = "userid", .key = 130,
358
.arg = "ID", .flags = 0,
359
.doc = "User ID the plugins will run as", .group = 3 },
360
{ .name = "groupid", .key = 131,
361
.arg = "ID", .flags = 0,
362
.doc = "Group ID the plugins will run as", .group = 3 },
363
{ .name = "debug", .key = 132,
364
.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 },
365
226
{ .name = NULL }
366
227
};
367
228
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
229
error_t parse_opt (int key, char *arg, struct argp_state *state) {
370
230
/* Get the INPUT argument from `argp_parse', which we know is a
371
231
pointer to our plugin list pointer. */
232
plugin **plugins = state->input;
372
233
switch (key) {
373
case 'g': /* --global-options */
374
if (arg != NULL){
375
char *p;
376
while((p = strsep(&arg, ",")) != NULL){
377
if(p[0] == '\0'){
378
continue;
379
}
380
if(not add_argument(getplugin(NULL), p)){
381
perror("add_argument");
382
return ARGP_ERR_UNKNOWN;
383
}
384
}
385
}
386
break;
387
case 'e': /* --global-env */
388
if(arg == NULL){
389
break;
390
}
391
{
392
char *envdef = strdup(arg);
393
if(envdef == NULL){
394
break;
395
}
396
if(not add_environment(getplugin(NULL), envdef)){
397
perror("add_environment");
398
}
399
}
400
break;
401
case 'o': /* --options-for */
402
if (arg != NULL){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0'){
405
break;
406
}
407
char *opt = strsep(&arg, ":");
408
if(opt[0] == '\0'){
409
break;
410
}
411
if(opt != NULL){
412
char *p;
413
while((p = strsep(&opt, ",")) != NULL){
414
if(p[0] == '\0'){
415
continue;
416
}
417
if(not add_argument(getplugin(p_name), p)){
418
perror("add_argument");
419
return ARGP_ERR_UNKNOWN;
420
}
421
}
422
}
423
}
424
break;
425
case 'f': /* --env-for */
426
if(arg == NULL){
427
break;
428
}
429
{
430
char *envdef = strchr(arg, ':');
431
if(envdef == NULL){
432
break;
433
}
434
char *p_name = strndup(arg, (size_t) (envdef-arg));
435
if(p_name == NULL){
436
break;
437
}
438
envdef++;
439
if(not add_environment(getplugin(p_name), envdef)){
440
perror("add_environment");
441
}
442
}
443
break;
444
case 'd': /* --disable */
445
if (arg != NULL){
446
plugin *p = getplugin(arg);
447
if(p == NULL){
448
return ARGP_ERR_UNKNOWN;
449
}
450
p->disabled = true;
451
}
452
break;
453
case 128: /* --plugin-dir */
454
plugindir = strdup(arg);
455
if(plugindir == NULL){
456
perror("strdup");
457
}
458
break;
459
case 129: /* --config-file */
460
argfile = strdup(arg);
461
if(argfile == NULL){
462
perror("strdup");
463
}
464
break;
465
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:
466
265
uid = (uid_t)strtol(arg, NULL, 10);
467
266
break;
468
case 131: /* --groupid */
267
case 130:
469
268
gid = (gid_t)strtol(arg, NULL, 10);
470
269
break;
471
case 132: /* --debug */
270
case 131:
472
271
debug = true;
473
272
break;
474
273
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
274
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
275
argp_usage (state);
276
}
277
plus_options = arg;
476
278
break;
477
279
case ARGP_KEY_END:
478
280
break;
482
284
return 0;
483
285
}
484
286
287
plugin *plugin_list = NULL;
288
485
289
struct argp argp = { .options = options, .parser = parse_opt,
486
290
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
487
291
.doc = "Mandos plugin runner -- Run plugins" };
488
292
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
293
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
490
294
if (ret == ARGP_ERR_UNKNOWN){
491
fprintf(stderr, "Unknown error while parsing arguments\n");
295
fprintf(stderr, "Unkown error while parsing arguments\n");
492
296
exitstatus = EXIT_FAILURE;
493
goto fallback;
297
goto end;
494
298
}
495
496
/* Opens the configfile if aviable */
497
if (argfile == NULL){
498
conffp = fopen(AFILE, "r");
499
} else {
500
conffp = fopen(argfile, "r");
501
}
502
if(conffp != NULL){
503
char *org_line = NULL;
504
char *p, *arg, *new_arg, *line;
505
size_t size = 0;
506
ssize_t sret;
507
const char whitespace_delims[] = " \r\t\f\v\n";
508
const char comment_delim[] = "#";
509
510
custom_argc = 1;
511
custom_argv = malloc(sizeof(char*) * 2);
512
if(custom_argv == NULL){
299
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){
513
310
perror("malloc");
514
311
exitstatus = EXIT_FAILURE;
