3
3
* Mandos plugin runner - Run Mandos plugins
5
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
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
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(),
52
53
#include <fcntl.h> /* fcntl(), F_GETFD, F_SETFD,
69
70
#define PDIR "/lib/mandos/plugins.d"
70
71
#define AFILE "/conf/conf.d/mandos/plugin-runner.conf"
72
const char *argp_program_version = "plugin-runner 1.0";
73
const char *argp_program_version = "plugin-runner " VERSION;
73
74
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
77
76
typedef struct plugin{
78
77
char *name; /* can be NULL or any plugin name */
97
96
static plugin *plugin_list = NULL;
99
/* Gets a existing plugin based on name,
98
/* Gets an existing plugin based on name,
100
99
or if none is found, creates a new one */
101
100
static plugin *getplugin(char *name){
102
101
/* Check for exiting plugin with that name */
181
180
/* Add to a plugin's environment */
182
static bool add_environment(plugin *p, const char *def){
181
static bool add_environment(plugin *p, const char *def, bool replace){
185
/* namelen = length of name of environment variable */
186
size_t namelen = (size_t)(strchrnul(def, '=') - def);
187
/* Search for this environment variable */
188
for(char **e = p->environ; *e != NULL; e++){
189
if(strncmp(*e, def, namelen + 1) == 0){
190
/* It already exists */
192
char *new = realloc(*e, strlen(def) + 1);
186
202
return add_to_char_array(def, &(p->environ), &(p->envc));
191
207
* Descriptor Flags".
192
208
* *Note File Descriptor Flags:(libc)Descriptor Flags.
194
static int set_cloexec_flag(int fd)
210
static int set_cloexec_flag(int fd){
196
211
int ret = fcntl(fd, F_GETFD, 0);
197
212
/* If reading the flags failed, return error indication now. */
206
221
/* Mark processes as completed when they exit, and save their exit
208
void handle_sigchld(__attribute__((unused)) int sig){
223
static void handle_sigchld(__attribute__((unused)) int sig){
210
225
plugin *proc = plugin_list;
238
253
/* Prints out a password to stdout */
239
bool print_out_password(const char *buffer, size_t length){
254
static bool print_out_password(const char *buffer, size_t length){
241
if(length>0 and buffer[length-1] == '\n'){
244
256
for(size_t written = 0; written < length; written += (size_t)ret){
245
257
ret = TEMP_FAILURE_RETRY(write(STDOUT_FILENO, buffer + written,
246
258
length - written));
327
340
{ .name = "global-options", .key = 'g',
328
341
.arg = "OPTION[,OPTION[,...]]",
329
342
.doc = "Options passed to all plugins" },
330
{ .name = "global-envs", .key = 'e',
343
{ .name = "global-env", .key = 'G',
331
344
.arg = "VAR=value",
332
345
.doc = "Environment variable passed to all plugins" },
333
346
{ .name = "options-for", .key = 'o',
334
347
.arg = "PLUGIN:OPTION[,OPTION[,...]]",
335
348
.doc = "Options passed only to specified plugin" },
336
{ .name = "envs-for", .key = 'f',
349
{ .name = "env-for", .key = 'E',
337
350
.arg = "PLUGIN:ENV=value",
338
351
.doc = "Environment variable passed to specified plugin" },
339
352
{ .name = "disable", .key = 'd',
341
354
.doc = "Disable a specific plugin", .group = 1 },
355
{ .name = "enable", .key = 'e',
357
.doc = "Enable a specific plugin", .group = 1 },
342
358
{ .name = "plugin-dir", .key = 128,
343
359
.arg = "DIRECTORY",
344
360
.doc = "Specify a different plugin directory", .group = 2 },
359
375
error_t parse_opt (int key, char *arg, __attribute__((unused))
360
376
struct argp_state *state) {
361
/* Get the INPUT argument from `argp_parse', which we know is a
362
pointer to our plugin list pointer. */
364
378
case 'g': /* --global-options */
365
379
if (arg != NULL){
378
case 'e': /* --global-envs */
392
case 'G': /* --global-env */
383
