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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 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){
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));
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 = 'e',
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 = 'f',
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
255
{ .name = "plugin-dir", .key = 128,
360
256
.arg = "DIRECTORY",
361
257
.doc = "Specify a different plugin directory", .group = 2 },
362
{ .name = "config-file", .key = 129,
363
.arg = "FILE",
364
.doc = "Specify a different configuration file", .group = 2 },
365
{ .name = "userid", .key = 130,
366
.arg = "ID", .flags = 0,
367
.doc = "User ID the plugins will run as", .group = 3 },
368
{ .name = "groupid", .key = 131,
369
.arg = "ID", .flags = 0,
370
.doc = "Group ID the plugins will run as", .group = 3 },
371
{ .name = "debug", .key = 132,
372
.doc = "Debug mode", .group = 4 },
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 },
373
266
{ .name = NULL }
374
267
};
375
268
376
error_t parse_opt (int key, char *arg, __attribute__((unused))
377
struct argp_state *state) {
269
error_t parse_opt (int key, char *arg, struct argp_state *state) {
378
270
/* Get the INPUT argument from `argp_parse', which we know is a
379
271
pointer to our plugin list pointer. */
272
plugin **plugins = state->input;
380
273
switch (key) {
381
case 'g': /* --global-options */
274
case 'g':
382
275
if (arg != NULL){
383
276
char *p;
384
277
while((p = strsep(&arg, ",")) != NULL){
385
278
if(p[0] == '\0'){
386
279
continue;
387
280
}
388
if(not add_argument(getplugin(NULL), p)){
389
perror("add_argument");
390
return ARGP_ERR_UNKNOWN;
391
}
392
}
393
}
394
break;
395
case 'e': /* --global-env */
396
if(arg == NULL){
397
break;
398
}
399
{
400
char *envdef = strdup(arg);
401
if(envdef == NULL){
402
break;
403
}
404
if(not add_environment(getplugin(NULL), envdef, true)){
405
perror("add_environment");
406
}
407
}
408
break;
409
case 'o': /* --options-for */
281
addargument(getplugin(NULL, plugins), p);
282
}
283
}
284
break;
285
case 'o':
410
286
if (arg != NULL){
411
char *p_name = strsep(&arg, ":");
412
if(p_name[0] == '\0'){
287
char *name = strsep(&arg, ":");
288
if(name[0] == '\0'){
413
289
break;
414
290
}
415
291
char *opt = strsep(&arg, ":");
422
298
if(p[0] == '\0'){
423
299
continue;
424
300
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
301
addargument(getplugin(name, plugins), p);
429
302
}
430
303
}
431
304
}
432
305
break;
433
case 'f': /* --env-for */
434
if(arg == NULL){
435
break;
436
}
437
{
438
char *envdef = strchr(arg, ':');
439
if(envdef == NULL){
440
break;
441
}
442
char *p_name = strndup(arg, (size_t) (envdef-arg));
443
if(p_name == NULL){
444
break;
445
}
446
envdef++;
447
if(not add_environment(getplugin(p_name), envdef, true)){
448
perror("add_environment");
449
}
450
}
451
break;
452
case 'd': /* --disable */
306
case 'd':
453
307
if (arg != NULL){
454
plugin *p = getplugin(arg);
455
if(p == NULL){
456
return ARGP_ERR_UNKNOWN;
457
}
458
p->disabled = true;
459
}
460
break;
461
case 128: /* --plugin-dir */
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
argfile = strdup(arg);
469
if(argfile == NULL){
470
perror("strdup");
471
}
472
break;
473
case 130: /* --userid */
308
getplugin(arg, plugins)->disabled = true;
309
}
310
break;
311
case 128:
312
plugindir = arg;
313
break;
314
case 129:
474
315
uid = (uid_t)strtol(arg, NULL, 10);
475
316
break;
476
case 131: /* --groupid */
317
case 130:
477
318
gid = (gid_t)strtol(arg, NULL, 10);
478
319
break;
479
case 132: /* --debug */
320
case 131:
480
321
debug = true;
481
322
break;
482
323
case ARGP_KEY_ARG:
483
