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- Committer: Teddy Hogeborn
- Date: 2009-02-05 03:26:27 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090205032627-fbvgm97q5gtrbg10
* plugin-runner.c (handle_sigchld): Bug fix: Save and restore "errno".
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugin-runner.c
2
2
/*
3
3
* Mandos plugin runner - Run Mandos plugins
4
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
6
7
*
7
8
* This program is free software: you can redistribute it and/or
8
9
* modify it under the terms of the GNU General Public License as
21
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
23
*/
23
24
24
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
25
25
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), getline(),
26
asprintf() */
26
27
#include <stddef.h> /* size_t, NULL */
27
28
#include <stdlib.h> /* malloc(), exit(), EXIT_FAILURE,
28
29
EXIT_SUCCESS, realloc() */
29
30
#include <stdbool.h> /* bool, true, false */
30
#include <stdio.h> /* perror, popen(), fileno(),
31
fprintf(), stderr, STDOUT_FILENO */
31
#include <stdio.h> /* perror, fileno(), fprintf(),
32
stderr, STDOUT_FILENO */
32
33
#include <sys/types.h> /* DIR, opendir(), stat(), struct
33
34
stat, waitpid(), WIFEXITED(),
34
35
WEXITSTATUS(), wait(), pid_t,
46
47
fcntl(), setuid(), setgid(),
47
48
F_GETFD, F_SETFD, FD_CLOEXEC,
48
49
access(), pipe(), fork(), close()
49
dup2, STDOUT_FILENO, _exit(),
50
dup2(), STDOUT_FILENO, _exit(),
50
51
execv(), write(), read(),
51
52
close() */
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
53
54
FD_CLOEXEC */
54
#include <string.h> /* strtok, strlen(), strcpy(),
55
strcat() */
55
#include <string.h> /* strsep, strlen(), asprintf() */
56
56
#include <errno.h> /* errno */
57
57
#include <argp.h> /* struct argp_option, struct
58
58
argp_state, struct argp,
59
59
argp_parse(), ARGP_ERR_UNKNOWN,
60
ARGP_KEY_END, ARGP_KEY_ARG, error_t */
60
ARGP_KEY_END, ARGP_KEY_ARG,
61
error_t */
61
62
#include <signal.h> /* struct sigaction, sigemptyset(),
62
63
sigaddset(), sigaction(),
63
64
sigprocmask(), SIG_BLOCK, SIGCHLD,
64
65
SIG_UNBLOCK, kill() */
65
66
#include <errno.h> /* errno, EBADF */
67
#include <inttypes.h> /* intmax_t, SCNdMAX, PRIdMAX, */
66
68
67
69
#define BUFFER_SIZE 256
68
70
69
const char *argp_program_version = "mandos-client 1.0";
71
#define PDIR "/lib/mandos/plugins.d"
72
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
73
74
const char *argp_program_version = "plugin-runner " VERSION;
70
75
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
76
72
struct process;
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;
73
84
74
typedef struct process{
85
/* Variables used for running processes*/
75
86
pid_t pid;
76
87
int fd;
77
88
char *buffer;
78
89
size_t buffer_size;
79
90
size_t buffer_length;
80
91
bool eof;
81
bool completed;
92
volatile sig_atomic_t completed;
82
93
int status;
83
struct process *next;
84
} process;
85
86
typedef struct plugin{
87
char *name; /* can be NULL or any plugin name */
88
char **argv;
89
int argc;
90
bool disabled;
91
94
struct plugin *next;
92
95
} plugin;
93
96
94
static plugin *getplugin(char *name, plugin **plugin_list){
95
for (plugin *p = *plugin_list; p != NULL; p = p->next){
96
if ((p->name == name)
97
or (p->name and name and (strcmp(p->name, name) == 0))){
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){
104
if((p->name == name)
105
or (p->name and name and (strcmp(p->name, name) == 0))){
98
106
return p;
99
107
}
100
108
}
101
109
/* Create a new plugin */
102
110
plugin *new_plugin = malloc(sizeof(plugin));
103
if (new_plugin == NULL){
104
perror("malloc");
105
exit(EXIT_FAILURE);
106
}
107
new_plugin->name = name;
111
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
free(new_plugin);
119
return NULL;
120
}
121
}
122
123
*new_plugin = (plugin){ .name = copy_name,
124
.argc = 1,
125
.disabled = false,
126
.next = plugin_list };
127
108
128
new_plugin->argv = malloc(sizeof(char *) * 2);
109
if (new_plugin->argv == NULL){
110
perror("malloc");
111
exit(EXIT_FAILURE);
129
if(new_plugin->argv == NULL){
130
free(copy_name);
131
free(new_plugin);
132
return NULL;
112
133
}
113
new_plugin->argv[0] = name;
134
new_plugin->argv[0] = copy_name;
114
135
new_plugin->argv[1] = NULL;
115
new_plugin->argc = 1;
116
new_plugin->disabled = false;
117
new_plugin->next = *plugin_list;
136
137
new_plugin->environ = malloc(sizeof(char *));
138
if(new_plugin->environ == NULL){
139
free(copy_name);
140
free(new_plugin->argv);
141
free(new_plugin);
142
return NULL;
143
}
144
new_plugin->environ[0] = NULL;
145
118
146
/* Append the new plugin to the list */
119
*plugin_list = new_plugin;
147
plugin_list = new_plugin;
120
148
return new_plugin;
121
149
}
122
150
123
static void addargument(plugin *p, char *arg){
124
p->argv[p->argc] = arg;
125
