static int
proto (int sock, const char *hostname, const char *svc,
char *message, size_t len)
{
krb5_auth_context auth_context;
krb5_error_code status;
krb5_principal server;
krb5_data data;
krb5_data data_send;
krb5_ccache ccache;
krb5_creds creds;
krb5_kdc_flags flags;
krb5_principal principal;
status = krb5_auth_con_init (context, &auth_context);
if (status) {
krb5_warn (context, status, "krb5_auth_con_init");
return 1;
}
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&sock);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_auth_con_setaddr");
return 1;
}
status = krb5_sname_to_principal (context,
hostname,
svc,
KRB5_NT_SRV_HST,
&server);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_sname_to_principal");
return 1;
}
status = krb5_sendauth (context,
&auth_context,
&sock,
KF_VERSION_1,
NULL,
server,
AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn(context, status, "krb5_sendauth");
return 1;
}
if (ccache_name == NULL)
ccache_name = "";
data_send.data = (void *)remote_name;
data_send.length = strlen(remote_name) + 1;
status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_write_message");
return 1;
}
data_send.data = (void *)ccache_name;
data_send.length = strlen(ccache_name)+1;
status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_write_message");
return 1;
}
memset (&creds, 0, sizeof(creds));
status = krb5_cc_default (context, &ccache);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_cc_default");
return 1;
}
status = krb5_cc_get_principal (context, ccache, &principal);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_cc_get_principal");
return 1;
}
creds.client = principal;
status = krb5_make_principal (context,
&creds.server,
principal->realm,
KRB5_TGS_NAME,
principal->realm,
NULL);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_make_principal");
return 1;
}
creds.times.endtime = 0;
flags.i = 0;
flags.b.forwarded = 1;
flags.b.forwardable = forwardable;
status = krb5_get_forwarded_creds (context,
auth_context,
ccache,
flags.i,
hostname,
&creds,
&data);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_get_forwarded_creds");
return 1;
}
status = krb5_write_priv_message(context, auth_context, &sock, &data);
if (status) {
krb5_auth_con_free(context, auth_context);
krb5_warn (context, status, "krb5_mk_priv");
return 1;
}
krb5_data_free (&data);
status = krb5_read_priv_message(context, auth_context, &sock, &data);
krb5_auth_con_free(context, auth_context);
if (status) {
krb5_warn (context, status, "krb5_mk_priv");
return 1;
}
if(data.length >= len) {
krb5_warnx (context, "returned string is too long, truncating");
memcpy(message, data.data, len);
message[len - 1] = '\0';
} else {
memcpy(message, data.data, data.length);
message[data.length] = '\0';
}
krb5_data_free (&data);
return(strcmp(message, "ok"));
}
static int
proto (int sock, const char *hostname, const char *service)
{
krb5_auth_context auth_context;
krb5_error_code status;
krb5_principal server;
krb5_data data;
krb5_data packet;
u_int32_t len, net_len;
status = krb5_auth_con_init (context, &auth_context);
if (status)
krb5_err (context, 1, status, "krb5_auth_con_init");
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&sock);
if (status)
krb5_err (context, 1, status, "krb5_auth_con_setaddrs_from_fd");
status = krb5_sname_to_principal (context,
hostname,
service,
KRB5_NT_SRV_HST,
&server);
if (status)
krb5_err (context, 1, status, "krb5_sname_to_principal");
status = krb5_sendauth (context,
&auth_context,
&sock,
VERSION,
NULL,
server,
AP_OPTS_MUTUAL_REQUIRED,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL);
if (status)
krb5_err (context, 1, status, "krb5_sendauth");
data.data = "hej";
data.length = 3;
krb5_data_zero (&packet);
status = krb5_mk_safe (context,
auth_context,
&data,
&packet,
NULL);
if (status)
krb5_err (context, 1, status, "krb5_mk_safe");
len = packet.length;
net_len = htonl(len);
if (krb5_net_write (context, &sock, &net_len, 4) != 4)
err (1, "krb5_net_write");
if (krb5_net_write (context, &sock, packet.data, len) != len)
err (1, "krb5_net_write");
data.data = "hemligt";
data.length = 7;
krb5_data_free (&packet);
status = krb5_mk_priv (context,
auth_context,
&data,
&packet,
NULL);
if (status)
