To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to mandos-client.c
- browse files at revision 63
- compare with another revision
- download diff
- download tarball
- view history from revision 63
- Committer: Teddy Hogeborn
- Date: 2008-08-10 20:35:01 UTC
- mfrom: (24.1.42 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080810203501-euh3qcf1nopilksm
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
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;
187
132
}
188
133
189
134
/*
202
147
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
203
148
}
204
149
150
process *process_list = NULL;
205
151
206
/* Mark processes as completed when they exit, and save their exit
152
/* Mark a process as completed when it exits, and save its exit
207
153
status. */
208
154
void handle_sigchld(__attribute__((unused)) int sig){
209
while(true){
210
plugin *proc = plugin_list;
211
int status;
212
pid_t pid = waitpid(-1, &status, WNOHANG);
213
if(pid == 0){
214
/* Only still running child processes */
215
break;
216
}
217
if(pid == -1){
218
if (errno != ECHILD){
219
perror("waitpid");
220
}
221
/* No child processes */
222
break;
223
}
224
225
/* A child exited, find it in process_list */
226
while(proc != NULL and proc->pid != pid){
227
proc = proc->next;
228
}
229
if(proc == NULL){
230
/* Process not found in process list */
231
continue;
232
}
233
proc->status = status;
234
proc->completed = true;
235
}
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;
236
171
}
237
172
238
/* Prints out a password to stdout */
239
173
bool print_out_password(const char *buffer, size_t length){
240
ssize_t ret;
241
if(length>0 and buffer[length-1] == '\n'){
242
length--;
243
}
244
for(size_t written = 0; written < length; written += (size_t)ret){
174
size_t ret;
175
for(size_t written = 0; written < length; written += ret){
245
176
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
177
length - written));
247
178
if(ret < 0){
251
182
return true;
252
183
}
253
184
254
/* Removes and free a plugin from the plugin list */
255
static void free_plugin(plugin *plugin_node){
256
257
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
258
free(*arg);
259
}
260
free(plugin_node->argv);
261
for(char **env = plugin_node->environ; *env != NULL; env++){
262
free(*env);
263
}
264
free(plugin_node->environ);
265
free(plugin_node->buffer);
266
267
/* Removes the plugin from the singly-linked list */
268
if(plugin_node == plugin_list){
269
/* First one - simple */
270
plugin_list = plugin_list->next;
271
} else {
272
/* Second one or later */
273
for(plugin *p = plugin_list; p != NULL; p = p->next){
274
if(p->next == plugin_node){
275
p->next = plugin_node->next;
276
break;
277
}
278
}
279
}
280
281
free(plugin_node);
282
}
283
284
static void free_plugin_list(void){
285
while(plugin_list != NULL){
286
free_plugin(plugin_list);
287
}
288
}
289
290
185
int main(int argc, char *argv[]){
291
char *plugindir = NULL;
292
char *argfile = NULL;
293
FILE *conffp;
186
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
294
187
size_t d_name_len;
295
188
DIR *dir = NULL;
296
189
struct dirent *dirst;
304
197
struct sigaction old_sigchld_action;
305
198
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
306
199
.sa_flags = SA_NOCLDSTOP };
307
char **custom_argv = NULL;
308
int custom_argc = 0;
200
char *plus_options = NULL;
201
char **plus_argv = NULL;
309
202
310
203
/* Establish a signal handler */
311
204
sigemptyset(&sigchld_action.sa_mask);
312
205
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
313
if(ret == -1){
206
if(ret < 0){
314
207
perror("sigaddset");