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
324
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
484
325
break;
485
326
case ARGP_KEY_END:
486
327
break;
490
331
return 0;
491
332
}
492
333
334
plugin *plugin_list = NULL;
335
493
336
struct argp argp = { .options = options, .parser = parse_opt,
494
.args_doc = "",
337
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
495
338
.doc = "Mandos plugin runner -- Run plugins" };
496
339
497
/* Open the configfile if available */
498
if (argfile == NULL){
499
conffp = fopen(AFILE, "r");
500
} else {
501
conffp = fopen(argfile, "r");
502
}
340
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
341
if (ret == ARGP_ERR_UNKNOWN){
342
fprintf(stderr, "Unknown error while parsing arguments\n");
343
exitstatus = EXIT_FAILURE;
344
goto end;
345
}
346
347
conffp = fopen(conffile, "r");
503
348
if(conffp != NULL){
504
349
char *org_line = NULL;
505
char *p, *arg, *new_arg, *line;
506
350
size_t size = 0;
507
351
ssize_t sret;
352
char *p, *arg, *new_arg, *line;
508
353
const char whitespace_delims[] = " \r\t\f\v\n";
509
354
const char comment_delim[] = "#";
510
355
511
custom_argc = 1;
512
custom_argv = malloc(sizeof(char*) * 2);
513
if(custom_argv == NULL){
514
perror("malloc");
515
exitstatus = EXIT_FAILURE;
516
goto fallback;
517
}
518
custom_argv[0] = argv[0];
519
custom_argv[1] = NULL;
520
521
/* for each line in the config file, strip whitespace and ignore
522
commented text */
523
356
while(true){
524
357
sret = getline(&org_line, &size, conffp);
525
358
if(sret == -1){
533
366
continue;
534
367
}
535
368
new_arg = strdup(p);
536
if(new_arg == NULL){
537
perror("strdup");
538
exitstatus = EXIT_FAILURE;
539
free(org_line);
540
goto fallback;
541
}
542
543
custom_argc += 1;
544
custom_argv = realloc(custom_argv, sizeof(char *)
545
* ((unsigned int) custom_argc + 1));
546
if(custom_argv == NULL){
547
perror("realloc");
548
exitstatus = EXIT_FAILURE;
549
free(org_line);
550
goto fallback;
551
}
552
custom_argv[custom_argc-1] = new_arg;
553
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
}
554
375
}
555
376
}
556
377
free(org_line);
557
} else {
558
/* Check for harmful errors and go to fallback. Other errors might
559
not affect opening plugins */
378
} else{
379
/* check for harmfull errors */
560
380
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
561
381
perror("fopen");
562
382
exitstatus = EXIT_FAILURE;
563
goto fallback;
383
goto end;
564
384
}
565
385
}
566
/* If there was any arguments from configuration file,
567
pass them to parser as command arguments */
386
568
387
if(custom_argv != NULL){
569
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
570
0, NULL);
388
custom_argv[0] = argv[0];
389
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, &plugin_list);
571
390
if (ret == ARGP_ERR_UNKNOWN){
572
391
fprintf(stderr, "Unknown error while parsing arguments\n");
573
392
exitstatus = EXIT_FAILURE;
574
goto fallback;
393
goto end;
575
394
}
576
395
}
577
396
578
/* Parse actual command line arguments, to let them override the
579
config file */
580
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
581
if (ret == ARGP_ERR_UNKNOWN){
582
fprintf(stderr, "Unknown error while parsing arguments\n");
583
exitstatus = EXIT_FAILURE;
584
goto fallback;
585
}
586
587
397
if(debug){
588
398
for(plugin *p = plugin_list; p != NULL; p=p->next){
589
399
fprintf(stderr, "Plugin: %s has %d arguments\n",
591
401
for(char **a = p->argv; *a != NULL; a++){
592
402
fprintf(stderr, "\tArg: %s\n", *a);
593
403
}
594
fprintf(stderr, "...and %u environment variables\n", p->envc);
595
for(char **a = p->environ; *a != NULL; a++){
596
fprintf(stderr, "\t%s\n", *a);
597
}
598
404
}
599
405
}
600
406
601
/* Strip permissions down to nobody */
602
