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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:35:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811163532-er1zd4q2j4ykfv11
Fixed fallback on error in mandos-client
fixed a bug in password-request
fixed a bug in password-request
- 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
}
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;
245
171
}
246
172
247
/* Prints out a password to stdout */
248
173
bool print_out_password(const char *buffer, size_t length){
249
174
ssize_t ret;
250
175
if(length>0 and buffer[length-1] == '\n'){
260
185
return true;
261
186
}
262
187
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
}
297
}
298
299
188
int main(int argc, char *argv[]){
300
char *plugindir = NULL;
301
char *argfile = NULL;
302
FILE *conffp;
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
303
190
size_t d_name_len;
304
191
DIR *dir = NULL;
305
192
struct dirent *dirst;
313
200
struct sigaction old_sigchld_action;
314
201
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
315
202
.sa_flags = SA_NOCLDSTOP };
316
char **custom_argv = NULL;
317
int custom_argc = 0;
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
206
errno = 0;
318
207
319
208
/* Establish a signal handler */
320
209
sigemptyset(&sigchld_action.sa_mask);
321
210
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
322
if(ret == -1){
211
if(ret < 0){
323
212
perror("sigaddset");
324
exitstatus = EXIT_FAILURE;
325
goto fallback;
213
exit(EXIT_FAILURE);
326
214
}
327
215
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
328
if(ret == -1){
216
if(ret < 0){
329
217
perror("sigaction");
330
exitstatus = EXIT_FAILURE;
331
goto fallback;
218
exit(EXIT_FAILURE);
332
219
}
333
220
334
221
/* The options we understand. */
336
223
{ .name = "global-options", .key = 'g',
337
224
.arg = "OPTION[,OPTION[,...]]",
338
225
.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
226
{ .name = "options-for", .key = 'o',
343
227
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
344
228
.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
229
{ .name = "disable", .key = 'd',
349
230
.arg = "PLUGIN",
350
231
.doc = "Disable a specific plugin", .group = 1 },
351
232
{ .name = "plugin-dir", .key = 128,
352
233
.arg = "DIRECTORY",
353
234
.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 },
235
{ .name = "userid", .key = 129,
236
.arg = "ID", .flags = 0,
237
.doc = "User ID the plugins will run as", .group = 2 },
238
{ .name = "groupid", .key = 130,
239
.arg = "ID", .flags = 0,
240
.doc = "Group ID the plugins will run as", .group = 2 },
241
{ .name = "debug", .key = 131,
242
.doc = "Debug mode", .group = 3 },
365
243
{ .name = NULL }
366
244
};
367
245
368
error_t parse_opt (int key, char *arg, __attribute__((unused))
369
struct argp_state *state) {
246
error_t parse_opt (int key, char *arg, struct argp_state *state) {
370
247
/* Get the INPUT argument from `argp_parse', which we know is a
371
248
pointer to our plugin list pointer. */
249
plugin **plugins = state->input;
372
250
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 */
251
case 'g':
252
if (arg != NULL){
253
char *p = strtok(arg, ",");
254
do{
255
addargument(getplugin(NULL, plugins), p);
256
p = strtok(NULL, ",");
257
} while (p != NULL);
258
}
259
break;
260
case 'o':
261
if (arg != NULL){
262
char *name = strtok(arg, ":");
263
char *p = strtok(NULL, ":");
264
if(p != NULL){
265
p = strtok(p, ",");
266
do{
267
addargument(getplugin(name, plugins), p);
268
p = strtok(NULL, ",");
269
} while (p != NULL);
270
}
271
}
272
break;
273
case 'd':
274
if (arg != NULL){
275
getplugin(arg, plugins)->disabled = true;
276
}
277
break;
278
case 128:
279
plugindir = arg;
280
break;
281
case 129:
466
282
uid = (uid_t)strtol(arg, NULL, 10);
467
283
break;
468
case 131: /* --groupid */
284
case 130:
469
285
gid = (gid_t)strtol(arg, NULL, 10);
470
286
break;
471
case 132: /* --debug */
287
case 131:
472
288
debug = true;
473
289
break;
474
290
case ARGP_KEY_ARG:
475
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
291
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
292
argp_usage (state);
293
}
294
plus_options = arg;
476
295
break;
477
296
case ARGP_KEY_END:
