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- Committer: Teddy Hogeborn
- Date: 2008-09-05 18:37:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080905183728-l0m8v3vqa302uwrw
* mandos (main): Use EAFP with pidfile.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
plugin-runner.c
21
21
* Contact the authors at <mandos@fukt.bsnet.se>.
22
22
*/
23
23
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
26
#include <stdio.h> /* popen(), fileno(), fprintf(),
27
stderr, STDOUT_FILENO */
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
25
asprintf() */
26
#include <stddef.h> /* size_t, NULL */
27
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
EXIT_SUCCESS, realloc() */
29
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
32
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
stat, waitpid(), WIFEXITED(),
34
WEXITSTATUS(), wait(), pid_t,
35
uid_t, gid_t, getuid(), getgid(),
36
dirfd() */
37
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
38
FD_SET(), FD_ISSET(), FD_CLR */
39
#include <sys/wait.h> /* wait(), waitpid(), WIFEXITED(),
40
WEXITSTATUS() */
41
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
28
42
#include <iso646.h> /* and, or, not */
29
#include <sys/types.h> /* DIR, opendir(), stat(),
30
struct stat, waitpid(),
31
WIFEXITED(), WEXITSTATUS(),
32
wait() */
33
#include <sys/wait.h> /* wait() */
34
43
#include <dirent.h> /* DIR, struct dirent, opendir(),
35
readdir(), closedir() */
36
#include <sys/stat.h> /* struct stat, stat(), S_ISREG() */
44
readdir(), closedir(), dirfd() */
37
45
#include <unistd.h> /* struct stat, stat(), S_ISREG(),
38
fcntl() */
39
#include <fcntl.h> /* fcntl() */
40
#include <stddef.h> /* NULL */
41
#include <stdlib.h> /* EXIT_FAILURE */
42
#include <sys/select.h> /* fd_set, select(), FD_ZERO(),
43
FD_SET(), FD_ISSET() */
44
#include <string.h> /* strlen(), strcpy(), strcat() */
45
#include <stdbool.h> /* true */
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
47
WEXITSTATUS() */
46
fcntl(), setuid(), setgid(),
47
F_GETFD, F_SETFD, FD_CLOEXEC,
48
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
execv(), write(), read(),
51
close() */
52
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
FD_CLOEXEC */
54
#include <string.h> /* strsep, strlen(), asprintf() */
48
55
#include <errno.h> /* errno */
49
#include <argp.h> /* struct argp_option,
50
struct argp_state, struct argp,
51
argp_parse() */
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), ARGP_ERR_UNKNOWN,
59
ARGP_KEY_END, ARGP_KEY_ARG,
60
error_t */
61
#include <signal.h> /* struct sigaction, sigemptyset(),
62
sigaddset(), sigaction(),
63
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
SIG_UNBLOCK, kill() */
65
#include <errno.h> /* errno, EBADF */
52
66
53
67
#define BUFFER_SIZE 256
54
68
55
struct process;
56
57
typedef struct process{
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";
73
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
74
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*/
58
86
pid_t pid;
59
87
int fd;
60
88
char *buffer;
61
89
size_t buffer_size;
62
90
size_t buffer_length;
63
91
bool eof;
64
bool completed;
65
int status;
66
struct process *next;
67
} process;
68
69
typedef struct plugin{
70
char *name; /* can be NULL or any plugin name */
71
char **argv;
72
int argc;
73
bool disabled;
92
volatile bool completed;
93
volatile int status;
74
94
struct plugin *next;
75
95
} plugin;
76
96
77
static plugin *getplugin(char *name, plugin **plugin_list){
78
for (plugin *p = *plugin_list; p != NULL; p = p->next){
97
static plugin *plugin_list = NULL;
98
99
/* Gets an existing plugin based on name,
100
or if none is found, creates a new one */
101
static plugin *getplugin(char *name){
102
/* Check for exiting plugin with that name */
103
for (plugin *p = plugin_list; p != NULL; p = p->next){
79
104
if ((p->name == name)
80
105
or (p->name and name and (strcmp(p->name, name) == 0))){
81
106
return p;
84
109
/* Create a new plugin */
85
110
plugin *new_plugin = malloc(sizeof(plugin));
86
111
if (new_plugin == NULL){
87
perror("malloc");
88
exit(EXIT_FAILURE);
89
}
90
new_plugin->name = name;
112
return NULL;
113
}
114
char *copy_name = NULL;
115
if(name != NULL){
116
copy_name = strdup(name);