515
goto fallback;
516
}
517
custom_argv[0] = argv[0];
518
custom_argv[1] = NULL;
519
520
/* for each line in the config file, strip whitespace and ignore
521
commented text */
522
while(true){
523
sret = getline(&org_line, &size, conffp);
524
if(sret == -1){
525
break;
526
}
527
528
line = org_line;
529
arg = strsep(&line, comment_delim);
530
while((p = strsep(&arg, whitespace_delims)) != NULL){
531
if(p[0] == '\0'){
532
continue;
533
}
534
new_arg = strdup(p);
535
if(new_arg == NULL){
536
perror("strdup");
537
exitstatus = EXIT_FAILURE;
538
free(org_line);
539
goto fallback;
540
}
541
542
custom_argc += 1;
543
custom_argv = realloc(custom_argv, sizeof(char *)
544
* ((unsigned int) custom_argc + 1));
545
if(custom_argv == NULL){
546
perror("realloc");
547
exitstatus = EXIT_FAILURE;
548
free(org_line);
549
goto fallback;
550
}
551
custom_argv[custom_argc-1] = new_arg;
552
custom_argv[custom_argc] = NULL;
553
}
554
}
555
free(org_line);
556
} else{
557
/* Check for harmful errors and go to fallback. Other errors might
558
not affect opening plugins */
559
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
560
perror("fopen");
561
exitstatus = EXIT_FAILURE;
562
goto fallback;
563
}
564
}
565
/* If there was any arguments from configuration file,
566
pass them to parser as command arguments */
567
if(custom_argv != NULL){
568
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 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);
569
331
if (ret == ARGP_ERR_UNKNOWN){
570
fprintf(stderr, "Unknown error while parsing arguments\n");
332
fprintf(stderr, "Unkown error while parsing arguments\n");
571
333
exitstatus = EXIT_FAILURE;
572
goto fallback;
334
goto end;
573
335
}
574
336
}
575
337
580
342
for(char **a = p->argv; *a != NULL; a++){
581
343
fprintf(stderr, "\tArg: %s\n", *a);
582
344
}
583
fprintf(stderr, "...and %u environment variables\n", p->envc);
584
for(char **a = p->environ; *a != NULL; a++){
585
fprintf(stderr, "\t%s\n", *a);
586
}
587
345
}
588
346
}
589
590
/* Strip permissions down to nobody */
347
591
348
ret = setuid(uid);
592
349
if (ret == -1){
593
350
perror("setuid");
594
}
351
}
352
595
353
setgid(gid);
596
354
if (ret == -1){
597
355
perror("setgid");
598
356
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
357
358
dir = opendir(plugindir);
606
359
if(dir == NULL){
607
360
perror("Could not open plugin dir");
608
361
exitstatus = EXIT_FAILURE;
609
goto fallback;
362
goto end;
610
363
}
611
364
612
365
/* Set the FD_CLOEXEC flag on the directory, if possible */
617
370
if(ret < 0){
618
371
perror("set_cloexec_flag");
619
372
exitstatus = EXIT_FAILURE;
620
goto fallback;
373
goto end;
621
374
}
622
375
}
623
376
}
624
377
625
378
FD_ZERO(&rfds_all);
626
627
/* Read and execute any executable in the plugin directory*/
379
628
380
while(true){
629
381
dirst = readdir(dir);
630
382
633
385
if (errno == EBADF){
634
386
perror("readdir");
635
387
exitstatus = EXIT_FAILURE;
636
goto fallback;
388
goto end;
637
389
}
638
390
break;
639
391
}
661
413
break;
662
414
}
663
415
}
416
664
417
if(bad_name){
665
418
continue;
666
419
}
420
667
421
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
422
size_t suf_len = strlen(*suf);
669
423
if((d_name_len >= suf_len)
682
436
continue;
683
437
}
684
438
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
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;
691
445
}
446
strcpy(filename, plugindir); /* Spurious warning */
447
strcat(filename, "/"); /* Spurious warning */
448
strcat(filename, dirst->d_name); /* Spurious warning */
692
449
693
450
ret = stat(filename, &st);
694
451
if (ret == -1){
695
452
perror("stat");
696
free(filename);
697
continue;
453
exitstatus = EXIT_FAILURE;
454
goto end;
698
455
}
699
700
/* Ignore non-executable files */
456
701
457
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
702
458
if(debug){
703
459
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
706
462
free(filename);
707
463
continue;
708
464
}
709
710
plugin *p = getplugin(dirst->d_name);
711
if(p == NULL){
712
perror("getplugin");
713
free(filename);
714
continue;
715
}
716
if(p->disabled){
465
if(getplugin(dirst->d_name, &plugin_list)->disabled){
717
466
if(debug){
718
467