478
297
break;
482
301
return 0;
483
302
}
484
303
304
plugin *plugin_list = NULL;
305
485
306
struct argp argp = { .options = options, .parser = parse_opt,
486
307
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
487
308
.doc = "Mandos plugin runner -- Run plugins" };
488
309
489
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
310
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
490
311
if (ret == ARGP_ERR_UNKNOWN){
491
312
fprintf(stderr, "Unknown error while parsing arguments\n");
492
313
exitstatus = EXIT_FAILURE;
493
goto fallback;
314
goto end;
494
315
}
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){
316
317
if(plus_options){
318
/* This is a mangled argument in the form of
319
"+--option+--other-option=parameter+--yet-another-option", etc */
320
/* Make new argc and argv vars, and call argp_parse() again. */
321
plus_options++; /* skip the first '+' character */
322
const char delims[] = "+";
323
char *arg;
324
int new_argc = 1;
325
plus_argv = malloc(sizeof(char*) * 2);
326
if(plus_argv == NULL){
513
327
perror("malloc");
514
328
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);
329
goto end;
330
}
331
plus_argv[0] = argv[0];
332
plus_argv[1] = NULL;
333
arg = strtok(plus_options, delims); /* Get first argument */
334
while(arg != NULL){
335
new_argc++;
336
plus_argv = realloc(plus_argv, sizeof(char *)
337
* ((unsigned int) new_argc + 1));
338
if(plus_argv == NULL){
339
perror("realloc");
340
exitstatus = EXIT_FAILURE;
341
goto end;
342
}
343
plus_argv[new_argc-1] = arg;
344
plus_argv[new_argc] = NULL;
345
arg = strtok(NULL, delims); /* Get next argument */
346
}
347
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
569
348
if (ret == ARGP_ERR_UNKNOWN){
570
349
fprintf(stderr, "Unknown error while parsing arguments\n");
571
350
exitstatus = EXIT_FAILURE;
572
goto fallback;
351
goto end;
573
352
}
574
353
}
575
354
580
359
for(char **a = p->argv; *a != NULL; a++){
581
360
fprintf(stderr, "\tArg: %s\n", *a);
582
361
}
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
362
}
588
363
}
589
590
/* Strip permissions down to nobody */
364
591
365
ret = setuid(uid);
592
366
if (ret == -1){
593
367
perror("setuid");
594
}
368
}
369
595
370
setgid(gid);
596
371
if (ret == -1){
597
372
perror("setgid");
598
373
}
599
600
if (plugindir == NULL){
601
dir = opendir(PDIR);
602
} else {
603
dir = opendir(plugindir);
604
}
605
374
375
dir = opendir(plugindir);
606
376
if(dir == NULL){
607
377
perror("Could not open plugin dir");
608
378
exitstatus = EXIT_FAILURE;
609
goto fallback;
379
goto end;
610
380
}
611
381
612
382
/* Set the FD_CLOEXEC flag on the directory, if possible */
617
387
if(ret < 0){
618
388
perror("set_cloexec_flag");
619
389
exitstatus = EXIT_FAILURE;
620
goto fallback;
390
goto end;
621
391
}
622
392
}
623
393
}
624
394
625
395
FD_ZERO(&rfds_all);
626
627
/* Read and execute any executable in the plugin directory*/
396
628
397
while(true){
629
398
dirst = readdir(dir);
630
399
633
402
if (errno == EBADF){
634
403
perror("readdir");
635
404
exitstatus = EXIT_FAILURE;
636
goto fallback;
405
goto end;
637
406
}
638
407
break;
639
408
}
661
430
break;
662
431
}
663
432
}
433
664
434
if(bad_name){
665
435
continue;
666
436
}
437
667
438
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
668
439
size_t suf_len = strlen(*suf);
669
440
if((d_name_len >= suf_len)
682
453
continue;
683
454
}
684
455
}
685
686
char *filename;
687
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
688
if(ret < 0){
689
perror("asprintf");
690
continue;
456
457
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
458
if (filename == NULL){
459
perror("malloc");
460
exitstatus = EXIT_FAILURE;
461
goto end;
691
462
}
463
strcpy(filename, plugindir); /* Spurious warning */
464
strcat(filename, "/"); /* Spurious warning */
465
strcat(filename, dirst->d_name); /* Spurious warning */
692
466
693
467
ret = stat(filename, &st);
694
468
if (ret == -1){
695
469
perror("stat");
696
free(filename);
697
continue;
470
exitstatus = EXIT_FAILURE;
471
goto end;
698
472
}
699
700
/* Ignore non-executable files */
473
701
474
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
702
475
if(debug){
703
476
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