117
if(copy_name == NULL){
118
return NULL;
119
}
120
}
121
122
*new_plugin = (plugin) { .name = copy_name,
123
.argc = 1,
124
.disabled = false,
125
.next = plugin_list };
126
91
127
new_plugin->argv = malloc(sizeof(char *) * 2);
92
128
if (new_plugin->argv == NULL){
93
perror("malloc");
94
exit(EXIT_FAILURE);
129
free(copy_name);
130
free(new_plugin);
131
return NULL;
95
132
}
96
new_plugin->argv[0] = name;
133
new_plugin->argv[0] = copy_name;
97
134
new_plugin->argv[1] = NULL;
98
new_plugin->argc = 1;
99
new_plugin->disabled = false;
100
new_plugin->next = *plugin_list;
135
136
new_plugin->environ = malloc(sizeof(char *));
137
if(new_plugin->environ == NULL){
138
free(copy_name);
139
free(new_plugin->argv);
140
free(new_plugin);
141
return NULL;
142
}
143
new_plugin->environ[0] = NULL;
144
101
145
/* Append the new plugin to the list */
102
*plugin_list = new_plugin;
146
plugin_list = new_plugin;
103
147
return new_plugin;
104
148
}
105
149
106
static void addargument(plugin *p, char *arg){
107
p->argv[p->argc] = arg;
108
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
109
if (p->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
112
}
113
p->argc++;
114
p->argv[p->argc] = NULL;
150
/* Helper function for add_argument and add_environment */
151
static bool add_to_char_array(const char *new, char ***array,
152
int *len){
153
/* Resize the pointed-to array to hold one more pointer */
154
*array = realloc(*array, sizeof(char *)
155
* (size_t) ((*len) + 2));
156
/* Malloc check */
157
if(*array == NULL){
158
return false;
159
}
160
/* Make a copy of the new string */
161
char *copy = strdup(new);
162
if(copy == NULL){
163
return false;
164
}
165
/* Insert the copy */
166
(*array)[*len] = copy;
167
(*len)++;
168
/* Add a new terminating NULL pointer to the last element */
169
(*array)[*len] = NULL;
170
return true;
171
}
172
173
/* Add to a plugin's argument vector */
174
static bool add_argument(plugin *p, const char *arg){
175
if(p == NULL){
176
return false;
177
}
178
return add_to_char_array(arg, &(p->argv), &(p->argc));
179
}
180
181
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def, bool replace){
183
if(p == NULL){
184
return false;
185
}
186
/* namelen = length of name of environment variable */
187
size_t namelen = (size_t)(strchrnul(def, '=') - def);
188
/* Search for this environment variable */
189
for(char **e = p->environ; *e != NULL; e++){
190
if(strncmp(*e, def, namelen + 1) == 0){
191
/* It already exists */
192
if(replace){
193
char *new = realloc(*e, strlen(def) + 1);
194
if(new == NULL){
195
return false;
196
}
197
*e = new;
198
strcpy(*e, def);
199
}
200
return true;
201
}
202
}
203
return add_to_char_array(def, &(p->environ), &(p->envc));
115
204
}
116
205
117
206
/*
130
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
131
220
}
132
221
133
const char *argp_program_version = "plugbasedclient 0.9";
134
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
135
136
process *process_list = NULL;
137
138
/* Mark a process as completed when it exits, and save its exit
222
223
/* Mark processes as completed when they exit, and save their exit
139
224
status. */
140
225
void handle_sigchld(__attribute__((unused)) int sig){
141
process *proc = process_list;
142
int status;
143
pid_t pid = wait(&status);
144
while(proc != NULL and proc->pid != pid){
145
proc = proc->next;
146
}
147
if(proc == NULL){
148
/* Process not found in process list */
149
return;
150
}
151
proc->status = status;
152
proc->completed = true;
226
while(true){
227
plugin *proc = plugin_list;
228
int status;
229
pid_t pid = waitpid(-1, &status, WNOHANG);
230
if(pid == 0){
231
/* Only still running child processes */
232
break;
233
}
234
if(pid == -1){
235
if (errno != ECHILD){
236
perror("waitpid");
237
}
238
/* No child processes */
239
break;
240
}
241
242
/* A child exited, find it in process_list */
243
while(proc != NULL and proc->pid != pid){
244
proc = proc->next;
245
}
246
if(proc == NULL){
247
/* Process not found in process list */
248
continue;
249
}
250
proc->status = status;
251
proc->completed = true;
252
}
253
}
254
255
/* Prints out a password to stdout */
256
bool print_out_password(const char *buffer, size_t length){
257
ssize_t ret;
258
