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- Committer: Björn Påhlsson
- Date: 2008-08-15 20:17:32 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 77.
- Revision ID: belorn@braxen-20080815201732-b7uux3yqs05b3fy9
Added configuration files support for mandos-client
Removed plus argument support for mandos-client
Removed plus argument support for mandos-client
- 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> /* strsep, 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,
65
65
#include <errno.h> /* errno, EBADF */
66
66
67
67
#define BUFFER_SIZE 256
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";
68
#define CONFFILE "/conf/conf.d/mandos/client.conf"
69
70
const char *argp_program_version = "mandos-client 1.0";
73
71
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
72
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*/
73
struct process;
74
75
typedef struct process{
86
76
pid_t pid;
87
77
int fd;
88
78
char *buffer;
89
79
size_t buffer_size;
90
80
size_t buffer_length;
91
81
bool eof;
92
volatile bool completed;
93
volatile int status;
82
bool completed;
83
int status;
84
struct process *next;
85
} process;
86
87
typedef struct plugin{
88
char *name; /* can be NULL or any plugin name */
89
char **argv;
90
int argc;
91
bool disabled;
94
92
struct plugin *next;
95
93
} plugin;
96
94
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){
95
static plugin *getplugin(char *name, plugin **plugin_list){
96
for (plugin *p = *plugin_list; p != NULL; p = p->next){
104
97
if ((p->name == name)
105
98
or (p->name and name and (strcmp(p->name, name) == 0))){
106
99
return p;
109
102
/* Create a new plugin */
110
103
plugin *new_plugin = malloc(sizeof(plugin));
111
104
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
105
perror("malloc");
106
exit(EXIT_FAILURE);
107
}
108
new_plugin->name = name;
127
109
new_plugin->argv = malloc(sizeof(char *) * 2);
128
110
if (new_plugin->argv == NULL){
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
111
perror("malloc");
112
exit(EXIT_FAILURE);
132
113
}
133
new_plugin->argv[0] = copy_name;
114
new_plugin->argv[0] = name;
134
115
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
116
new_plugin->argc = 1;
117
new_plugin->disabled = false;
118
new_plugin->next = *plugin_list;
145
119
/* Append the new plugin to the list */
146
plugin_list = new_plugin;
120
*plugin_list = new_plugin;
147
121
return new_plugin;
148
122
}
149
123
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));
124
static void addargument(plugin *p, char *arg){
125
p->argv[p->argc] = arg;
126
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
127
if (p->argv == NULL){
128
perror("malloc");
129
exit(EXIT_FAILURE);
130
}
131
p->argc++;
132
p->argv[p->argc] = NULL;
204
133
}
205
134
206
135
/*
219
148
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
220
149
}
221
150
151
process *process_list = NULL;
222
152
223
/* Mark processes as completed when they exit, and save their exit
153
/* Mark a process as completed when it exits, and save its exit
224
154
status. */
225
155
void handle_sigchld(__attribute__((unused)) int sig){
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
156
process *proc = process_list;
157
int status;
158
pid_t pid = wait(&status);
159
if(pid == -1){
160
perror("wait");
161
return;
162
}
163
while(proc != NULL and proc->pid != pid){
164
proc = proc->next;
165
}
166
if(proc == NULL){
167
/* Process not found in process list */
168
return;
169
}
170
proc->status = status;
171
proc->completed = true;
253
172
}
254
173
255
/* Prints out a password to stdout */
256
174
bool print_out_password(const char *buffer, size_t length){
257
175
ssize_t ret;
258
176
if(length>0 and buffer[length-1] == '\n'){
268
186
return true;
269
187
}
270
188
271
/* Removes and free a plugin from the plugin list */
272
static void free_plugin(plugin *plugin_node){
273
274
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
275
free(*arg);
276
}
277