krb5_err (context, 1, status, "krb5_mk_priv");
len = packet.length;
net_len = htonl(len);
if (krb5_net_write (context, &sock, &net_len, 4) != 4)
err (1, "krb5_net_write");
if (krb5_net_write (context, &sock, packet.data, len) != len)
err (1, "krb5_net_write");
return 0;
}
void
kerberos5_is(Authenticator *ap, unsigned char *data, int cnt)
{
krb5_error_code ret;
krb5_data outbuf;
krb5_keyblock *key_block;
char *name;
krb5_principal server;
krb5_authenticator authenticator;
int zero = 0;
if (cnt-- < 1)
return;
switch (*data++) {
case KRB_AUTH:
auth.data = (char *)data;
auth.length = cnt;
auth_context = NULL;
ret = krb5_auth_con_init (context, &auth_context);
if (ret) {
Data(ap, KRB_REJECT, "krb5_auth_con_init failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
ret = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&zero);
if (ret) {
Data(ap, KRB_REJECT, "krb5_auth_con_setaddrs_from_fd failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
ret = krb5_sock_to_principal (context,
0,
"host",
KRB5_NT_SRV_HST,
&server);
if (ret) {
Data(ap, KRB_REJECT, "krb5_sock_to_principal failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_sock_to_principal failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
ret = krb5_rd_req(context,
&auth_context,
&auth,
server,
NULL,
NULL,
&ticket);
krb5_free_principal (context, server);
if (ret) {
char *errbuf;
asprintf(&errbuf,
"Read req failed: %s",
krb5_get_err_text(context, ret));
Data(ap, KRB_REJECT, errbuf, -1);
if (auth_debug_mode)
printf("%s\r\n", errbuf);
free (errbuf);
return;
}
ret = krb5_auth_con_getkey(context, auth_context, &key_block);
if (ret) {
Data(ap, KRB_REJECT, "krb5_auth_con_getkey failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_auth_con_getkey failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
ret = krb5_auth_getauthenticator (context,
auth_context,
&authenticator);
if (ret) {
Data(ap, KRB_REJECT, "krb5_auth_getauthenticator failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_auth_getauthenticator failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
if (authenticator->cksum) {
char foo[2];
foo[0] = ap->type;
foo[1] = ap->way;
ret = krb5_verify_checksum (context,
foo,
sizeof(foo),
key_block,
authenticator->cksum);
if (ret) {
Data(ap, KRB_REJECT, "No checksum", -1);
if (auth_debug_mode)
printf ("No checksum\r\n");
krb5_free_authenticator (context,
&authenticator);
return;
}
}
krb5_free_authenticator (context,
&authenticator);
ret = krb5_auth_con_getremotesubkey (context,
auth_context,
&key_block);
if (ret) {
Data(ap, KRB_REJECT, "krb5_auth_con_getremotesubkey failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_auth_con_getremotesubkey failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
ret = krb5_mk_rep(context, &auth_context, &outbuf);
if (ret) {
Data(ap, KRB_REJECT,
"krb5_mk_rep failed", -1);
auth_finished(ap, AUTH_REJECT);
if (auth_debug_mode)
printf("Kerberos V5: "
"krb5_mk_rep failed (%s)\r\n",
krb5_get_err_text(context, ret));
return;
}
Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
}
if (krb5_unparse_name(context, ticket->client, &name))
name = 0;
if(UserNameRequested && krb5_kuserok(context,
ticket->client,
UserNameRequested)) {
Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
if (auth_debug_mode) {
printf("Kerberos5 identifies him as ``%s''\r\n",
name ? name : "");
}
if(key_block->keytype == KEYTYPE_DES) {
Session_Key skey;
skey.type = SK_DES;
skey.length = 8;
skey.data = key_block->keyvalue.data;
encrypt_session_key(&skey, 0);
}
} else {
char *msg;
asprintf (&msg, "user `%s' is not authorized to "
"login as `%s'",
name ? name : "<unknown>",
UserNameRequested ? UserNameRequested : "<nobody>");
if (msg == NULL)
Data(ap, KRB_REJECT, NULL, 0);
else {
Data(ap, KRB_REJECT, (void *)msg, -1);
free(msg);
}
}
auth_finished(ap, AUTH_USER);
krb5_free_keyblock_contents(context, key_block);
break;
#ifdef FORWARD
case KRB_FORWARD: {
struct passwd *pwd;
char ccname[1024]; /* XXX */
krb5_data inbuf;
krb5_ccache ccache;
inbuf.data = (char *)data;
inbuf.length = cnt;
pwd = getpwnam (UserNameRequested);
if (pwd == NULL)
break;
snprintf (ccname, sizeof(ccname),
"FILE:/tmp/krb5cc_%u", pwd->pw_uid);
ret = krb5_cc_resolve (context, ccname, &ccache);