if(length>0 and buffer[length-1] == '\n'){
259
length--;
260
}
261
for(size_t written = 0; written < length; written += (size_t)ret){
262
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
263
length - written));
264
if(ret < 0){
265
return false;
266
}
267
}
268
return true;
269
}
270
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);
283
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
}
295
}
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
}
153
305
}
154
306
155
307
int main(int argc, char *argv[]){
156
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
308
char *plugindir = NULL;
309
char *argfile = NULL;
310
FILE *conffp;
157
311
size_t d_name_len;
158
312
DIR *dir = NULL;
159
313
struct dirent *dirst;
167
321
struct sigaction old_sigchld_action;
168
322
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
169
323
.sa_flags = SA_NOCLDSTOP };
170
char *plus_options = NULL;
171
char **plus_argv = NULL;
324
char **custom_argv = NULL;
325
int custom_argc = 0;
172
326
173
327
/* Establish a signal handler */
174
328
sigemptyset(&sigchld_action.sa_mask);
175
329
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
176
if(ret < 0){
330
if(ret == -1){
177
331
perror("sigaddset");
178
exit(EXIT_FAILURE);
332
exitstatus = EXIT_FAILURE;
333
goto fallback;
179
334
}
180
335
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
181
if(ret < 0){
336
if(ret == -1){
182
337
perror("sigaction");
183
exit(EXIT_FAILURE);
338
exitstatus = EXIT_FAILURE;
339
goto fallback;
184
340
}
185
341
186
342
/* The options we understand. */
188
344
{ .name = "global-options", .key = 'g',
189
345
.arg = "OPTION[,OPTION[,...]]",
190
346
.doc = "Options passed to all plugins" },
347
{ .name = "global-env", .key = 'G',
348
.arg = "VAR=value",
349
.doc = "Environment variable passed to all plugins" },
191
350
{ .name = "options-for", .key = 'o',
192
351
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
193
352
.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" },
194
356
{ .name = "disable", .key = 'd',
195
357
.arg = "PLUGIN",
196
358
.doc = "Disable a specific plugin", .group = 1 },
359
{ .name = "enable", .key = 'e',
360
.arg = "PLUGIN",
361
.doc = "Enable a specific plugin", .group = 1 },
197
362
{ .name = "plugin-dir", .key = 128,
198
363
.arg = "DIRECTORY",
199
364
.doc = "Specify a different plugin directory", .group = 2 },
200
{ .name = "userid", .key = 129,
201
.arg = "ID", .flags = 0,
202
.doc = "User ID the plugins will run as", .group = 2 },
203
{ .name = "groupid", .key = 130,
204
.arg = "ID", .flags = 0,
205
.doc = "Group ID the plugins will run as", .group = 2 },
206
{ .name = "debug", .key = 131,
207
.doc = "Debug mode", .group = 3 },
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 },
208
376
{ .name = NULL }
209
377
};
210
378
211
error_t parse_opt (int key, char *arg, struct argp_state *state) {
212
/* Get the INPUT argument from `argp_parse', which we know is a
213
pointer to our plugin list pointer. */
214
plugin **plugins = state->input;
379
error_t parse_opt (int key, char *arg, __attribute__((unused))
380
struct argp_state *state) {
215
381
switch (key) {
216
case 'g':
217
if (arg != NULL){
218
char *p = strtok(arg, ",");
219
do{
220
addargument(getplugin(NULL, plugins), p);
221
p = strtok(NULL, ",");
222
} while (p != NULL);
223
}
224
break;
225
case 'o':
226
if (arg != NULL){
227
char *name = strtok(arg, ":");
228
char *p = strtok(NULL, ":");
229
if(p != NULL){
230
p = strtok(p, ",");
231
do{
232
addargument(getplugin(name, plugins), p);
233
p = strtok(NULL, ",");
234
} while (p != NULL);
235
}
236
}
237
break;
238
case 'd':
239
if (arg != NULL){
240
getplugin(arg, plugins)->disabled = true;
241
}
242
break;
243
case 128:
244
plugindir = arg;
245
break;
246
case 129:
382
case 'g': /* --global-options */
383
if (arg != NULL){
384
char *p;
385
while((p = strsep(&arg, ",")) != NULL){
386
if(p[0] == '\0'){
387
continue;
388
}
389
if(not add_argument(getplugin(NULL), p)){
390
perror("add_argument");
391
return ARGP_ERR_UNKNOWN;
392
}
393
}
394
}
395
break;
396
case 'G': /* --global-env */
397
if(arg == NULL){
398
break;
399
}
400
{
401
char *envdef = strdup(arg);
402
if(envdef == NULL){
403
break;
404
}
405
if(not add_environment(getplugin(NULL), envdef, true)){