706
479
free(filename);
707
480
continue;
708
481
}
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){
482
if(getplugin(dirst->d_name, &plugin_list)->disabled){
717
483
if(debug){
718
484
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
719
485
dirst->d_name);
721
487
free(filename);
722
488
continue;
723
489
}
490
plugin *p = getplugin(dirst->d_name, &plugin_list);
724
491
{
725
492
/* 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];
493
plugin *g = getplugin(NULL, &plugin_list);
494
for(char **a = g->argv + 1; *a != NULL; a++){
495
addargument(p, *a);
496
}
497
}
498
int pipefd[2];
758
499
ret = pipe(pipefd);
759
500
if (ret == -1){
760
501
perror("pipe");
761
502
exitstatus = EXIT_FAILURE;
762
goto fallback;
503
goto end;
763
504
}
764
/* Ask OS to automatic close the pipe on exec */
765
505
ret = set_cloexec_flag(pipefd[0]);
766
506
if(ret < 0){
767
507
perror("set_cloexec_flag");
768
508
exitstatus = EXIT_FAILURE;
769
goto fallback;
509
goto end;
770
510
}
771
511
ret = set_cloexec_flag(pipefd[1]);
772
512
if(ret < 0){
773
513
perror("set_cloexec_flag");
774
514
exitstatus = EXIT_FAILURE;
775
goto fallback;
515
goto end;
776
516
}
777
517
/* Block SIGCHLD until process is safely in process list */
778
518
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
779
519
if(ret < 0){
780
520
perror("sigprocmask");
781
521
exitstatus = EXIT_FAILURE;
782
goto fallback;
522
goto end;
783
523
}
784
524
// Starting a new process to be watched
785
525
pid_t pid = fork();
786
if(pid == -1){
787
perror("fork");
788
exitstatus = EXIT_FAILURE;
789
goto fallback;
790
}
791
526
if(pid == 0){
792
527
/* this is the child process */
793
528
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
812
547
above and must now close it manually here. */
813
548
closedir(dir);
814
549
}
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
}
550
if(execv(filename, p->argv) < 0){
551
perror("execv");
552
_exit(EXIT_FAILURE);
825
553
}
826
554
/* no return */
827
555
}
828
/* Parent process */
829
close(pipefd[1]); /* Close unused write end of pipe */
556
/* parent process */
830
557
free(filename);
831
plugin *new_plugin = getplugin(dirst->d_name);
832
if (new_plugin == NULL){
833
perror("getplugin");
558
close(pipefd[1]); /* close unused write end of pipe */
559
process *new_process = malloc(sizeof(process));
560
if (new_process == NULL){
561
perror("malloc");
834
562
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
835
563
if(ret < 0){
836
perror("sigprocmask");
564
perror("sigprocmask");
837
565
}
838
566
exitstatus = EXIT_FAILURE;
839
goto fallback;
567
goto end;
840
568
}
841
569
842
new_plugin->pid = pid;
843
new_plugin->fd = pipefd[0];
844
570
*new_process = (struct process){ .pid = pid,
571
.fd = pipefd[0],
572
.next = process_list };
573
// List handling
574
process_list = new_process;
845
575
/* Unblock SIGCHLD so signal handler can be run if this process
846
576
has already completed */
847
577
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
848
578
if(ret < 0){
849
579
perror("sigprocmask");
850
580
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
581
goto end;
582
}
583
584
FD_SET(new_process->fd, &rfds_all);
585
586
if (maxfd < new_process->fd){
587
maxfd = new_process->fd;
588
}
589
590
}
591
592
/* Free the plugin list */
593
for(plugin *next; plugin_list != NULL; plugin_list = next){
594
next = plugin_list->next;
595
free(plugin_list->argv);
596
free(plugin_list);
860
597
}
861
598
862
599
closedir(dir);
863
600
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
}
601
602
if (process_list == NULL){
603
fprintf(stderr, "No plugin processes started. Incorrect plugin"
604
" directory?\n");
605
process_list = NULL;
874
606
}
875
876
/* Main loop while running plugins exist */
877
while(plugin_list){
607
while(process_list){
878
608
fd_set rfds = rfds_all;
879
609
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
880
610
if (select_ret == -1){
881
611
perror("select");
882
612
exitstatus = EXIT_FAILURE;
883
goto fallback;
613
goto end;
884
614
}
885
615
/* OK, now either a process completed, or something can be read
886
616
from one of them */
887
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
617
