New upstream release.

1 files changed, 340 insertions, 0 deletions

diff --git a/src/libcharon/encoding/payloads/cert_payload.c b/src/libcharon/encoding/payloads/cert_payload.c
new file mode 100644
index 000000000..6dd3141f0
--- /dev/null
+++ b/src/libcharon/encoding/payloads/cert_payload.c
@@ -0,0 +1,340 @@
+/*
+ * Copyright (C) 2008 Tobias Brunner
+ * Copyright (C) 2005-2007 Martin Willi
+ * Copyright (C) 2005 Jan Hutter
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * 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.
+ */
+
+#include <stddef.h>
+#include <ctype.h>
+
+#include <daemon.h>
+
+#include "cert_payload.h"
+
+ENUM(cert_encoding_names, ENC_PKCS7_WRAPPED_X509, ENC_OCSP_CONTENT,
+	"ENC_PKCS7_WRAPPED_X509",
+	"ENC_PGP",
+	"ENC_DNS_SIGNED_KEY",
+	"ENC_X509_SIGNATURE",
+	"ENC_X509_KEY_EXCHANGE",
+	"ENC_KERBEROS_TOKENS",
+	"ENC_CRL",
+	"ENC_ARL",
+	"ENC_SPKI",
+	"ENC_X509_ATTRIBUTE",
+	"ENC_RAW_RSA_KEY",
+	"ENC_X509_HASH_AND_URL",
+	"ENC_X509_HASH_AND_URL_BUNDLE",
+	"ENC_OCSP_CONTENT",
+);
+
+typedef struct private_cert_payload_t private_cert_payload_t;
+
+/**
+ * Private data of an cert_payload_t object.
+ *
+ */
+struct private_cert_payload_t {
+	/**
+	 * Public cert_payload_t interface.
+	 */
+	cert_payload_t public;
+
+	/**
+	 * Next payload type.
+	 */
+	u_int8_t  next_payload;
+
+	/**
+	 * Critical flag.
+	 */
+	bool critical;
+
+	/**
+	 * Length of this payload.
+	 */
+	u_int16_t payload_length;
+
+	/**
+	 * Encoding of the CERT Data.
+	 */
+	u_int8_t encoding;
+
+	/**
+	 * The contained cert data value.
+	 */
+	chunk_t data;
+
+	/**
+	 * TRUE if the "Hash and URL" data is invalid
+	 */
+	bool invalid_hash_and_url;
+};
+
+/**
+ * Encoding rules to parse or generate a CERT payload
+ *
+ * The defined offsets are the positions in a object of type
+ * private_cert_payload_t.
+ *
+ */
+encoding_rule_t cert_payload_encodings[] = {
+	/* 1 Byte next payload type, stored in the field next_payload */
+	{ U_INT_8,			offsetof(private_cert_payload_t, next_payload) 	},
+	/* the critical bit */
+	{ FLAG,				offsetof(private_cert_payload_t, critical) 		},
+	/* 7 Bit reserved bits, nowhere stored */
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	{ RESERVED_BIT,	0 													},
+	/* Length of the whole payload*/
+	{ PAYLOAD_LENGTH,	offsetof(private_cert_payload_t, payload_length)},
+	/* 1 Byte CERT type*/
+	{ U_INT_8,			offsetof(private_cert_payload_t, encoding)		},
+	/* some cert data bytes, length is defined in PAYLOAD_LENGTH */
+	{ CERT_DATA,		offsetof(private_cert_payload_t, data) 			}
+};
+
+/*
+                           1                   2                   3
+       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      ! Next Payload  !C!  RESERVED   !         Payload Length        !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      ! Cert Encoding !                                               !
+      +-+-+-+-+-+-+-+-+                                               !
+      ~                       Certificate Data                        ~
+      !                                                               !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implementation of payload_t.verify.
+ */
+static status_t verify(private_cert_payload_t *this)
+{
+	if (this->encoding == ENC_X509_HASH_AND_URL ||
+		this->encoding == ENC_X509_HASH_AND_URL_BUNDLE)
+	{
+		/* coarse verification of "Hash and URL" encoded certificates */
+		if (this->data.len <= 20)
+		{
+			DBG1(DBG_ENC, "invalid payload length for hash-and-url (%d), ignore",
+					this->data.len);
+			this->invalid_hash_and_url = TRUE;
+			return SUCCESS;
+		}
+
+		int i = 20; /* skipping the hash */
+		for (; i < this->data.len; ++i)
+		{
+			if (this->data.ptr[i] == '\0')
+			{
+				/* null terminated, fine */
+				return SUCCESS;
+			}
+			else if (!isprint(this->data.ptr[i]))
+			{
+				DBG1(DBG_ENC, "non printable characters in url of hash-and-url"
+						" encoded certificate payload, ignore");
+				this->invalid_hash_and_url = TRUE;
+				return SUCCESS;
+			}
+		}
+
+		/* URL is not null terminated, correct that */
+		chunk_t data = chunk_alloc(this->data.len + 1);
+		memcpy(data.ptr, this->data.ptr, this->data.len);
+		data.ptr[this->data.len] = '\0';
+		chunk_free(&this->data);
+		this->data = data;
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implementation of cert_payload_t.get_encoding_rules.
+ */
+static void get_encoding_rules(private_cert_payload_t *this,
+							   encoding_rule_t **rules, size_t *rule_count)
+{
+	*rules = cert_payload_encodings;
+	*rule_count = sizeof(cert_payload_encodings) / sizeof(encoding_rule_t);
+}
+
+/**
+ * Implementation of payload_t.get_type.
