32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
#include <net/if.h> /* if_nametoindex */
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#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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#include <stdint.h> /* uint16_t, uint32_t */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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#include <stdbool.h> /* bool, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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SOCK_STREAM, INET6_ADDRSTRLEN,
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#include <inttypes.h> /* PRIu16 */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
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#include <assert.h> /* assert() */
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#include <errno.h> /* perror(), errno */
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#include <time.h> /* time() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
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#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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argp_parse(), ARGP_KEY_ARG,
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ARGP_KEY_END, ARGP_ERR_UNKNOWN */
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/* All Avahi types, constants and functions
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#include <avahi-core/core.h>
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#include <avahi-core/lookup.h>
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#include <avahi-core/log.h>
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80
#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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/* Mandos client part */
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#include <sys/types.h> /* socket(), inet_pton() */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton() */
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#include <gnutls/gnutls.h> /* All GnuTLS stuff */
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#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
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init_gnutls_session(),
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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#include <unistd.h> /* close() */
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#include <netinet/in.h>
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#include <stdbool.h> /* true */
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#include <string.h> /* memset */
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#include <arpa/inet.h> /* inet_pton() */
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#include <iso646.h> /* not */
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#include <net/if.h> /* IF_NAMESIZE */
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#include <argp.h> /* struct argp_option,
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struct argp_state, struct argp,
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#include <errno.h> /* perror() */
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#include <gpgme.h> /* All GPGME types, constants and
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GPGME_PROTOCOL_OpenPGP,
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99
#define BUFFER_SIZE 256
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101
bool debug = false;
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const char *keydir = "/conf/conf.d/mandos";
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const char *argp_program_version = "mandosclient 0.9";
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static const char *keydir = "/conf/conf.d/mandos";
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "password-request 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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const char mandos_protocol_version[] = "1";
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/* Used for passing in values through all the callback functions */
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/* Used for passing in values through the Avahi callback functions */
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AvahiSimplePoll *simple_poll;
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AvahiServer *server;
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fprintf(stderr, "Unsupported algorithm: %s\n",
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result->unsupported_algorithm);
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fprintf(stderr, "Wrong key usage: %d\n",
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fprintf(stderr, "Wrong key usage: %u\n",
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result->wrong_key_usage);
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if(result->file_name != NULL){
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fprintf(stderr, "File name: %s\n", result->file_name);
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static int init_gnutls_global(mandos_context *mc,
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const char *pubkeyfile,
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const char *seckeyfile){
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const char *pubkeyfilename,
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const char *seckeyfilename){
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fprintf(stderr, "Initializing GnuTLS\n");
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if ((ret = gnutls_global_init ())
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!= GNUTLS_E_SUCCESS) {
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ret = gnutls_global_init();
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if (ret != GNUTLS_E_SUCCESS) {
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fprintf (stderr, "GnuTLS global_init: %s\n",
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safer_gnutls_strerror(ret));
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/* OpenPGP credentials */
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if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
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!= GNUTLS_E_SUCCESS) {
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fprintf (stderr, "GnuTLS memory error: %s\n",
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gnutls_certificate_allocate_credentials(&mc->cred);
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if (ret != GNUTLS_E_SUCCESS){
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fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
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safer_gnutls_strerror(ret));
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gnutls_global_deinit ();
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fprintf(stderr, "Attempting to use OpenPGP certificate %s"
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" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
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" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
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ret = gnutls_certificate_set_openpgp_key_file
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(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
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(mc->cred, pubkeyfilename, seckeyfilename,
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GNUTLS_OPENPGP_FMT_BASE64);
