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- Committer: Teddy Hogeborn
- Date: 2008-09-07 01:44:44 UTC
- mfrom: (24.1.93 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080907014444-cf4ilzndc0tbn8va
Merge & resolve.
- files added:
- .bzrignore
- files removed:
- network-protocol.txt
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
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(), strcpy(),
55
strcat() */
54
#include <string.h> /* strsep, strlen(), asprintf() */
56
55
#include <errno.h> /* errno */
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, error_t */
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
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
69
72
const char *argp_program_version = "plugin-runner 1.0";
70
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
74
72
struct process;
73
74
typedef struct process{
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*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
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;
92
volatile bool completed;
93
volatile int status;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
96
104
if ((p->name == name)
97
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
111
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
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
108
127
new_plugin->argv = malloc(sizeof(char *) * 2);
109
128
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
112
132
}
113
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
114
134
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
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
118
145
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
120
147
return new_plugin;
121
148
}
122
149
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;
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) + 1);
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));
132
204
}
133
205
134
206
/*
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
225
void handle_sigchld(__attribute__((unused)) int sig){
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;
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
}
171
253
}
172
254
255
/* Prints out a password to stdout */
173
256
bool print_out_password(const char *buffer, size_t length){
174
257
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
258
for(size_t written = 0; written < length; written += (size_t)ret){
179
259
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
260
length - written));
185
265
return true;
186
266
}
187
267
268
/* Removes and free a plugin from the plugin list */
269
static void free_plugin(plugin *plugin_node){
270
271
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
272
free(*arg);
273
}
274
free(plugin_node->argv);
275
for(char **env = plugin_node->environ; *env != NULL; env++){
276
free(*env);
277
}
278
free(plugin_node->environ);
279
free(plugin_node->buffer);
280
281
/* Removes the plugin from the singly-linked list */
282
if(plugin_node == plugin_list){
283
/* First one - simple */
284
plugin_list = plugin_list->next;
285
} else {
286
/* Second one or later */
287
for(plugin *p = plugin_list; p != NULL; p = p->next){
288
if(p->next == plugin_node){
289
p->next = plugin_node->next;
290
break;
291
}
292
}
293
}
294
295
free(plugin_node);
296
}
297
298
static void free_plugin_list(void){
299
while(plugin_list != NULL){
300
free_plugin(plugin_list);
301
}
302
}
303
188
304
int main(int argc, char *argv[]){
189
const char *plugindir = "/lib/mandos/plugins.d";
305
char *plugindir = NULL;
306
char *argfile = NULL;
307
FILE *conffp;
190
308
size_t d_name_len;
191
309
DIR *dir = NULL;
192
310
struct dirent *dirst;
200
318
struct sigaction old_sigchld_action;
201
319
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
320
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
321
char **custom_argv = NULL;
322
int custom_argc = 0;
323
206
324
/* Establish a signal handler */
207
325
sigemptyset(&sigchld_action.sa_mask);
208
326
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
327
if(ret == -1){
210
328
perror("sigaddset");
211
exit(EXIT_FAILURE);
329
exitstatus = EXIT_FAILURE;
330
goto fallback;
212
