added "net join" command

this completes the first stage of the smbd ADS support
(This used to be commit 058a5aee901e6609969ef7e1d482a720a84a4a12)

1 files changed, 352 insertions, 0 deletions

diff --git a/source3/libads/krb5_setpw.c b/source3/libads/krb5_setpw.c
new file mode 100644
index 0000000000..5cb3de1bb5
--- /dev/null
+++ b/source3/libads/krb5_setpw.c
@@ -0,0 +1,352 @@
+/* 
+   Unix SMB/Netbios implementation.
+   Version 3.0
+   krb5 set password implementation
+   Copyright (C) Andrew Tridgell 2001
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#if HAVE_KRB5
+
+#define DEFAULT_KPASSWD_PORT	464
+#define KRB5_KPASSWD_VERS_CHANGEPW	1
+#define KRB5_KPASSWD_VERS_SETPW		0xff80
+#define KRB5_KPASSWD_ACCESSDENIED	5
+#define KRB5_KPASSWD_BAD_VERSION	6
+
+/* This implements the Kerb password change protocol as specifed in
+ * kerb-chg-password-02.txt
+ */
+static DATA_BLOB encode_krb5_setpw(const char *hostname, 
+				   const char *realm, const char *password)
+{
+	ASN1_DATA req;
+	DATA_BLOB ret;
+
+	memset(&req, 0, sizeof(req));
+	
+	asn1_push_tag(&req, ASN1_SEQUENCE(0));
+	asn1_push_tag(&req, ASN1_CONTEXT(0));
+	asn1_write_OctetString(&req, password, strlen(password));
+	asn1_pop_tag(&req);
+
+	asn1_push_tag(&req, ASN1_CONTEXT(1));
+	asn1_push_tag(&req, ASN1_SEQUENCE(0));
+
+	asn1_push_tag(&req, ASN1_CONTEXT(0));
+	asn1_write_Integer(&req, 1);
+	asn1_pop_tag(&req);
+
+	asn1_push_tag(&req, ASN1_CONTEXT(1));
+	asn1_push_tag(&req, ASN1_SEQUENCE(0));
+	asn1_write_GeneralString(&req, "HOST");
+	asn1_write_GeneralString(&req, hostname);
+	asn1_pop_tag(&req);
+	asn1_pop_tag(&req);
+	asn1_pop_tag(&req);
+	asn1_pop_tag(&req);
+
+	asn1_push_tag(&req, ASN1_CONTEXT(2));
+	asn1_write_GeneralString(&req, realm);
+	asn1_pop_tag(&req);
+	asn1_pop_tag(&req);
+
+	ret = data_blob(req.data, req.length);
+	asn1_free(&req);
+
+	return ret;
+}	
+
+static krb5_error_code build_setpw_request(krb5_context context,
+					   krb5_auth_context auth_context,
+					   krb5_data *ap_req,
+					   const char *hostname,
+					   const char *realm,
+					   const char *passwd,
+					   krb5_data *packet)
+{
+	krb5_error_code ret;
+	krb5_data cipherpw;
+	krb5_data encoded_setpw;
+	krb5_replay_data replay;
+	char *p;
+	DATA_BLOB setpw;
+
+	ret = krb5_auth_con_setflags(context,
+				     auth_context,KRB5_AUTH_CONTEXT_DO_SEQUENCE);
+	if (ret) {
+		DEBUG(1,("krb5_auth_con_setflags failed (%s)\n",
+			 error_message(ret)));
+		return ret;
+	}
+
+	setpw = encode_krb5_setpw(hostname, realm, passwd);
+
+	encoded_setpw.data = setpw.data;
+	encoded_setpw.length = setpw.length;
+
+	ret = krb5_mk_priv(context, auth_context,
+			   &encoded_setpw, &cipherpw, &replay);
+	if (ret) {
+		DEBUG(1,("krb5_mk_priv failed (%s)\n", error_message(ret)));
+		return ret;
+	}
+
+	packet->data = (char *)malloc(ap_req->length + cipherpw.length + 6);
+
+	/* see the RFC for details */
+	p = packet->data + 2;
+	RSSVAL(p, 0, 0xff80); p += 2;
+	RSSVAL(p, 0, ap_req->length); p += 2;
+	memcpy(p, ap_req->data, ap_req->length); p += ap_req->length;
+	memcpy(p, cipherpw.data, cipherpw.length); p += cipherpw.length;
+	packet->length = PTR_DIFF(p,packet->data);
+	RSSVAL(packet->data, 0, packet->length);
+	
+	return 0;
+}
+