free(plugin_node->argv);
278
for(char **env = plugin_node->environ; *env != NULL; env++){
279
free(*env);
280
}
281
free(plugin_node->environ);
282
free(plugin_node->buffer);
189
char ** addcustomargument(char **argv, int *argc, char *arg){
283
190
284
/* Removes the plugin from the singly-linked list */
285
if(plugin_node == plugin_list){
286
/* First one - simple */
287
plugin_list = plugin_list->next;
288
} else {
289
/* Second one or later */
290
for(plugin *p = plugin_list; p != NULL; p = p->next){
291
if(p->next == plugin_node){
292
p->next = plugin_node->next;
293
break;
294
}
191
if (argv == NULL){
192
*argc = 1;
193
argv = malloc(sizeof(char*) * 2);
194
if(argv == NULL){
195
return NULL;
295
196
}
296
}
297
298
free(plugin_node);
299
}
300
301
static void free_plugin_list(void){
302
while(plugin_list != NULL){
303
free_plugin(plugin_list);
304
}
197
argv[0] = NULL; /* Will be set to argv[0] in main before parsing */
198
argv[1] = NULL;
199
}
200
*argc += 1;
201
argv = realloc(argv, sizeof(char *)
202
* ((unsigned int) *argc + 1));
203
if(argv == NULL){
204
return NULL;
205
}
206
argv[*argc-1] = arg;
207
argv[*argc] = NULL;
208
return argv;
305
209
}
306
210
307
211
int main(int argc, char *argv[]){
308
char *plugindir = NULL;
309
char *argfile = NULL;
212
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
213
const char *conffile = CONFFILE;
310
214
FILE *conffp;
311
215
size_t d_name_len;
312
216
DIR *dir = NULL;
327
231
/* Establish a signal handler */
328
232
sigemptyset(&sigchld_action.sa_mask);
329
233
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
330
if(ret == -1){
234
if(ret < 0){
331
235
perror("sigaddset");
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
236
exit(EXIT_FAILURE);
334
237
}
335
238
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
336
if(ret == -1){
239
if(ret < 0){
337
240
perror("sigaction");
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
241
exit(EXIT_FAILURE);
340
242
}
341
243
342
244
/* The options we understand. */
344
246
{ .name = "global-options", .key = 'g',
345
247
.arg = "OPTION[,OPTION[,...]]",
346
248
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
350
249
{ .name = "options-for", .key = 'o',
351
250
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
352
251
.doc = "Options passed only to specified plugin" },
353
{ .name = "env-for", .key = 'E',
354
.arg = "PLUGIN:ENV=value",
355
.doc = "Environment variable passed to specified plugin" },
356
252
{ .name = "disable", .key = 'd',
357
253
.arg = "PLUGIN",
358
254
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
362
255
{ .name = "plugin-dir", .key = 128,
363
256
.arg = "DIRECTORY",
364
257
.doc = "Specify a different plugin directory", .group = 2 },
365
{ .name = "config-file", .key = 129,
366
.arg = "FILE",
367
.doc = "Specify a different configuration file", .group = 2 },
368
{ .name = "userid", .key = 130,
369
.arg = "ID", .flags = 0,
370
.doc = "User ID the plugins will run as", .group = 3 },
371
{ .name = "groupid", .key = 131,
372
.arg = "ID", .flags = 0,
373
.doc = "Group ID the plugins will run as", .group = 3 },
374
{ .name = "debug", .key = 132,
375
.doc = "Debug mode", .group = 4 },
258
{ .name = "userid", .key = 129,
259
.arg = "ID", .flags = 0,
260
.doc = "User ID the plugins will run as", .group = 2 },
261
{ .name = "groupid", .key = 130,
262
.arg = "ID", .flags = 0,
263
.doc = "Group ID the plugins will run as", .group = 2 },
264
{ .name = "debug", .key = 131,
265
.doc = "Debug mode", .group = 3 },
376
266
{ .name = NULL }
377
267
};
378
268
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
270
/* Get the INPUT argument from `argp_parse', which we know is a
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
381
273
switch (key) {
382
case 'g': /* --global-options */
274
case 'g':
383
275
if (arg != NULL){
384
276
char *p;
385
277
while((p = strsep(&arg, ",")) != NULL){
386
278
if(p[0] == '\0'){
387
279
continue;
388
280