406
perror("add_environment");
407
}
408
}
409
break;
410
case 'o': /* --options-for */
411
if (arg != NULL){
412
char *p_name = strsep(&arg, ":");
413
if(p_name[0] == '\0' or arg == NULL){
414
break;
415
}
416
char *opt = strsep(&arg, ":");
417
if(opt[0] == '\0' or opt == NULL){
418
break;
419
}
420
char *p;
421
while((p = strsep(&opt, ",")) != NULL){
422
if(p[0] == '\0'){
423
continue;
424
}
425
if(not add_argument(getplugin(p_name), p)){
426
perror("add_argument");
427
return ARGP_ERR_UNKNOWN;
428
}
429
}
430
}
431
break;
432
case 'E': /* --env-for */
433
if(arg == NULL){
434
break;
435
}
436
{
437
char *envdef = strchr(arg, ':');
438
if(envdef == NULL){
439
break;
440
}
441
char *p_name = strndup(arg, (size_t) (envdef-arg));
442
if(p_name == NULL){
443
break;
444
}
445
envdef++;
446
if(not add_environment(getplugin(p_name), envdef, true)){
447
perror("add_environment");
448
}
449
}
450
break;
451
case 'd': /* --disable */
452
if (arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = true;
458
}
459
break;
460
case 'e': /* --enable */
461
if (arg != NULL){
462
plugin *p = getplugin(arg);
463
if(p == NULL){
464
return ARGP_ERR_UNKNOWN;
465
}
466
p->disabled = false;
467
}
468
break;
469
case 128: /* --plugin-dir */
470
plugindir = strdup(arg);
471
if(plugindir == NULL){
472
perror("strdup");
473
}
474
break;
475
case 129: /* --config-file */
476
/* This is already done by parse_opt_config_file() */
477
break;
478
case 130: /* --userid */
247
479
uid = (uid_t)strtol(arg, NULL, 10);
248
480
break;
249
case 130:
481
case 131: /* --groupid */
250
482
gid = (gid_t)strtol(arg, NULL, 10);
251
483
break;
252
case 131:
484
case 132: /* --debug */
253
485
debug = true;
254
486
break;
255
487
case ARGP_KEY_ARG:
256
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
257
argp_usage (state);
488
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
489
break;
490
case ARGP_KEY_END:
491
break;
492
default:
493
return ARGP_ERR_UNKNOWN;
494
}
495
return 0;
496
}
497
498
/* This option parser is the same as parse_opt() above, except it
499
ignores everything but the --config-file option. */
500
error_t parse_opt_config_file (int key, char *arg,
501
__attribute__((unused))
502
struct argp_state *state) {
503
switch (key) {
504
case 'g': /* --global-options */
505
case 'G': /* --global-env */
506
case 'o': /* --options-for */
507
case 'E': /* --env-for */
508
case 'd': /* --disable */
509
case 'e': /* --enable */
510
case 128: /* --plugin-dir */
511
break;
512
case 129: /* --config-file */
513
argfile = strdup(arg);
514
if(argfile == NULL){
515
perror("strdup");
258
516
}
259
plus_options = arg;
260
break;
517
break;
518
case 130: /* --userid */
519
case 131: /* --groupid */
520
case 132: /* --debug */
521
case ARGP_KEY_ARG:
261
522
case ARGP_KEY_END:
262
523
break;
263
524
default:
266
527
return 0;
267
528
}
268
529
269
plugin *plugin_list = NULL;
270
271
struct argp argp = { .options = options, .parser = parse_opt,
272
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
530
struct argp argp = { .options = options,
531
.parser = parse_opt_config_file,
532
.args_doc = "",
273
533
.doc = "Mandos plugin runner -- Run plugins" };
274
534
275
argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
276
277
if(plus_options){
278
/* This is a mangled argument in the form of
279
"+--option+--other-option=parameter+--yet-another-option", etc */
280
/* Make new argc and argv vars, and call argp_parse() again. */
281
plus_options++; /* skip the first '+' character */
282
const char delims[] = "+";
283
char *arg;
284
int new_argc = 1;
285
plus_argv = malloc(sizeof(char*) * 2);
286
if(plus_argv == NULL){
535
/* Parse using the parse_opt_config_file in order to get the custom
536
config file location, if any. */
537
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
538
if (ret == ARGP_ERR_UNKNOWN){
539
fprintf(stderr, "Unknown error while parsing arguments\n");
540
exitstatus = EXIT_FAILURE;
541
goto fallback;
542
}
543
544
/* Reset to the normal argument parser */
545
argp.parser = parse_opt;
546
547
/* Open the configfile if available */
548
if (argfile == NULL){
549
conffp = fopen(AFILE, "r");
550
} else {
551
conffp = fopen(argfile, "r");
552
}
553