407
ret = setuid(uid);
603
408
if (ret == -1){
604
409
perror("setuid");
605
}
410
}
411
606
412
setgid(gid);
607
413
if (ret == -1){
608
414
perror("setgid");
609
415
}
610
416
611
if (plugindir == NULL){
612
dir = opendir(PDIR);
613
} else {
614
dir = opendir(plugindir);
615
}
616
417
dir = opendir(plugindir);
617
418
if(dir == NULL){
618
419
perror("Could not open plugin dir");
619
420
exitstatus = EXIT_FAILURE;
620
goto fallback;
421
goto end;
621
422
}
622
423
623
424
/* Set the FD_CLOEXEC flag on the directory, if possible */
628
429
if(ret < 0){
629
430
perror("set_cloexec_flag");
630
431
exitstatus = EXIT_FAILURE;
631
goto fallback;
432
goto end;
632
433
}
633
434
}
634
435
}
635
436
636
437
FD_ZERO(&rfds_all);
637
438
638
/* Read and execute any executable in the plugin directory*/
639
439
while(true){
640
440
dirst = readdir(dir);
641
441
642
/* All directory entries have been processed */
442
// All directory entries have been processed
643
443
if(dirst == NULL){
644
444
if (errno == EBADF){
645
445
perror("readdir");
646
446
exitstatus = EXIT_FAILURE;
647
goto fallback;
447
goto end;
648
448
}
649
449
break;
650
450
}
651
451
652
452
d_name_len = strlen(dirst->d_name);
653
453
654
/* Ignore dotfiles, backup files and other junk */
454
// Ignore dotfiles, backup files and other junk
655
455
{
656
456
bool bad_name = false;
657
457
672
472
break;
673
473
}
674
474
}
475
675
476
if(bad_name){
676
477
continue;
677
478
}
479
678
480
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
679
481
size_t suf_len = strlen(*suf);
680
482
if((d_name_len >= suf_len)
693
495
continue;
694
496
}
695
497
}
696
697
char *filename;
698
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
699
if(ret < 0){
700
perror("asprintf");
498
499
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
500
if (filename == NULL){
501
perror("malloc");
701
502
continue;
702
503
}
504
strcpy(filename, plugindir); /* Spurious warning */
505
strcat(filename, "/"); /* Spurious warning */
506
strcat(filename, dirst->d_name); /* Spurious warning */
703
507
704
508
ret = stat(filename, &st);
705
509
if (ret == -1){
707
511
free(filename);
708
512
continue;
709
513
}
710
711
/* Ignore non-executable files */
514
712
515
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
713
516
if(debug){
714
517
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
717
520
free(filename);
718
521
continue;
719
522
}
720
721
plugin *p = getplugin(dirst->d_name);
722
if(p == NULL){
723
perror("getplugin");
724
free(filename);
725
continue;
726
}
727
if(p->disabled){
523
if(getplugin(dirst->d_name, &plugin_list)->disabled){
728
524
if(debug){
729
525
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
730
526
dirst->d_name);
732
528
free(filename);
733
529
continue;
734
530
}
531
plugin *p = getplugin(dirst->d_name, &plugin_list);
735
532
{
736
533
/* Add global arguments to argument list for this plugin */
737
plugin *g = getplugin(NULL);
738
if(g != NULL){
739
for(char **a = g->argv + 1; *a != NULL; a++){
740
if(not add_argument(p, *a)){
741
perror("add_argument");
742
}
743
}
744
/* Add global environment variables */
745
for(char **e = g->environ; *e != NULL; e++){
746
if(not add_environment(p, *e, false)){
747
perror("add_environment");
748
}
749
}
750
}
751
}
752
/* If this plugin has any environment variables, we will call
753
using execve and need to duplicate the environment from this
754
process, too. */
755
if(p->environ[0] != NULL){
756
for(char **e = environ; *e != NULL; e++){
757
if(not add_environment(p, *e, false)){
758
perror("add_environment");
759
}
760
}
761
}
762
763
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];
764
540
ret = pipe(pipefd);
765
541
if (ret == -1){
766
542
perror("pipe");
767
543