315
exitstatus = EXIT_FAILURE;
316
goto fallback;
208
exit(EXIT_FAILURE);
317
209
}
318
210
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
319
if(ret == -1){
211
if(ret < 0){
320
212
perror("sigaction");
321
exitstatus = EXIT_FAILURE;
322
goto fallback;
213
exit(EXIT_FAILURE);
323
214
}
324
215
325
216
/* The options we understand. */
327
218
{ .name = "global-options", .key = 'g',
328
219
.arg = "OPTION[,OPTION[,...]]",
329
220
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
331
.arg = "VAR=value",
332
.doc = "Environment variable passed to all plugins" },
333
221
{ .name = "options-for", .key = 'o',
334
222
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
223
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
337
.arg = "PLUGIN:ENV=value",
338
.doc = "Environment variable passed to specified plugin" },
339
224
{ .name = "disable", .key = 'd',
340
225
.arg = "PLUGIN",
341
226
.doc = "Disable a specific plugin", .group = 1 },
342
227
{ .name = "plugin-dir", .key = 128,
343
228
.arg = "DIRECTORY",
344
229
.doc = "Specify a different plugin directory", .group = 2 },
345
{ .name = "config-file", .key = 129,
346
.arg = "FILE",
347
.doc = "Specify a different configuration file", .group = 2 },
348
{ .name = "userid", .key = 130,
349
.arg = "ID", .flags = 0,
350
.doc = "User ID the plugins will run as", .group = 3 },
351
{ .name = "groupid", .key = 131,
352
.arg = "ID", .flags = 0,
353
.doc = "Group ID the plugins will run as", .group = 3 },
354
{ .name = "debug", .key = 132,
355
.doc = "Debug mode", .group = 4 },
230
{ .name = "userid", .key = 129,
231
.arg = "ID", .flags = 0,
232
.doc = "User ID the plugins will run as", .group = 2 },
233
{ .name = "groupid", .key = 130,
234
.arg = "ID", .flags = 0,
235
.doc = "Group ID the plugins will run as", .group = 2 },
236
{ .name = "debug", .key = 131,
237
.doc = "Debug mode", .group = 3 },
356
238
{ .name = NULL }
357
239
};
358
240
359
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
struct argp_state *state) {
241
error_t parse_opt (int key, char *arg, struct argp_state *state) {
361
242
/* Get the INPUT argument from `argp_parse', which we know is a
362
243
pointer to our plugin list pointer. */
244
plugin **plugins = state->input;
363
245
switch (key) {
364
case 'g': /* --global-options */
365
if (arg != NULL){
366
char *p;
367
while((p = strsep(&arg, ",")) != NULL){
368
if(p[0] == '\0'){
369
continue;
370
}
371
if(not add_argument(getplugin(NULL), p)){
372
perror("add_argument");
373
return ARGP_ERR_UNKNOWN;
374
}
375
}
376
}
377
break;
378
case 'e': /* --global-envs */
379
if(arg == NULL){
380
break;
381
}
382
{
383
char *envdef = strdup(arg);
384
if(envdef == NULL){
385
break;
386
}
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
389
}
390
}
391
break;
392
case 'o': /* --options-for */
393
if (arg != NULL){
394
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
396
break;
397
}
398
char *opt = strsep(&arg, ":");
399
if(opt[0] == '\0'){
400
break;
401
}
402
if(opt != NULL){
403
char *p;
404
while((p = strsep(&opt, ",")) != NULL){
405
if(p[0] == '\0'){
406
continue;
407
}
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
}
412
}
413
}
414
}
415
break;
416
case 'f': /* --envs-for */
417
if(arg == NULL){
418
break;
419
}
420
{
421
char *envdef = strchr(arg, ':');
422
if(envdef == NULL){
423
break;
424
}
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
426
if(p_name == NULL){
427
break;
428
}
429
envdef++;
430
if(not add_environment(getplugin(p_name), envdef)){
431
perror("add_environment");
432
}
433
}
434
break;
435
case 'd': /* --disable */