p->argv = realloc(p->argv, sizeof(char *) * (size_t)(p->argc + 2));
126
if (p->argv == NULL){
127
perror("malloc");
128
exit(EXIT_FAILURE);
129
}
130
p->argc++;
131
p->argv[p->argc] = NULL;
151
/* Helper function for add_argument and add_environment */
152
static bool add_to_char_array(const char *new, char ***array,
153
int *len){
154
/* Resize the pointed-to array to hold one more pointer */
155
*array = realloc(*array, sizeof(char *)
156
* (size_t) ((*len) + 2));
157
/* Malloc check */
158
if(*array == NULL){
159
return false;
160
}
161
/* Make a copy of the new string */
162
char *copy = strdup(new);
163
if(copy == NULL){
164
return false;
165
}
166
/* Insert the copy */
167
(*array)[*len] = copy;
168
(*len)++;
169
/* Add a new terminating NULL pointer to the last element */
170
(*array)[*len] = NULL;
171
return true;
172
}
173
174
/* Add to a plugin's argument vector */
175
static bool add_argument(plugin *p, const char *arg){
176
if(p == NULL){
177
return false;
178
}
179
return add_to_char_array(arg, &(p->argv), &(p->argc));
180
}
181
182
/* Add to a plugin's environment */
183
static bool add_environment(plugin *p, const char *def, bool replace){
184
if(p == NULL){
185
return false;
186
}
187
/* namelen = length of name of environment variable */
188
size_t namelen = (size_t)(strchrnul(def, '=') - def);
189
/* Search for this environment variable */
190
for(char **e = p->environ; *e != NULL; e++){
191
if(strncmp(*e, def, namelen + 1) == 0){
192
/* It already exists */
193
if(replace){
194
char *new = realloc(*e, strlen(def) + 1);
195
if(new == NULL){
196
return false;
197
}
198
*e = new;
199
strcpy(*e, def);
200
}
201
return true;
202
}
203
}
204
return add_to_char_array(def, &(p->environ), &(p->envc));
132
205
}
133
206
134
207
/*
136
209
* Descriptor Flags".
137
210
* *Note File Descriptor Flags:(libc)Descriptor Flags.
138
211
*/
139
static int set_cloexec_flag(int fd)
140
{
212
static int set_cloexec_flag(int fd){
141
213
int ret = fcntl(fd, F_GETFD, 0);
142
214
/* If reading the flags failed, return error indication now. */
143
215
if(ret < 0){
147
219
return fcntl(fd, F_SETFD, ret | FD_CLOEXEC);
148
220
}
149
221
150
process *process_list = NULL;
151
222
152
/* Mark a process as completed when it exits, and save its exit
223
/* Mark processes as completed when they exit, and save their exit
153
224
status. */
154
void handle_sigchld(__attribute__((unused)) int sig){
155
process *proc = process_list;
156
int status;
157
pid_t pid = wait(&status);
158
if(pid == -1){
159
perror("wait");
160
return;
161
}
162
while(proc != NULL and proc->pid != pid){
163
proc = proc->next;
164
}
165
if(proc == NULL){
166
/* Process not found in process list */
167
return;
168
}
169
proc->status = status;
170
proc->completed = true;
225
static void handle_sigchld(__attribute__((unused)) int sig){
226
int old_errno = errno;
227
while(true){
228
plugin *proc = plugin_list;
229
int status;
230
pid_t pid = waitpid(-1, &status, WNOHANG);
231
if(pid == 0){
232
/* Only still running child processes */
233
break;
234
}
235
if(pid == -1){
236
if(errno == ECHILD){
237
/* No child processes */
238
break;
239
}
240
perror("waitpid");
241
}
242
243
/* A child exited, find it in process_list */
244
while(proc != NULL and proc->pid != pid){
245
proc = proc->next;
246
}
247
if(proc == NULL){
248
/* Process not found in process list */
249
continue;
250
}
251
proc->status = status;
252
proc->completed = 1;
253
}
254
errno = old_errno;
171
255
}
172
256
173
bool print_out_password(const char *buffer, size_t length){
257
/* Prints out a password to stdout */
258
static bool print_out_password(const char *buffer, size_t length){
174
259
ssize_t ret;
175
if(length>0 and buffer[length-1] == '\n'){
176
length--;
177
}
178
260
for(size_t written = 0; written < length; written += (size_t)ret){
179
261
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
180
262
length - written));
185
267
return true;
186
268
}
187
269
270
/* Removes and free a plugin from the plugin list */
271
static void free_plugin(plugin *plugin_node){
272
273
for(char **arg = plugin_node->argv; *arg != NULL; arg++){
274
free(*arg);
275
}
276
free(plugin_node->argv);
277
for(char **env = plugin_node->environ; *env != NULL; env++){
278
free(*env);
279
}
280
free(plugin_node->environ);
281
free(plugin_node->buffer);
282
283
/* Removes the plugin from the singly-linked list */
284
if(plugin_node == plugin_list){
285
/* First one - simple */
286
plugin_list = plugin_list->next;
287
} else {
288
/* Second one or later */
289
for(plugin *p = plugin_list; p != NULL; p = p->next){
290
if(p->next == plugin_node){
291
p->next = plugin_node->next;
292
break;
293
}
294
}
295
}
296
297
free(plugin_node);
298
}
299
300
static void free_plugin_list(void){
301
while(plugin_list != NULL){
302
free_plugin(plugin_list);
303
}
304
}
305