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
719
468
dirst->d_name);
721
470
free(filename);
722
471
continue;
723
472
}
473
plugin *p = getplugin(dirst->d_name, &plugin_list);
724
474
{
725
475
/* Add global arguments to argument list for this plugin */
726
plugin *g = getplugin(NULL);
727
if(g != NULL){
728
for(char **a = g->argv + 1; *a != NULL; a++){
729
if(not add_argument(p, *a)){
730
perror("add_argument");
731
}
732
}
733
/* Add global environment variables */
734
for(char **e = g->environ; *e != NULL; e++){
735
if(not add_environment(p, *e)){
736
perror("add_environment");
737
}
738
}
739
}
740
}
741
/* If this plugin has any environment variables, we will call
742
using execve and need to duplicate the environment from this
743
process, too. */
744
if(p->environ[0] != NULL){
745
for(char **e = environ; *e != NULL; e++){
746
char *copy = strdup(*e);
747
if(copy == NULL){
748
perror("strdup");
749
continue;
750
}
751
if(not add_environment(p, copy)){
752
perror("add_environment");
753
}
754
}
755
}
756
757
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];
758
482
ret = pipe(pipefd);
759
483
if (ret == -1){
760
484
perror("pipe");
761
485
exitstatus = EXIT_FAILURE;
762
goto fallback;
486
goto end;
763
487
}
764
/* Ask OS to automatic close the pipe on exec */
765
488
ret = set_cloexec_flag(pipefd[0]);
766
489
if(ret < 0){
767
490
perror("set_cloexec_flag");
768
491
exitstatus = EXIT_FAILURE;
769
goto fallback;
492
goto end;
770
493
}
771
494
ret = set_cloexec_flag(pipefd[1]);
772
495
if(ret < 0){
773
496
perror("set_cloexec_flag");
774
497
exitstatus = EXIT_FAILURE;
775
goto fallback;
498
goto end;
776
499
}
777
500
/* Block SIGCHLD until process is safely in process list */
778
501
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
779
502
if(ret < 0){
780
503
perror("sigprocmask");
781
504
exitstatus = EXIT_FAILURE;
782
goto fallback;
505
goto end;
783
506
}
784
507
// Starting a new process to be watched
785
508
pid_t pid = fork();
786
if(pid == -1){
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
789
goto fallback;
790
}
791
509
if(pid == 0){
792
510
/* this is the child process */
793
511
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
812
530
above and must now close it manually here. */
813
531
closedir(dir);
814
532
}
815
if(p->environ[0] == NULL){
816
if(execv(filename, p->argv) < 0){
817
perror("execv");
818
_exit(EXIT_FAILURE);
819
}
820
} else {
821
if(execve(filename, p->argv, p->environ) < 0){
822
perror("execve");
823
_exit(EXIT_FAILURE);
824
}
533
if(execv(filename, p->argv) < 0){
534
perror("execv");
535
_exit(EXIT_FAILURE);
825
536
}
826
537
/* no return */
827
538
}
828
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
539
/* parent process */
830
540
free(filename);
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
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");
834
545
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
835
546
if(ret < 0){
836
perror("sigprocmask");
547
perror("sigprocmask");
837
548
}
838
549
exitstatus = EXIT_FAILURE;
839
goto fallback;
550
goto end;
840
551
}
841
552
842
new_plugin->pid = pid;
843
new_plugin->fd = pipefd[0];
844
553
*new_process = (struct process){ .pid = pid,
554
.fd = pipefd[0],
555
.next = process_list };
556
// List handling
557
process_list = new_process;
845
558
/* Unblock SIGCHLD so signal handler can be run if this process
846
559
has already completed */
847
560
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
848
561
if(ret < 0){
849
562
perror("sigprocmask");
850
563
exitstatus = EXIT_FAILURE;
851
goto fallback;
852
}
853
854
FD_SET(new_plugin->fd, &rfds_all);
855
856
if (maxfd < new_plugin->fd){
857
maxfd = new_plugin->fd;
858
}
859
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);
860
580
}
861
581
862
582
closedir(dir);
863
583
dir = NULL;
864
865
for(plugin *p = plugin_list; p != NULL; p = p->next){
866
if(p->pid != 0){
867
break;
868
}
869
if(p->next == NULL){
870
fprintf(stderr, "No plugin processes started. Incorrect plugin"
871
" directory?\n");
872
free_plugin_list();
873
}
584
585
if (process_list == NULL){
586
fprintf(stderr, "No plugin processes started, exiting\n");
587
exitstatus = EXIT_FAILURE;
588
goto end;
874
589
}
875
876
