1 files changed, 528 insertions, 0 deletions
diff --git a/crypto/heimdal/appl/ftp/ftpd/gssapi.c b/crypto/heimdal/appl/ftp/ftpd/gssapi.c
new file mode 100644
index 000000000000..9432feb8290e
--- /dev/null
+++ b/crypto/heimdal/appl/ftp/ftpd/gssapi.c
@@ -0,0 +1,528 @@
+/*
+ * Copyright (c) 1998 - 2005 Kungliga Tekniska H�gskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#ifdef FTP_SERVER
+#include "ftpd_locl.h"
+#else
+#include "ftp_locl.h"
+#endif
+#include <gssapi.h>
+#include <krb5_err.h>
+
+RCSID("$Id: gssapi.c 21513 2007-07-12 12:45:25Z lha $");
+
+int ftp_do_gss_bindings = 0;
+int ftp_do_gss_delegate = 1;
+
+struct gss_data {
+    gss_ctx_id_t context_hdl;
+    char *client_name;
+    gss_cred_id_t delegated_cred_handle;
+    void *mech_data;
+};
+
+static int
+gss_init(void *app_data)
+{
+    struct gss_data *d = app_data;
+    d->context_hdl = GSS_C_NO_CONTEXT;
+    d->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
+#if defined(FTP_SERVER)
+    return 0;
+#else
+    /* XXX Check the gss mechanism; with  gss_indicate_mechs() ? */
+#ifdef KRB5
+    return !use_kerberos;
+#else
+    return 0;
+#endif /* KRB5 */
+#endif /* FTP_SERVER */
+}
+
+static int
+gss_check_prot(void *app_data, int level)
+{
+    if(level == prot_confidential)
+	return -1;
+    return 0;
+}
+
+static int
+gss_decode(void *app_data, void *buf, int len, int level)
+{
+    OM_uint32 maj_stat, min_stat;
+    gss_buffer_desc input, output;
+    gss_qop_t qop_state;
+    int conf_state;
+    struct gss_data *d = app_data;
+    size_t ret_len;
+
+    input.length = len;
+    input.value = buf;
+    maj_stat = gss_unwrap (&min_stat,
+			   d->context_hdl,
+			   &input,
+			   &output,
+			   &conf_state,
+			   &qop_state);
+    if(GSS_ERROR(maj_stat))
+	return -1;
+    memmove(buf, output.value, output.length);
+    ret_len = output.length;
+    gss_release_buffer(&min_stat, &output);
+    return ret_len;
+}
+
+static int
+gss_overhead(void *app_data, int level, int len)
+{
+    return 100; /* dunno? */
+}
+
+
+static int
+gss_encode(void *app_data, void *from, int length, int level, void **to)
+{
+    OM_uint32 maj_stat, min_stat;
+    gss_buffer_desc input, output;
+    int conf_state;
+    struct gss_data *d = app_data;
+
+    input.length = length;
+    input.value = from;
+    maj_stat = gss_wrap (&min_stat,
+			 d->context_hdl,
+			 level == prot_private,
+			 GSS_C_QOP_DEFAULT,
+			 &input,
+			 &conf_state,
+			 &output);
+    *to = output.value;
+    return output.length;
+}
+
+static void
+sockaddr_to_gss_address (struct sockaddr *sa,
+			 OM_uint32 *addr_type,
+			 gss_buffer_desc *gss_addr)
+{
+    switch (sa->sa_family) {
+#ifdef HAVE_IPV6
+    case AF_INET6 : {
+	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
+
+	gss_addr->length = 16;
+	gss_addr->value  = &sin6->sin6_addr;
+	*addr_type       = GSS_C_AF_INET6;
+	break;
+    }
+#endif
+    case AF_INET : {
+	struct sockaddr_in *sin4 = (struct sockaddr_in *)sa;
+
+	gss_addr->length = 4;
+	gss_addr->value  = &sin4->sin_addr;
+	*addr_type       = GSS_C_AF_INET;
+	break;
+    }
+    default :
+	errx (1, "unknown address family %d", sa->sa_family);
+	
+    }
+}
+
+/* end common stuff */
+
+#ifdef FTP_SERVER
+
+static int
+gss_adat(void *app_data, void *buf, size_t len)
+{
+    char *p = NULL;
+    gss_buffer_desc input_token, output_token;
+    OM_uint32 maj_stat, min_stat;
+    gss_name_t client_name;
+    struct gss_data *d = app_data;
+    gss_channel_bindings_t bindings;
+
+    if (ftp_do_gss_bindings) {
+	bindings = malloc(sizeof(*bindings));
+	if (bindings == NULL)
+	    errx(1, "out of memory");
+
+	sockaddr_to_gss_address (his_addr,
+				 &bindings->initiator_addrtype,
+				 &bindings->initiator_address);
+	sockaddr_to_gss_address (ctrl_addr,
+				 &bindings->acceptor_addrtype,
+				 &bindings->acceptor_address);
+	
+	bindings->application_data.length = 0;
+	bindings->application_data.value = NULL;
+    } else
+	bindings = GSS_C_NO_CHANNEL_BINDINGS;
+
+    input_token.value = buf;
+    input_token.length = len;
+
+    maj_stat = gss_accept_sec_context (&min_stat,