331
}
213
332
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
333
if(ret == -1){
215
334
perror("sigaction");
216
exit(EXIT_FAILURE);
335
exitstatus = EXIT_FAILURE;
336
goto fallback;
217
337
}
218
338
219
339
/* The options we understand. */
221
341
{ .name = "global-options", .key = 'g',
222
342
.arg = "OPTION[,OPTION[,...]]",
223
343
.doc = "Options passed to all plugins" },
344
{ .name = "global-env", .key = 'G',
345
.arg = "VAR=value",
346
.doc = "Environment variable passed to all plugins" },
224
347
{ .name = "options-for", .key = 'o',
225
348
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
349
.doc = "Options passed only to specified plugin" },
350
{ .name = "env-for", .key = 'E',
351
.arg = "PLUGIN:ENV=value",
352
.doc = "Environment variable passed to specified plugin" },
227
353
{ .name = "disable", .key = 'd',
228
354
.arg = "PLUGIN",
229
355
.doc = "Disable a specific plugin", .group = 1 },
356
{ .name = "enable", .key = 'e',
357
.arg = "PLUGIN",
358
.doc = "Enable a specific plugin", .group = 1 },
230
359
{ .name = "plugin-dir", .key = 128,
231
360
.arg = "DIRECTORY",
232
361
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
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 },
241
373
{ .name = NULL }
242
374
};
243
375
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
248
378
switch (key) {
249
case 'g':
379
case 'g': /* --global-options */
250
380
if (arg != NULL){
251
381
char *p;
252
382
while((p = strsep(&arg, ",")) != NULL){
253
if(strcmp(p, "") == 0){
383
if(p[0] == '\0'){
254
384
continue;
255
385
}
256
addargument(getplugin(NULL, plugins), p);
386
if(not add_argument(getplugin(NULL), p)){
387
perror("add_argument");
388
return ARGP_ERR_UNKNOWN;
389
}
257
390
}
258
391
}
259
392
break;
260
case 'o':
393
case 'G': /* --global-env */
394
if(arg == NULL){
395
break;
396
}
397
if(not add_environment(getplugin(NULL), arg, true)){
398
perror("add_environment");
399
}
400
break;
401
case 'o': /* --options-for */
261
402
if (arg != NULL){
262
char *name = strsep(&arg, ":");
263
if(strcmp(name, "") == 0){
403
char *p_name = strsep(&arg, ":");
404
if(p_name[0] == '\0' or arg == NULL){
264
405
break;
265
406
}
266
407
char *opt = strsep(&arg, ":");
267
if(strcmp(opt, "") == 0){
268
break;
269
}
270
if(opt != NULL){
271
char *p;
272
while((p = strsep(&opt, ",")) != NULL){
273
if(strcmp(p, "") == 0){
274
continue;
275
}
276
addargument(getplugin(name, plugins), p);
277
}
278
}
279
}
280
break;
281
case 'd':
282
if (arg != NULL){
283
getplugin(arg, plugins)->disabled = true;
284
}
285
break;
286
case 128:
287
plugindir = arg;
288
break;
289
case 129:
408
if(opt[0] == '\0' or opt == NULL){
409
break;
410
}
411
char *p;
412
while((p = strsep(&opt, ",")) != NULL){
413
if(p[0] == '\0'){
414
continue;
415
}
416
if(not add_argument(getplugin(p_name), p)){
417
perror("add_argument");
418
return ARGP_ERR_UNKNOWN;
419
}
420
}
421
}
422
break;
423
case 'E': /* --env-for */
424
if(arg == NULL){
425
break;
426
}
427
{
428
char *envdef = strchr(arg, ':');
429
if(envdef == NULL){
430
break;
431
}
432
*envdef = '\0';
433
if(not add_environment(getplugin(arg), envdef+1, true)){
434
perror("add_environment");
435
}
436
}
437
break;
438
case 'd': /* --disable */
439
if (arg != NULL){
440
plugin *p = getplugin(arg);
441
if(p == NULL){
442
return ARGP_ERR_UNKNOWN;
443
}
444
p->disabled = true;
445
}
446
break;
447
case 'e': /* --enable */
448
if (arg != NULL){
449
plugin *p = getplugin(arg);
450
if(p == NULL){
451
return ARGP_ERR_UNKNOWN;
452
}
453
p->disabled = false;
454
}
455
break;
456
case 128: /* --plugin-dir */
457
free(plugindir);
458
plugindir = strdup(arg);
459
if(plugindir == NULL){
460
perror("strdup");
461
}
462
break;
463
case 129: /* --config-file */
464
/* This is already done by parse_opt_config_file() */
465
break;
466
case 130: /* --userid */
290
467
uid = (uid_t)strtol(arg, NULL, 10);
291
468
break;
292
case 130:
469
case 131: /* --groupid */
293
470
gid = (gid_t)strtol(arg, NULL, 10);
294
471
break;
295
case 131:
472
case 132: /* --debug */
296
473
debug = true;
297
474
break;
298
475
case ARGP_KEY_ARG:
299
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
300
argp_usage (state);