+static krb5_error_code parse_setpw_reply(krb5_context context, 
+					 krb5_auth_context auth_context,
+					 krb5_data *packet)
+{
+	krb5_data ap_rep;
+	char *p;
+	int vnum, ret, res_code;
+	krb5_data cipherresult;
+	krb5_data clearresult;
+	krb5_ap_rep_enc_part *ap_rep_enc;
+	krb5_replay_data replay;
+	
+	if (packet->length < 4) {
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	p = packet->data;
+	
+	if (packet->data[0] == 0x7e || packet->data[0] == 0x5e) {
+		/* it's an error packet. We should parse it ... */
+		DEBUG(1,("Got error packet 0x%x from kpasswd server\n",
+			 packet->data[0]));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	if (RSVAL(p, 0) != packet->length) {
+		DEBUG(1,("Bad packet length (%d/%d) from kpasswd server\n",
+			 RSVAL(p, 0), packet->length));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+
+	p += 2;
+
+	vnum = RSVAL(p, 0); p += 2;
+	
+	if (vnum != KRB5_KPASSWD_VERS_SETPW && vnum != KRB5_KPASSWD_VERS_CHANGEPW) {
+		DEBUG(1,("Bad vnum (%d) from kpasswd server\n", vnum));
+		return KRB5KDC_ERR_BAD_PVNO;
+	}
+	
+	ap_rep.length = RSVAL(p, 0); p += 2;
+	
+	if (p + ap_rep.length >= packet->data + packet->length) {
+		DEBUG(1,("ptr beyond end of packet from kpasswd server\n"));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	if (ap_rep.length == 0) {
+		DEBUG(1,("got unencrypted setpw result?!\n"));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+
+	/* verify ap_rep */
+	ap_rep.data = p;
+	p += ap_rep.length;
+	
+	ret = krb5_rd_rep(context, auth_context, &ap_rep, &ap_rep_enc);
+	if (ret) {
+		DEBUG(1,("failed to rd setpw reply (%s)\n", error_message(ret)));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	krb5_free_ap_rep_enc_part(context, ap_rep_enc);
+	
+	cipherresult.data = p;
+	cipherresult.length = (packet->data + packet->length) - p;
+		
+	ret = krb5_rd_priv(context, auth_context, &cipherresult, &clearresult,
+			   &replay);
+	if (ret) {
+		DEBUG(1,("failed to decrypt setpw reply (%s)\n", error_message(ret)));
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+
+	if (clearresult.length < 2) {
+		ret = KRB5KRB_AP_ERR_MODIFIED;
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	p = clearresult.data;
+	
+	res_code = RSVAL(p, 0);
+	
+	if ((res_code < KRB5_KPASSWD_SUCCESS) || 
+	    (res_code > KRB5_KPASSWD_ACCESSDENIED)) {
+		return KRB5KRB_AP_ERR_MODIFIED;
+	}
+	
+	return 0;
+}
+
+NTSTATUS krb5_set_password(const char *kdc_host, const char *hostname,
+			   const char *realm,  const char *newpw)
+{
+	krb5_context context;
+	krb5_auth_context auth_context = NULL;
+	krb5_principal principal;
+	char *princ_name;
+	krb5_creds creds, *credsp;
+	krb5_ccache ccache;
+	krb5_data ap_req, chpw_req, chpw_rep;
+	int ret, sock, addr_len;
+	struct sockaddr remote_addr, local_addr;
+	krb5_address local_kaddr, remote_kaddr;
+
+	ret = krb5_init_context(&context);
+	if (ret) {
+		DEBUG(1,("Failed to init krb5 context (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	ret = krb5_cc_default(context, &ccache);
+	if (ret) {
+		DEBUG(1,("Failed to get default creds (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	ZERO_STRUCT(creds);
+	
+	asprintf(&princ_name, "kadmin/changepw@%s", realm);
+	ret = krb5_parse_name(context, princ_name, &creds.server);