+				       &d->context_hdl,
+				       GSS_C_NO_CREDENTIAL,
+				       &input_token,
+				       bindings,
+				       &client_name,
+				       NULL,
+				       &output_token,
+				       NULL,
+				       NULL,
+				       &d->delegated_cred_handle);
+
+    if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+	free(bindings);
+
+    if(output_token.length) {
+	if(base64_encode(output_token.value, output_token.length, &p) < 0) {
+	    reply(535, "Out of memory base64-encoding.");
+	    return -1;
+	}
+	gss_release_buffer(&min_stat, &output_token);
+    }
+    if(maj_stat == GSS_S_COMPLETE){
+	char *name;
+	gss_buffer_desc export_name;
+	gss_OID oid;
+
+	maj_stat = gss_display_name(&min_stat, client_name,
+				    &export_name, &oid);
+	if(maj_stat != 0) {
+	    reply(500, "Error displaying name");
+	    goto out;
+	}
+	/* XXX kerberos */
+	if(oid != GSS_KRB5_NT_PRINCIPAL_NAME) {
+	    reply(500, "OID not kerberos principal name");
+	    gss_release_buffer(&min_stat, &export_name);
+	    goto out;
+	}
+	name = malloc(export_name.length + 1);
+	if(name == NULL) {
+	    reply(500, "Out of memory");
+	    gss_release_buffer(&min_stat, &export_name);
+	    goto out;
+	}
+	memcpy(name, export_name.value, export_name.length);
+	name[export_name.length] = '\0';
+	gss_release_buffer(&min_stat, &export_name);
+	d->client_name = name;
+	if(p)
+	    reply(235, "ADAT=%s", p);
+	else
+	    reply(235, "ADAT Complete");
+	sec_complete = 1;
+
+    } else if(maj_stat == GSS_S_CONTINUE_NEEDED) {
+	if(p)
+	    reply(335, "ADAT=%s", p);
+	else
+	    reply(335, "OK, need more data");
+    } else {
+	OM_uint32 new_stat;
+	OM_uint32 msg_ctx = 0;
+	gss_buffer_desc status_string;
+	gss_display_status(&new_stat,
+			   min_stat,
+			   GSS_C_MECH_CODE,
+			   GSS_C_NO_OID,
+			   &msg_ctx,
+			   &status_string);
+	syslog(LOG_ERR, "gss_accept_sec_context: %s", 
+	       (char*)status_string.value);
+	gss_release_buffer(&new_stat, &status_string);
+	reply(431, "Security resource unavailable");
+    }
+  out:
+    if (client_name)
+	gss_release_name(&min_stat, &client_name);
+    free(p);
+    return 0;
+}
+
+int gss_userok(void*, char*);
+int gss_session(void*, char*);
+
+struct sec_server_mech gss_server_mech = {
+    "GSSAPI",
+    sizeof(struct gss_data),
+    gss_init, /* init */
+    NULL, /* end */
+    gss_check_prot,
+    gss_overhead,
+    gss_encode,
+    gss_decode,
+    /* */
+    NULL,
+    gss_adat,
+    NULL, /* pbsz */
+    NULL, /* ccc */
+    gss_userok,
+    gss_session
+};
+
+#else /* FTP_SERVER */
+
+extern struct sockaddr *hisctladdr, *myctladdr;
+
+static int
+import_name(const char *kname, const char *host, gss_name_t *target_name)
+{
+    OM_uint32 maj_stat, min_stat;
+    gss_buffer_desc name;
+    char *str;
+
+    name.length = asprintf(&str, "%s@%s", kname, host);
+    if (str == NULL) {
+	printf("Out of memory\n");
+	return AUTH_ERROR;
+    }
+    name.value = str;
+
+    maj_stat = gss_import_name(&min_stat,
+			       &name,
+			       GSS_C_NT_HOSTBASED_SERVICE,
+			       target_name);
+    if (GSS_ERROR(maj_stat)) {
+	OM_uint32 new_stat;
+	OM_uint32 msg_ctx = 0;
+	gss_buffer_desc status_string;
+	    
+	gss_display_status(&new_stat,
+			   min_stat,
+			   GSS_C_MECH_CODE,
+			   GSS_C_NO_OID,
+			   &msg_ctx,
+			   &status_string);
+	printf("Error importing name %s: %s\n", 
+	       (char *)name.value,
+	       (char *)status_string.value);
+	free(name.value);
+	gss_release_buffer(&new_stat, &status_string);
+	return AUTH_ERROR;
+    }
+    free(name.value);
+    return 0;
+}
+
+static int
+gss_auth(void *app_data, char *host)
+{
+    
+    OM_uint32 maj_stat, min_stat;
+    gss_name_t target_name;
+    gss_buffer_desc input, output_token;
+    int context_established = 0;
+    char *p;
+    int n;
+    gss_channel_bindings_t bindings;
+    struct gss_data *d = app_data;
+    OM_uint32 mech_flags = GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG;
+
+    const char *knames[] = { "ftp", "host", NULL }, **kname = knames;
+	    
+    
