static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
{
NTSTATUS nt_status;
int ret;
struct gensec_gssapi_state *gensec_gssapi_state;
struct cli_credentials *machine_account;
struct gssapi_creds_container *gcc;
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
machine_account = gensec_get_credentials(gensec_security);
if (!machine_account) {
DEBUG(3, ("No machine account credentials specified\n"));
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
} else {
ret = cli_credentials_get_server_gss_creds(machine_account,
gensec_security->settings->lp_ctx, &gcc);
if (ret) {
DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
error_message(ret)));
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
}
gensec_gssapi_state->server_cred = gcc;
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_client_creds(struct gensec_security *gensec_security,
struct tevent_context *ev)
{
struct gensec_gssapi_state *gensec_gssapi_state;
struct gssapi_creds_container *gcc;
struct cli_credentials *creds = gensec_get_credentials(gensec_security);
const char *error_string;
int ret;
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
/* Only run this the first time the update() call is made */
if (gensec_gssapi_state->client_cred) {
return NT_STATUS_OK;
}
ret = cli_credentials_get_client_gss_creds(creds,
ev,
gensec_security->settings->lp_ctx, &gcc, &error_string);
switch (ret) {
case 0:
break;
case EINVAL:
DEBUG(3, ("Cannot obtain client GSS credentials we need to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
return NT_STATUS_INVALID_PARAMETER;
case KRB5KDC_ERR_PREAUTH_FAILED:
case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
DEBUG(1, ("Wrong username or password: %s\n", error_string));
return NT_STATUS_LOGON_FAILURE;
case KRB5KDC_ERR_CLIENT_REVOKED:
DEBUG(1, ("Account locked out: %s\n", error_string));
return NT_STATUS_ACCOUNT_LOCKED_OUT;
case KRB5_REALM_UNKNOWN:
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact %s : %s\n", gensec_gssapi_state->target_principal, error_string));
return NT_STATUS_NO_LOGON_SERVERS;
case KRB5_CC_NOTFOUND:
case KRB5_CC_END:
DEBUG(2, ("Error obtaining ticket we require to contact %s: (possibly due to clock skew between us and the KDC) %s\n", gensec_gssapi_state->target_principal, error_string));
return NT_STATUS_TIME_DIFFERENCE_AT_DC;
default:
DEBUG(1, ("Aquiring initiator credentials failed: %s\n", error_string));
return NT_STATUS_UNSUCCESSFUL;
}
gensec_gssapi_state->client_cred = gcc;
if (!talloc_reference(gensec_gssapi_state, gcc)) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
static void manage_gensec_request(enum stdio_helper_mode stdio_helper_mode,
struct loadparm_context *lp_ctx,
char *buf, int length, void **private1,
unsigned int mux_id, void **private2)
{
DATA_BLOB in;
DATA_BLOB out = data_blob(NULL, 0);
char *out_base64 = NULL;
const char *reply_arg = NULL;
struct gensec_ntlm_state {
struct gensec_security *gensec_state;
const char *set_password;
};
struct gensec_ntlm_state *state;
struct tevent_context *ev;
struct imessaging_context *msg;
NTSTATUS nt_status;
bool first = false;
const char *reply_code;
struct cli_credentials *creds;
static char *want_feature_list = NULL;
static DATA_BLOB session_key;
TALLOC_CTX *mem_ctx;
if (*private1) {
state = (struct gensec_ntlm_state *)*private1;
} else {
state = talloc_zero(NULL, struct gensec_ntlm_state);
if (!state) {
mux_printf(mux_id, "BH No Memory\n");
exit(1);
}
*private1 = state;
if (opt_password) {
state->set_password = opt_password;
}
}
if (strlen(buf) < 2) {
DEBUG(1, ("query [%s] invalid", buf));
mux_printf(mux_id, "BH Query invalid\n");
return;
}
if (strlen(buf) > 3) {
if(strncmp(buf, "SF ", 3) == 0) {