for(process *proc = process_list; proc ; proc = proc->next){
888
618
/* Is this process completely done? */
889
619
if(proc->eof and proc->completed){
890
620
/* Only accept the plugin output if it exited cleanly */
891
621
if(not WIFEXITED(proc->status)
892
622
or WEXITSTATUS(proc->status) != 0){
893
623
/* Bad exit by plugin */
894
895
624
if(debug){
896
625
if(WIFEXITED(proc->status)){
897
626
fprintf(stderr, "Plugin %u exited with status %d\n",
906
635
(unsigned int) (proc->pid));
907
636
}
908
637
}
909
910
638
/* Remove the plugin */
911
639
FD_CLR(proc->fd, &rfds_all);
912
913
640
/* Block signal while modifying process_list */
914
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
641
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
915
642
if(ret < 0){
916
643
perror("sigprocmask");
917
644
exitstatus = EXIT_FAILURE;
918
goto fallback;
919
}
920
free_plugin(proc);
645
goto end;
646
}
647
/* Delete this process entry from the list */
648
if(process_list == proc){
649
/* First one - simple */
650
process_list = proc->next;
651
} else {
652
/* Second one or later */
653
for(process *p = process_list; p != NULL; p = p->next){
654
if(p->next == proc){
655
p->next = proc->next;
656
break;
657
}
658
}
659
}
921
660
/* We are done modifying process list, so unblock signal */
922
661
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
923
662
NULL);
924
663
if(ret < 0){
925
664
perror("sigprocmask");
926
exitstatus = EXIT_FAILURE;
927
goto fallback;
928
}
929
930
if(plugin_list == NULL){
931
break;
932
}
933
continue;
665
}
666
free(proc->buffer);
667
free(proc);
668
/* We deleted this process from the list, so we can't go
669
proc->next. Therefore, start over from the beginning of
670
the process list */
671
break;
934
672
}
935
936
673
/* This process exited nicely, so print its buffer */
937
674
938
bool bret = print_out_password(proc->buffer,
939
proc->buffer_length);
675
bool bret = print_out_password(proc->buffer, proc->buffer_length);
940
676
if(not bret){
941
677
perror("print_out_password");
942
678
exitstatus = EXIT_FAILURE;
943
679
}
944
goto fallback;
680
goto end;
945
681
}
946
947
682
/* This process has not completed. Does it have any output? */
948
683
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
949
684
/* This process had nothing to say at this time */
956
691
if (proc->buffer == NULL){
957
692
perror("malloc");
958
693
exitstatus = EXIT_FAILURE;
959
goto fallback;
694
goto end;
960
695
}
961
696
proc->buffer_size += BUFFER_SIZE;
962
697
}
977
712
}
978
713
979
714
980
fallback:
715
end:
981
716
982
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
983
/* Fallback if all plugins failed, none are found or an error
984
occured */
717
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
718
/* Fallback if all plugins failed or an error occured */
985
719
bool bret;
986
720
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
987
721
char *passwordbuffer = getpass("Password: ");
989
723
if(not bret){
990
724
perror("print_out_password");
991
725
exitstatus = EXIT_FAILURE;
726
goto end;
992
727
}
993
728
}
994
729
995
730
/* 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);
731
sigaction(SIGCHLD, &old_sigchld_action, NULL);
732
733
free(plus_argv);
734
735
/* Free the plugin list */
736
for(plugin *next; plugin_list != NULL; plugin_list = next){
737
next = plugin_list->next;
738
free(plugin_list->argv);
739
free(plugin_list);
1007
740
}
1008
741
1009
742
if(dir != NULL){
1011
744
}
1012
745
1013
746
/* 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
}
747
for(process *next; process_list != NULL; process_list = next){
748
next = process_list->next;
749
close(process_list->fd);
750
ret = kill(process_list->pid, SIGTERM);
751
if(ret == -1 and errno != ESRCH){
752
/* set-uid proccesses migth not get closed */
753
perror("kill");
1022
754
}
755
free(process_list->buffer);
756
free(process_list);
1023
757
}
1024
758
1025
759
/* Wait for any remaining child processes to terminate */
1029
763
if(errno != ECHILD){
1030
764
perror("wait");
1031
765
}
1032
1033
free_plugin_list();
1034
1035
free(plugindir);
1036
free(argfile);
1037
766
1038
767
return exitstatus;
1039
768
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0