436
if (arg != NULL){
437
plugin *p = getplugin(arg);
438
if(p == NULL){
439
return ARGP_ERR_UNKNOWN;
440
}
441
p->disabled = true;
442
}
443
break;
444
case 128: /* --plugin-dir */
445
plugindir = strdup(arg);
446
if(plugindir == NULL){
447
perror("strdup");
448
}
449
break;
450
case 129: /* --config-file */
451
argfile = strdup(arg);
452
if(argfile == NULL){
453
perror("strdup");
454
}
455
break;
456
case 130: /* --userid */
246
case 'g':
247
if (arg != NULL){
248
char *p = strtok(arg, ",");
249
do{
250
addargument(getplugin(NULL, plugins), p);
251
p = strtok(NULL, ",");
252
} while (p != NULL);
253
}
254
break;
255
case 'o':
256
if (arg != NULL){
257
char *name = strtok(arg, ":");
258
char *p = strtok(NULL, ":");
259
if(p != NULL){
260
p = strtok(p, ",");
261
do{
262
addargument(getplugin(name, plugins), p);
263
p = strtok(NULL, ",");
264
} while (p != NULL);
265
}
266
}
267
break;
268
case 'd':
269
if (arg != NULL){
270
getplugin(arg, plugins)->disabled = true;
271
}
272
break;
273
case 128:
274
plugindir = arg;
275
break;
276
case 129:
457
277
uid = (uid_t)strtol(arg, NULL, 10);
458
278
break;
459
case 131: /* --groupid */
279
case 130:
460
280
gid = (gid_t)strtol(arg, NULL, 10);
461
281
break;
462
case 132: /* --debug */
282
case 131:
463
283
debug = true;
464
284
break;
465
285
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
286
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
287
argp_usage (state);
288
}
289
plus_options = arg;
467
290
break;
468
291
case ARGP_KEY_END:
469
292
break;
473
296
return 0;
474
297
}
475
298
299
plugin *plugin_list = NULL;
300
476
301
struct argp argp = { .options = options, .parser = parse_opt,
477
302
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
478
303
.doc = "Mandos plugin runner -- Run plugins" };
479
304
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
305
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
481
306
if (ret == ARGP_ERR_UNKNOWN){
482
fprintf(stderr, "Unknown error while parsing arguments\n");
307
fprintf(stderr, "Unkown error while parsing arguments\n");
483
308
exitstatus = EXIT_FAILURE;
484
goto fallback;
309
goto end;
485
310
}
486
487
/* Opens the configfile if aviable */
488
if (argfile == NULL){
489
conffp = fopen(AFILE, "r");
490
} else {
491
conffp = fopen(argfile, "r");
492
}
493
if(conffp != NULL){
494
char *org_line = NULL;
495
char *p, *arg, *new_arg, *line;
496
size_t size = 0;
497
ssize_t sret;
498
const char whitespace_delims[] = " \r\t\f\v\n";
499
const char comment_delim[] = "#";
500
501
custom_argc = 1;
502
custom_argv = malloc(sizeof(char*) * 2);
503
if(custom_argv == NULL){
311
312
if(plus_options){
313
/* This is a mangled argument in the form of
314
"+--option+--other-option=parameter+--yet-another-option", etc */
315
/* Make new argc and argv vars, and call argp_parse() again. */
316
plus_options++; /* skip the first '+' character */
317
const char delims[] = "+";
318
char *arg;
319
int new_argc = 1;
320
plus_argv = malloc(sizeof(char*) * 2);
321
if(plus_argv == NULL){
504
322
perror("malloc");
505
323
exitstatus = EXIT_FAILURE;
506
goto fallback;
507
}
508
custom_argv[0] = argv[0];
509
custom_argv[1] = NULL;
510
511
/* for each line in the config file, strip whitespace and ignore
512
commented text */
513
while(true){
514
sret = getline(&org_line, &size, conffp);
515
if(sret == -1){
516
break;
517
}
518
519
line = org_line;
520
arg = strsep(&line, comment_delim);
521
while((p = strsep(&arg, whitespace_delims)) != NULL){
522
if(p[0] == '\0'){
523
continue;
524
}
525
new_arg = strdup(p);
526
if(new_arg == NULL){
527
perror("strdup");
