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-rw-r--r--src/libcharon/encoding/payloads/cert_payload.c340
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;
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-06 03:31:32 +0000