DEBUG(10, ("Setting flags to negotiate\n"));
talloc_free(want_feature_list);
want_feature_list = talloc_strndup(state, buf+3, strlen(buf)-3);
mux_printf(mux_id, "OK\n");
return;
}
in = base64_decode_data_blob(buf + 3);
} else {
in = data_blob(NULL, 0);
}
if (strncmp(buf, "YR", 2) == 0) {
if (state->gensec_state) {
talloc_free(state->gensec_state);
state->gensec_state = NULL;
}
} else if ( (strncmp(buf, "OK", 2) == 0)) {
/* Just return BH, like ntlm_auth from Samba 3 does. */
mux_printf(mux_id, "BH Command expected\n");
data_blob_free(&in);
return;
} else if ( (strncmp(buf, "TT ", 3) != 0) &&
(strncmp(buf, "KK ", 3) != 0) &&
(strncmp(buf, "AF ", 3) != 0) &&
(strncmp(buf, "NA ", 3) != 0) &&
(strncmp(buf, "UG", 2) != 0) &&
(strncmp(buf, "PW ", 3) != 0) &&
(strncmp(buf, "GK", 2) != 0) &&
(strncmp(buf, "GF", 2) != 0)) {
DEBUG(1, ("SPNEGO request [%s] invalid\n", buf));
mux_printf(mux_id, "BH SPNEGO request invalid\n");
data_blob_free(&in);
return;
}
ev = s4_event_context_init(state);
if (!ev) {
exit(1);
}
mem_ctx = talloc_named(NULL, 0, "manage_gensec_request internal mem_ctx");
/* setup gensec */
if (!(state->gensec_state)) {
switch (stdio_helper_mode) {
case GSS_SPNEGO_CLIENT:
case NTLMSSP_CLIENT_1:
/* setup the client side */
nt_status = gensec_client_start(NULL, &state->gensec_state, ev,
lpcfg_gensec_settings(NULL, lp_ctx));
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
exit(1);
}
break;
case GSS_SPNEGO_SERVER:
case SQUID_2_5_NTLMSSP:
{
const char *winbind_method[] = { "winbind", NULL };
struct auth4_context *auth_context;
msg = imessaging_client_init(state, lpcfg_imessaging_path(state, lp_ctx), ev);
if (!msg) {
talloc_free(mem_ctx);
exit(1);
}
nt_status = auth_context_create_methods(mem_ctx,
winbind_method,
ev,
msg,
lp_ctx,
NULL,
&auth_context);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
exit(1);
}
if (!NT_STATUS_IS_OK(gensec_server_start(state, ev,
lpcfg_gensec_settings(state, lp_ctx),
auth_context, &state->gensec_state))) {
talloc_free(mem_ctx);
exit(1);
}
break;
}
default:
talloc_free(mem_ctx);
abort();
}
creds = cli_credentials_init(state->gensec_state);
cli_credentials_set_conf(creds, lp_ctx);
if (opt_username) {
cli_credentials_set_username(creds, opt_username, CRED_SPECIFIED);
}
if (opt_domain) {
cli_credentials_set_domain(creds, opt_domain, CRED_SPECIFIED);
}
if (state->set_password) {
cli_credentials_set_password(creds, state->set_password, CRED_SPECIFIED);
} else {
cli_credentials_set_password_callback(creds, get_password);
creds->priv_data = (void*)(uintptr_t)mux_id;
}
if (opt_workstation) {
cli_credentials_set_workstation(creds, opt_workstation, CRED_SPECIFIED);
}
switch (stdio_helper_mode) {
case GSS_SPNEGO_SERVER:
case SQUID_2_5_NTLMSSP:
cli_credentials_set_machine_account(creds, lp_ctx);
break;
default:
break;
}
gensec_set_credentials(state->gensec_state, creds);
gensec_want_feature_list(state->gensec_state, want_feature_list);
switch (stdio_helper_mode) {
case GSS_SPNEGO_CLIENT:
case GSS_SPNEGO_SERVER:
nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_SPNEGO);
if (!in.length) {
first = true;
}
break;
case NTLMSSP_CLIENT_1:
if (!in.length) {
first = true;
}
/* fall through */
case SQUID_2_5_NTLMSSP:
nt_status = gensec_start_mech_by_oid(state->gensec_state, GENSEC_OID_NTLMSSP);
break;
default:
talloc_free(mem_ctx);
abort();
}
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("GENSEC mech failed to start: %s\n", nt_errstr(nt_status)));
mux_printf(mux_id, "BH GENSEC mech failed to start\n");
talloc_free(mem_ctx);
return;
}
}
/* update */
if (strncmp(buf, "PW ", 3) == 0) {
state->set_password = talloc_strndup(state,
(const char *)in.data,
in.length);
cli_credentials_set_password(gensec_get_credentials(state->gensec_state),