476
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
477
break;
478
case ARGP_KEY_END:
479
break;
480
default:
481
return ARGP_ERR_UNKNOWN;
482
}
483
return 0;
484
}
485
486
/* This option parser is the same as parse_opt() above, except it
487
ignores everything but the --config-file option. */
488
error_t parse_opt_config_file (int key, char *arg,
489
__attribute__((unused))
490
struct argp_state *state) {
491
switch (key) {
492
case 'g': /* --global-options */
493
case 'G': /* --global-env */
494
case 'o': /* --options-for */
495
case 'E': /* --env-for */
496
case 'd': /* --disable */
497
case 'e': /* --enable */
498
case 128: /* --plugin-dir */
499
break;
500
case 129: /* --config-file */
501
free(argfile);
502
argfile = strdup(arg);
503
if(argfile == NULL){
504
perror("strdup");
301
505
}
302
plus_options = arg;
303
break;
506
break;
507
case 130: /* --userid */
508
case 131: /* --groupid */
509
case 132: /* --debug */
510
case ARGP_KEY_ARG:
304
511
case ARGP_KEY_END:
305
512
break;
306
513
default:
309
516
return 0;
310
517
}
311
518
312
plugin *plugin_list = NULL;
313
314
struct argp argp = { .options = options, .parser = parse_opt,
315
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
519
struct argp argp = { .options = options,
520
.parser = parse_opt_config_file,
521
.args_doc = "",
316
522
.doc = "Mandos plugin runner -- Run plugins" };
317
523
318
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
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);
319
527
if (ret == ARGP_ERR_UNKNOWN){
320
528
fprintf(stderr, "Unknown error while parsing arguments\n");
321
529
exitstatus = EXIT_FAILURE;
322
goto end;
530
goto fallback;
323
531
}
324
532
325
if(plus_options){
326
/* This is a mangled argument in the form of
327
"+--option+--other-option=parameter+--yet-another-option", etc */
328
/* Make new argc and argv vars, and call argp_parse() again. */
329
plus_options++; /* skip the first '+' character */
330
const char delims[] = "+";
331
char *arg;
332
int new_argc = 1;
333
plus_argv = malloc(sizeof(char*) * 2);
334
if(plus_argv == NULL){
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){
335
553
perror("malloc");
336
554
exitstatus = EXIT_FAILURE;
337
goto end;
338
}
339
plus_argv[0] = argv[0];
340
plus_argv[1] = NULL;
341
342
while((arg = strsep(&plus_options, delims)) != NULL){
343
new_argc++;
344
plus_argv = realloc(plus_argv, sizeof(char *)
345
* ((unsigned int) new_argc + 1));
346
if(plus_argv == NULL){
347
perror("realloc");
348
exitstatus = EXIT_FAILURE;
349
goto end;
350
}
351
plus_argv[new_argc-1] = arg;
352
plus_argv[new_argc] = NULL;
353
}
354
355
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
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);
356
610
if (ret == ARGP_ERR_UNKNOWN){
357
611
fprintf(stderr, "Unknown error while parsing arguments\n");
358
612
exitstatus = EXIT_FAILURE;
359
goto end;
613
goto fallback;
360
614
}
361
615
}
362
616
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
363
626
if(debug){
364
627
for(plugin *p = plugin_list; p != NULL; p=p->next){
365
628
fprintf(stderr, "Plugin: %s has %d arguments\n",
367
630
for(char **a = p->argv; *a != NULL; a++){
368
631
fprintf(stderr, "\tArg: %s\n", *a);
369
632
}
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
}
370
637
}
371
638
}
372
639
640
/* Strip permissions down to nobody */
373
641
ret = setuid(uid);
374
642
if (ret == -1){
375
643
perror("setuid");
376
}
377
644
}
378
645
setgid(gid);
379
646
if (ret == -1){
380
647
perror("setgid");
381
648
}
382
649
383
dir = opendir(plugindir);
650
if (plugindir == NULL){
651
dir = opendir(PDIR);
652
} else {
653
dir = opendir(plugindir);
654
}
655
384
656
if(dir == NULL){
385
657
perror("Could not open plugin dir");
386
658
exitstatus = EXIT_FAILURE;
387
goto end;
659
goto fallback;
388
660
}
389
661
390
662
/* Set the FD_CLOEXEC flag on the directory, if possible */
395
667
if(ret < 0){
396
668
perror("set_cloexec_flag");
397
669
exitstatus = EXIT_FAILURE;
398
goto end;
670
goto fallback;
399
671
}
400
672
}
401
673
}
402
674
403
675
FD_ZERO(&rfds_all);
404
676
677
/* Read and execute any executable in the plugin directory*/
405
678
while(true){
406