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
281
addargument(getplugin(NULL, plugins), p);
393
282
}
394
283
}
395
284
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
if(not add_environment(getplugin(NULL), arg, true)){
401
perror("add_environment");
402
}
403
break;
404
case 'o': /* --options-for */
285
case 'o':
405
286
if (arg != NULL){
406
char *p_name = strsep(&arg, ":");
407
if(p_name[0] == '\0' or arg == NULL){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
408
289
break;
409
290
}
410
291
char *opt = strsep(&arg, ":");
411
if(opt[0] == '\0' or opt == NULL){
412
break;
413
}
414
char *p;
415
while((p = strsep(&opt, ",")) != NULL){
416
if(p[0] == '\0'){
417
continue;
418
}
419
if(not add_argument(getplugin(p_name), p)){
420
perror("add_argument");
421
return ARGP_ERR_UNKNOWN;
422
}
423
}
424
}
425
break;
426
case 'E': /* --env-for */
427
if(arg == NULL){
428
break;
429
}
430
{
431
char *envdef = strchr(arg, ':');
432
if(envdef == NULL){
433
break;
434
}
435
*envdef = '\0';
436
if(not add_environment(getplugin(arg), envdef+1, true)){
437
perror("add_environment");
438
}
439
}
440
break;
441
case 'd': /* --disable */
442
if (arg != NULL){
443
plugin *p = getplugin(arg);
444
if(p == NULL){
445
return ARGP_ERR_UNKNOWN;
446
}
447
p->disabled = true;
448
}
449
break;
450
case 'e': /* --enable */
451
if (arg != NULL){
452
plugin *p = getplugin(arg);
453
if(p == NULL){
454
return ARGP_ERR_UNKNOWN;
455
}
456
p->disabled = false;
457
}
458
break;
459
case 128: /* --plugin-dir */
460
free(plugindir);
461
plugindir = strdup(arg);
462
if(plugindir == NULL){
463
perror("strdup");
464
}
465
break;
466
case 129: /* --config-file */
467
/* This is already done by parse_opt_config_file() */
468
break;
469
case 130: /* --userid */
292
if(opt[0] == '\0'){
293
break;
294
}
295
if(opt != NULL){
296
char *p;
297
while((p = strsep(&opt, ",")) != NULL){
298
if(p[0] == '\0'){
299
continue;
300
}
301
addargument(getplugin(name, plugins), p);
302
}
303
}
304
}
305
break;
306
case 'd':
307
if (arg != NULL){
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
470
315
uid = (uid_t)strtol(arg, NULL, 10);
471
316
break;
472
case 131: /* --groupid */
317
case 130:
473
318
gid = (gid_t)strtol(arg, NULL, 10);
474
319
break;
475
case 132: /* --debug */
320
case 131:
476
321
debug = true;
477
322
break;
478
323
case ARGP_KEY_ARG:
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
480
break;
481
case ARGP_KEY_END:
482
break;
483
default:
484
return ARGP_ERR_UNKNOWN;
485
}
486
return 0;
487
}
488
489
/* This option parser is the same as parse_opt() above, except it
490
ignores everything but the --config-file option. */
491
error_t parse_opt_config_file (int key, char *arg,
492
__attribute__((unused))
493
struct argp_state *state) {
494
switch (key) {
495
case 'g': /* --global-options */
496
case 'G': /* --global-env */
497
case 'o': /* --options-for */
498
case 'E': /* --env-for */
499
case 'd': /* --disable */
500
case 'e': /* --enable */
501
case 128: /* --plugin-dir */
502
break;
503
case 129: /* --config-file */
504
free(argfile);
505
argfile = strdup(arg);
506
if(argfile == NULL){
507
perror("strdup");
508
}
509
break;
510
case 130: /* --userid */
511
case 131: /* --groupid */
512
case 132: /* --debug */
513
case ARGP_KEY_ARG:
514
case ARGP_KEY_END:
515
break;
516
default:
517
return ARGP_ERR_UNKNOWN;
518
}
519
return 0;
520
}
521
522
struct argp argp = { .options = options,
523
.parser = parse_opt_config_file,
524
.args_doc = "",
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
325
break;
326
case ARGP_KEY_END:
327
break;
328
default:
329
return ARGP_ERR_UNKNOWN;
330
}
331
return 0;
332
}
333
334
plugin *plugin_list = NULL;
335
336
struct argp argp = { .options = options, .parser = parse_opt,
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
525
338
.doc = "Mandos plugin runner -- Run plugins" };
526
339
527
/* Parse using the parse_opt_config_file in order to get the custom
528
config file location, if any. */