state->set_password,
CRED_SPECIFIED);
mux_printf(mux_id, "OK\n");
data_blob_free(&in);
talloc_free(mem_ctx);
return;
}
if (strncmp(buf, "UG", 2) == 0) {
int i;
char *grouplist = NULL;
struct auth_session_info *session_info;
nt_status = gensec_session_info(state->gensec_state, mem_ctx, &session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("gensec_session_info failed: %s\n", nt_errstr(nt_status)));
mux_printf(mux_id, "BH %s\n", nt_errstr(nt_status));
data_blob_free(&in);
talloc_free(mem_ctx);
return;
}
/* get the string onto the context */
grouplist = talloc_strdup(mem_ctx, "");
for (i=0; i<session_info->security_token->num_sids; i++) {
struct security_token *token = session_info->security_token;
const char *sidstr = dom_sid_string(session_info,
&token->sids[i]);
grouplist = talloc_asprintf_append_buffer(grouplist, "%s,", sidstr);
}
mux_printf(mux_id, "GL %s\n", grouplist);
talloc_free(session_info);
data_blob_free(&in);
talloc_free(mem_ctx);
return;
}
if (strncmp(buf, "GK", 2) == 0) {
char *base64_key;
DEBUG(10, ("Requested session key\n"));
nt_status = gensec_session_key(state->gensec_state, mem_ctx, &session_key);
if(!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("gensec_session_key failed: %s\n", nt_errstr(nt_status)));
mux_printf(mux_id, "BH No session key\n");
talloc_free(mem_ctx);
return;
} else {
base64_key = base64_encode_data_blob(state, session_key);
mux_printf(mux_id, "GK %s\n", base64_key);
talloc_free(base64_key);
}
talloc_free(mem_ctx);
return;
}
if (strncmp(buf, "GF", 2) == 0) {
struct ntlmssp_state *ntlmssp_state;
uint32_t neg_flags;
ntlmssp_state = talloc_get_type(state->gensec_state->private_data,
struct ntlmssp_state);
neg_flags = ntlmssp_state->neg_flags;
DEBUG(10, ("Requested negotiated feature flags\n"));
mux_printf(mux_id, "GF 0x%08x\n", neg_flags);
return;
}
nt_status = gensec_update(state->gensec_state, mem_ctx, in, &out);
/* don't leak 'bad password'/'no such user' info to the network client */
nt_status = nt_status_squash(nt_status);
if (out.length) {
out_base64 = base64_encode_data_blob(mem_ctx, out);
} else {
out_base64 = NULL;
}
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
reply_arg = "*";
if (first) {
reply_code = "YR";
} else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
reply_code = "KK";
} else if (state->gensec_state->gensec_role == GENSEC_SERVER) {
reply_code = "TT";
} else {
abort();
}
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) {
reply_code = "BH NT_STATUS_ACCESS_DENIED";
reply_arg = nt_errstr(nt_status);
DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) {
reply_code = "BH NT_STATUS_UNSUCCESSFUL";
reply_arg = nt_errstr(nt_status);
DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
} else if (!NT_STATUS_IS_OK(nt_status)) {
reply_code = "NA";
reply_arg = nt_errstr(nt_status);
DEBUG(1, ("GENSEC login failed: %s\n", nt_errstr(nt_status)));
} else if /* OK */ (state->gensec_state->gensec_role == GENSEC_SERVER) {
struct auth_session_info *session_info;
nt_status = gensec_session_info(state->gensec_state, mem_ctx, &session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
reply_code = "BH Failed to retrive session info";
reply_arg = nt_errstr(nt_status);
DEBUG(1, ("GENSEC failed to retrieve the session info: %s\n", nt_errstr(nt_status)));
} else {
reply_code = "AF";
reply_arg = talloc_asprintf(state->gensec_state,
"%s%s%s", session_info->info->domain_name,
lpcfg_winbind_separator(lp_ctx), session_info->info->account_name);
talloc_free(session_info);
}
} else if (state->gensec_state->gensec_role == GENSEC_CLIENT) {
reply_code = "AF";
reply_arg = out_base64;
} else {
abort();
}
switch (stdio_helper_mode) {