if (ret) {
if (auth_debug_mode)
printf ("Kerberos V5: could not get ccache: %s\r\n",
krb5_get_err_text(context, ret));
break;
}
ret = krb5_cc_initialize (context,
ccache,
ticket->client);
if (ret) {
if (auth_debug_mode)
printf ("Kerberos V5: could not init ccache: %s\r\n",
krb5_get_err_text(context, ret));
break;
}
ret = krb5_rd_cred (context,
auth_context,
ccache,
&inbuf);
if(ret) {
char *errbuf;
asprintf (&errbuf,
"Read forwarded creds failed: %s",
krb5_get_err_text (context, ret));
if(errbuf == NULL)
Data(ap, KRB_FORWARD_REJECT, NULL, 0);
else
Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
if (auth_debug_mode)
printf("Could not read forwarded credentials: %s\r\n",
errbuf);
free (errbuf);
} else
Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
chown (ccname + 5, pwd->pw_uid, -1);
if (auth_debug_mode)
printf("Forwarded credentials obtained\r\n");
break;
}
#endif /* FORWARD */
default:
if (auth_debug_mode)
printf("Unknown Kerberos option %d\r\n", data[-1]);
Data(ap, KRB_REJECT, 0, 0);
break;
}
}
static int
proto (int sock, const char *service)
{
krb5_auth_context auth_context;
krb5_error_code status;
krb5_principal server;
krb5_ticket *ticket;
char *name;
char hostname[MAXHOSTNAMELEN];
krb5_data packet;
krb5_data data;
u_int32_t len, net_len;
ssize_t n;
status = krb5_auth_con_init (context, &auth_context);
if (status)
krb5_err (context, 1, status, "krb5_auth_con_init");
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&sock);
if (status)
krb5_err (context, 1, status, "krb5_auth_con_setaddrs_from_fd");
if(gethostname (hostname, sizeof(hostname)) < 0)
krb5_err (context, 1, errno, "gethostname");
status = krb5_sname_to_principal (context,
hostname,
service,
KRB5_NT_SRV_HST,
&server);
if (status)
krb5_err (context, 1, status, "krb5_sname_to_principal");
status = krb5_recvauth (context,
&auth_context,
&sock,
VERSION,
server,
0,
NULL,
&ticket);
if (status)
krb5_err (context, 1, status, "krb5_recvauth");
status = krb5_unparse_name (context,
ticket->client,
&name);
if (status)
krb5_err (context, 1, status, "krb5_unparse_name");
fprintf (stderr, "User is `%s'\n", name);
free (name);
krb5_data_zero (&data);
krb5_data_zero (&packet);
n = krb5_net_read (context, &sock, &net_len, 4);
if (n == 0)
krb5_errx (context, 1, "EOF in krb5_net_read");
if (n < 0)
krb5_err (context, 1, errno, "krb5_net_read");
len = ntohl(net_len);
krb5_data_alloc (&packet, len);
n = krb5_net_read (context, &sock, packet.data, len);
if (n == 0)
krb5_errx (context, 1, "EOF in krb5_net_read");
if (n < 0)
krb5_err (context, 1, errno, "krb5_net_read");
status = krb5_rd_safe (context,
auth_context,
&packet,
&data,
NULL);
if (status)
krb5_err (context, 1, status, "krb5_rd_safe");
fprintf (stderr, "safe packet: %.*s\n", (int)data.length,
(char *)data.data);
n = krb5_net_read (context, &sock, &net_len, 4);
if (n == 0)
krb5_errx (context, 1, "EOF in krb5_net_read");
if (n < 0)
krb5_err (context, 1, errno, "krb5_net_read");
len = ntohl(net_len);
krb5_data_alloc (&packet, len);
n = krb5_net_read (context, &sock, packet.data, len);
if (n == 0)
krb5_errx (context, 1, "EOF in krb5_net_read");
if (n < 0)
krb5_err (context, 1, errno, "krb5_net_read");
status = krb5_rd_priv (context,
auth_context,
&packet,
&data,
NULL);
if (status)
krb5_err (context, 1, status, "krb5_rd_priv");
fprintf (stderr, "priv packet: %.*s\n", (int)data.length,
(char *)data.data);
return 0;
}
/**
* Perform the server side of the sendauth protocol like krb5_recvauth(), but support
* a user-specified callback, \a match_appl_version, to perform the match of the application
* version \a match_data.
*/
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_recvauth_match_version(krb5_context context,
krb5_auth_context *auth_context,
krb5_pointer p_fd,
krb5_boolean (*match_appl_version)(const void *,
const char*),
const void *match_data,
krb5_principal server,
int32_t flags,
krb5_keytab keytab,
krb5_ticket **ticket)
{
krb5_error_code ret;
const char *version = KRB5_SENDAUTH_VERSION;
char her_version[sizeof(KRB5_SENDAUTH_VERSION)];
char *her_appl_version;
uint32_t len;
u_char repl;
krb5_data data;
krb5_flags ap_options;
ssize_t n;
/*
* If there are no addresses in auth_context, get them from `fd'.