188
306
int main(int argc, char *argv[]){
189
const char *plugindir = "/conf/conf.d/mandos/plugins.d";
307
char *plugindir = NULL;
308
char *argfile = NULL;
309
FILE *conffp;
190
310
size_t d_name_len;
191
311
DIR *dir = NULL;
192
312
struct dirent *dirst;
193
313
struct stat st;
194
314
fd_set rfds_all;
195
int ret, maxfd = 0;
315
int ret, numchars, maxfd = 0;
316
ssize_t sret;
317
intmax_t tmpmax;
196
318
uid_t uid = 65534;
197
319
gid_t gid = 65534;
198
320
bool debug = false;
200
322
struct sigaction old_sigchld_action;
201
323
struct sigaction sigchld_action = { .sa_handler = handle_sigchld,
202
324
.sa_flags = SA_NOCLDSTOP };
203
char *plus_options = NULL;
204
char **plus_argv = NULL;
205
325
char **custom_argv = NULL;
326
int custom_argc = 0;
327
206
328
/* Establish a signal handler */
207
329
sigemptyset(&sigchld_action.sa_mask);
208
330
ret = sigaddset(&sigchld_action.sa_mask, SIGCHLD);
209
if(ret < 0){
331
if(ret == -1){
210
332
perror("sigaddset");
211
exit(EXIT_FAILURE);
333
exitstatus = EXIT_FAILURE;
334
goto fallback;
212
335
}
213
336
ret = sigaction(SIGCHLD, &sigchld_action, &old_sigchld_action);
214
if(ret < 0){
337
if(ret == -1){
215
338
perror("sigaction");
216
exit(EXIT_FAILURE);
339
exitstatus = EXIT_FAILURE;
340
goto fallback;
217
341
}
218
342
219
343
/* The options we understand. */
221
345
{ .name = "global-options", .key = 'g',
222
346
.arg = "OPTION[,OPTION[,...]]",
223
347
.doc = "Options passed to all plugins" },
348
{ .name = "global-env", .key = 'G',
349
.arg = "VAR=value",
350
.doc = "Environment variable passed to all plugins" },
224
351
{ .name = "options-for", .key = 'o',
225
352
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
226
353
.doc = "Options passed only to specified plugin" },
354
{ .name = "env-for", .key = 'E',
355
.arg = "PLUGIN:ENV=value",
356
.doc = "Environment variable passed to specified plugin" },
227
357
{ .name = "disable", .key = 'd',
228
358
.arg = "PLUGIN",
229
359
.doc = "Disable a specific plugin", .group = 1 },
360
{ .name = "enable", .key = 'e',
361
.arg = "PLUGIN",
362
.doc = "Enable a specific plugin", .group = 1 },
230
363
{ .name = "plugin-dir", .key = 128,
231
364
.arg = "DIRECTORY",
232
365
.doc = "Specify a different plugin directory", .group = 2 },
233
{ .name = "userid", .key = 129,
234
.arg = "ID", .flags = 0,
235
.doc = "User ID the plugins will run as", .group = 2 },
236
{ .name = "groupid", .key = 130,
237
.arg = "ID", .flags = 0,
238
.doc = "Group ID the plugins will run as", .group = 2 },
239
{ .name = "debug", .key = 131,
240
.doc = "Debug mode", .group = 3 },
366
{ .name = "config-file", .key = 129,
367
.arg = "FILE",
368
.doc = "Specify a different configuration file", .group = 2 },
369
{ .name = "userid", .key = 130,
370
.arg = "ID", .flags = 0,
371
.doc = "User ID the plugins will run as", .group = 3 },
372
{ .name = "groupid", .key = 131,
373
.arg = "ID", .flags = 0,
374
.doc = "Group ID the plugins will run as", .group = 3 },
375
{ .name = "debug", .key = 132,
376
.doc = "Debug mode", .group = 4 },
241
377
{ .name = NULL }
242
378
};
243
379
244
error_t parse_opt (int key, char *arg, struct argp_state *state) {
245
/* Get the INPUT argument from `argp_parse', which we know is a
246
pointer to our plugin list pointer. */
247
plugin **plugins = state->input;
248
switch (key) {
249
case 'g':
250
if (arg != NULL){
251
char *p = strtok(arg, ",");
252
do{
253
addargument(getplugin(NULL, plugins), p);
254
p = strtok(NULL, ",");
255
} while (p != NULL);
256
}
257
break;
258
case 'o':
259
if (arg != NULL){
260
char *name = strtok(arg, ":");
261
char *p = strtok(NULL, ":");
262
if(p != NULL){
263
p = strtok(p, ",");
264
do{
265
addargument(getplugin(name, plugins), p);
266
p = strtok(NULL, ",");
267
} while (p != NULL);
268
}
269
}
270
break;
271
case 'd':
272
if (arg != NULL){
273
getplugin(arg, plugins)->disabled = true;
274
}
275
break;
276
case 128:
277
plugindir = arg;
278
break;
279
case 129:
280
uid = (uid_t)strtol(arg, NULL, 10);
281
break;
282
case 130:
283
gid = (gid_t)strtol(arg, NULL, 10);
284
break;
285
case 131:
380
error_t parse_opt(int key, char *arg, __attribute__((unused))
381
struct argp_state *state){
382
switch(key){
383
case 'g': /* --global-options */
384
if(arg != NULL){
385
char *p;
386
while((p = strsep(&arg, ",")) != NULL){
387
if(p[0] == '\0'){
388
continue;
389
}
390
if(not add_argument(getplugin(NULL), p)){
391
perror("add_argument");
392
return ARGP_ERR_UNKNOWN;
393
}
394
}
395
}
396
break;
397
case 'G': /* --global-env */
398
if(arg == NULL){
399
break;
400
}
401
if(not add_environment(getplugin(NULL), arg, true)){
402
perror("add_environment");
403
}
404
break;
405
case 'o': /* --options-for */
406
if(arg != NULL){
407
char *p_name = strsep(&arg, ":");
408
if(p_name[0] == '\0' or arg == NULL){
409
break;
410
}
411
char *opt = strsep(&arg, ":");