529
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
530
341
if (ret == ARGP_ERR_UNKNOWN){
531
342
fprintf(stderr, "Unknown error while parsing arguments\n");
532
343
exitstatus = EXIT_FAILURE;
533
goto fallback;
344
goto end;
534
345
}
535
536
/* Reset to the normal argument parser */
537
argp.parser = parse_opt;
538
539
/* Open the configfile if available */
540
if (argfile == NULL){
541
conffp = fopen(AFILE, "r");
542
} else {
543
conffp = fopen(argfile, "r");
544
}
346
347
conffp = fopen(conffile, "r");
545
348
if(conffp != NULL){
546
349
char *org_line = NULL;
547
char *p, *arg, *new_arg, *line;
548
350
size_t size = 0;
549
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
550
353
const char whitespace_delims[] = " \r\t\f\v\n";
551
354
const char comment_delim[] = "#";
552
355
553
custom_argc = 1;
554
custom_argv = malloc(sizeof(char*) * 2);
555
if(custom_argv == NULL){
556
perror("malloc");
557
exitstatus = EXIT_FAILURE;
558
goto fallback;
559
}
560
custom_argv[0] = argv[0];
561
custom_argv[1] = NULL;
562
563
/* for each line in the config file, strip whitespace and ignore
564
commented text */
565
356
while(true){
566
357
sret = getline(&org_line, &size, conffp);
567
358
if(sret == -1){
575
366
continue;
576
367
}
577
368
new_arg = strdup(p);
578
if(new_arg == NULL){
579
perror("strdup");
580
exitstatus = EXIT_FAILURE;
581
free(org_line);
582
goto fallback;
583
}
584
585
custom_argc += 1;
586
custom_argv = realloc(custom_argv, sizeof(char *)
587
* ((unsigned int) custom_argc + 1));
588
if(custom_argv == NULL){
589
perror("realloc");
590
exitstatus = EXIT_FAILURE;
591
free(org_line);
592
goto fallback;
593
}
594
custom_argv[custom_argc-1] = new_arg;
595
custom_argv[custom_argc] = NULL;
369
custom_argv = addcustomargument(custom_argv, &custom_argc, new_arg);
370
if (custom_argv == NULL){
371
perror("addcustomargument");
372
exitstatus = EXIT_FAILURE;
373
goto end;
374
}
596
375
}
597
376
}
598
377
free(org_line);
599
} else {
600
/* Check for harmful errors and go to fallback. Other errors might
601
not affect opening plugins */
378
} else{
379
/* check for harmfull errors */
602
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
603
381
perror("fopen");
604
382
exitstatus = EXIT_FAILURE;
605
goto fallback;
383
goto end;
606
384
}
607
385
}
608
/* If there was any arguments from configuration file,
609
pass them to parser as command arguments */
386
610
387
if(custom_argv != NULL){
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
612
0, NULL);
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
613
390
if (ret == ARGP_ERR_UNKNOWN){
614
391
fprintf(stderr, "Unknown error while parsing arguments\n");
615
392
exitstatus = EXIT_FAILURE;
616
goto fallback;
393
goto end;
617
394
}
618
395
}
619
396
620
/* Parse actual command line arguments, to let them override the
621
config file */
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
626
goto fallback;
627
}
628
629
397
if(debug){
630
398
for(plugin *p = plugin_list; p != NULL; p=p->next){
631
399
fprintf(stderr, "Plugin: %s has %d arguments\n",
633
401
for(char **a = p->argv; *a != NULL; a++){
634
402
fprintf(stderr, "\tArg: %s\n", *a);
635
403
}
636
fprintf(stderr, "...and %u environment variables\n", p->envc);
637
for(char **a = p->environ; *a != NULL; a++){
638
fprintf(stderr, "\t%s\n", *a);
639
}
640
404
}
641
405
}
642
406
643
/* Strip permissions down to nobody */
644
407
ret = setuid(uid);
645
408
if (ret == -1){
646
409
perror("setuid");
647
}
410
}
411
648
412
setgid(gid);
649
413
if (ret == -1){
650
414
perror("setgid");
651
415
}
652
416
653
if (plugindir == NULL){
654
dir = opendir(PDIR);
655
} else {
656
dir = opendir(plugindir);
657
}
658
417
dir = opendir(plugindir);
659
418
if(dir == NULL){
660
419
perror("Could not open plugin dir");
661
420
exitstatus = EXIT_FAILURE;
662
goto fallback;
421
goto end;
663
422
}
664
423
665
424
/* Set the FD_CLOEXEC flag on the directory, if possible */
670
429
if(ret < 0){