*/
if (*auth_context == NULL) {
ret = krb5_auth_con_init (context, auth_context);
if (ret)
return ret;
}
ret = krb5_auth_con_setaddrs_from_fd (context,
*auth_context,
p_fd);
if (ret)
return ret;
/*
* Expect SENDAUTH protocol version.
*/
if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) {
n = krb5_net_read (context, p_fd, &len, 4);
if (n < 0) {
ret = errno;
krb5_set_error_message(context, ret, "read: %s", strerror(ret));
return ret;
}
if (n == 0) {
krb5_set_error_message(context, KRB5_SENDAUTH_BADAUTHVERS,
N_("Failed to receive sendauth data", ""));
return KRB5_SENDAUTH_BADAUTHVERS;
}
len = ntohl(len);
if (len != sizeof(her_version)
|| krb5_net_read (context, p_fd, her_version, len) != len
|| strncmp (version, her_version, len)) {
repl = 1;
krb5_net_write (context, p_fd, &repl, 1);
krb5_clear_error_message (context);
return KRB5_SENDAUTH_BADAUTHVERS;
}
}
/*
* Expect application protocol version.
*/
n = krb5_net_read (context, p_fd, &len, 4);
if (n < 0) {
ret = errno;
krb5_set_error_message(context, ret, "read: %s", strerror(ret));
return ret;
}
if (n == 0) {
krb5_clear_error_message (context);
return KRB5_SENDAUTH_BADAPPLVERS;
}
len = ntohl(len);
her_appl_version = malloc (len);
if (her_appl_version == NULL) {
repl = 2;
krb5_net_write (context, p_fd, &repl, 1);
krb5_set_error_message(context, ENOMEM,
N_("malloc: out of memory", ""));
return ENOMEM;
}
if (krb5_net_read (context, p_fd, her_appl_version, len) != len
|| !(*match_appl_version)(match_data, her_appl_version)) {
repl = 2;
krb5_net_write (context, p_fd, &repl, 1);
krb5_set_error_message(context, KRB5_SENDAUTH_BADAPPLVERS,
N_("wrong sendauth application version (%s)", ""),
her_appl_version);
free (her_appl_version);
return KRB5_SENDAUTH_BADAPPLVERS;
}
free (her_appl_version);
/*
* Send OK.
*/
repl = 0;
if (krb5_net_write (context, p_fd, &repl, 1) != 1) {
ret = errno;
krb5_set_error_message(context, ret, "write: %s", strerror(ret));
return ret;
}
/*
* Until here, the fields in the message were in cleartext and unauthenticated.
* From now on, Kerberos kicks in.
*/
/*
* Expect AP_REQ.
*/
krb5_data_zero (&data);
ret = krb5_read_message (context, p_fd, &data);
if (ret)
return ret;
ret = krb5_rd_req (context,
auth_context,
&data,
server,
keytab,
&ap_options,
ticket);
krb5_data_free (&data);
if (ret) {
krb5_data error_data;
krb5_error_code ret2;
ret2 = krb5_mk_error (context,
ret,
NULL,
NULL,
NULL,
server,
NULL,
NULL,
&error_data);
if (ret2 == 0) {
krb5_write_message (context, p_fd, &error_data);
krb5_data_free (&error_data);
}
return ret;
}
/*
* Send OK.
*/
len = 0;
if (krb5_net_write (context, p_fd, &len, 4) != 4) {
ret = errno;
krb5_set_error_message(context, ret, "write: %s", strerror(ret));
krb5_free_ticket(context, *ticket);
*ticket = NULL;
return ret;
}
/*
* If client requires mutual authentication, send AP_REP.