/* Main loop while running plugins exist */
877
while(plugin_list){
590
while(process_list){
878
591
fd_set rfds = rfds_all;
879
592
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
593
if (select_ret == -1){
881
594
perror("select");
882
595
exitstatus = EXIT_FAILURE;
883
goto fallback;
596
goto end;
884
597
}
885
598
/* OK, now either a process completed, or something can be read
886
599
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
600
for(process *proc = process_list; proc ; proc = proc->next){
888
601
/* Is this process completely done? */
889
602
if(proc->eof and proc->completed){
890
603
/* Only accept the plugin output if it exited cleanly */
891
604
if(not WIFEXITED(proc->status)
892
605
or WEXITSTATUS(proc->status) != 0){
893
606
/* Bad exit by plugin */
894
895
607
if(debug){
896
608
if(WIFEXITED(proc->status)){
897
609
fprintf(stderr, "Plugin %u exited with status %d\n",
906
618
(unsigned int) (proc->pid));
907
619
}
908
620
}
909
910
621
/* Remove the plugin */
911
622
FD_CLR(proc->fd, &rfds_all);
912
913
623
/* Block signal while modifying process_list */
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
624
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
915
625
if(ret < 0){
916
626
perror("sigprocmask");
917
627
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
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
}
921
643
/* We are done modifying process list, so unblock signal */
922
644
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
645
NULL);
924
646
if(ret < 0){
925
647
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
927
goto fallback;
928
}
929
930
if(plugin_list == NULL){
931
break;
932
}
933
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;
934
655
}
935
936
656
/* This process exited nicely, so print its buffer */
937
938
bool bret = print_out_password(proc->buffer,
939
proc->buffer_length);
940
if(not bret){
941
perror("print_out_password");
942
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
}
943
668
}
944
goto fallback;
669
goto end;
945
670
}
946
947
671
/* This process has not completed. Does it have any output? */
948
672
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
949
673
/* This process had nothing to say at this time */
956
680
if (proc->buffer == NULL){
957
681
perror("malloc");
958
682
exitstatus = EXIT_FAILURE;
959
goto fallback;
683
goto end;
960
684
}
961
685
proc->buffer_size += BUFFER_SIZE;
962
686
}
975
699
}
976
700
}
977
701
}
978
979
980
fallback:
981
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
983
/* Fallback if all plugins failed, none are found or an error
984
occured */
985
bool bret;
986
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
char *passwordbuffer = getpass("Password: ");
988
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
989
if(not bret){
990
perror("print_out_password");
991
exitstatus = EXIT_FAILURE;
992
}
702
if(process_list == NULL){
703
fprintf(stderr, "All plugin processes failed, exiting\n");
704
exitstatus = EXIT_FAILURE;
993
705
}
994
706
707
end:
995
708
/* Restore old signal handler */
996
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
997
if(ret == -1){
998
perror("sigaction");
999
exitstatus = EXIT_FAILURE;
1000
}
1001
1002
if(custom_argv != NULL){
1003
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1004
free(*arg);
1005
}
1006
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);
1007
718
}
1008
719
1009
720
if(dir != NULL){
1011
722
}
1012
723
1013
724
/* Free the process list and kill the processes */
1014
for(plugin *p = plugin_list; p != NULL; p = p->next){
1015
if(p->pid != 0){
1016
close(p->fd);
1017
ret = kill(p->pid, SIGTERM);
1018
if(ret == -1 and errno != ESRCH){
1019
/* Set-uid proccesses might not get closed */
1020
perror("kill");
1021
}
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");
1022
732
}
733
free(process_list->buffer);
734
free(process_list);
1023
735
}
1024
736
1025
737
/* Wait for any remaining child processes to terminate */
1029
741
if(errno != ECHILD){
1030
742
perror("wait");
1031
743
}
1032
1033
free_plugin_list();
1034
1035
free(plugindir);
1036
free(argfile);
1037
744
1038
745
return exitstatus;
1039
746
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0