char *envdef = strdup(arg);
387
if(not add_environment(getplugin(NULL), envdef)){
388
perror("add_environment");
396
if(not add_environment(getplugin(NULL), arg, true)){
397
perror("add_environment");
392
400
case 'o': /* --options-for */
393
401
if (arg != NULL){
394
402
char *p_name = strsep(&arg, ":");
395
if(p_name[0] == '\0'){
403
if(p_name[0] == '\0' or arg == NULL){
398
406
char *opt = strsep(&arg, ":");
407
if(opt[0] == '\0' or opt == NULL){
404
while((p = strsep(&opt, ",")) != NULL){
408
if(not add_argument(getplugin(p_name), p)){
409
perror("add_argument");
410
return ARGP_ERR_UNKNOWN;
411
while((p = strsep(&opt, ",")) != NULL){
415
if(not add_argument(getplugin(p_name), p)){
416
perror("add_argument");
417
return ARGP_ERR_UNKNOWN;
416
case 'f': /* --envs-for */
422
case 'E': /* --env-for */
422
428
if(envdef == NULL){
425
char *p_name = strndup(arg, (size_t) (envdef-arg));
430
if(not add_environment(getplugin(p_name), envdef)){
432
if(not add_environment(getplugin(arg), envdef+1, true)){
431
433
perror("add_environment");
441
443
p->disabled = true;
446
case 'e': /* --enable */
448
plugin *p = getplugin(arg);
450
return ARGP_ERR_UNKNOWN;
444
455
case 128: /* --plugin-dir */
445
457
plugindir = strdup(arg);
446
458
if(plugindir == NULL){
447
459
perror("strdup");
450
462
case 129: /* --config-file */
463
/* This is already done by parse_opt_config_file() */
465
case 130: /* --userid */
466
uid = (uid_t)strtol(arg, NULL, 10);
468
case 131: /* --groupid */
469
gid = (gid_t)strtol(arg, NULL, 10);
471
case 132: /* --debug */
475
/* Cryptsetup always passes an argument, which is an empty
476
string if "none" was specified in /etc/crypttab. So if
477
argument was empty, we ignore it silently. */
479
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
485
return ARGP_ERR_UNKNOWN;
490
/* This option parser is the same as parse_opt() above, except it
491
ignores everything but the --config-file option. */
492
error_t parse_opt_config_file (int key, char *arg,
493
__attribute__((unused))
494
struct argp_state *state) {
496
case 'g': /* --global-options */
497
case 'G': /* --global-env */
498
case 'o': /* --options-for */
499
case 'E': /* --env-for */
500
case 'd': /* --disable */
501
case 'e': /* --enable */
502
case 128: /* --plugin-dir */
504
case 129: /* --config-file */
451
506
argfile = strdup(arg);
452
507
if(argfile == NULL){
453
508
perror("strdup");
456
511
case 130: /* --userid */
457
uid = (uid_t)strtol(arg, NULL, 10);
459
512
case 131: /* --groupid */
460
gid = (gid_t)strtol(arg, NULL, 10);
462
513
case 132: /* --debug */
465
514
case ARGP_KEY_ARG:
466
fprintf(stderr, "Ignoring unknown argument \"%s\"\n", arg);
468
515
case ARGP_KEY_END:
476
struct argp argp = { .options = options, .parser = parse_opt,
477
.args_doc = "[+PLUS_SEPARATED_OPTIONS]",
523
struct argp argp = { .options = options,
524
.parser = parse_opt_config_file,
478
526
.doc = "Mandos plugin runner -- Run plugins" };
480
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
528
/* Parse using the parse_opt_config_file in order to get the custom
529
config file location, if any. */
530
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
481
531
if (ret == ARGP_ERR_UNKNOWN){
482
532
fprintf(stderr, "Unknown error while parsing arguments\n");
483
533
exitstatus = EXIT_FAILURE;
487
/* Opens the configfile if aviable */
537
/* Reset to the normal argument parser */
538
argp.parser = parse_opt;
540
/* Open the configfile if available */
488
541
if (argfile == NULL){
489
542
conffp = fopen(AFILE, "r");
494
547
char *org_line = NULL;
495
548
char *p, *arg, *new_arg, *line;
498
550
const char whitespace_delims[] = " \r\t\f\v\n";
499
551
const char comment_delim[] = "#";
556
608