*/
if (ap_options & AP_OPTS_MUTUAL_REQUIRED) {
ret = krb5_mk_rep (context, *auth_context, &data);
if (ret) {
krb5_free_ticket(context, *ticket);
*ticket = NULL;
return ret;
}
ret = krb5_write_message (context, p_fd, &data);
if (ret) {
krb5_free_ticket(context, *ticket);
*ticket = NULL;
return ret;
}
krb5_data_free (&data);
}
return 0;
}
static int
kerberos5_send(char *name, Authenticator *ap)
{
krb5_error_code ret;
krb5_ccache ccache;
int ap_opts;
krb5_data cksum_data;
char foo[2];
if(check_krb5_tickets() != 1)
return 0;
if (!UserNameRequested) {
if (auth_debug_mode) {
printf("Kerberos V5: no user name supplied\r\n");
}
return(0);
}
ret = krb5_cc_default(context, &ccache);
if (ret) {
if (auth_debug_mode) {
printf("Kerberos V5: could not get default ccache: %s\r\n",
krb5_get_err_text (context, ret));
}
return 0;
}
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
ap_opts = AP_OPTS_MUTUAL_REQUIRED;
else
ap_opts = 0;
ap_opts |= AP_OPTS_USE_SUBKEY;
ret = krb5_auth_con_init (context, &auth_context);
if (ret) {
if (auth_debug_mode) {
printf("Kerberos V5: krb5_auth_con_init failed (%s)\r\n",
krb5_get_err_text(context, ret));
}
return(0);
}
ret = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&net);
if (ret) {
if (auth_debug_mode) {
printf ("Kerberos V5:"
" krb5_auth_con_setaddrs_from_fd failed (%s)\r\n",
krb5_get_err_text(context, ret));
}
return(0);
}
krb5_auth_con_setkeytype (context, auth_context, KEYTYPE_DES);
foo[0] = ap->type;
foo[1] = ap->way;
cksum_data.length = sizeof(foo);
cksum_data.data = foo;
{
krb5_principal service;
char sname[128];
ret = krb5_sname_to_principal (context,
RemoteHostName,
NULL,
KRB5_NT_SRV_HST,
&service);
if(ret) {
if (auth_debug_mode) {
printf ("Kerberos V5:"
" krb5_sname_to_principal(%s) failed (%s)\r\n",
RemoteHostName, krb5_get_err_text(context, ret));
}
return 0;
}
ret = krb5_unparse_name_fixed(context, service, sname, sizeof(sname));
if(ret) {
if (auth_debug_mode) {
printf ("Kerberos V5:"
" krb5_unparse_name_fixed failed (%s)\r\n",
krb5_get_err_text(context, ret));
}
return 0;
}
printf("[ Trying %s (%s)... ]\r\n", name, sname);
ret = krb5_mk_req_exact(context, &auth_context, ap_opts,
service,
&cksum_data, ccache, &auth);
krb5_free_principal (context, service);
}
if (ret) {
if (1 || auth_debug_mode) {
printf("Kerberos V5: mk_req failed (%s)\r\n",
krb5_get_err_text(context, ret));
}
return(0);
}
if (!auth_sendname((unsigned char *)UserNameRequested,
strlen(UserNameRequested))) {
if (auth_debug_mode)
printf("Not enough room for user name\r\n");
return(0);
}
if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
if (auth_debug_mode)
printf("Not enough room for authentication data\r\n");
return(0);
}
if (auth_debug_mode) {
printf("Sent Kerberos V5 credentials to server\r\n");
}
return(1);
}
static int
proto (int sock, const char *svc)
{
krb5_auth_context auth_context;
krb5_error_code status;
krb5_principal server;
krb5_ticket *ticket;
char *name;
char ret_string[10];
char hostname[MAXHOSTNAMELEN];
krb5_data data;
krb5_data remotename;
krb5_data tk_file;
krb5_ccache ccache;
char ccname[MAXPATHLEN];
struct passwd *pwd;
status = krb5_auth_con_init (context, &auth_context);
if (status)
krb5_err(context, 1, status, "krb5_auth_con_init");
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&sock);
if (status)
krb5_err(context, 1, status, "krb5_auth_con_setaddr");
if(gethostname (hostname, sizeof(hostname)) < 0)
krb5_err(context, 1, errno, "gethostname");
status = krb5_sname_to_principal (context,
hostname,
svc,
KRB5_NT_SRV_HST,
&server);
if (status)
krb5_err(context, 1, status, "krb5_sname_to_principal");
status = krb5_recvauth_match_version (context,
&auth_context,
&sock,
kfd_match_version,
NULL,
server,
0,
NULL,
&ticket);
if (status)
krb5_err(context, 1, status, "krb5_recvauth");
status = krb5_unparse_name (context,
ticket->client,
&name);
if (status)
krb5_err(context, 1, status, "krb5_unparse_name");
if(protocol_version == 0) {
data.data = "old clnt"; /* XXX old clients only had room for
10 bytes of message, and also
didn't show it to the user */
data.length = strlen(data.data) + 1;
krb5_write_message(context, &sock, &data);
sleep(2); /* XXX give client time to finish */
krb5_errx(context, 1, "old client; exiting");
}
status=krb5_read_priv_message (context, auth_context,