412
if(opt[0] == '\0' or opt == NULL){
413
break;
414
}
415
char *p;
416
while((p = strsep(&opt, ",")) != NULL){
417
if(p[0] == '\0'){
418
continue;
419
}
420
if(not add_argument(getplugin(p_name), p)){
421
perror("add_argument");
422
return ARGP_ERR_UNKNOWN;
423
}
424
}
425
}
426
break;
427
case 'E': /* --env-for */
428
if(arg == NULL){
429
break;
430
}
431
{
432
char *envdef = strchr(arg, ':');
433
if(envdef == NULL){
434
break;
435
}
436
*envdef = '\0';
437
if(not add_environment(getplugin(arg), envdef+1, true)){
438
perror("add_environment");
439
}
440
}
441
break;
442
case 'd': /* --disable */
443
if(arg != NULL){
444
plugin *p = getplugin(arg);
445
if(p == NULL){
446
return ARGP_ERR_UNKNOWN;
447
}
448
p->disabled = true;
449
}
450
break;
451
case 'e': /* --enable */
452
if(arg != NULL){
453
plugin *p = getplugin(arg);
454
if(p == NULL){
455
return ARGP_ERR_UNKNOWN;
456
}
457
p->disabled = false;
458
}
459
break;
460
case 128: /* --plugin-dir */
461
free(plugindir);
462
plugindir = strdup(arg);
463
if(plugindir == NULL){
464
perror("strdup");
465
}
466
break;
467
case 129: /* --config-file */
468
/* This is already done by parse_opt_config_file() */
469
break;
470
case 130: /* --userid */
471
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
472
if(ret < 1 or tmpmax != (uid_t)tmpmax
473
or arg[numchars] != '\0'){
474
fprintf(stderr, "Bad user ID number: \"%s\", using %"
475
PRIdMAX "\n", arg, (intmax_t)uid);
476
} else {
477
uid = (uid_t)tmpmax;
478
}
479
break;
480
case 131: /* --groupid */
481
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
482
if(ret < 1 or tmpmax != (gid_t)tmpmax
483
or arg[numchars] != '\0'){
484
fprintf(stderr, "Bad group ID number: \"%s\", using %"
485
PRIdMAX "\n", arg, (intmax_t)gid);
486
} else {
487
gid = (gid_t)tmpmax;
488
}
489
break;
490
case 132: /* --debug */
286
491
debug = true;
287
492
break;
288
case ARGP_KEY_ARG:
289
if(plus_options != NULL or arg == NULL or arg[0] != '+'){
290
argp_usage (state);
291
}
292
plus_options = arg;
293
break;
294
case ARGP_KEY_END:
295
break;
296
default:
297
return ARGP_ERR_UNKNOWN;
298
}
299
return 0;
300
}
301
302
plugin *plugin_list = NULL;
303
304
struct argp argp = { .options = options, .parser = parse_opt,
305
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
493
/*
494
* When adding more options before this line, remember to also add a
495
* "case" to the "parse_opt_config_file" function below.
496
*/
497
case ARGP_KEY_ARG:
498
/* Cryptsetup always passes an argument, which is an empty
499
string if "none" was specified in /etc/crypttab. So if
500
argument was empty, we ignore it silently. */
501
if(arg[0] != '\0'){
502
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
503
}
504
break;
505
case ARGP_KEY_END:
506
break;
507
default:
508
return ARGP_ERR_UNKNOWN;
509
}
510
return 0;
511
}
512
513
/* This option parser is the same as parse_opt() above, except it
514
ignores everything but the --config-file option. */
515
error_t parse_opt_config_file(int key, char *arg,
516
__attribute__((unused))
517
struct argp_state *state){
518
switch(key){
519
case 'g': /* --global-options */
520
case 'G': /* --global-env */
521
case 'o': /* --options-for */
522
case 'E': /* --env-for */
523
case 'd': /* --disable */
524
case 'e': /* --enable */
525
case 128: /* --plugin-dir */
526
break;
527
case 129: /* --config-file */
528
free(argfile);
529
argfile = strdup(arg);
530
if(argfile == NULL){
531
perror("strdup");
532
}
533
break;
534
case 130: /* --userid */
535
case 131: /* --groupid */
536
case 132: /* --debug */
537
case ARGP_KEY_ARG:
538
case ARGP_KEY_END:
539
break;
540
default:
541
return ARGP_ERR_UNKNOWN;
542
}
543
return 0;
544
}
545
546
struct argp argp = { .options = options,
547
.parser = parse_opt_config_file,
548
.args_doc = "",
306
549
.doc = "Mandos plugin runner -- Run plugins" };
307
550
308
ret = argp_parse (&argp, argc, argv, 0, 0, &plugin_list);
309
if (ret == ARGP_ERR_UNKNOWN){
551
/* Parse using parse_opt_config_file() in order to get the custom
552
config file location, if any. */
553
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
554
if(ret == ARGP_ERR_UNKNOWN){
310
555
fprintf(stderr, "Unknown error while parsing arguments\n");
311
556
exitstatus = EXIT_FAILURE;
312
goto end;
557
goto fallback;
313
558
}
314
559
315
if(plus_options){
316
/* This is a mangled argument in the form of
317
"+--option+--other-option=parameter+--yet-another-option", etc */
318
/* Make new argc and argv vars, and call argp_parse() again. */
319
plus_options++; /* skip the first '+' character */
320
const char delims[] = "+";
321
char *arg;
322
int new_argc = 1;
323
plus_argv = malloc(sizeof(char*) * 2);
324
if(plus_argv == NULL){
560
/* Reset to the normal argument parser */
561
argp.parser = parse_opt;
562
563
/* Open the configfile if available */
564
