/* * Copyright (C) 2005-2006 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 . * * 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. * * $Id: certreq_payload.c 3589 2008-03-13 14:14:44Z martin $ */ #include #include #include #include #include "certreq_payload.h" typedef struct private_certreq_payload_t private_certreq_payload_t; /** * Private data of an certreq_payload_t object. * */ struct private_certreq_payload_t { /** * Public certreq_payload_t interface. */ certreq_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 certreq data value. */ chunk_t data; }; /** * Encoding rules to parse or generate a CERTREQ payload * * The defined offsets are the positions in a object of type * private_certreq_payload_t. * */ encoding_rule_t certreq_payload_encodings[] = { /* 1 Byte next payload type, stored in the field next_payload */ { U_INT_8, offsetof(private_certreq_payload_t, next_payload) }, /* the critical bit */ { FLAG, offsetof(private_certreq_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_certreq_payload_t, payload_length) }, /* 1 Byte CERTREQ type*/ { U_INT_8, offsetof(private_certreq_payload_t, encoding) }, /* some certreq data bytes, length is defined in PAYLOAD_LENGTH */ { CERTREQ_DATA, offsetof(private_certreq_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 ! ! +-+-+-+-+-+-+-+-+ ! ~ Certification Authority ~ ! ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ */ /** * Implementation of payload_t.verify. */ static status_t verify(private_certreq_payload_t *this) { if (this->encoding == ENC_X509_SIGNATURE) { if (this->data.len < HASH_SIZE_SHA1 || this->data.len % HASH_SIZE_SHA1) { DBG1(DBG_ENC, "invalid X509 hash length (%d) in certreq", this->data.len); return FAILED; } } return SUCCESS; } /** * Implementation of certreq_payload_t.get_encoding_rules. */ static void get_encoding_rules(private_certreq_payload_t *this, encoding_rule_t **rules, size_t *rule_count) { *rules = certreq_payload_encodings; *rule_count = sizeof(certreq_payload_encodings) / sizeof(encoding_rule_t); } /** * Implementation of payload_t.get_type. */ static payload_type_t get_payload_type(private_certreq_payload_t *this) { return CERTIFICATE_REQUEST; } /** * Implementation of payload_t.get_next_type. */ static payload_type_t get_next_type(private_certreq_payload_t *this) { return (this->next_payload); } /** * Implementation of payload_t.set_next_type. */ static void set_next_type(private_certreq_payload_t *this,payload_type_t type) { this->next_payload = type; } /** * Implementation of payload_t.get_length. */ static size_t get_length(private_certreq_payload_t *this) { return this->payload_length; } /** * Implementation of certreq_payload_t.add_keyid. */ static void add_keyid(private_certreq_payload_t *this, chunk_t keyid) { this->data = chunk_cat("mc", this->data, keyid); this->payload_length += keyid.len; } typedef struct keyid_enumerator_t keyid_enumerator_t; /** * enumerator to enumerate keyids */ struct keyid_enumerator_t { enumerator_t public; chunk_t full; u_char *pos; }; /** * enumerate function for keyid_enumerator */ static bool keyid_enumerate(keyid_enumerator_t *this, chunk_t *chunk) { if (this->pos == NULL) { this->pos = this->full.ptr; } else { this->pos += HASH_SIZE_SHA1; if (this->pos > (this->full.ptr + this->full.len - HASH_SIZE_SHA1)) { this->pos = NULL; } } if (this->pos) { chunk->ptr = this->pos; chunk->len = HASH_SIZE_SHA1; return TRUE; } return FALSE; } /** * Implementation of certreq_payload_t.create_keyid_enumerator. */ static enumerator_t* create_keyid_enumerator(private_certreq_payload_t *this) { keyid_enumerator_t *enumerator = malloc_thing(keyid_enumerator_t); enumerator->public.enumerate = (void*)keyid_enumerate; enumerator->public.destroy = (void*)free; enumerator->full = this->data; enumerator->pos = NULL; return &enumerator->public; } /** * Implementation of certreq_payload_t.get_cert_type. */ static certificate_type_t get_cert_type(private_certreq_payload_t *this) { switch (this->encoding) { case ENC_X509_SIGNATURE: return CERT_X509; default: return CERT_ANY; } } /** * Implementation of payload_t.destroy and certreq_payload_t.destroy. */ static void destroy(private_certreq_payload_t *this) { chunk_free(&this->data); free(this); } /* * Described in header */ certreq_payload_t *certreq_payload_create() { private_certreq_payload_t *this = malloc_thing(private_certreq_payload_t); /* interface functions */ 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; /* public functions */ this->public.destroy = (void (*) (certreq_payload_t*)) destroy; this->public.create_keyid_enumerator = (enumerator_t*(*)(certreq_payload_t*))create_keyid_enumerator; this->public.get_cert_type = (certificate_type_t(*)(certreq_payload_t*))get_cert_type; this->public.add_keyid = (void(*)(certreq_payload_t*, chunk_t keyid))add_keyid; /* private variables */ this->critical = FALSE; this->next_payload = NO_PAYLOAD; this->payload_length = CERTREQ_PAYLOAD_HEADER_LENGTH; this->data = chunk_empty; this->encoding = 0; return &this->public; } /* * Described in header */ certreq_payload_t *certreq_payload_create_type(certificate_type_t type) { private_certreq_payload_t *this = (private_certreq_payload_t*)certreq_payload_create(); switch (type) { case CERT_X509: this->encoding = ENC_X509_SIGNATURE; break; default: DBG1(DBG_ENC, "certificate type %N not supported in requests", certificate_type_names, type); free(this); return NULL; } return &this->public; }