&sock, &remotename);
if (status)
krb5_err(context, 1, status, "krb5_read_message");
status=krb5_read_priv_message (context, auth_context,
&sock, &tk_file);
if (status)
krb5_err(context, 1, status, "krb5_read_message");
krb5_data_zero (&data);
if(((char*)remotename.data)[remotename.length-1] != '\0')
krb5_errx(context, 1, "unterminated received");
if(((char*)tk_file.data)[tk_file.length-1] != '\0')
krb5_errx(context, 1, "unterminated received");
status = krb5_read_priv_message(context, auth_context, &sock, &data);
if (status) {
krb5_err(context, 1, errno, "krb5_read_priv_message");
goto out;
}
pwd = getpwnam ((char *)(remotename.data));
if (pwd == NULL) {
status=1;
krb5_warnx(context, "getpwnam: %s failed",(char *)(remotename.data));
goto out;
}
if(!krb5_kuserok (context,
ticket->client,
(char *)(remotename.data))) {
status=1;
krb5_warnx(context, "krb5_kuserok: permission denied");
goto out;
}
if (setgid(pwd->pw_gid) < 0) {
krb5_warn(context, errno, "setgid");
goto out;
}
if (setuid(pwd->pw_uid) < 0) {
krb5_warn(context, errno, "setuid");
goto out;
}
if (tk_file.length != 1)
snprintf (ccname, sizeof(ccname), "%s", (char *)(tk_file.data));
else
snprintf (ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%lu",
(unsigned long)pwd->pw_uid);
status = krb5_cc_resolve (context, ccname, &ccache);
if (status) {
krb5_warn(context, status, "krb5_cc_resolve");
goto out;
}
status = krb5_cc_initialize (context, ccache, ticket->client);
if (status) {
krb5_warn(context, status, "krb5_cc_initialize");
goto out;
}
status = krb5_rd_cred2 (context, auth_context, ccache, &data);
krb5_cc_close (context, ccache);
if (status) {
krb5_warn(context, status, "krb5_rd_cred");
goto out;
}
strlcpy(krb5_tkfile,ccname,sizeof(krb5_tkfile));
krb5_warnx(context, "%s forwarded ticket to %s,%s",
name,
(char *)(remotename.data),ccname);
out:
if (status) {
strlcpy(ret_string, "no", sizeof(ret_string));
krb5_warnx(context, "failed");
} else {
strlcpy(ret_string, "ok", sizeof(ret_string));
}
krb5_data_free (&tk_file);
krb5_data_free (&remotename);
krb5_data_free (&data);
free(name);
data.data = ret_string;
data.length = strlen(ret_string) + 1;
status = krb5_write_priv_message(context, auth_context, &sock, &data);
krb5_auth_con_free(context, auth_context);
return status;
}
/*
* Try krb5 authentication. server_user is passed for logging purposes
* only, in auth is received ticket, in client is returned principal
* from the ticket
*/
int
auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *reply)
{
krb5_error_code problem;
krb5_principal server;
krb5_ticket *ticket;
int fd, ret;
const char *errtxt;
ret = 0;
server = NULL;
ticket = NULL;
reply->length = 0;
problem = krb5_init(authctxt);
if (problem)
goto err;
problem = krb5_auth_con_init(authctxt->krb5_ctx,
&authctxt->krb5_auth_ctx);
if (problem)
goto err;
fd = packet_get_connection_in();
problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
authctxt->krb5_auth_ctx, &fd);
if (problem)
goto err;
problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
KRB5_NT_SRV_HST, &server);
if (problem)
goto err;
problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
auth, server, NULL, NULL, &ticket);
if (problem)
goto err;
problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
&authctxt->krb5_user);
if (problem)
goto err;
/* if client wants mutual auth */
problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
reply);
if (problem)
goto err;
/* Check .k5login authorization now. */
if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
authctxt->pw->pw_name))
goto err;
if (client)
krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
client);
ret = 1;
err:
if (server)
krb5_free_principal(authctxt->krb5_ctx, server);
if (ticket)
krb5_free_ticket(authctxt->krb5_ctx, ticket);
if (!ret && reply->length) {
free(reply->data);
memset(reply, 0, sizeof(*reply));
}
if (problem) {
errtxt = NULL;
if (authctxt->krb5_ctx != NULL)
errtxt = krb5_get_error_message(authctxt->krb5_ctx,
problem);
if (errtxt != NULL) {
debug("Kerberos v5 authentication failed: %s", errtxt);
krb5_free_error_message(authctxt->krb5_ctx, errtxt);
} else
debug("Kerberos v5 authentication failed: %d",
problem);
}
return (ret);
}
static int
send_krb5_auth(int s,
struct sockaddr *thisaddr,