if(conffp != NULL){
554
char *org_line = NULL;
555
char *p, *arg, *new_arg, *line;
556
size_t size = 0;
557
ssize_t sret;
558
const char whitespace_delims[] = " \r\t\f\v\n";
559
const char comment_delim[] = "#";
560
561
custom_argc = 1;
562
custom_argv = malloc(sizeof(char*) * 2);
563
if(custom_argv == NULL){
287
564
perror("malloc");
288
565
exitstatus = EXIT_FAILURE;
289
goto end;
290
}
291
plus_argv[0] = argv[0];
292
plus_argv[1] = NULL;
293
arg = strtok(plus_options, delims); /* Get first argument */
294
while(arg != NULL){
295
new_argc++;
296
plus_argv = realloc(plus_argv, sizeof(char *)
297
* ((unsigned int) new_argc + 1));
298
if(plus_argv == NULL){
299
perror("malloc");
300
exitstatus = EXIT_FAILURE;
301
goto end;
302
}
303
plus_argv[new_argc-1] = arg;
304
plus_argv[new_argc] = NULL;
305
arg = strtok(NULL, delims); /* Get next argument */
306
}
307
argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
566
goto fallback;
567
}
568
custom_argv[0] = argv[0];
569
custom_argv[1] = NULL;
570
571
/* for each line in the config file, strip whitespace and ignore
572
commented text */
573
while(true){
574
sret = getline(&org_line, &size, conffp);
575
if(sret == -1){
576
break;
577
}
578
579
line = org_line;
580
arg = strsep(&line, comment_delim);
581
while((p = strsep(&arg, whitespace_delims)) != NULL){
582
if(p[0] == '\0'){
583
continue;
584
}
585
new_arg = strdup(p);
586
if(new_arg == NULL){
587
perror("strdup");
588
exitstatus = EXIT_FAILURE;
589
free(org_line);
590
goto fallback;
591
}
592
593
custom_argc += 1;
594
custom_argv = realloc(custom_argv, sizeof(char *)
595
* ((unsigned int) custom_argc + 1));
596
if(custom_argv == NULL){
597
perror("realloc");
598
exitstatus = EXIT_FAILURE;
599
free(org_line);
600
goto fallback;
601
}
602
custom_argv[custom_argc-1] = new_arg;
603
custom_argv[custom_argc] = NULL;
604
}
605
}
606
free(org_line);
607
} else {
608
/* Check for harmful errors and go to fallback. Other errors might
609
not affect opening plugins */
610
if (errno == EMFILE or errno == ENFILE or errno == ENOMEM){
611
perror("fopen");
612
exitstatus = EXIT_FAILURE;
613
goto fallback;
614
}
615
}
616
/* If there was any arguments from configuration file,
617
pass them to parser as command arguments */
618
if(custom_argv != NULL){
619
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
620
0, NULL);
621
if (ret == ARGP_ERR_UNKNOWN){
622
fprintf(stderr, "Unknown error while parsing arguments\n");
623
exitstatus = EXIT_FAILURE;
624
goto fallback;
625
}
626
}
627
628
/* Parse actual command line arguments, to let them override the
629
config file */
630
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
631
if (ret == ARGP_ERR_UNKNOWN){
632
fprintf(stderr, "Unknown error while parsing arguments\n");
633
exitstatus = EXIT_FAILURE;
634
goto fallback;
308
635
}
309
636
310
637
if(debug){
314
641
for(char **a = p->argv; *a != NULL; a++){
315
642
fprintf(stderr, "\tArg: %s\n", *a);
316
643
}
644
fprintf(stderr, "...and %u environment variables\n", p->envc);
645
for(char **a = p->environ; *a != NULL; a++){
646
fprintf(stderr, "\t%s\n", *a);
647
}
317
648
}
318
649
}
319
650
651
/* Strip permissions down to nobody */
320
652
ret = setuid(uid);
321
653
if (ret == -1){
322
654
perror("setuid");
323
}
324
655
}
325
656
setgid(gid);
326
657
if (ret == -1){
327
658
perror("setgid");
328
659
}
329
660
330
dir = opendir(plugindir);
661
if (plugindir == NULL){
662
dir = opendir(PDIR);
663
} else {
664
dir = opendir(plugindir);
665
}
666
331
667
if(dir == NULL){
332
668
perror("Could not open plugin dir");
333
669
exitstatus = EXIT_FAILURE;
334
goto end;
670
goto fallback;
335
671
}
336
672
337
673
/* Set the FD_CLOEXEC flag on the directory, if possible */
342
678
if(ret < 0){
343
679
perror("set_cloexec_flag");
344
680
exitstatus = EXIT_FAILURE;
345
goto end;
681
goto fallback;
346
682
}
347
683
}
348
684
}
349
685
350
686
FD_ZERO(&rfds_all);
351
687
688
/* Read and execute any executable in the plugin directory*/
352
689
while(true){
353
690
dirst = readdir(dir);
354
691
355
// All directory entries have been processed
692
/* All directory entries have been processed */
356
693
if(dirst == NULL){
694
if (errno == EBADF){
695
perror("readdir");
696
exitstatus = EXIT_FAILURE;