if(argfile == NULL){
565
conffp = fopen(AFILE, "r");
566
} else {
567
conffp = fopen(argfile, "r");
568
}
569
if(conffp != NULL){
570
char *org_line = NULL;
571
char *p, *arg, *new_arg, *line;
572
size_t size = 0;
573
const char whitespace_delims[] = " \r\t\f\v\n";
574
const char comment_delim[] = "#";
575
576
custom_argc = 1;
577
custom_argv = malloc(sizeof(char*) * 2);
578
if(custom_argv == NULL){
325
579
perror("malloc");
326
580
exitstatus = EXIT_FAILURE;
327
goto end;
328
}
329
plus_argv[0] = argv[0];
330
plus_argv[1] = NULL;
331
arg = strtok(plus_options, delims); /* Get first argument */
332
while(arg != NULL){
333
new_argc++;
334
plus_argv = realloc(plus_argv, sizeof(char *)
335
* ((unsigned int) new_argc + 1));
336
if(plus_argv == NULL){
337
perror("realloc");
338
exitstatus = EXIT_FAILURE;
339
goto end;
340
}
341
plus_argv[new_argc-1] = arg;
342
plus_argv[new_argc] = NULL;
343
arg = strtok(NULL, delims); /* Get next argument */
344
}
345
ret = argp_parse (&argp, new_argc, plus_argv, 0, 0, &plugin_list);
346
if (ret == ARGP_ERR_UNKNOWN){
581
goto fallback;
582
}
583
custom_argv[0] = argv[0];
584
custom_argv[1] = NULL;
585
586
/* for each line in the config file, strip whitespace and ignore
587
commented text */
588
while(true){
589
sret = getline(&org_line, &size, conffp);
590
if(sret == -1){
591
break;
592
}
593
594
line = org_line;
595
arg = strsep(&line, comment_delim);
596
while((p = strsep(&arg, whitespace_delims)) != NULL){
597
if(p[0] == '\0'){
598
continue;
599
}
600
new_arg = strdup(p);
601
if(new_arg == NULL){
602
perror("strdup");
603
exitstatus = EXIT_FAILURE;
604
free(org_line);
605
goto fallback;
606
}
607
608
custom_argc += 1;
609
custom_argv = realloc(custom_argv, sizeof(char *)
610
* ((unsigned int) custom_argc + 1));
611
if(custom_argv == NULL){
612
perror("realloc");
613
exitstatus = EXIT_FAILURE;
614
free(org_line);
615
goto fallback;
616
}
617
custom_argv[custom_argc-1] = new_arg;
618
custom_argv[custom_argc] = NULL;
619
}
620
}
621
free(org_line);
622
} else {
623
/* Check for harmful errors and go to fallback. Other errors might
624
not affect opening plugins */
625
if(errno == EMFILE or errno == ENFILE or errno == ENOMEM){
626
perror("fopen");
627
exitstatus = EXIT_FAILURE;
628
goto fallback;
629
}
630
}
631
/* If there was any arguments from configuration file,
632
pass them to parser as command arguments */
633
if(custom_argv != NULL){
634
ret = argp_parse(&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
635
0, NULL);
636
if(ret == ARGP_ERR_UNKNOWN){
347
637
fprintf(stderr, "Unknown error while parsing arguments\n");
348
638
exitstatus = EXIT_FAILURE;
349
goto end;
639
goto fallback;
350
640
}
351
641
}
352
642
643
/* Parse actual command line arguments, to let them override the
644
config file */
645
ret = argp_parse(&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
646
if(ret == ARGP_ERR_UNKNOWN){
647
fprintf(stderr, "Unknown error while parsing arguments\n");
648
exitstatus = EXIT_FAILURE;
649
goto fallback;
650
}
651
353
652
if(debug){
354
653
for(plugin *p = plugin_list; p != NULL; p=p->next){
355
654
fprintf(stderr, "Plugin: %s has %d arguments\n",
357
656
for(char **a = p->argv; *a != NULL; a++){
358
657
fprintf(stderr, "\tArg: %s\n", *a);
359
658
}
659
fprintf(stderr, "...and %d environment variables\n", p->envc);
660
for(char **a = p->environ; *a != NULL; a++){
661
fprintf(stderr, "\t%s\n", *a);
662
}
360
663
}
361
664
}
362
665
666
/* Strip permissions down to nobody */
363
667
ret = setuid(uid);
364
if (ret == -1){
668
if(ret == -1){
365
669
perror("setuid");
366
}
367
670
}
368
671
setgid(gid);
369
if (ret == -1){
672
if(ret == -1){
370
673
perror("setgid");
371
674
}
372
675
373
dir = opendir(plugindir);
676
if(plugindir == NULL){
677
dir = opendir(PDIR);
678
} else {
679
dir = opendir(plugindir);
680
}
681
374
682
if(dir == NULL){
375
683
perror("Could not open plugin dir");
376
684
exitstatus = EXIT_FAILURE;
377
goto end;
685
goto fallback;
378
686
}
379
687
380
688
/* Set the FD_CLOEXEC flag on the directory, if possible */
385
693
if(ret < 0){
386
694
perror("set_cloexec_flag");
387
695
exitstatus = EXIT_FAILURE;
388
goto end;
696
goto fallback;
389
697
}
390
698
}
391
699
}
392
700
393
701
FD_ZERO(&rfds_all);
394
702
703
/* Read and execute any executable in the plugin directory*/
395
704
while(true){
396
705
dirst = readdir(dir);
397
706
398
// All directory entries have been processed
707
/* All directory entries have been processed */
399
708
if(dirst == NULL){
400
if (errno == EBADF){
709
if(errno == EBADF){
401
710
perror("readdir");
402
711
exitstatus = EXIT_FAILURE;
403
goto end;
712
goto fallback;
404
713
}
405
714
break;
406
715
}
407
716
408
717
d_name_len = strlen(dirst->d_name);
409
718
410
// Ignore dotfiles, backup files and other junk
719
/* Ignore dotfiles, backup files and other junk */