671
430
perror("set_cloexec_flag");
672
431
exitstatus = EXIT_FAILURE;
673
goto fallback;
432
goto end;
674
433
}
675
434
}
676
435
}
677
436
678
437
FD_ZERO(&rfds_all);
679
438
680
/* Read and execute any executable in the plugin directory*/
681
439
while(true){
682
440
dirst = readdir(dir);
683
441
684
/* All directory entries have been processed */
442
// All directory entries have been processed
685
443
if(dirst == NULL){
686
444
if (errno == EBADF){
687
445
perror("readdir");
688
446
exitstatus = EXIT_FAILURE;
689
goto fallback;
447
goto end;
690
448
}
691
449
break;
692
450
}
693
451
694
452
d_name_len = strlen(dirst->d_name);
695
453
696
/* Ignore dotfiles, backup files and other junk */
454
// Ignore dotfiles, backup files and other junk
697
455
{
698
456
bool bad_name = false;
699
457
714
472
break;
715
473
}
716
474
}
475
717
476
if(bad_name){
718
477
continue;
719
478
}
479
720
480
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
721
481
size_t suf_len = strlen(*suf);
722
482
if((d_name_len >= suf_len)
735
495
continue;
736
496
}
737
497
}
738
739
char *filename;
740
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(ret < 0){
742
perror("asprintf");
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
743
502
continue;
744
503
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
745
507
746
508
ret = stat(filename, &st);
747
509
if (ret == -1){
749
511
free(filename);
750
512
continue;
751
513
}
752
753
/* Ignore non-executable files */
514
754
515
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
755
516
if(debug){
756
517
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
759
520
free(filename);
760
521
continue;
761
522
}
762
763
plugin *p = getplugin(dirst->d_name);
764
if(p == NULL){
765
perror("getplugin");
766
free(filename);
767
continue;
768
}
769
if(p->disabled){
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
524
if(debug){
771
525
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
772
526
dirst->d_name);
774
528
free(filename);
775
529
continue;
776
530
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
777
532
{
778
533
/* Add global arguments to argument list for this plugin */
779
plugin *g = getplugin(NULL);
780
if(g != NULL){
781
for(char **a = g->argv + 1; *a != NULL; a++){
782
if(not add_argument(p, *a)){
783
perror("add_argument");
784
}
785
}
786
/* Add global environment variables */
787
for(char **e = g->environ; *e != NULL; e++){
788
if(not add_environment(p, *e, false)){
789
perror("add_environment");
790
}
791
}
792
}
793
}
794
/* If this plugin has any environment variables, we will call
795
using execve and need to duplicate the environment from this
796
process, too. */
797
if(p->environ[0] != NULL){
798
for(char **e = environ; *e != NULL; e++){
799
if(not add_environment(p, *e, false)){
800
perror("add_environment");
801
}
802
}
803
}
804
805
int pipefd[2];
534
plugin *g = getplugin(NULL, &plugin_list);
535
for(char **a = g->argv + 1; *a != NULL; a++){
536
addargument(p, *a);
537
}
538
}
539
int pipefd[2];
806
540
ret = pipe(pipefd);
807
541
if (ret == -1){
808
542
perror("pipe");
809
543
exitstatus = EXIT_FAILURE;
810
goto fallback;
544
goto end;
811
545
}
812
/* Ask OS to automatic close the pipe on exec */
813
546
ret = set_cloexec_flag(pipefd[0]);
814
547
if(ret < 0){
815
548
perror("set_cloexec_flag");
816
549
exitstatus = EXIT_FAILURE;
817
goto fallback;
550
goto end;
818
551
}
819
552
ret = set_cloexec_flag(pipefd[1]);
820
553
if(ret < 0){
821
554
perror("set_cloexec_flag");
822
555
exitstatus = EXIT_FAILURE;
823
goto fallback;
556
goto end;
824
557
}
825
558
/* Block SIGCHLD until process is safely in process list */
826
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
827
560
if(ret < 0){
828
561
perror("sigprocmask");
829
562
exitstatus = EXIT_FAILURE;
830
goto fallback;
563
goto end;
831
564
}
832
/* Starting a new process to be watched */
565
// Starting a new process to be watched
833
566
pid_t pid = fork();
834