528
exitstatus = EXIT_FAILURE;
529
free(org_line);
530
goto fallback;
531
}
532
533
custom_argc += 1;
534
custom_argv = realloc(custom_argv, sizeof(char *)
535
* ((unsigned int) custom_argc + 1));
536
if(custom_argv == NULL){
537
perror("realloc");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
custom_argv[custom_argc-1] = new_arg;
543
custom_argv[custom_argc] = NULL;
544
}
545
}
546
free(org_line);
547
} else{
548
/* Check for harmful errors and go to fallback. Other errors might
549
not affect opening plugins */
550
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
551
perror("fopen");
552
exitstatus = EXIT_FAILURE;
553
goto fallback;
554
}
555
}
556
/* If there was any arguments from configuration file,
557
pass them to parser as command arguments */
558
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
324
goto end;
325
}
326
plus_argv[0] = argv[0];
327
plus_argv[1] = NULL;
328
arg = strtok(plus_options, delims); /* Get first argument */
329
while(arg != NULL){
330
new_argc++;
331
plus_argv = realloc(plus_argv, sizeof(char *)
332
* ((unsigned int) new_argc + 1));
333
if(plus_argv == NULL){
334
perror("realloc");
335
exitstatus = EXIT_FAILURE;
336
goto end;
337
}
338
plus_argv[new_argc-1] = arg;
339
plus_argv[new_argc] = NULL;
340
arg = strtok(NULL, delims); /* Get next argument */
341
}
342
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
560
343
if (ret == ARGP_ERR_UNKNOWN){
561
fprintf(stderr, "Unknown error while parsing arguments\n");
344
fprintf(stderr, "Unkown error while parsing arguments\n");
562
345
exitstatus = EXIT_FAILURE;
563
goto fallback;
346
goto end;
564
347
}
565
348
}
566
349
571
354
for(char **a = p->argv; *a != NULL; a++){
572
355
fprintf(stderr, "\tArg: %s\n", *a);
573
356
}
574
fprintf(stderr, "...and %u environment variables\n", p->envc);
575
for(char **a = p->environ; *a != NULL; a++){
576
fprintf(stderr, "\t%s\n", *a);
577
}
578
357
}
579
358
}
580
581
/* Strip permissions down to nobody */
359
582
360
ret = setuid(uid);
583
361
if (ret == -1){
584
362
perror("setuid");
585
}
363
}
364
586
365
setgid(gid);
587
366
if (ret == -1){
588
367
perror("setgid");
589
368
}
590
591
if (plugindir == NULL){
592
dir = opendir(PDIR);
593
} else {
594
dir = opendir(plugindir);
595
}
596
369
370
dir = opendir(plugindir);
597
371
if(dir == NULL){
598
372
perror("Could not open plugin dir");
599
373
exitstatus = EXIT_FAILURE;
600
goto fallback;
374
goto end;
601
375
}
602
376
603
377
/* Set the FD_CLOEXEC flag on the directory, if possible */
608
382
if(ret < 0){
609
383
perror("set_cloexec_flag");
610
384
exitstatus = EXIT_FAILURE;
611
goto fallback;
385
goto end;
612
386
}
613
387
}
614
388
}
615
389
616
390
FD_ZERO(&rfds_all);
617
618
/* Read and execute any executable in the plugin directory*/
391
619
392
while(true){
620
393
dirst = readdir(dir);
621
394
624
397
if (errno == EBADF){
625
398
perror("readdir");
626
399
exitstatus = EXIT_FAILURE;
627
goto fallback;
400
goto end;
628
401
}
629
402
break;
630
403
}
652
425
break;
653
426
}
654
427
}
428
655
429
if(bad_name){
656
430
continue;
657
431
}
432
658
433
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
659
434
size_t suf_len = strlen(*suf);
660
435
if((d_name_len >= suf_len)
673
448
continue;
674
449
}
675
450
}
676
677
char *filename;
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
679
if(ret < 0){
680
perror("asprintf");
681
continue;
451
452
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
453
if (filename == NULL){
454
perror("malloc");
455
exitstatus = EXIT_FAILURE;
456
goto end;
682
457
}
458
strcpy(filename, plugindir); /* Spurious warning */