411
720
{
412
721
bool bad_name = false;
413
722
415
724
416
725
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
417
726
".dpkg-old",
727
".dpkg-bak",
418
728
".dpkg-divert", NULL };
419
729
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
420
730
size_t pre_len = strlen(*pre);
428
738
break;
429
739
}
430
740
}
431
432
741
if(bad_name){
433
742
continue;
434
743
}
435
436
744
for(const char **suf = bad_suffixes; *suf != NULL; suf++){
437
745
size_t suf_len = strlen(*suf);
438
746
if((d_name_len >= suf_len)
451
759
continue;
452
760
}
453
761
}
454
455
char *filename = malloc(d_name_len + strlen(plugindir) + 2);
456
if (filename == NULL){
457
perror("malloc");
762
763
char *filename;
764
if(plugindir == NULL){
765
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
766
} else {
767
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
768
}
769
if(ret < 0){
770
perror("asprintf");
458
771
continue;
459
772
}
460
strcpy(filename, plugindir); /* Spurious warning */
461
strcat(filename, "/"); /* Spurious warning */
462
strcat(filename, dirst->d_name); /* Spurious warning */
463
773
464
774
ret = stat(filename, &st);
465
if (ret == -1){
775
if(ret == -1){
466
776
perror("stat");
467
777
free(filename);
468
778
continue;
469
779
}
470
471
if (not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
780
781
/* Ignore non-executable files */
782
if(not S_ISREG(st.st_mode) or (access(filename, X_OK) != 0)){
472
783
if(debug){
473
784
fprintf(stderr, "Ignoring plugin dir entry \"%s\""
474
785
" with bad type or mode\n", filename);
476
787
free(filename);
477
788
continue;
478
789
}
479
if(getplugin(dirst->d_name, &plugin_list)->disabled){
790
791
plugin *p = getplugin(dirst->d_name);
792
if(p == NULL){
793
perror("getplugin");
794
free(filename);
795
continue;
796
}
797
if(p->disabled){
480
798
if(debug){
481
799
fprintf(stderr, "Ignoring disabled plugin \"%s\"\n",
482
800
dirst->d_name);
484
802
free(filename);
485
803
continue;
486
804
}
487
plugin *p = getplugin(dirst->d_name, &plugin_list);
488
805
{
489
806
/* Add global arguments to argument list for this plugin */
490
plugin *g = getplugin(NULL, &plugin_list);
491
for(char **a = g->argv + 1; *a != NULL; a++){
492
addargument(p, *a);
493
}
494
}
495
int pipefd[2];
807
plugin *g = getplugin(NULL);
808
if(g != NULL){
809
for(char **a = g->argv + 1; *a != NULL; a++){
810
if(not add_argument(p, *a)){
811
perror("add_argument");
812
}
813
}
814
/* Add global environment variables */
815
for(char **e = g->environ; *e != NULL; e++){
816
if(not add_environment(p, *e, false)){
817
perror("add_environment");
818
}
819
}
820
}
821
}
822
/* If this plugin has any environment variables, we will call
823
using execve and need to duplicate the environment from this
824
process, too. */
825
if(p->environ[0] != NULL){
826
for(char **e = environ; *e != NULL; e++){
827
if(not add_environment(p, *e, false)){
828
perror("add_environment");
829
}
830
}
831
}
832
833
int pipefd[2];
496
834
ret = pipe(pipefd);
497
if (ret == -1){
835
if(ret == -1){
498
836
perror("pipe");
499
837
exitstatus = EXIT_FAILURE;
500
goto end;
838
goto fallback;
501
839
}
840
/* Ask OS to automatic close the pipe on exec */
502
841
ret = set_cloexec_flag(pipefd[0]);
503
842
if(ret < 0){
504
843
perror("set_cloexec_flag");
505
844
exitstatus = EXIT_FAILURE;
506
goto end;
845
goto fallback;
507
846
}
508
847
ret = set_cloexec_flag(pipefd[1]);
509
848
if(ret < 0){
510
849
perror("set_cloexec_flag");
511
850
exitstatus = EXIT_FAILURE;
512
goto end;
851
goto fallback;
513
852
}
514
853
/* Block SIGCHLD until process is safely in process list */
515
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
854
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
516
855
if(ret < 0){
517
856
perror("sigprocmask");
518
857
exitstatus = EXIT_FAILURE;
519
goto end;
858
goto fallback;
520
859
}
521
// Starting a new process to be watched
860
/* Starting a new process to be watched */
522
861
pid_t pid = fork();
523
862
if(pid == -1){
524
863
perror("fork");
525
864
exitstatus = EXIT_FAILURE;
526
goto end;
865
goto fallback;
527
866
}
528
867
if(pid == 0){
529
868
/* this is the child process */
532
871
perror("sigaction");
533
872
_exit(EXIT_FAILURE);
534
873
}
535
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
874
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
536
875
if(ret < 0){
537
876
perror("sigprocmask");
538
877
_exit(EXIT_FAILURE);
539
878
}
540
879
541
880
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
542
881
if(ret == -1){
543
882
perror("dup2");
549
888
above and must now close it manually here. */
550
889
closedir(dir);
551
890
}
552
if(execv(filename, p->argv) < 0){
553
perror("execv");
554
_exit(EXIT_FAILURE);
891
if(p->environ[0] == NULL){
892
if(execv(filename, p->argv) < 0){
893
perror("execv");
894
_exit(EXIT_FAILURE);