+ */
+static payload_type_t get_payload_type(private_cert_payload_t *this)
+{
+	return CERTIFICATE;
+}
+
+/**
+ * Implementation of payload_t.get_next_type.
+ */
+static payload_type_t get_next_type(private_cert_payload_t *this)
+{
+	return this->next_payload;
+}
+
+/**
+ * Implementation of payload_t.set_next_type.
+ */
+static void set_next_type(private_cert_payload_t *this,payload_type_t type)
+{
+	this->next_payload = type;
+}
+
+/**
+ * Implementation of payload_t.get_length.
+ */
+static size_t get_length(private_cert_payload_t *this)
+{
+	return this->payload_length;
+}
+
+/**
+ * Implementation of cert_payload_t.get_cert_encoding.
+ */
+static cert_encoding_t get_cert_encoding(private_cert_payload_t *this)
+{
+	return this->encoding;
+}
+
+/**
+ * Implementation of cert_payload_t.get_cert.
+ */
+static certificate_t *get_cert(private_cert_payload_t *this)
+{
+	if (this->encoding != ENC_X509_SIGNATURE)
+	{
+		return NULL;
+	}
+	return lib->creds->create(lib->creds, CRED_CERTIFICATE, CERT_X509,
+							  BUILD_BLOB_ASN1_DER, this->data,
+							  BUILD_END);
+}
+
+/**
+ * Implementation of cert_payload_t.get_hash.
+ */
+static chunk_t get_hash(private_cert_payload_t *this)
+{
+	chunk_t hash = chunk_empty;
+	if ((this->encoding != ENC_X509_HASH_AND_URL &&
+		this->encoding != ENC_X509_HASH_AND_URL_BUNDLE) ||
+		this->invalid_hash_and_url)
+	{
+		return hash;
+	}
+	hash.ptr = this->data.ptr;
+	hash.len = 20;
+	return hash;
+}
+
+/**
+ * Implementation of cert_payload_t.get_url.
+ */
+static char *get_url(private_cert_payload_t *this)
+{
+	if ((this->encoding != ENC_X509_HASH_AND_URL &&
+		this->encoding != ENC_X509_HASH_AND_URL_BUNDLE) ||
+		this->invalid_hash_and_url)
+	{
+		return NULL;
+	}
+	return (char*)this->data.ptr + 20;
+}
+
+/**
+ * Implementation of payload_t.destroy and cert_payload_t.destroy.
+ */
+static void destroy(private_cert_payload_t *this)
+{
+	chunk_free(&this->data);
+	free(this);
+}
+
+/*
+ * Described in header
+ */
+cert_payload_t *cert_payload_create()
+{
+	private_cert_payload_t *this = malloc_thing(private_cert_payload_t);
+
+	this->public.payload_interface.verify = (status_t (*) (payload_t*))verify;
+	this->public.payload_interface.get_encoding_rules = (void (*) (payload_t*,encoding_rule_t**, size_t*))get_encoding_rules;
+	this->public.payload_interface.get_length = (size_t (*) (payload_t*))get_length;
+	this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t*))get_next_type;
+	this->public.payload_interface.set_next_type = (void (*) (payload_t*,payload_type_t))set_next_type;
+	this->public.payload_interface.get_type = (payload_type_t (*) (payload_t*))get_payload_type;
+	this->public.payload_interface.destroy = (void (*) (payload_t*))destroy;
+
+	this->public.destroy = (void (*) (cert_payload_t*))destroy;
+	this->public.get_cert = (certificate_t* (*) (cert_payload_t*))get_cert;
+	this->public.get_cert_encoding = (cert_encoding_t (*) (cert_payload_t*))get_cert_encoding;
+	this->public.get_hash = (chunk_t (*) (cert_payload_t*))get_hash;
+	this->public.get_url = (char* (*) (cert_payload_t*))get_url;
+
+	this->critical = FALSE;
+	this->next_payload = NO_PAYLOAD;
+	this->payload_length = CERT_PAYLOAD_HEADER_LENGTH;
+	this->data = chunk_empty;
+	this->encoding = 0;
+	this->invalid_hash_and_url = FALSE;
+
+	return &this->public;
+}
+
+/*
+ * Described in header
+ */
+cert_payload_t *cert_payload_create_from_cert(certificate_t *cert)
+{
+	private_cert_payload_t *this = (private_cert_payload_t*)cert_payload_create();
+
+	switch (cert->get_type(cert))
+	{
+		case CERT_X509:
+			this->encoding = ENC_X509_SIGNATURE;
+			break;
+		default:
+			DBG1(DBG_ENC, "embedding %N certificate in payload failed",
+				 certificate_type_names, cert->get_type(cert));
+			free(this);
+			return NULL;
+	}
+	this->data = cert->get_encoding(cert);
+	this->payload_length = CERT_PAYLOAD_HEADER_LENGTH + this->data.len;
+	return &this->public;
+}
+
+/*
+ * Described in header
+ */
+cert_payload_t *cert_payload_create_from_hash_and_url(chunk_t hash, char *url)
+{
+	private_cert_payload_t *this = (private_cert_payload_t*)cert_payload_create();
+
+	this->encoding = ENC_X509_HASH_AND_URL;
+	this->data = chunk_cat("cc", hash, chunk_create(url, strlen(url)));
+	this->payload_length = CERT_PAYLOAD_HEADER_LENGTH + this->data.len;
+	return &this->public;
+}
+