exitstatus = EXIT_FAILURE;
768
goto fallback;
544
goto end;
769
545
}
770
/* Ask OS to automatic close the pipe on exec */
771
546
ret = set_cloexec_flag(pipefd[0]);
772
547
if(ret < 0){
773
548
perror("set_cloexec_flag");
774
549
exitstatus = EXIT_FAILURE;
775
goto fallback;
550
goto end;
776
551
}
777
552
ret = set_cloexec_flag(pipefd[1]);
778
553
if(ret < 0){
779
554
perror("set_cloexec_flag");
780
555
exitstatus = EXIT_FAILURE;
781
goto fallback;
556
goto end;
782
557
}
783
558
/* Block SIGCHLD until process is safely in process list */
784
559
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
785
560
if(ret < 0){
786
561
perror("sigprocmask");
787
562
exitstatus = EXIT_FAILURE;
788
goto fallback;
563
goto end;
789
564
}
790
/* Starting a new process to be watched */
565
// Starting a new process to be watched
791
566
pid_t pid = fork();
792
567
if(pid == -1){
793
568
perror("fork");
794
569
exitstatus = EXIT_FAILURE;
795
goto fallback;
570
goto end;
796
571
}
797
572
if(pid == 0){
798
573
/* this is the child process */
818
593
above and must now close it manually here. */
819
594
closedir(dir);
820
595
}
821
if(p->environ[0] == NULL){
822
if(execv(filename, p->argv) < 0){
823
perror("execv");
824
_exit(EXIT_FAILURE);
825
}
826
} else {
827
if(execve(filename, p->argv, p->environ) < 0){
828
perror("execve");
829
_exit(EXIT_FAILURE);
830
}
596
if(execv(filename, p->argv) < 0){
597
perror("execv");
598
_exit(EXIT_FAILURE);
831
599
}
832
600
/* no return */
833
601
}
834
/* Parent process */
835
close(pipefd[1]); /* Close unused write end of pipe */
602
/* parent process */
836
603
free(filename);
837
plugin *new_plugin = getplugin(dirst->d_name);
838
if (new_plugin == NULL){
839
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");
840
608
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
841
609
if(ret < 0){
842
perror("sigprocmask");
610
perror("sigprocmask");
843
611
}
844
612
exitstatus = EXIT_FAILURE;
845
goto fallback;
613
goto end;
846
614
}
847
615
848
new_plugin->pid = pid;
849
new_plugin->fd = pipefd[0];
850
616
*new_process = (struct process){ .pid = pid,
617
.fd = pipefd[0],
618
.next = process_list };
619
// List handling
620
process_list = new_process;
851
621
/* Unblock SIGCHLD so signal handler can be run if this process
852
622
has already completed */
853
623
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
854
624
if(ret < 0){
855
625
perror("sigprocmask");
856
626
exitstatus = EXIT_FAILURE;
857
goto fallback;
858
}
859
860
FD_SET(new_plugin->fd, &rfds_all);
861
862
if (maxfd < new_plugin->fd){
863
maxfd = new_plugin->fd;
864
}
865
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);
866
643
}
867
644
868
645
closedir(dir);
869
646
dir = NULL;
870
871
for(plugin *p = plugin_list; p != NULL; p = p->next){
872
if(p->pid != 0){
873
break;
874
}
875
if(p->next == NULL){
876
fprintf(stderr, "No plugin processes started. Incorrect plugin"
877
" directory?\n");
878
free_plugin_list();
879
}
647
648
if (process_list == NULL){
649
fprintf(stderr, "No plugin processes started. Incorrect plugin"
650
" directory?\n");
651
process_list = NULL;
880
652
}
881
882
/* Main loop while running plugins exist */
883
while(plugin_list){
653
while(process_list){
884
654
fd_set rfds = rfds_all;
885
655
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
886
656
if (select_ret == -1){
887
657
perror("select");
888
658
exitstatus = EXIT_FAILURE;
889
goto fallback;
659
goto end;
890
660
}
891
661
/* OK, now either a process completed, or something can be read
892
662
from one of them */
893
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
663
for(process *proc = process_list; proc ; proc = proc->next){
894
664
/* Is this process completely done? */
895
665