459
strcat(filename, "/"); /* Spurious warning */
460
strcat(filename, dirst->d_name); /* Spurious warning */
683
461
684
462
ret = stat(filename, &st);
685
463
if (ret == -1){
686
464
perror("stat");
687
free(filename);
688
continue;
465
exitstatus = EXIT_FAILURE;
466
goto end;
689
467
}
690
691
/* Ignore non-executable files */
468
692
469
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
693
470
if(debug){
694
471
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
697
474
free(filename);
698
475
continue;
699
476
}
700
701
plugin *p = getplugin(dirst->d_name);
702
if(p == NULL){
703
perror("getplugin");
704
free(filename);
705
continue;
706
}
707
if(p->disabled){
477
if(getplugin(dirst->d_name, &plugin_list)->disabled){
708
478
if(debug){
709
479
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
710
480
dirst->d_name);
712
482
free(filename);
713
483
continue;
714
484
}
485
plugin *p = getplugin(dirst->d_name, &plugin_list);
715
486
{
716
487
/* Add global arguments to argument list for this plugin */
717
plugin *g = getplugin(NULL);
718
if(g != NULL){
719
for(char **a = g->argv + 1; *a != NULL; a++){
720
if(not add_argument(p, *a)){
721
perror("add_argument");
722
}
723
}
724
/* Add global environment variables */
725
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
727
perror("add_environment");
728
}
729
}
730
}
731
}
732
/* If this plugin has any environment variables, we will call
733
using execve and need to duplicate the environment from this
734
process, too. */
735
if(p->environ[0] != NULL){
736
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
738
if(copy == NULL){
739
perror("strdup");
740
continue;
741
}
742
if(not add_environment(p, copy)){
743
perror("add_environment");
744
}
745
}
746
}
747
748
int pipefd[2];
488
plugin *g = getplugin(NULL, &plugin_list);
489
for(char **a = g->argv + 1; *a != NULL; a++){
490
addargument(p, *a);
491
}
492
}
493
int pipefd[2];
749
494
ret = pipe(pipefd);
750
495
if (ret == -1){
751
496
perror("pipe");
752
497
exitstatus = EXIT_FAILURE;
753
goto fallback;
498
goto end;
754
499
}
755
/* Ask OS to automatic close the pipe on exec */
756
500
ret = set_cloexec_flag(pipefd[0]);
757
501
if(ret < 0){
758
502
perror("set_cloexec_flag");
759
503
exitstatus = EXIT_FAILURE;
760
goto fallback;
504
goto end;
761
505
}
762
506
ret = set_cloexec_flag(pipefd[1]);
763
507
if(ret < 0){
764
508
perror("set_cloexec_flag");
765
509
exitstatus = EXIT_FAILURE;
766
goto fallback;
510
goto end;
767
511
}
768
512
/* Block SIGCHLD until process is safely in process list */
769
513
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
770
514
if(ret < 0){
771
515
perror("sigprocmask");
772
516
exitstatus = EXIT_FAILURE;
773
goto fallback;
517
goto end;
774
518
}
775
519
// Starting a new process to be watched
776
520
pid_t pid = fork();
777
if(pid == -1){
778
perror("fork");
779
exitstatus = EXIT_FAILURE;
780
goto fallback;
781
}
782
521
if(pid == 0){
783
522
/* this is the child process */
784
523
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
803
542
above and must now close it manually here. */
804
543
closedir(dir);
805
544
}
806
if(p->environ[0] == NULL){
807
if(execv(filename, p->argv) < 0){
808
perror("execv");
809
_exit(EXIT_FAILURE);
810
}
811
} else {
812
if(execve(filename, p->argv, p->environ) < 0){
813
perror("execve");
814
_exit(EXIT_FAILURE);
815
}
545
if(execv(filename, p->argv) < 0){
546
perror("execv");
547
_exit(EXIT_FAILURE);
816
548
}
817
549
/* no return */
818
550
}
819
/* Parent process */
820
close(pipefd[1]); /* Close unused write end of pipe */