567
if(pid == -1){
835
568
perror("fork");
836
569
exitstatus = EXIT_FAILURE;
837
goto fallback;
570
goto end;
838
571
}
839
572
if(pid == 0){
840
573
/* this is the child process */
860
593
above and must now close it manually here. */
861
594
closedir(dir);
862
595
}
863
if(p->environ[0] == NULL){
864
if(execv(filename, p->argv) < 0){
865
perror("execv");
866
_exit(EXIT_FAILURE);
867
}
868
} else {
869
if(execve(filename, p->argv, p->environ) < 0){
870
perror("execve");
871
_exit(EXIT_FAILURE);
872
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
873
599
}
874
600
/* no return */
875
601
}
876
/* Parent process */
877
close(pipefd[1]); /* Close unused write end of pipe */
602
/* parent process */
878
603
free(filename);
879
plugin *new_plugin = getplugin(dirst->d_name);
880
if (new_plugin == NULL){
881
perror("getplugin");
604
close(pipefd[1]); /* close unused write end of pipe */
605
process *new_process = malloc(sizeof(process));
606
if (new_process == NULL){
607
perror("malloc");
882
608
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
883
609
if(ret < 0){
884
perror("sigprocmask");
610
perror("sigprocmask");
885
611
}
886
612
exitstatus = EXIT_FAILURE;
887
goto fallback;
613
goto end;
888
614
}
889
615
890
new_plugin->pid = pid;
891
new_plugin->fd = pipefd[0];
892
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
893
621
/* Unblock SIGCHLD so signal handler can be run if this process
894
622
has already completed */
895
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
896
624
if(ret < 0){
897
625
perror("sigprocmask");
898
626
exitstatus = EXIT_FAILURE;
899
goto fallback;
900
}
901
902
FD_SET(new_plugin->fd, &rfds_all);
903
904
if (maxfd < new_plugin->fd){
905
maxfd = new_plugin->fd;
906
}
907
627
goto end;
628
}
629
630
FD_SET(new_process->fd, &rfds_all);
631
632
if (maxfd < new_process->fd){
633
maxfd = new_process->fd;
634
}
635
636
}
637
638
/* Free the plugin list */
639
for(plugin *next; plugin_list != NULL; plugin_list = next){
640
next = plugin_list->next;
641
free(plugin_list->argv);
642
free(plugin_list);
908
643
}
909
644
910
645
closedir(dir);
911
646
dir = NULL;
912
913
for(plugin *p = plugin_list; p != NULL; p = p->next){
914
if(p->pid != 0){
915
break;
916
}
917
if(p->next == NULL){
918
fprintf(stderr, "No plugin processes started. Incorrect plugin"
919
" directory?\n");
920
free_plugin_list();
921
}
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
922
652
}
923
924
/* Main loop while running plugins exist */
925
while(plugin_list){
653
while(process_list){
926
654
fd_set rfds = rfds_all;
927
655
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
928
656
if (select_ret == -1){
929
657
perror("select");
930
658
exitstatus = EXIT_FAILURE;
931
goto fallback;
659
goto end;
932
660
}
933
661
/* OK, now either a process completed, or something can be read
934
662
from one of them */
935
for(plugin *proc = plugin_list; proc != NULL;){
663
for(process *proc = process_list; proc ; proc = proc->next){
936
664
/* Is this process completely done? */
937
665
if(proc->eof and proc->completed){
938
666
/* Only accept the plugin output if it exited cleanly */
939
667
if(not WIFEXITED(proc->status)
940
668
or WEXITSTATUS(proc->status) != 0){
941
669
/* Bad exit by plugin */
942
943
670
if(debug){
944
671
if(WIFEXITED(proc->status)){
945
672
fprintf(stderr, "Plugin %u exited with status %d\n",
954
681
(unsigned int) (proc->pid));
955
682
}
956
683
}
957
958
684
/* Remove the plugin */
959
685
FD_CLR(proc->fd, &rfds_all);
960
961
686
/* Block signal while modifying process_list */
962
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
963
688
if(ret < 0){
964
689
perror("sigprocmask");
965
690
exitstatus = EXIT_FAILURE;
966
goto fallback;
967
}
968
691
goto end;
692
}
693
/* Delete this process entry from the list */
694
if(process_list == proc){
695
/* First one - simple */
696
process_list = proc->next;
697
} else {
698
/* Second one or later */
699