+    if(import_name(*kname++, host, &target_name))
+	return AUTH_ERROR;
+
+    input.length = 0;
+    input.value = NULL;
+
+    if (ftp_do_gss_bindings) {
+	bindings = malloc(sizeof(*bindings));
+	if (bindings == NULL)
+	    errx(1, "out of memory");
+	
+	sockaddr_to_gss_address (myctladdr,
+				 &bindings->initiator_addrtype,
+				 &bindings->initiator_address);
+	sockaddr_to_gss_address (hisctladdr,
+				 &bindings->acceptor_addrtype,
+				 &bindings->acceptor_address);
+	
+	bindings->application_data.length = 0;
+	bindings->application_data.value = NULL;
+    } else
+	bindings = GSS_C_NO_CHANNEL_BINDINGS;
+
+    if (ftp_do_gss_delegate)
+	mech_flags |= GSS_C_DELEG_FLAG;
+
+    while(!context_established) {
+	maj_stat = gss_init_sec_context(&min_stat,
+					GSS_C_NO_CREDENTIAL,
+					&d->context_hdl,
+					target_name,
+					GSS_C_NO_OID,
+                                        mech_flags,
+					0,
+					bindings,
+					&input,
+					NULL,
+					&output_token,
+					NULL,
+					NULL);
+	if (GSS_ERROR(maj_stat)) {
+	    OM_uint32 new_stat;
+	    OM_uint32 msg_ctx = 0;
+	    gss_buffer_desc status_string;
+
+	    d->context_hdl = GSS_C_NO_CONTEXT;
+
+	    gss_release_name(&min_stat, &target_name);
+
+	    if(*kname != NULL) {
+
+		if(import_name(*kname++, host, &target_name)) {
+		    if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+			free(bindings);
+		    return AUTH_ERROR;
+		}
+		continue;
+	    }
+	    
+	    if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+		free(bindings);
+
+	    gss_display_status(&new_stat,
+			       min_stat,
+			       GSS_C_MECH_CODE,
+			       GSS_C_NO_OID,
+			       &msg_ctx,
+			       &status_string);
+	    printf("Error initializing security context: %s\n", 
+		   (char*)status_string.value);
+	    gss_release_buffer(&new_stat, &status_string);
+	    return AUTH_CONTINUE;
+	}
+
+	if (input.value) {
+	    free(input.value);
+	    input.value = NULL;
+	    input.length = 0;
+	}
+	if (output_token.length != 0) {
+	    base64_encode(output_token.value, output_token.length, &p);
+	    gss_release_buffer(&min_stat, &output_token);
+	    n = command("ADAT %s", p);
+	    free(p);
+	}
+	if (GSS_ERROR(maj_stat)) {
+	    if (d->context_hdl != GSS_C_NO_CONTEXT)
+		gss_delete_sec_context (&min_stat,
+					&d->context_hdl,
+					GSS_C_NO_BUFFER);
+	    break;
+	}
+	if (maj_stat & GSS_S_CONTINUE_NEEDED) {
+	    p = strstr(reply_string, "ADAT=");
+	    if(p == NULL){
+		printf("Error: expected ADAT in reply. got: %s\n",
+		       reply_string);
+		if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+		    free(bindings);
+		return AUTH_ERROR;
+	    } else {
+		p+=5;
+		input.value = malloc(strlen(p));
+		input.length = base64_decode(p, input.value);
+	    }
+	} else {
+	    if(code != 235) {
+		printf("Unrecognized response code: %d\n", code);
+		if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+		    free(bindings);
+		return AUTH_ERROR;
+	    }
+	    context_established = 1;
+	}
+    }
+
+    gss_release_name(&min_stat, &target_name);
+
+    if (bindings != GSS_C_NO_CHANNEL_BINDINGS)
+	free(bindings);
+    if (input.value)
+	free(input.value);
+
+    {
+	gss_name_t targ_name;
+
+	maj_stat = gss_inquire_context(&min_stat,
+				       d->context_hdl,
+				       NULL,
+				       &targ_name,
+				       NULL,
+				       NULL,
+				       NULL,
+				       NULL,
+				       NULL);
+	if (GSS_ERROR(maj_stat) == 0) {
+	    gss_buffer_desc name;
+	    maj_stat = gss_display_name (&min_stat,
+					 targ_name,
+					 &name,
+					 NULL);
+	    if (GSS_ERROR(maj_stat) == 0) {
+		printf("Authenticated to <%s>\n", (char *)name.value);
+		gss_release_buffer(&min_stat, &name);
+	    }
+	    gss_release_name(&min_stat, &targ_name);
+	} else
+	    printf("Failed to get gss name of peer.\n");
+    }	    
+
+
+    return AUTH_OK;
+}
+
+struct sec_client_mech gss_client_mech = {
+    "GSSAPI",
+    sizeof(struct gss_data),
+    gss_init,
+    gss_auth,
+    NULL, /* end */
+    gss_check_prot,
+    gss_overhead,
+    gss_encode,
+    gss_decode,
+};
+
+#endif /* FTP_SERVER */