551
/* parent process */
821
552
free(filename);
822
plugin *new_plugin = getplugin(dirst->d_name);
823
if (new_plugin == NULL){
824
perror("getplugin");
553
close(pipefd[1]); /* close unused write end of pipe */
554
process *new_process = malloc(sizeof(process));
555
if (new_process == NULL){
556
perror("malloc");
825
557
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
826
558
if(ret < 0){
827
perror("sigprocmask");
559
perror("sigprocmask");
828
560
}
829
561
exitstatus = EXIT_FAILURE;
830
goto fallback;
562
goto end;
831
563
}
832
564
833
new_plugin->pid = pid;
834
new_plugin->fd = pipefd[0];
835
565
*new_process = (struct process){ .pid = pid,
566
.fd = pipefd[0],
567
.next = process_list };
568
// List handling
569
process_list = new_process;
836
570
/* Unblock SIGCHLD so signal handler can be run if this process
837
571
has already completed */
838
572
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
839
573
if(ret < 0){
840
574
perror("sigprocmask");
841
575
exitstatus = EXIT_FAILURE;
842
goto fallback;
843
}
844
845
FD_SET(new_plugin->fd, &rfds_all);
846
847
if (maxfd < new_plugin->fd){
848
maxfd = new_plugin->fd;
849
}
850
576
goto end;
577
}
578
579
FD_SET(new_process->fd, &rfds_all);
580
581
if (maxfd < new_process->fd){
582
maxfd = new_process->fd;
583
}
584
585
}
586
587
/* Free the plugin list */
588
for(plugin *next; plugin_list != NULL; plugin_list = next){
589
next = plugin_list->next;
590
free(plugin_list->argv);
591
free(plugin_list);
851
592
}
852
593
853
594
closedir(dir);
854
595
dir = NULL;
855
856
for(plugin *p = plugin_list; p != NULL; p = p->next){
857
if(p->pid != 0){
858
break;
859
}
860
if(p->next == NULL){
861
fprintf(stderr, "No plugin processes started. Incorrect plugin"
862
" directory?\n");
863
free_plugin_list();
864
}
596
597
if (process_list == NULL){
598
fprintf(stderr, "No plugin processes started. Incorrect plugin"
599
" directory?\n");
600
process_list = NULL;
865
601
}
866
867
/* Main loop while running plugins exist */
868
while(plugin_list){
602
while(process_list){
869
603
fd_set rfds = rfds_all;
870
604
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
871
605
if (select_ret == -1){
872
606
perror("select");
873
607
exitstatus = EXIT_FAILURE;
874
goto fallback;
608
goto end;
875
609
}
876
610
/* OK, now either a process completed, or something can be read
877
611
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
612
for(process *proc = process_list; proc ; proc = proc->next){
879
613
/* Is this process completely done? */
880
614
if(proc->eof and proc->completed){
881
615
/* Only accept the plugin output if it exited cleanly */
882
616
if(not WIFEXITED(proc->status)
883
617
or WEXITSTATUS(proc->status) != 0){
884
618
/* Bad exit by plugin */
885
886
619
if(debug){
887
620
if(WIFEXITED(proc->status)){
888
621
fprintf(stderr, "Plugin %u exited with status %d\n",
897
630
(unsigned int) (proc->pid));
898
631
}
899
632
}
900
901
633
/* Remove the plugin */
902
634
FD_CLR(proc->fd, &rfds_all);
903
904
635
/* Block signal while modifying process_list */
905
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
636
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
906
637
if(ret < 0){
907
638
perror("sigprocmask");
908
639
exitstatus = EXIT_FAILURE;
909
goto fallback;
910
}
911
free_plugin(proc);
640
goto end;
641
}
642
/* Delete this process entry from the list */
643
if(process_list == proc){
644
/* First one - simple */
645
process_list = proc->next;
646
} else {
647
/* Second one or later */
648
for(process *p = process_list; p != NULL; p = p->next){
649
if(p->next == proc){