697
goto fallback;
698
}
357
699
break;
358
700
}
359
701
360
702
d_name_len = strlen(dirst->d_name);
361
703
362
// Ignore dotfiles, backup files and other junk
704
/* Ignore dotfiles, backup files and other junk */
363
705
{
364
706
bool bad_name = false;
365
707
380
722
break;
381
723
}
382
724
}
383
384
725
if(bad_name){
385
726
continue;
386
727
}
387
388
728
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
389
729
size_t suf_len = strlen(*suf);
390
730
if((d_name_len >= suf_len)
403
743
continue;
404
744
}
405
745
}
406
407
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
408
if (filename == NULL){
409
perror("malloc");
410
exitstatus = EXIT_FAILURE;
411
goto end;
412
}
413
strcpy(filename, plugindir); /* Spurious warning */
414
strcat(filename, "/"); /* Spurious warning */
415
strcat(filename, dirst->d_name); /* Spurious warning */
416
417
stat(filename, &st);
418
746
747
char *filename;
748
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
749
if(ret < 0){
750
perror("asprintf");
751
continue;
752
}
753
754
ret = stat(filename, &st);
755
if (ret == -1){
756
perror("stat");
757
free(filename);
758
continue;
759
}
760
761
/* Ignore non-executable files */
419
762
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
420
763
if(debug){
421
764
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
424
767
free(filename);
425
768
continue;
426
769
}
427
if(getplugin(dirst->d_name, &plugin_list)->disabled){
770
771
plugin *p = getplugin(dirst->d_name);
772
if(p == NULL){
773
perror("getplugin");
774
free(filename);
775
continue;
776
}
777
if(p->disabled){
428
778
if(debug){
429
779
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
430
780
dirst->d_name);
432
782
free(filename);
433
783
continue;
434
784
}
435
plugin *p = getplugin(dirst->d_name, &plugin_list);
436
785
{
437
786
/* Add global arguments to argument list for this plugin */
438
plugin *g = getplugin(NULL, &plugin_list);
439
for(char **a = g->argv + 1; *a != NULL; a++){
440
addargument(p, *a);
441
}
442
}
443
int pipefd[2];
787
plugin *g = getplugin(NULL);
788
if(g != NULL){
789
for(char **a = g->argv + 1; *a != NULL; a++){
790
if(not add_argument(p, *a)){
791
perror("add_argument");
792
}
793
}
794
/* Add global environment variables */
795
for(char **e = g->environ; *e != NULL; e++){
796
if(not add_environment(p, *e, false)){
797
perror("add_environment");
798
}
799
}
800
}
801
}
802
/* If this plugin has any environment variables, we will call
803
using execve and need to duplicate the environment from this
804
process, too. */
805
if(p->environ[0] != NULL){
806
for(char **e = environ; *e != NULL; e++){
807
if(not add_environment(p, *e, false)){
808
perror("add_environment");
809
}
810
}
811
}
812
813
int pipefd[2];
444
814
ret = pipe(pipefd);
445
815
if (ret == -1){
446
816
perror("pipe");
447
817
exitstatus = EXIT_FAILURE;
448
goto end;
818
goto fallback;
449
819
}
820
/* Ask OS to automatic close the pipe on exec */
450
821
ret = set_cloexec_flag(pipefd[0]);
451
822
if(ret < 0){
452
823
perror("set_cloexec_flag");
453
824
exitstatus = EXIT_FAILURE;
454
goto end;
825
goto fallback;
455
826
}
456
827
ret = set_cloexec_flag(pipefd[1]);
457
828
if(ret < 0){
458
829
perror("set_cloexec_flag");
459
830
exitstatus = EXIT_FAILURE;
460
goto end;
831
goto fallback;
461
832
}
462
833
/* Block SIGCHLD until process is safely in process list */
463
834
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
464
835
if(ret < 0){
465
836
perror("sigprocmask");
466
837
exitstatus = EXIT_FAILURE;
467
goto end;
838
goto fallback;
468
839
}
469
// Starting a new process to be watched
840
/* Starting a new process to be watched */
470
841
pid_t pid = fork();
842
if(pid == -1){
843
perror("fork");
844
exitstatus = EXIT_FAILURE;
845
goto fallback;
846
}
471
847
if(pid == 0){
472
848
/* this is the child process */
473
849
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
480
856
perror("sigprocmask");
481
857
_exit(EXIT_FAILURE);
482
858
}
483
dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
859
860
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
861
if(ret == -1){
862
perror("dup2");
863
_exit(EXIT_FAILURE);
864
}
484
865
485
866
if(dirfd(dir) < 0){
486
867