struct sockaddr *thataddr,
const char *hostname,
const char *remote_user,
const char *local_user,
size_t cmd_len,
const char *cmd)
{
krb5_principal server;
krb5_data cksum_data;
int status;
size_t len;
krb5_auth_context auth_context = NULL;
const char *protocol_string = NULL;
krb5_flags ap_opts;
char *str;
status = krb5_sname_to_principal(context,
hostname,
"host",
KRB5_NT_SRV_HST,
&server);
if (status) {
warnx ("%s: %s", hostname, krb5_get_err_text(context, status));
return 1;
}
if(do_encrypt == -1) {
krb5_appdefault_boolean(context, NULL,
krb5_principal_get_realm(context, server),
"encrypt",
FALSE,
&do_encrypt);
}
cksum_data.length = asprintf (&str,
"%u:%s%s%s",
ntohs(socket_get_port(thataddr)),
do_encrypt ? "-x " : "",
cmd,
remote_user);
if (str == NULL) {
warnx ("%s: failed to allocate command", hostname);
return 1;
}
cksum_data.data = str;
ap_opts = 0;
if(do_encrypt)
ap_opts |= AP_OPTS_MUTUAL_REQUIRED;
switch(protocol_version) {
case 2:
ap_opts |= AP_OPTS_USE_SUBKEY;
protocol_string = KCMD_NEW_VERSION;
break;
case 1:
protocol_string = KCMD_OLD_VERSION;
key_usage = KRB5_KU_OTHER_ENCRYPTED;
break;
default:
abort();
}
status = krb5_sendauth (context,
&auth_context,
&s,
protocol_string,
NULL,
server,
ap_opts,
&cksum_data,
NULL,
NULL,
NULL,
NULL,
NULL);
/* do this while we have a principal */
if(do_forward == -1 || do_forwardable == -1) {
krb5_const_realm realm = krb5_principal_get_realm(context, server);
if (do_forwardable == -1)
krb5_appdefault_boolean(context, NULL, realm,
"forwardable", FALSE,
&do_forwardable);
if (do_forward == -1)
krb5_appdefault_boolean(context, NULL, realm,
"forward", FALSE,
&do_forward);
}
krb5_free_principal(context, server);
krb5_data_free(&cksum_data);
if (status) {
if(status == KRB5_SENDAUTH_REJECTED &&
protocol_version == 2 && protocol_version_str == NULL)
sendauth_version_error = 1;
else
krb5_warn(context, status, "%s", hostname);
return 1;
}
status = krb5_auth_con_getlocalsubkey (context, auth_context, &keyblock);
if(keyblock == NULL)
status = krb5_auth_con_getkey (context, auth_context, &keyblock);
if (status) {
warnx ("krb5_auth_con_getkey: %s", krb5_get_err_text(context, status));
return 1;
}
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&s);
if (status) {
warnx("krb5_auth_con_setaddrs_from_fd: %s",
krb5_get_err_text(context, status));
return(1);
}
status = krb5_crypto_init(context, keyblock, 0, &crypto);
if(status) {
warnx ("krb5_crypto_init: %s", krb5_get_err_text(context, status));
return 1;
}
len = strlen(remote_user) + 1;
if (net_write (s, remote_user, len) != len) {
warn ("write");
return 1;
}
if (do_encrypt && net_write (s, "-x ", 3) != 3) {
warn ("write");
return 1;
}
if (net_write (s, cmd, cmd_len) != cmd_len) {
warn ("write");
return 1;
}
if (do_unique_tkfile) {
if (net_write (s, tkfile, strlen(tkfile)) != strlen(tkfile)) {
warn ("write");
return 1;
}
}
len = strlen(local_user) + 1;
if (net_write (s, local_user, len) != len) {
warn ("write");
return 1;
}
if (!do_forward
|| krb5_forward_cred (auth_context, s, hostname, do_forwardable)) {
/* Empty forwarding info */
u_char zero[4] = {0, 0, 0, 0};
write (s, &zero, 4);
}
krb5_auth_con_free (context, auth_context);
return 0;
}
/*
* Try krb5 authentication. server_user is passed for logging purposes
* only, in auth is received ticket, in client is returned principal
* from the ticket
*/
int
auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client)
{
krb5_error_code problem;
krb5_principal server;
krb5_data reply;
krb5_ticket *ticket;
int fd, ret;
ret = 0;
server = NULL;
ticket = NULL;
reply.length = 0;
problem = krb5_init(authctxt);
if (problem)
goto err;
problem = krb5_auth_con_init(authctxt->krb5_ctx,
&authctxt->krb5_auth_ctx);
if (problem)
goto err;
fd = packet_get_connection_in();
#ifdef HEIMDAL
problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
authctxt->krb5_auth_ctx, &fd);
#else
problem = krb5_auth_con_genaddrs(authctxt->krb5_ctx,
authctxt->krb5_auth_ctx,fd,
KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR |
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR);
#endif
if (problem)
goto err;
problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL ,
KRB5_NT_SRV_HST, &server);
if (problem)
goto err;
problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