+	if (ret) {
+		DEBUG(1,("Failed to parse kadmin/changepw (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	free(princ_name);
+
+	asprintf(&princ_name, "HOST/%s@%s", hostname, realm);
+	ret = krb5_parse_name(context, princ_name, &principal);
+	if (ret) {
+		DEBUG(1,("Failed to parse %s (%s)\n", princ_name, error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	free(princ_name);
+
+	krb5_princ_set_realm(context, creds.server,
+			     krb5_princ_realm(context, principal));
+	
+	ret = krb5_cc_get_principal(context, ccache, &creds.client);
+	if (ret) {
+		DEBUG(1,("Failed to get principal from ccache (%s)\n", 
+			 error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	ret = krb5_get_credentials(context, 0, ccache, &creds, &credsp);
+	if (ret) {
+		DEBUG(1,("krb5_get_credentials failed (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	ret = krb5_mk_req_extended(context, &auth_context, AP_OPTS_USE_SUBKEY,
+				   NULL, credsp, &ap_req);
+	if (ret) {
+		DEBUG(1,("krb5_mk_req_extended failed (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	sock = open_udp_socket(kdc_host, DEFAULT_KPASSWD_PORT);
+	if (sock == -1) {
+		DEBUG(1,("failed to open kpasswd socket to %s (%s)\n", 
+			 kdc_host, strerror(errno)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	addr_len = sizeof(remote_addr);
+	getpeername(sock, &remote_addr, &addr_len);
+	addr_len = sizeof(local_addr);
+	getsockname(sock, &local_addr, &addr_len);
+	
+	remote_kaddr.addrtype = ADDRTYPE_INET;
+	remote_kaddr.length = sizeof(((struct sockaddr_in *)&remote_addr)->sin_addr);
+	remote_kaddr.contents = (char *)&(((struct sockaddr_in *)&remote_addr)->sin_addr);
+	local_kaddr.addrtype = ADDRTYPE_INET;
+	local_kaddr.length = sizeof(((struct sockaddr_in *)&local_addr)->sin_addr);
+	local_kaddr.contents = (char *)&(((struct sockaddr_in *)&local_addr)->sin_addr);
+
+	ret = krb5_auth_con_setaddrs(context, auth_context, &local_kaddr, NULL);
+	if (ret) {
+		DEBUG(1,("krb5_auth_con_setaddrs failed (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	ret = build_setpw_request(context, auth_context, &ap_req,
+				  hostname, realm, newpw, &chpw_req);
+	if (ret) {
+		DEBUG(1,("build_setpw_request failed (%s)\n", error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	if (write(sock, chpw_req.data, chpw_req.length) != chpw_req.length) {
+		DEBUG(1,("send of chpw failed (%s)\n", strerror(errno)));
+		return NT_STATUS_UNSUCCESSFUL;		
+	}
+
+	free(chpw_req.data);
+
+	chpw_rep.length = 1500;
+	chpw_rep.data = (char *) malloc(chpw_rep.length);
+
+	ret = read(sock, chpw_rep.data, chpw_rep.length);
+	if (ret < 0) {
+		DEBUG(1,("recv of chpw reply failed (%s)\n", strerror(errno)));
+		return NT_STATUS_UNSUCCESSFUL;		
+	}
+
+	close(sock);
+	chpw_rep.length = ret;
+
+	ret = krb5_auth_con_setaddrs(context, auth_context, NULL,&remote_kaddr);
+	if (ret) {
+		DEBUG(1,("krb5_auth_con_setaddrs on reply failed (%s)\n", 
+			 error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	ret = parse_setpw_reply(context, auth_context, &chpw_rep);
+	free(chpw_rep.data);
+
+	if (ret) {
+		DEBUG(1,("parse_setpw_reply failed (%s)\n", 
+			 error_message(ret)));
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	return NT_STATUS_OK;
+}
+
+#endif