/* If dir has no file descriptor, we could not set FD_CLOEXEC
487
868
above and must now close it manually here. */
488
869
closedir(dir);
489
870
}
490
if(execv(filename, p->argv) < 0){
491
perror("execv");
492
_exit(EXIT_FAILURE);
871
if(p->environ[0] == NULL){
872
if(execv(filename, p->argv) < 0){
873
perror("execv");
874
_exit(EXIT_FAILURE);
875
}
876
} else {
877
if(execve(filename, p->argv, p->environ) < 0){
878
perror("execve");
879
_exit(EXIT_FAILURE);
880
}
493
881
}
494
882
/* no return */
495
883
}
496
/* parent process */
884
/* Parent process */
885
close(pipefd[1]); /* Close unused write end of pipe */
497
886
free(filename);
498
close(pipefd[1]); /* close unused write end of pipe */
499
process *new_process = malloc(sizeof(process));
500
if (new_process == NULL){
501
perror("malloc");
887
plugin *new_plugin = getplugin(dirst->d_name);
888
if (new_plugin == NULL){
889
perror("getplugin");
502
890
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
503
891
if(ret < 0){
504
perror("sigprocmask");
892
perror("sigprocmask");
505
893
}
506
894
exitstatus = EXIT_FAILURE;
507
goto end;
895
goto fallback;
508
896
}
509
897
510
*new_process = (struct process){ .pid = pid,
511
.fd = pipefd[0],
512
.next = process_list };
513
// List handling
514
process_list = new_process;
898
new_plugin->pid = pid;
899
new_plugin->fd = pipefd[0];
900
515
901
/* Unblock SIGCHLD so signal handler can be run if this process
516
902
has already completed */
517
903
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
518
904
if(ret < 0){
519
905
perror("sigprocmask");
520
906
exitstatus = EXIT_FAILURE;
521
goto end;
522
}
523
524
FD_SET(new_process->fd, &rfds_all);
525
526
if (maxfd < new_process->fd){
527
maxfd = new_process->fd;
528
}
529
530
}
531
532
/* Free the plugin list */
533
for(plugin *next; plugin_list != NULL; plugin_list = next){
534
next = plugin_list->next;
535
free(plugin_list->argv);
536
free(plugin_list);
907
goto fallback;
908
}
909
910
FD_SET(new_plugin->fd, &rfds_all);
911
912
if (maxfd < new_plugin->fd){
913
maxfd = new_plugin->fd;
914
}
915
537
916
}
538
917
539
918
closedir(dir);
540
919
dir = NULL;
541
542
if (process_list == NULL){
543
fprintf(stderr, "No plugin processes started, exiting\n");
544
exitstatus = EXIT_FAILURE;
545
goto end;
920
921
for(plugin *p = plugin_list; p != NULL; p = p->next){
922
if(p->pid != 0){
923
break;
924
}
925
if(p->next == NULL){
926
fprintf(stderr, "No plugin processes started. Incorrect plugin"
927
" directory?\n");
928
free_plugin_list();
929
}
546
930
}
547
while(process_list){
931
932
/* Main loop while running plugins exist */
933
while(plugin_list){
548
934
fd_set rfds = rfds_all;
549
935
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
550
936
if (select_ret == -1){
551
937
perror("select");
552
938
exitstatus = EXIT_FAILURE;
553
goto end;
939
goto fallback;
554
940
}
555
941
/* OK, now either a process completed, or something can be read
556
942
from one of them */
557
for(process *proc = process_list; proc ; proc = proc->next){
943
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
558
944
/* Is this process completely done? */
559
945
if(proc->eof and proc->completed){
560
946
/* Only accept the plugin output if it exited cleanly */
561
947
if(not WIFEXITED(proc->status)
562
948
or WEXITSTATUS(proc->status) != 0){
563
949
/* Bad exit by plugin */
950
564
951
if(debug){
565
952
if(WIFEXITED(proc->status)){
566
fprintf(stderr, "Plugin %d exited with status %d\n",
567
proc->pid, WEXITSTATUS(proc->status));
953
fprintf(stderr, "Plugin %u exited with status %d\n",
954
(unsigned int) (proc->pid),
955
WEXITSTATUS(proc->status));
568
956
} else if(WIFSIGNALED(proc->status)) {
569
fprintf(stderr, "Plugin %d killed by signal %d\n",
570
proc->pid, WTERMSIG(proc->status));
957
fprintf(stderr, "Plugin %u killed by signal %d\n",
958
(unsigned int) (proc->pid),
959
WTERMSIG(proc->status));
571
960
} else if(WCOREDUMP(proc->status)){
572
fprintf(stderr, "Plugin %d dumped core\n", proc->pid);
961
fprintf(stderr, "Plugin %d dumped core\n",
962
(unsigned int) (proc->pid));
573
963
}
574
964
}
965
575
966
/* Remove the plugin */
576
967
FD_CLR(proc->fd, &rfds_all);
968
577
969
/* Block signal while modifying process_list */
578