679
dirst = readdir(dir);
407
680
408
// All directory entries have been processed
681
/* All directory entries have been processed */
409
682
if(dirst == NULL){
410
683
if (errno == EBADF){
411
684
perror("readdir");
412
685
exitstatus = EXIT_FAILURE;
413
goto end;
686
goto fallback;
414
687
}
415
688
break;
416
689
}
417
690
418
691
d_name_len = strlen(dirst->d_name);
419
692
420
// Ignore dotfiles, backup files and other junk
693
/* Ignore dotfiles, backup files and other junk */
421
694
{
422
695
bool bad_name = false;
423
696
438
711
break;
439
712
}
440
713
}
441
442
714
if(bad_name){
443
715
continue;
444
716
}
445
446
717
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
447
718
size_t suf_len = strlen(*suf);
448
719
if((d_name_len >= suf_len)
461
732
continue;
462
733
}
463
734
}
464
465
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
466
if (filename == NULL){
467
perror("malloc");
735
736
char *filename;
737
if(plugindir == NULL){
738
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
739
} else {
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
}
742
if(ret < 0){
743
perror("asprintf");
468
744
continue;
469
745
}
470
strcpy(filename, plugindir); /* Spurious warning */
471
strcat(filename, "/"); /* Spurious warning */
472
strcat(filename, dirst->d_name); /* Spurious warning */
473
746
474
747
ret = stat(filename, &st);
475
748
if (ret == -1){
477
750
free(filename);
478
751
continue;
479
752
}
480
753
754
/* Ignore non-executable files */
481
755
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
482
756
if(debug){
483
757
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
486
760
free(filename);
487
761
continue;
488
762
}
489
if(getplugin(dirst->d_name, &plugin_list)->disabled){
763
764
plugin *p = getplugin(dirst->d_name);
765
if(p == NULL){
766
perror("getplugin");
767
free(filename);
768
continue;
769
}
770
if(p->disabled){
490
771
if(debug){
491
772
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
492
773
dirst->d_name);
494
775
free(filename);
495
776
continue;
496
777
}
497
plugin *p = getplugin(dirst->d_name, &plugin_list);
498
778
{
499
779
/* Add global arguments to argument list for this plugin */
500
plugin *g = getplugin(NULL, &plugin_list);
501
for(char **a = g->argv + 1; *a != NULL; a++){
502
addargument(p, *a);
503
}
504
}
505
int pipefd[2];
780
plugin *g = getplugin(NULL);
781
if(g != NULL){
782
for(char **a = g->argv + 1; *a != NULL; a++){
783
if(not add_argument(p, *a)){
784
perror("add_argument");
785
}
786
}
787
/* Add global environment variables */
788
for(char **e = g->environ; *e != NULL; e++){
789
if(not add_environment(p, *e, false)){
790
perror("add_environment");
791
}
792
}
793
}
794
}
795
/* If this plugin has any environment variables, we will call
796
using execve and need to duplicate the environment from this
797
process, too. */
798
if(p->environ[0] != NULL){
799
for(char **e = environ; *e != NULL; e++){
800
if(not add_environment(p, *e, false)){
801
perror("add_environment");
802
}
803
}
804
}
805
806
int pipefd[2];
506
807
ret = pipe(pipefd);
507
808
if (ret == -1){
508
809
perror("pipe");
509
810
exitstatus = EXIT_FAILURE;
510
goto end;
811
goto fallback;
511
812
}
813
/* Ask OS to automatic close the pipe on exec */
512
814
ret = set_cloexec_flag(pipefd[0]);
513
815
if(ret < 0){
514
816
perror("set_cloexec_flag");
515
817
exitstatus = EXIT_FAILURE;
516
goto end;
818
goto fallback;
517
819
}
518
820
ret = set_cloexec_flag(pipefd[1]);
519
821
if(ret < 0){
520
822
perror("set_cloexec_flag");
521
823
exitstatus = EXIT_FAILURE;
522
goto end;
824
goto fallback;
523
825
}
524
826
/* Block SIGCHLD until process is safely in process list */
525
827
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
526
828
if(ret < 0){
527
829
perror("sigprocmask");
528
830
exitstatus = EXIT_FAILURE;
529
goto end;
831
goto fallback;
530
832
}
531
// Starting a new process to be watched
833
/* Starting a new process to be watched */
532
834
pid_t pid = fork();
533
835
if(pid == -1){
534
836
perror("fork");
535
837
exitstatus = EXIT_FAILURE;
536
goto end;
838
goto fallback;
537
839
}
538
840
if(pid == 0){
539
841
/* this is the child process */
559
861