650
p->next = proc->next;
651
break;
652
}
653
}
654
}
912
655
/* We are done modifying process list, so unblock signal */
913
656
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
914
657
NULL);
915
658
if(ret < 0){
916
659
perror("sigprocmask");
917
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
921
if(plugin_list == NULL){
922
break;
923
}
924
continue;
660
}
661
free(proc->buffer);
662
free(proc);
663
/* We deleted this process from the list, so we can't go
664
proc->next. Therefore, start over from the beginning of
665
the process list */
666
break;
925
667
}
926
927
668
/* This process exited nicely, so print its buffer */
928
669
929
bool bret = print_out_password(proc->buffer,
930
proc->buffer_length);
670
bool bret = print_out_password(proc->buffer, proc->buffer_length);
931
671
if(not bret){
932
672
perror("print_out_password");
933
673
exitstatus = EXIT_FAILURE;
934
674
}
935
goto fallback;
675
goto end;
936
676
}
937
938
677
/* This process has not completed. Does it have any output? */
939
678
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
679
/* This process had nothing to say at this time */
947
686
if (proc->buffer == NULL){
948
687
perror("malloc");
949
688
exitstatus = EXIT_FAILURE;
950
goto fallback;
689
goto end;
951
690
}
952
691
proc->buffer_size += BUFFER_SIZE;
953
692
}
966
705
}
967
706
}
968
707
}
969
970
971
fallback:
972
708
973
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
974
/* Fallback if all plugins failed, none are found or an error
975
occured */
709
if(process_list == NULL){
976
710
bool bret;
977
711
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
712
char *passwordbuffer = getpass("Password: ");
980
714
if(not bret){
981
715
perror("print_out_password");
982
716
exitstatus = EXIT_FAILURE;
717
goto end;
718
}
719
bret = print_out_password("\n", 1);
720
if(not bret){
721
perror("print_out_password");
722
exitstatus = EXIT_FAILURE;
983
723
}
984
724
}
725
726
end:
985
727
986
728
/* Restore old signal handler */
987
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
988
if(ret == -1){
989
perror("sigaction");
990
exitstatus = EXIT_FAILURE;
991
}
992
993
if(custom_argv != NULL){
994
for(char **arg = custom_argv+1; *arg != NULL; arg++){
995
free(*arg);
996
}
997
free(custom_argv);
729
sigaction(SIGCHLD, &old_sigchld_action, NULL);
730
731
free(plus_argv);
732
733
/* Free the plugin list */
734
for(plugin *next; plugin_list != NULL; plugin_list = next){
735
next = plugin_list->next;
736
free(plugin_list->argv);
737
free(plugin_list);
998
738
}
999
739
1000
740
if(dir != NULL){
1002
742
}
1003
743
1004
744
/* Free the process list and kill the processes */
1005
for(plugin *p = plugin_list; p != NULL; p = p->next){
1006
if(p->pid != 0){
1007
close(p->fd);
1008
ret = kill(p->pid, SIGTERM);
1009
if(ret == -1 and errno != ESRCH){
1010
/* Set-uid proccesses might not get closed */
1011
perror("kill");
1012
}
745
for(process *next; process_list != NULL; process_list = next){
746
next = process_list->next;
747
close(process_list->fd);
748
ret = kill(process_list->pid, SIGTERM);
749
if(ret == -1 and errno != ESRCH){
750
/* set-uid proccesses migth not get closed */
751
perror("kill");
1013
752
}
753
free(process_list->buffer);
754
free(process_list);
1014
755
}
1015
756
1016
757
/* Wait for any remaining child processes to terminate */
1020
761
if(errno != ECHILD){
1021
762
perror("wait");
1022
763
}
1023
1024
free_plugin_list();
1025
1026
free(plugindir);
1027
free(argfile);
1028
764
1029
765
return exitstatus;
1030
766
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0