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
970
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
579
971
if(ret < 0){
580
972
perror("sigprocmask");
581
973
exitstatus = EXIT_FAILURE;
582
goto end;
583
}
584
/* Delete this process entry from the list */
585
if(process_list == proc){
586
/* First one - simple */
587
process_list = proc->next;
588
} else {
589
/* Second one or later */
590
for(process *p = process_list; p != NULL; p = p->next){
591
if(p->next == proc){
592
p->next = proc->next;
593
break;
594
}
595
}
596
}
974
goto fallback;
975
}
976
free_plugin(proc);
597
977
/* We are done modifying process list, so unblock signal */
598
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
599
979
NULL);
600
980
if(ret < 0){
601
981
perror("sigprocmask");
602
}
603
free(proc->buffer);
604
free(proc);
605
/* We deleted this process from the list, so we can't go
606
proc->next. Therefore, start over from the beginning of
607
the process list */
608
break;
982
exitstatus = EXIT_FAILURE;
983
goto fallback;
984
}
985
986
if(plugin_list == NULL){
987
break;
988
}
989
continue;
609
990
}
991
610
992
/* This process exited nicely, so print its buffer */
611
for(size_t written = 0; written < proc->buffer_length;
612
written += (size_t)ret){
613
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO,
614
proc->buffer + written,
615
proc->buffer_length
616
- written));
617
if(ret < 0){
618
perror("write");
619
exitstatus = EXIT_FAILURE;
620
goto end;
621
}
993
994
bool bret = print_out_password(proc->buffer,
995
proc->buffer_length);
996
if(not bret){
997
perror("print_out_password");
998
exitstatus = EXIT_FAILURE;
622
999
}
623
goto end;
1000
goto fallback;
624
1001
}
1002
625
1003
/* This process has not completed. Does it have any output? */
626
1004
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
627
1005
/* This process had nothing to say at this time */
634
1012
if (proc->buffer == NULL){
635
1013
perror("malloc");
636
1014
exitstatus = EXIT_FAILURE;
637
goto end;
1015
goto fallback;
638
1016
}
639
1017
proc->buffer_size += BUFFER_SIZE;
640
1018
}
653
1031
}
654
1032
}
655
1033
}
656
if(process_list == NULL){
657
fprintf(stderr, "All plugin processes failed, exiting\n");
658
exitstatus = EXIT_FAILURE;
1034
1035
1036
fallback:
1037
1038
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1039
/* Fallback if all plugins failed, none are found or an error
1040
occured */
1041
bool bret;
1042
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
1043
char *passwordbuffer = getpass("Password: ");
1044
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1045
if(not bret){
1046
perror("print_out_password");
1047
exitstatus = EXIT_FAILURE;
1048
}
659
1049
}
660
1050
661
end:
662
1051
/* Restore old signal handler */
663
sigaction(SIGCHLD, &old_sigchld_action, NULL);
664
665
free(plus_argv);
666
667
/* Free the plugin list */
668
for(plugin *next; plugin_list != NULL; plugin_list = next){
669
next = plugin_list->next;
670
free(plugin_list->argv);
671
free(plugin_list);
1052
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1053
if(ret == -1){
1054
perror("sigaction");
1055
exitstatus = EXIT_FAILURE;
1056
}
1057
1058
if(custom_argv != NULL){
1059
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1060
free(*arg);
1061
}
1062
free(custom_argv);
672
1063
}
673
1064
674
1065
if(dir != NULL){
676
1067
}
677
1068
678
1069
/* Free the process list and kill the processes */
679
for(process *next; process_list != NULL; process_list = next){
680
next = process_list->next;
681
close(process_list->fd);
682
kill(process_list->pid, SIGTERM);
683
free(process_list->buffer);
684
free(process_list);
1070
for(plugin *p = plugin_list; p != NULL; p = p->next){
1071
if(p->pid != 0){
1072
close(p->fd);
1073
ret = kill(p->pid, SIGTERM);
1074
if(ret == -1 and errno != ESRCH){
1075
/* Set-uid proccesses might not get closed */
1076
perror("kill");
1077
}
1078
}
685
1079
}
686
1080
687
1081
/* Wait for any remaining child processes to terminate */
691
1085
if(errno != ECHILD){
692
1086
perror("wait");
693
1087
}
1088
1089
free_plugin_list();
1090
1091
free(plugindir);
1092
free(argfile);
694
1093
695
1094
return exitstatus;
696
1095
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0