case GSS_SPNEGO_SERVER:
mux_printf(mux_id, "%s %s %s\n", reply_code,
out_base64 ? out_base64 : "*",
reply_arg ? reply_arg : "*");
break;
default:
if (out_base64) {
mux_printf(mux_id, "%s %s\n", reply_code, out_base64);
} else if (reply_arg) {
mux_printf(mux_id, "%s %s\n", reply_code, reply_arg);
} else {
mux_printf(mux_id, "%s\n", reply_code);
}
}
talloc_free(mem_ctx);
return;
}
static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state;
struct cli_credentials *creds = gensec_get_credentials(gensec_security);
NTSTATUS nt_status;
gss_buffer_desc name_token;
gss_OID name_type;
OM_uint32 maj_stat, min_stat;
const char *hostname = gensec_get_target_hostname(gensec_security);
if (!hostname) {
DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_ipaddress(hostname)) {
DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (strcmp(hostname, "localhost") == 0) {
DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
if (cli_credentials_get_impersonate_principal(creds)) {
gensec_gssapi_state->gss_want_flags &= ~(GSS_C_DELEG_FLAG|GSS_C_DELEG_POLICY_FLAG);
}
gensec_gssapi_state->target_principal = gensec_get_target_principal(gensec_security);
if (gensec_gssapi_state->target_principal) {
name_type = GSS_C_NULL_OID;
} else {
gensec_gssapi_state->target_principal = talloc_asprintf(gensec_gssapi_state, "%s/%s@%s",
gensec_get_target_service(gensec_security),
hostname, cli_credentials_get_realm(creds));
name_type = GSS_C_NT_USER_NAME;
}
name_token.value = discard_const_p(uint8_t, gensec_gssapi_state->target_principal);
name_token.length = strlen(gensec_gssapi_state->target_principal);
maj_stat = gss_import_name (&min_stat,
&name_token,
name_type,
&gensec_gssapi_state->server_name);
if (maj_stat) {
DEBUG(2, ("GSS Import name of %s failed: %s\n",
(char *)name_token.value,
gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_INVALID_PARAMETER;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
{
krb5_error_code ret;
struct gensec_krb5_state *gensec_krb5_state;
struct cli_credentials *creds;
const struct tsocket_address *tlocal_addr, *tremote_addr;
krb5_address my_krb5_addr, peer_krb5_addr;
creds = gensec_get_credentials(gensec_security);
if (!creds) {
return NT_STATUS_INVALID_PARAMETER;
}
gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
if (!gensec_krb5_state) {
return NT_STATUS_NO_MEMORY;
}
gensec_security->private_data = gensec_krb5_state;
gensec_krb5_state->smb_krb5_context = NULL;
gensec_krb5_state->auth_context = NULL;
gensec_krb5_state->ticket = NULL;
ZERO_STRUCT(gensec_krb5_state->enc_ticket);
gensec_krb5_state->keyblock = NULL;
gensec_krb5_state->gssapi = gssapi;
talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
if (cli_credentials_get_krb5_context(creds,
gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
gensec_krb5_state->auth_context,
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
tlocal_addr = gensec_get_local_address(gensec_security);
if (tlocal_addr) {
ssize_t socklen;
struct sockaddr_storage ss;
socklen = tsocket_address_bsd_sockaddr(tlocal_addr,
(struct sockaddr *) &ss,
sizeof(struct sockaddr_storage));
if (socklen < 0) {
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
(const struct sockaddr *) &ss, &my_krb5_addr);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
}
tremote_addr = gensec_get_remote_address(gensec_security);
if (tremote_addr) {
ssize_t socklen;
struct sockaddr_storage ss;
socklen = tsocket_address_bsd_sockaddr(tremote_addr,
(struct sockaddr *) &ss,
sizeof(struct sockaddr_storage));
if (socklen < 0) {
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
(const struct sockaddr *) &ss, &peer_krb5_addr);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
}
ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
gensec_krb5_state->auth_context,
tlocal_addr ? &my_krb5_addr : NULL,
tremote_addr ? &peer_krb5_addr : NULL);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
struct tevent_context *ev,
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
krb5_error_code ret = 0;
NTSTATUS nt_status;
switch (gensec_krb5_state->state_position) {
case GENSEC_KRB5_CLIENT_START:
{
DATA_BLOB unwrapped_out;
nt_status = gensec_krb5_common_client_creds(gensec_security, ev, gensec_krb5_state->gssapi);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
if (gensec_krb5_state->gssapi) {
unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
/* wrap that up in a nice GSS-API wrapping */
*out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
} else {
*out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
}
if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
} else {
gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
nt_status = NT_STATUS_OK;
}
return nt_status;
}
case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
{
DATA_BLOB unwrapped_in;
krb5_data inbuf;
krb5_ap_rep_enc_part *repl = NULL;
uint8_t tok_id[2];
if (gensec_krb5_state->gssapi) {
if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
dump_data_pw("Mutual authentication message:\n", in.data, in.length);
return NT_STATUS_INVALID_PARAMETER;
}
} else {
unwrapped_in = in;
}
/* TODO: check the tok_id */
inbuf.data = unwrapped_in.data;
inbuf.length = unwrapped_in.length;
ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
gensec_krb5_state->auth_context,
&inbuf, &repl);
if (ret) {
DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
nt_status = NT_STATUS_ACCESS_DENIED;
} else {
*out = data_blob(NULL, 0);
nt_status = NT_STATUS_OK;
gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
}
if (repl) {
krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
}
return nt_status;
}
case GENSEC_KRB5_SERVER_START:
{
DATA_BLOB unwrapped_in;
DATA_BLOB unwrapped_out = data_blob(NULL, 0);
krb5_data inbuf, outbuf;
uint8_t tok_id[2];
struct keytab_container *keytab;
krb5_principal server_in_keytab;
const char *error_string;
enum credentials_obtained obtained;
if (!in.data) {
return NT_STATUS_INVALID_PARAMETER;
}
/* Grab the keytab, however generated */
ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
gensec_security->settings->lp_ctx, &keytab);
if (ret) {
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
/* This ensures we lookup the correct entry in that keytab */
ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
gensec_krb5_state->smb_krb5_context,
&server_in_keytab, &obtained, &error_string);
if (ret) {
DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
/* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
if (gensec_krb5_state->gssapi
&& gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
inbuf.data = unwrapped_in.data;
inbuf.length = unwrapped_in.length;
} else {
inbuf.data = in.data;
inbuf.length = in.length;
}
ret = smb_rd_req_return_stuff(gensec_krb5_state->smb_krb5_context->krb5_context,
&gensec_krb5_state->auth_context,
&inbuf, keytab->keytab, server_in_keytab,
&outbuf,
&gensec_krb5_state->ticket,
&gensec_krb5_state->keyblock);
if (ret) {
return NT_STATUS_LOGON_FAILURE;
}
unwrapped_out.data = (uint8_t *)outbuf.data;
unwrapped_out.length = outbuf.length;
gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
/* wrap that up in a nice GSS-API wrapping */
if (gensec_krb5_state->gssapi) {
*out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
} else {
*out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
}
krb5_data_free(&outbuf);
return NT_STATUS_OK;
}
case GENSEC_KRB5_DONE:
default:
/* Asking too many times... */