895
}
896
} else {
897
if(execve(filename, p->argv, p->environ) < 0){
898
perror("execve");
899
_exit(EXIT_FAILURE);
900
}
555
901
}
556
902
/* no return */
557
903
}
558
/* parent process */
904
/* Parent process */
905
close(pipefd[1]); /* Close unused write end of pipe */
559
906
free(filename);
560
close(pipefd[1]); /* close unused write end of pipe */
561
process *new_process = malloc(sizeof(process));
562
if (new_process == NULL){
563
perror("malloc");
564
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
907
plugin *new_plugin = getplugin(dirst->d_name);
908
if(new_plugin == NULL){
909
perror("getplugin");
910
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
565
911
if(ret < 0){
566
perror("sigprocmask");
912
perror("sigprocmask");
567
913
}
568
914
exitstatus = EXIT_FAILURE;
569
goto end;
915
goto fallback;
570
916
}
571
917
572
*new_process = (struct process){ .pid = pid,
573
.fd = pipefd[0],
574
.next = process_list };
575
// List handling
576
process_list = new_process;
918
new_plugin->pid = pid;
919
new_plugin->fd = pipefd[0];
920
577
921
/* Unblock SIGCHLD so signal handler can be run if this process
578
922
has already completed */
579
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
923
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
580
924
if(ret < 0){
581
925
perror("sigprocmask");
582
926
exitstatus = EXIT_FAILURE;
583
goto end;
584
}
585
586
FD_SET(new_process->fd, &rfds_all);
587
588
if (maxfd < new_process->fd){
589
maxfd = new_process->fd;
590
}
591
592
}
593
594
/* Free the plugin list */
595
for(plugin *next; plugin_list != NULL; plugin_list = next){
596
next = plugin_list->next;
597
free(plugin_list->argv);
598
free(plugin_list);
927
goto fallback;
928
}
929
930
FD_SET(new_plugin->fd, &rfds_all);
931
932
if(maxfd < new_plugin->fd){
933
maxfd = new_plugin->fd;
934
}
599
935
}
600
936
601
937
closedir(dir);
602
938
dir = NULL;
603
604
if (process_list == NULL){
605
fprintf(stderr, "No plugin processes started. Incorrect plugin"
606
" directory?\n");
607
process_list = NULL;
939
940
for(plugin *p = plugin_list; p != NULL; p = p->next){
941
if(p->pid != 0){
942
break;
943
}
944
if(p->next == NULL){
945
fprintf(stderr, "No plugin processes started. Incorrect plugin"
946
" directory?\n");
947
free_plugin_list();
948
}
608
949
}
609
while(process_list){
950
951
/* Main loop while running plugins exist */
952
while(plugin_list){
610
953
fd_set rfds = rfds_all;
611
954
int select_ret = select(maxfd+1, &rfds, NULL, NULL, NULL);
612
if (select_ret == -1){
955
if(select_ret == -1){
613
956
perror("select");
614
957
exitstatus = EXIT_FAILURE;
615
goto end;
958
goto fallback;
616
959
}
617
960
/* OK, now either a process completed, or something can be read
618
961
from one of them */
619
for(process *proc = process_list; proc ; proc = proc->next){
962
for(plugin *proc = plugin_list; proc != NULL;){
620
963
/* Is this process completely done? */
621
if(proc->eof and proc->completed){
964
if(proc->completed and proc->eof){
622
965
/* Only accept the plugin output if it exited cleanly */
623
966
if(not WIFEXITED(proc->status)
624
967
or WEXITSTATUS(proc->status) != 0){
625
968
/* Bad exit by plugin */
969
626
970
if(debug){
627
971
if(WIFEXITED(proc->status)){
628
fprintf(stderr, "Plugin %u exited with status %d\n",
629
(unsigned int) (proc->pid),
972
fprintf(stderr, "Plugin %" PRIdMAX " exited with status"
973
" %d\n", (intmax_t) (proc->pid),
630
974
WEXITSTATUS(proc->status));
631
} else if(WIFSIGNALED(proc->status)) {
632
fprintf(stderr, "Plugin %u killed by signal %d\n",
633
(unsigned int) (proc->pid),
975
} else if(WIFSIGNALED(proc->status)){
976
fprintf(stderr, "Plugin %" PRIdMAX " killed by signal"
977
" %d\n", (intmax_t) (proc->pid),
634
978
WTERMSIG(proc->status));
635
979
} else if(WCOREDUMP(proc->status)){
636
fprintf(stderr, "Plugin %d dumped core\n",
637
(unsigned int) (proc->pid));
980
fprintf(stderr, "Plugin %" PRIdMAX " dumped core\n",
981
(intmax_t) (proc->pid));
638
982
}
639
983
}
984
640
985
/* Remove the plugin */
641
986
FD_CLR(proc->fd, &rfds_all);
987
642
988
/* Block signal while modifying process_list */
643
ret = sigprocmask (SIG_BLOCK, &sigchld_action.sa_mask, NULL);
989
ret = sigprocmask(SIG_BLOCK, &sigchld_action.sa_mask, NULL);
644
990
if(ret < 0){
645
991
perror("sigprocmask");
646
992
exitstatus = EXIT_FAILURE;
647
goto end;
648
}
649
/* Delete this process entry from the list */
650
if(process_list == proc){
651
/* First one - simple */
652
process_list = proc->next;
653
} else {
654
/* Second one or later */
655
for(process *p = process_list; p != NULL; p = p->next){
656
if(p->next == proc){
657
p->next = proc->next;
658
break;
659
}
660
}
661
}
993
goto fallback;
994
}
995
996
plugin *next_plugin = proc->next;
997
free_plugin(proc);
998
proc = next_plugin;
999
662
1000