above and must now close it manually here. */
560
862
closedir(dir);
561
863
}
562
if(execv(filename, p->argv) < 0){
563
perror("execv");
564
_exit(EXIT_FAILURE);
864
if(p->environ[0] == NULL){
865
if(execv(filename, p->argv) < 0){
866
perror("execv");
867
_exit(EXIT_FAILURE);
868
}
869
} else {
870
if(execve(filename, p->argv, p->environ) < 0){
871
perror("execve");
872
_exit(EXIT_FAILURE);
873
}
565
874
}
566
875
/* no return */
567
876
}
568
/* parent process */
877
/* Parent process */
878
close(pipefd[1]); /* Close unused write end of pipe */
569
879
free(filename);
570
close(pipefd[1]); /* close unused write end of pipe */
571
process *new_process = malloc(sizeof(process));
572
if (new_process == NULL){
573
perror("malloc");
880
plugin *new_plugin = getplugin(dirst->d_name);
881
if (new_plugin == NULL){
882
perror("getplugin");
574
883
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
575
884
if(ret < 0){
576
perror("sigprocmask");
885
perror("sigprocmask");
577
886
}
578
887
exitstatus = EXIT_FAILURE;
579
goto end;
888
goto fallback;
580
889
}
581
890
582
*new_process = (struct process){ .pid = pid,
583
.fd = pipefd[0],
584
.next = process_list };
585
// List handling
586
process_list = new_process;
891
new_plugin->pid = pid;
892
new_plugin->fd = pipefd[0];
893
587
894
/* Unblock SIGCHLD so signal handler can be run if this process
588
895
has already completed */
589
896
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
590
897
if(ret < 0){
591
898
perror("sigprocmask");
592
899
exitstatus = EXIT_FAILURE;
593
goto end;
594
}
595
596
FD_SET(new_process->fd, &rfds_all);
597
598
if (maxfd < new_process->fd){
599
maxfd = new_process->fd;
600
}
601
602
}
603
604
/* Free the plugin list */
605
for(plugin *next; plugin_list != NULL; plugin_list = next){
606
next = plugin_list->next;
607
free(plugin_list->argv);
608
free(plugin_list);
900
goto fallback;
901
}
902
903
FD_SET(new_plugin->fd, &rfds_all);
904
905
if (maxfd < new_plugin->fd){
906
maxfd = new_plugin->fd;
907
}
908
609
909
}
610
910
611
911
closedir(dir);
612
912
dir = NULL;
613
614
if (process_list == NULL){
615
fprintf(stderr, "No plugin processes started. Incorrect plugin"
616
" directory?\n");
617
process_list = NULL;
913
914
for(plugin *p = plugin_list; p != NULL; p = p->next){
915
if(p->pid != 0){
916
break;
917
}
918
if(p->next == NULL){
919
fprintf(stderr, "No plugin processes started. Incorrect plugin"
920
" directory?\n");
921
free_plugin_list();
922
}
618
923
}
619
while(process_list){
924
925
/* Main loop while running plugins exist */
926
while(plugin_list){
620
927
fd_set rfds = rfds_all;
621
928
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
622
929
if (select_ret == -1){
623
930
perror("select");
624
931
exitstatus = EXIT_FAILURE;
625
goto end;
932
goto fallback;
626
933
}
627
934
/* OK, now either a process completed, or something can be read
628
935
from one of them */
629
for(process *proc = process_list; proc ; proc = proc->next){
936
for(plugin *proc = plugin_list; proc != NULL;){
630
937
/* Is this process completely done? */
631
938
if(proc->eof and proc->completed){
632
939
/* Only accept the plugin output if it exited cleanly */
633
940
if(not WIFEXITED(proc->status)
634
941
or WEXITSTATUS(proc->status) != 0){
635
942
/* Bad exit by plugin */
943
636
944
if(debug){
637
945
if(WIFEXITED(proc->status)){
638
946
fprintf(stderr, "Plugin %u exited with status %d\n",
647
955
(unsigned int) (proc->pid));
648
956
}
649
957
}
958
650
959
/* Remove the plugin */
651
960
FD_CLR(proc->fd, &rfds_all);
961
652
962
/* Block signal while modifying process_list */
653
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
654
964
if(ret < 0){
655
965
perror("sigprocmask");
656
966
exitstatus = EXIT_FAILURE;
657
goto end;
658
}
659
/* Delete this process entry from the list */
660
if(process_list == proc){
661
/* First one - simple */
662
process_list = proc->next;
663
} else {
664
/* Second one or later */
665
for(process *p = process_list; p != NULL; p = p->next){
666
if(p->next == proc){
667
p->next = proc->next;
668
break;
669
}
670
}
671
}
967
goto fallback;
968
}
969
672
970
/* We are done modifying process list, so unblock signal */
673