return NT_STATUS_INVALID_PARAMETER;
}
}
static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
struct tevent_context *ev,
bool gssapi)
{
struct gensec_krb5_state *gensec_krb5_state;
krb5_error_code ret;
struct ccache_container *ccache_container;
const char *error_string;
const char *principal;
const char *hostname;
krb5_data in_data;
struct tevent_context *previous_ev;
gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
principal = gensec_get_target_principal(gensec_security);
hostname = gensec_get_target_hostname(gensec_security);
ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
ev,
gensec_security->settings->lp_ctx, &ccache_container, &error_string);
switch (ret) {
case 0:
break;
case KRB5KDC_ERR_PREAUTH_FAILED:
case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
return NT_STATUS_LOGON_FAILURE;
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5_CC_NOTFOUND:
case KRB5_CC_END:
DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
default:
DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
return NT_STATUS_UNSUCCESSFUL;
}
in_data.length = 0;
/* Do this every time, in case we have weird recursive issues here */
ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
if (ret != 0) {
DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
return NT_STATUS_NO_MEMORY;
}
if (principal) {
krb5_principal target_principal;
ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
&target_principal);
if (ret == 0) {
ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
&gensec_krb5_state->auth_context,
gensec_krb5_state->ap_req_options,
target_principal,
&in_data, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
target_principal);
}
} else {
ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
&gensec_krb5_state->auth_context,
gensec_krb5_state->ap_req_options,
gensec_get_target_service(gensec_security),
hostname,
&in_data, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
}
smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
switch (ret) {
case 0:
return NT_STATUS_OK;
case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5KDC_ERR_PREAUTH_FAILED:
case KRB5KRB_AP_ERR_TKT_EXPIRED:
case KRB5_CC_END:
/* Too much clock skew - we will need to kinit to re-skew the clock */
case KRB5KRB_AP_ERR_SKEW:
case KRB5_KDCREP_SKEW:
{
DEBUG(3, ("kerberos (mk_req) failed: %s\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
/*fall through*/
}
/* just don't print a message for these really ordinary messages */
case KRB5_FCC_NOFILE:
case KRB5_CC_NOTFOUND:
case ENOENT:
return NT_STATUS_UNSUCCESSFUL;
break;
default:
DEBUG(0, ("kerberos: %s\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_UNSUCCESSFUL;
}
}
static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
{
krb5_error_code ret;
struct gensec_krb5_state *gensec_krb5_state;
struct cli_credentials *creds;
const struct socket_address *my_addr, *peer_addr;
krb5_address my_krb5_addr, peer_krb5_addr;
creds = gensec_get_credentials(gensec_security);
if (!creds) {
return NT_STATUS_INVALID_PARAMETER;
}
gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
if (!gensec_krb5_state) {
return NT_STATUS_NO_MEMORY;
}
gensec_security->private_data = gensec_krb5_state;
gensec_krb5_state->smb_krb5_context = NULL;
gensec_krb5_state->auth_context = NULL;
gensec_krb5_state->ticket = NULL;
ZERO_STRUCT(gensec_krb5_state->enc_ticket);
gensec_krb5_state->keyblock = NULL;
gensec_krb5_state->session_key = data_blob(NULL, 0);
gensec_krb5_state->pac = data_blob(NULL, 0);
gensec_krb5_state->gssapi = gssapi;
talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
if (cli_credentials_get_krb5_context(creds,
gensec_security->event_ctx,
gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