auth, server, NULL, NULL, &ticket);
if (problem)
goto err;
#ifdef HEIMDAL
problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
&authctxt->krb5_user);
#else
problem = krb5_copy_principal(authctxt->krb5_ctx,
ticket->enc_part2->client,
&authctxt->krb5_user);
#endif
if (problem)
goto err;
/* if client wants mutual auth */
problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
&reply);
if (problem)
goto err;
/* Check .k5login authorization now. */
if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
authctxt->pw->pw_name))
goto err;
if (client)
krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
client);
packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
packet_put_string((char *) reply.data, reply.length);
packet_send();
packet_write_wait();
ret = 1;
err:
if (server)
krb5_free_principal(authctxt->krb5_ctx, server);
if (ticket)
krb5_free_ticket(authctxt->krb5_ctx, ticket);
if (reply.length)
xfree(reply.data);
if (problem) {
if (authctxt->krb5_ctx != NULL)
debug("Kerberos v5 authentication failed: %s",
krb5_get_err_text(authctxt->krb5_ctx, problem));
else
debug("Kerberos v5 authentication failed: %d",
problem);
}
return (ret);
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_recvauth_match_version(krb5_context context,
krb5_auth_context *auth_context,
krb5_pointer p_fd,
krb5_boolean (*match_appl_version)(const void *,
const char*),
const void *match_data,
krb5_principal server,
int32_t flags,
krb5_keytab keytab,
krb5_ticket **ticket)
{
krb5_error_code ret;
const char *version = KRB5_SENDAUTH_VERSION;
char her_version[sizeof(KRB5_SENDAUTH_VERSION)];
char *her_appl_version;
u_int32_t len;
u_char repl;
krb5_data data;
krb5_flags ap_options;
ssize_t n;
/*
* If there are no addresses in auth_context, get them from `fd'.
*/
if (*auth_context == NULL) {
ret = krb5_auth_con_init (context, auth_context);
if (ret)
return ret;
}
ret = krb5_auth_con_setaddrs_from_fd (context,
*auth_context,
p_fd);
if (ret)
return ret;
if(!(flags & KRB5_RECVAUTH_IGNORE_VERSION)) {
n = krb5_net_read (context, p_fd, &len, 4);
if (n < 0) {
ret = errno;
krb5_set_error_string (context, "read: %s", strerror(errno));
return ret;
}
if (n == 0) {
krb5_clear_error_string (context);
return KRB5_SENDAUTH_BADAUTHVERS;
}
len = ntohl(len);
if (len != sizeof(her_version)
|| krb5_net_read (context, p_fd, her_version, len) != len
|| strncmp (version, her_version, len)) {
repl = 1;
krb5_net_write (context, p_fd, &repl, 1);
krb5_clear_error_string (context);
return KRB5_SENDAUTH_BADAUTHVERS;
}
}
n = krb5_net_read (context, p_fd, &len, 4);
if (n < 0) {
ret = errno;
krb5_set_error_string (context, "read: %s", strerror(errno));
return ret;
}
if (n == 0) {
krb5_clear_error_string (context);
return KRB5_SENDAUTH_BADAPPLVERS;
}
len = ntohl(len);
her_appl_version = malloc (len);
if (her_appl_version == NULL) {
repl = 2;
krb5_net_write (context, p_fd, &repl, 1);
krb5_set_error_string (context, "malloc: out of memory");
return ENOMEM;
}
if (krb5_net_read (context, p_fd, her_appl_version, len) != len
|| !(*match_appl_version)(match_data, her_appl_version)) {
repl = 2;
krb5_net_write (context, p_fd, &repl, 1);
krb5_set_error_string (context, "wrong sendauth version (%s)",
her_appl_version);
free (her_appl_version);
return KRB5_SENDAUTH_BADAPPLVERS;
}
free (her_appl_version);
repl = 0;
if (krb5_net_write (context, p_fd, &repl, 1) != 1) {
ret = errno;
krb5_set_error_string (context, "write: %s", strerror(errno));
return ret;
}
krb5_data_zero (&data);
ret = krb5_read_message (context, p_fd, &data);
if (ret)
return ret;
ret = krb5_rd_req (context,
auth_context,
&data,
server,
keytab,
&ap_options,
ticket);
krb5_data_free (&data);
if (ret) {
krb5_data error_data;
krb5_error_code ret2;
ret2 = krb5_mk_error (context,
ret,
NULL,
NULL,
NULL,
server,
NULL,
NULL,
&error_data);
if (ret2 == 0) {
krb5_write_message (context, p_fd, &error_data);
krb5_data_free (&error_data);
}
return ret;
}
len = 0;
if (krb5_net_write (context, p_fd, &len, 4) != 4) {
ret = errno;
krb5_set_error_string (context, "write: %s", strerror(errno));
return ret;
}
if (ap_options & AP_OPTS_MUTUAL_REQUIRED) {
ret = krb5_mk_rep (context, *auth_context, &data);
if (ret)
return ret;
ret = krb5_write_message (context, p_fd, &data);
if (ret)
return ret;
krb5_data_free (&data);
}
return 0;
}