/* If there was any arguments from configuration file,
557
609
pass them to parser as command arguments */
558
610
if(custom_argv != NULL){
559
ret = argp_parse (&argp, custom_argc, custom_argv, 0, 0, NULL);
611
ret = argp_parse (&argp, custom_argc, custom_argv, ARGP_IN_ORDER,
560
613
if (ret == ARGP_ERR_UNKNOWN){
561
614
fprintf(stderr, "Unknown error while parsing arguments\n");
562
615
exitstatus = EXIT_FAILURE;
620
/* Parse actual command line arguments, to let them override the
622
ret = argp_parse (&argp, argc, argv, ARGP_IN_ORDER, 0, NULL);
623
if (ret == ARGP_ERR_UNKNOWN){
624
fprintf(stderr, "Unknown error while parsing arguments\n");
625
exitstatus = EXIT_FAILURE;
568
630
for(plugin *p = plugin_list; p != NULL; p=p->next){
569
631
fprintf(stderr, "Plugin: %s has %d arguments\n",
640
702
const char const *bad_suffixes[] = { "~", "#", ".dpkg-new",
642
705
".dpkg-divert", NULL };
643
706
for(const char **pre = bad_prefixes; *pre != NULL; pre++){
644
707
size_t pre_len = strlen(*pre);
678
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
741
if(plugindir == NULL){
742
ret = asprintf(&filename, PDIR "/%s", dirst->d_name);
744
ret = asprintf(&filename, "%s/%s", plugindir, dirst->d_name);
680
747
perror("asprintf");
724
791
/* Add global environment variables */
725
792
for(char **e = g->environ; *e != NULL; e++){
726
if(not add_environment(p, *e)){
793
if(not add_environment(p, *e, false)){
727
794
perror("add_environment");
735
802
if(p->environ[0] != NULL){
736
803
for(char **e = environ; *e != NULL; e++){
737
char *copy = strdup(*e);
742
if(not add_environment(p, copy)){
804
if(not add_environment(p, *e, false)){
743
805
perror("add_environment");
786
848
perror("sigaction");
787
849
_exit(EXIT_FAILURE);
789
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
851
ret = sigprocmask(SIG_UNBLOCK, &sigchld_action.sa_mask, NULL);
791
853
perror("sigprocmask");
792
854
_exit(EXIT_FAILURE);
795
857
ret = dup2(pipefd[1], STDOUT_FILENO); /* replace our stdout */
876
937
/* OK, now either a process completed, or something can be read
877
938
from one of them */
878
for(plugin *proc = plugin_list; proc != NULL; proc = proc->next){
939
for(plugin *proc = plugin_list; proc != NULL;){
879
940
/* Is this process completely done? */
880
941
if(proc->eof and proc->completed){
881
942
/* Only accept the plugin output if it exited cleanly */
908
969
exitstatus = EXIT_FAILURE;
973
plugin *next_plugin = proc->next;
911
974
free_plugin(proc);
912
977
/* We are done modifying process list, so unblock signal */
913
978
ret = sigprocmask (SIG_UNBLOCK, &sigchld_action.sa_mask,
938
1004
/* This process has not completed. Does it have any output? */
939
1005
if(proc->eof or not FD_ISSET(proc->fd, &rfds)){
940
1006
/* This process had nothing to say at this time */
943
1010
/* Before reading, make the process' data buffer large enough */
952
1019
proc->buffer_size += BUFFER_SIZE;
954
1021
/* Read from the process */
955
ret = read(proc->fd, proc->buffer + proc->buffer_length,
1022
sret = read(proc->fd, proc->buffer + proc->buffer_length,
958
1025
/* Read error from this process; ignore the error */
963
1031
proc->eof = true;
965
proc->buffer_length += (size_t) ret;
1033
proc->buffer_length += (size_t) sret;
977
1045
fprintf(stderr, "Going to fallback mode using getpass(3)\n");
978
1046
char *passwordbuffer = getpass("Password: ");
979
bret = print_out_password(passwordbuffer, strlen(passwordbuffer));
1047
size_t len = strlen(passwordbuffer);
1048
/* Strip trailing newline */
1049
if(len > 0 and passwordbuffer[len-1] == '\n'){
1050
passwordbuffer[len-1] = '\0'; /* not strictly necessary */
1053
bret = print_out_password(passwordbuffer, len);
981
1055
perror("print_out_password");
982
1056
exitstatus = EXIT_FAILURE;