gensec_krb5_state->auth_context,
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
my_addr = gensec_get_my_addr(gensec_security);
if (my_addr && my_addr->sockaddr) {
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
my_addr->sockaddr, &my_krb5_addr);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
}
peer_addr = gensec_get_peer_addr(gensec_security);
if (peer_addr && peer_addr->sockaddr) {
ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
peer_addr->sockaddr, &peer_krb5_addr);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
}
ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
gensec_krb5_state->auth_context,
my_addr ? &my_krb5_addr : NULL,
peer_addr ? &peer_krb5_addr : NULL);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
ret, gensec_krb5_state)));
talloc_free(gensec_krb5_state);
return NT_STATUS_INTERNAL_ERROR;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
{
struct gensec_krb5_state *gensec_krb5_state;
krb5_error_code ret;
NTSTATUS nt_status;
struct ccache_container *ccache_container;
const char *hostname;
const char *principal;
krb5_data in_data;
hostname = gensec_get_target_hostname(gensec_security);
if (!hostname) {
DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_ipaddress(hostname)) {
DEBUG(2, ("Cannot do krb5 to an IP address"));
return NT_STATUS_INVALID_PARAMETER;
}
if (strcmp(hostname, "localhost") == 0) {
DEBUG(2, ("krb5 to 'localhost' does not make sense"));
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_krb5_start(gensec_security, gssapi);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
if (gensec_krb5_state->gssapi) {
/* The Fake GSSAPI modal emulates Samba3, which does not do mutual authentication */
if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
}
} else {
/* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
}
}
principal = gensec_get_target_principal(gensec_security);
ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
gensec_security->event_ctx,
gensec_security->settings->lp_ctx, &ccache_container);
switch (ret) {
case 0:
break;
case KRB5KDC_ERR_PREAUTH_FAILED:
return NT_STATUS_LOGON_FAILURE;
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
default:
DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_message(ret)));
return NT_STATUS_UNSUCCESSFUL;
}
in_data.length = 0;
if (principal && lp_client_use_spnego_principal(gensec_security->settings->lp_ctx)) {
krb5_principal target_principal;
ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
&target_principal);
if (ret == 0) {
ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
&gensec_krb5_state->auth_context,
gensec_krb5_state->ap_req_options,
target_principal,
&in_data, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
target_principal);
}
} else {
ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
&gensec_krb5_state->auth_context,
gensec_krb5_state->ap_req_options,
gensec_get_target_service(gensec_security),
hostname,
&in_data, ccache_container->ccache,
&gensec_krb5_state->enc_ticket);
}
switch (ret) {
case 0:
return NT_STATUS_OK;
case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5KDC_ERR_PREAUTH_FAILED:
case KRB5KRB_AP_ERR_TKT_EXPIRED:
case KRB5_CC_END:
/* Too much clock skew - we will need to kinit to re-skew the clock */
case KRB5KRB_AP_ERR_SKEW:
case KRB5_KDCREP_SKEW:
{
DEBUG(3, ("kerberos (mk_req) failed: %s\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
/*fall through*/
}
/* just don't print a message for these really ordinary messages */
case KRB5_FCC_NOFILE:
case KRB5_CC_NOTFOUND:
case ENOENT:
return NT_STATUS_UNSUCCESSFUL;
break;
default:
DEBUG(0, ("kerberos: %s\n",
smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
return NT_STATUS_UNSUCCESSFUL;
}
}