if(proc->eof and proc->completed){
896
666
/* Only accept the plugin output if it exited cleanly */
897
667
if(not WIFEXITED(proc->status)
898
668
or WEXITSTATUS(proc->status) != 0){
899
669
/* Bad exit by plugin */
900
901
670
if(debug){
902
671
if(WIFEXITED(proc->status)){
903
672
fprintf(stderr, "Plugin %u exited with status %d\n",
912
681
(unsigned int) (proc->pid));
913
682
}
914
683
}
915
916
684
/* Remove the plugin */
917
685
FD_CLR(proc->fd, &rfds_all);
918
919
686
/* Block signal while modifying process_list */
920
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
687
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
921
688
if(ret < 0){
922
689
perror("sigprocmask");
923
690
exitstatus = EXIT_FAILURE;
924
goto fallback;
925
}
926
free_plugin(proc);
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
}
927
706
/* We are done modifying process list, so unblock signal */
928
707
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
929
708
NULL);
930
709
if(ret < 0){
931
710
perror("sigprocmask");
932
exitstatus = EXIT_FAILURE;
933
goto fallback;
934
}
935
936
if(plugin_list == NULL){
937
break;
938
}
939
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;
940
718
}
941
942
719
/* This process exited nicely, so print its buffer */
943
720
944
bool bret = print_out_password(proc->buffer,
945
proc->buffer_length);
721
bool bret = print_out_password(proc->buffer, proc->buffer_length);
946
722
if(not bret){
947
723
perror("print_out_password");
948
724
exitstatus = EXIT_FAILURE;
949
725
}
950
goto fallback;
726
goto end;
951
727
}
952
953
728
/* This process has not completed. Does it have any output? */
954
729
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
955
730
/* This process had nothing to say at this time */
962
737
if (proc->buffer == NULL){
963
738
perror("malloc");
964
739
exitstatus = EXIT_FAILURE;
965
goto fallback;
740
goto end;
966
741
}
967
742
proc->buffer_size += BUFFER_SIZE;
968
743
}
983
758
}
984
759
985
760
986
fallback:
761
end:
987
762
988
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
989
/* Fallback if all plugins failed, none are found or an error
990
occured */
763
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
764
/* Fallback if all plugins failed, none are found or an error occured */
991
765
bool bret;
992
766
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
993
767
char *passwordbuffer = getpass("Password: ");
995
769
if(not bret){
996
770
perror("print_out_password");
997
771
exitstatus = EXIT_FAILURE;
772
goto end;
998
773
}
999
774
}
1000
775
1001
776
/* Restore old signal handler */
1002
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1003
if(ret == -1){
1004
perror("sigaction");
1005
exitstatus = EXIT_FAILURE;
1006
}
1007
1008
if(custom_argv != NULL){
1009
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1010
free(*arg);
1011
}
1012
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);
1013
786
}
1014
787
1015
788
if(dir != NULL){
1017
790
}
1018
791
1019
792
/* Free the process list and kill the processes */
1020
for(plugin *p = plugin_list; p != NULL; p = p->next){
1021
if(p->pid != 0){
1022
close(p->fd);
1023
ret = kill(p->pid, SIGTERM);
1024
if(ret == -1 and errno != ESRCH){
1025
/* Set-uid proccesses might not get closed */
1026
perror("kill");
1027
}
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");
1028
800
}
801
free(process_list->buffer);
802
free(process_list);
1029
803
}
1030
804
1031
805
/* Wait for any remaining child processes to terminate */
1035
809
if(errno != ECHILD){
1036
810
perror("wait");
1037
811
}
1038
1039
free_plugin_list();
1040
1041
free(plugindir);
1042
free(argfile);
1043
812
1044
813
return exitstatus;
1045
814
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0