971
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
674
972
NULL);
675
973
if(ret < 0){
676
974
perror("sigprocmask");
677
}
678
free(proc->buffer);
679
free(proc);
680
/* We deleted this process from the list, so we can't go
681
proc->next. Therefore, start over from the beginning of
682
the process list */
683
break;
975
exitstatus = EXIT_FAILURE;
976
goto fallback;
977
}
978
979
if(plugin_list == NULL){
980
break;
981
}
982
983
plugin *next_plugin = proc->next;
984
free_plugin(proc);
985
proc = next_plugin;
986
continue;
684
987
}
988
685
989
/* This process exited nicely, so print its buffer */
686
990
687
bool bret = print_out_password(proc->buffer, proc->buffer_length);
991
bool bret = print_out_password(proc->buffer,
992
proc->buffer_length);
688
993
if(not bret){
689
994
perror("print_out_password");
690
995
exitstatus = EXIT_FAILURE;
691
996
}
692
goto end;
997
goto fallback;
693
998
}
999
694
1000
/* This process has not completed. Does it have any output? */
695
1001
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
696
1002
/* This process had nothing to say at this time */
1003
proc = proc->next;
697
1004
continue;
698
1005
}
699
1006
/* Before reading, make the process' data buffer large enough */
703
1010
if (proc->buffer == NULL){
704
1011
perror("malloc");
705
1012
exitstatus = EXIT_FAILURE;
706
goto end;
1013
goto fallback;
707
1014
}
708
1015
proc->buffer_size += BUFFER_SIZE;
709
1016
}
712
1019
BUFFER_SIZE);
713
1020
if(ret < 0){
714
1021
/* Read error from this process; ignore the error */
1022
proc = proc->next;
715
1023
continue;
716
1024
}
717
1025
if(ret == 0){
724
1032
}
725
1033
726
1034
727
end:
1035
fallback:
728
1036
729
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
730
/* Fallback if all plugins failed, none are found or an error occured */
1037
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1038
/* Fallback if all plugins failed, none are found or an error
1039
occured */
731
1040
bool bret;
732
1041
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
733
1042
char *passwordbuffer = getpass("Password: ");
734
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1043
size_t len = strlen(passwordbuffer);
1044
/* Strip trailing newline */
1045
if(len > 0 and passwordbuffer[len-1] == '\n'){
1046
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1047
len--;
1048
}
1049
bret = print_out_password(passwordbuffer, len);
735
1050
if(not bret){
736
1051
perror("print_out_password");
737
1052
exitstatus = EXIT_FAILURE;
738
goto end;
739
1053
}
740
1054
}
741
1055
742
1056
/* Restore old signal handler */
743
sigaction(SIGCHLD, &old_sigchld_action, NULL);
744
745
free(plus_argv);
746
747
/* Free the plugin list */
748
for(plugin *next; plugin_list != NULL; plugin_list = next){
749
next = plugin_list->next;
750
free(plugin_list->argv);
751
free(plugin_list);
1057
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1058
if(ret == -1){
1059
perror("sigaction");
1060
exitstatus = EXIT_FAILURE;
1061
}
1062
1063
if(custom_argv != NULL){
1064
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1065
free(*arg);
1066
}
1067
free(custom_argv);
752
1068
}
753
1069
754
1070
if(dir != NULL){
756
1072
}
757
1073
758
1074
/* Free the process list and kill the processes */
759
for(process *next; process_list != NULL; process_list = next){
760
next = process_list->next;
761
close(process_list->fd);
762
ret = kill(process_list->pid, SIGTERM);
763
if(ret == -1 and errno != ESRCH){
764
/* set-uid proccesses migth not get closed */
765
perror("kill");
1075
for(plugin *p = plugin_list; p != NULL; p = p->next){
1076
if(p->pid != 0){
1077
close(p->fd);
1078
ret = kill(p->pid, SIGTERM);
1079
if(ret == -1 and errno != ESRCH){
1080
/* Set-uid proccesses might not get closed */
1081
perror("kill");
1082
}
766
1083
}
767
free(process_list->buffer);
768
free(process_list);
769
1084
}
770
1085
771
1086
/* Wait for any remaining child processes to terminate */
775
1090
if(errno != ECHILD){
776
1091
perror("wait");
777
1092
}
1093
1094
free_plugin_list();
1095
1096
free(plugindir);
1097
free(argfile);
778
1098
779
1099
return exitstatus;
780
1100
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0