for(process *p = process_list; p != NULL; p = p->next){
700
if(p->next == proc){
701
p->next = proc->next;
702
break;
703
}
704
}
705
}
969
706
/* We are done modifying process list, so unblock signal */
970
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
971
708
NULL);
972
709
if(ret < 0){
973
710
perror("sigprocmask");
974
exitstatus = EXIT_FAILURE;
975
goto fallback;
976
}
977
978
if(plugin_list == NULL){
979
break;
980
}
981
982
plugin *next_plugin = proc->next;
983
free_plugin(proc);
984
proc = next_plugin;
985
continue;
711
}
712
free(proc->buffer);
713
free(proc);
714
/* We deleted this process from the list, so we can't go
715
proc->next. Therefore, start over from the beginning of
716
the process list */
717
break;
986
718
}
987
988
719
/* This process exited nicely, so print its buffer */
989
720
990
bool bret = print_out_password(proc->buffer,
991
proc->buffer_length);
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
992
722
if(not bret){
993
723
perror("print_out_password");
994
724
exitstatus = EXIT_FAILURE;
995
725
}
996
goto fallback;
726
goto end;
997
727
}
998
999
728
/* This process has not completed. Does it have any output? */
1000
729
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
1001
730
/* This process had nothing to say at this time */
1002
proc = proc->next;
1003
731
continue;
1004
732
}
1005
733
/* Before reading, make the process' data buffer large enough */
1009
737
if (proc->buffer == NULL){
1010
738
perror("malloc");
1011
739
exitstatus = EXIT_FAILURE;
1012
goto fallback;
740
goto end;
1013
741
}
1014
742
proc->buffer_size += BUFFER_SIZE;
1015
743
}
1018
746
BUFFER_SIZE);
1019
747
if(ret < 0){
1020
748
/* Read error from this process; ignore the error */
1021
proc = proc->next;
1022
749
continue;
1023
750
}
1024
751
if(ret == 0){
1031
758
}
1032
759
1033
760
1034
fallback:
761
end:
1035
762
1036
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1037
/* Fallback if all plugins failed, none are found or an error
1038
occured */
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
1039
765
bool bret;
1040
766
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1041
767
char *passwordbuffer = getpass("Password: ");
1043
769
if(not bret){
1044
770
perror("print_out_password");
1045
771
exitstatus = EXIT_FAILURE;
772
goto end;
1046
773
}
1047
774
}
1048
775
1049
776
/* Restore old signal handler */
1050
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1051
if(ret == -1){
1052
perror("sigaction");
1053
exitstatus = EXIT_FAILURE;
1054
}
1055
1056
if(custom_argv != NULL){
1057
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1058
free(*arg);
1059
}
1060
free(custom_argv);
777
sigaction(SIGCHLD, &old_sigchld_action, NULL);
778
779
free(custom_argv);
780
781
/* Free the plugin list */
782
for(plugin *next; plugin_list != NULL; plugin_list = next){
783
next = plugin_list->next;
784
free(plugin_list->argv);
785
free(plugin_list);
1061
786
}
1062
787
1063
788
if(dir != NULL){
1065
790
}
1066
791
1067
792
/* Free the process list and kill the processes */
1068
for(plugin *p = plugin_list; p != NULL; p = p->next){
1069
if(p->pid != 0){
1070
close(p->fd);
1071
ret = kill(p->pid, SIGTERM);
1072
if(ret == -1 and errno != ESRCH){
1073
/* Set-uid proccesses might not get closed */
1074
perror("kill");
1075
}
793
for(process *next; process_list != NULL; process_list = next){
794
next = process_list->next;
795
close(process_list->fd);
796
ret = kill(process_list->pid, SIGTERM);
797
if(ret == -1 and errno != ESRCH){
798
/* set-uid proccesses migth not get closed */
799
perror("kill");
1076
800
}
801
free(process_list->buffer);
802
free(process_list);
1077
803
}
1078
804
1079
805
/* Wait for any remaining child processes to terminate */
1083
809
if(errno != ECHILD){
1084
810
perror("wait");
1085
811
}
1086
1087
free_plugin_list();
1088
1089
free(plugindir);
1090
free(argfile);
1091
812
1092
813
return exitstatus;
1093
814
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0