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if (ret != GNUTLS_E_SUCCESS) {
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"Error[%d] while reading the OpenPGP key pair ('%s',"
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" '%s')\n", ret, pubkeyfile, seckeyfile);
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" '%s')\n", ret, pubkeyfilename, seckeyfilename);
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fprintf(stdout, "The GnuTLS error is: %s\n",
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safer_gnutls_strerror(ret));
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/* GnuTLS server initialization */
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if (ret != GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
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" %s\n", safer_gnutls_strerror(ret));
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ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
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if (ret != GNUTLS_E_SUCCESS) {
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fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
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safer_gnutls_strerror(ret));
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gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
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gnutls_certificate_free_credentials(mc->cred);
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gnutls_global_deinit();
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static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
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static int init_gnutls_session(mandos_context *mc,
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gnutls_session_t *session){
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/* GnuTLS session creation */
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ret = gnutls_init(session, GNUTLS_SERVER);
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fprintf(stderr, "Binding to interface %s\n", interface);
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memset(&to,0,sizeof(to)); /* Spurious warning */
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to.sin6_family = AF_INET6;
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memset(&to, 0, sizeof(to));
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to.in6.sin6_family = AF_INET6;
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/* It would be nice to have a way to detect if we were passed an
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IPv4 address here. Now we assume an IPv6 address. */
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ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
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ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
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perror("inet_pton");
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fprintf(stderr, "Bad address: %s\n", ip);
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to.sin6_port = htons(port); /* Spurious warning */
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to.in6.sin6_port = htons(port); /* Spurious warning */
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to.sin6_scope_id = (uint32_t)if_index;
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to.in6.sin6_scope_id = (uint32_t)if_index;
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fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
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fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
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char addrstr[INET6_ADDRSTRLEN] = "";
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if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
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if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
458
501
sizeof(addrstr)) == NULL){
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perror("inet_ntop");
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680
char ip[AVAHI_ADDRESS_STR_MAX];
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avahi_address_snprint(ip, sizeof(ip), address);
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fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
638
" port %d\n", name, host_name, ip, interface, port);
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fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
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int ret = start_mandos_communication(ip, port, interface, mc);
689
avahi_simple_poll_quit(mc->simple_poll);
700
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/* Combines file name and path and returns the malloced new
701
748
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
749
static char *combinepath(const char *first, const char *second){
751
int ret = asprintf(&tmp, "%s/%s", first, second);
710
memcpy(tmp, first, f_len); /* Spurious warning */
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
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tmp[f_len + 1 + s_len] = '\0';
731
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char *connect_to = NULL;
732
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
735
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
739
780
struct argp_option options[] = {
741
782
.doc = "Debug mode", .group = 3 },
742
783
{ .name = "connect", .key = 'c',
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
785
.doc = "Connect directly to a sepcified mandos server",
745
787
{ .name = "interface", .key = 'i',
746
788
.arg = "INTERFACE",
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
789
.doc = "Interface that Avahi will conntect through",
748
791
{ .name = "keydir", .key = 'd',
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
793
.doc = "Directory where the openpgp keyring is",
751
795
{ .name = "seckey", .key = 's',
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
797
.doc = "Secret openpgp key for gnutls authentication",
754
799
{ .name = "pubkey", .key = 'p',
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
801
.doc = "Public openpgp key for gnutls authentication",
757
803
{ .name = "dh-bits", .key = 129,
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
805
.doc = "dh-bits to use in gnutls communication",
760
807
{ .name = "priority", .key = 130,
761
808
.arg = "PRIORITY",
762
809
.doc = "GNUTLS priority", .group = 1 },
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
811
858
struct argp argp = { .options = options, .parser = parse_opt,
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
819
872
perror("combinepath");
820
873
exitcode = EXIT_FAILURE;
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
826
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
832
fprintf(stderr, "init_gnutls_global\n");
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
890
gnutls_initalized = true;
893
/* If the interface is down, bring it up */
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
exitcode = EXIT_FAILURE;
901
strcpy(network.ifr_name, interface);
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
839
923
ret = setuid(uid);
841
925
perror("setuid");
882
/* If the interface is down, bring it up */
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
887
exitcode = EXIT_FAILURE;
890
strcpy(network.ifr_name, interface); /* Spurious warning */
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
893
perror("ioctl SIOCGIFFLAGS");
894
exitcode = EXIT_FAILURE;
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
910
967
avahi_set_log_function(empty_log);