/* We are done modifying process list, so unblock signal */
663
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
664
NULL);
1001
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask,
1002
NULL);
665
1003
if(ret < 0){
666
1004
perror("sigprocmask");
667
}
668
free(proc->buffer);
669
free(proc);
670
/* We deleted this process from the list, so we can't go
671
proc->next. Therefore, start over from the beginning of
672
the process list */
673
break;
1005
exitstatus = EXIT_FAILURE;
1006
goto fallback;
1007
}
1008
1009
if(plugin_list == NULL){
1010
break;
1011
}
1012
1013
continue;
674
1014
}
1015
675
1016
/* This process exited nicely, so print its buffer */
676
677
bool bret = print_out_password(proc->buffer, proc->buffer_length);
1017
1018
bool bret = print_out_password(proc->buffer,
1019
proc->buffer_length);
678
1020
if(not bret){
679
1021
perror("print_out_password");
680
1022
exitstatus = EXIT_FAILURE;
681
1023
}
682
goto end;
1024
goto fallback;
683
1025
}
1026
684
1027
/* This process has not completed. Does it have any output? */
685
1028
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
686
1029
/* This process had nothing to say at this time */
1030
proc = proc->next;
687
1031
continue;
688
1032
}
689
1033
/* Before reading, make the process' data buffer large enough */
690
1034
if(proc->buffer_length + BUFFER_SIZE > proc->buffer_size){
691
1035
proc->buffer = realloc(proc->buffer, proc->buffer_size
692
1036
+ (size_t) BUFFER_SIZE);
693
if (proc->buffer == NULL){
1037
if(proc->buffer == NULL){
694
1038
perror("malloc");
695
1039
exitstatus = EXIT_FAILURE;
696
goto end;
1040
goto fallback;
697
1041
}
698
1042
proc->buffer_size += BUFFER_SIZE;
699
1043
}
700
1044
/* Read from the process */
701
ret = read(proc->fd, proc->buffer + proc->buffer_length,
702
BUFFER_SIZE);
703
if(ret < 0){
1045
sret = read(proc->fd, proc->buffer + proc->buffer_length,
1046
BUFFER_SIZE);
1047
if(sret < 0){
704
1048
/* Read error from this process; ignore the error */
1049
proc = proc->next;
705
1050
continue;
706
1051
}
707
if(ret == 0){
1052
if(sret == 0){
708
1053
/* got EOF */
709
1054
proc->eof = true;
710
1055
} else {
711
proc->buffer_length += (size_t) ret;
1056
proc->buffer_length += (size_t) sret;
712
1057
}
713
1058
}
714
1059
}
715
1060
716
1061
717
end:
1062
fallback:
718
1063
719
if(process_list == NULL or exitstatus != EXIT_SUCCESS){
720
/* Fallback if all plugins failed, none are found or an error occured */
1064
if(plugin_list == NULL or exitstatus != EXIT_SUCCESS){
1065
/* Fallback if all plugins failed, none are found or an error
1066
occured */
721
1067
bool bret;
722
1068
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
723
1069
char *passwordbuffer = getpass("Password: ");
724
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1070
size_t len = strlen(passwordbuffer);
1071
/* Strip trailing newline */
1072
if(len > 0 and passwordbuffer[len-1] == '\n'){
1073
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1074
len--;
1075
}
1076
bret = print_out_password(passwordbuffer, len);
725
1077
if(not bret){
726
1078
perror("print_out_password");
727
1079
exitstatus = EXIT_FAILURE;
728
goto end;
729
1080
}
730
1081
}
731
1082
732
1083
/* Restore old signal handler */
733
sigaction(SIGCHLD, &old_sigchld_action, NULL);
734
735
free(plus_argv);
736
737
/* Free the plugin list */
738
for(plugin *next; plugin_list != NULL; plugin_list = next){
739
next = plugin_list->next;
740
free(plugin_list->argv);
741
free(plugin_list);
1084
ret = sigaction(SIGCHLD, &old_sigchld_action, NULL);
1085
if(ret == -1){
1086
perror("sigaction");
1087
exitstatus = EXIT_FAILURE;
1088
}
1089
1090
if(custom_argv != NULL){
1091
for(char **arg = custom_argv+1; *arg != NULL; arg++){
1092
free(*arg);
1093
}
1094
free(custom_argv);
742
1095
}
743
1096
744
1097
if(dir != NULL){
745
1098
closedir(dir);
746
1099
}
747
1100
748
/* Free the process list and kill the processes */
749
for(process *next; process_list != NULL; process_list = next){
750
next = process_list->next;
751
close(process_list->fd);
752
ret = kill(process_list->pid, SIGTERM);
753
if(ret == -1 and errno != ESRCH){
754
/* set-uid proccesses migth not get closed */
755
perror("kill");
1101
/* Kill the processes */
1102
for(plugin *p = plugin_list; p != NULL; p = p->next){
1103
if(p->pid != 0){
1104
close(p->fd);
1105
ret = kill(p->pid, SIGTERM);
1106
if(ret == -1 and errno != ESRCH){
1107
/* Set-uid proccesses might not get closed */
1108
perror("kill");
1109
}
756
1110
}
757
free(process_list->buffer);
758
free(process_list);
759
1111
}
760
1112
761
1113
/* Wait for any remaining child processes to terminate */
766
1118
perror("wait");
767
1119
}
768
1120
1121
free_plugin_list();
1122
1123
free(plugindir);
1124
free(argfile);
1125
769
1126
return exitstatus;
770
1127
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0