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mbedtls/include/polarssl/x509_crt.h
Manuel Pégourié-Gonnard 7afb8a0dca Add x509_crt_check_extended_key_usage()
2014-04-11 11:09:00 +02:00

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/**
* \file x509_crt.h
*
* \brief X.509 certificate parsing and writing
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_X509_CRT_H
#define POLARSSL_X509_CRT_H
#include "config.h"
#include "x509.h"
#include "x509_crl.h"
/**
* \addtogroup x509_module
* \{
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* \name Structures and functions for parsing and writing X.509 certificates
* \{
*/
/**
* Container for an X.509 certificate. The certificate may be chained.
*/
typedef struct _x509_crt
{
x509_buf raw; /**< The raw certificate data (DER). */
x509_buf tbs; /**< The raw certificate body (DER). The part that is To Be Signed. */
int version; /**< The X.509 version. (0=v1, 1=v2, 2=v3) */
x509_buf serial; /**< Unique id for certificate issued by a specific CA. */
x509_buf sig_oid1; /**< Signature algorithm, e.g. sha1RSA */
x509_buf issuer_raw; /**< The raw issuer data (DER). Used for quick comparison. */
x509_buf subject_raw; /**< The raw subject data (DER). Used for quick comparison. */
x509_name issuer; /**< The parsed issuer data (named information object). */
x509_name subject; /**< The parsed subject data (named information object). */
x509_time valid_from; /**< Start time of certificate validity. */
x509_time valid_to; /**< End time of certificate validity. */
pk_context pk; /**< Container for the public key context. */
x509_buf issuer_id; /**< Optional X.509 v2/v3 issuer unique identifier. */
x509_buf subject_id; /**< Optional X.509 v2/v3 subject unique identifier. */
x509_buf v3_ext; /**< Optional X.509 v3 extensions. */
x509_sequence subject_alt_names; /**< Optional list of Subject Alternative Names (Only dNSName supported). */
int ext_types; /**< Bit string containing detected and parsed extensions */
int ca_istrue; /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
int max_pathlen; /**< Optional Basic Constraint extension value: The maximum path length to the root certificate. Path length is 1 higher than RFC 5280 'meaning', so 1+ */
unsigned char key_usage; /**< Optional key usage extension value: See the values in x509.h */
x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
unsigned char ns_cert_type; /**< Optional Netscape certificate type extension value: See the values in x509.h */
x509_buf sig_oid2; /**< Signature algorithm. Must match sig_oid1. */
x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
md_type_t sig_md; /**< Internal representation of the MD algorithm of the signature algorithm, e.g. POLARSSL_MD_SHA256 */
pk_type_t sig_pk /**< Internal representation of the Public Key algorithm of the signature algorithm, e.g. POLARSSL_PK_RSA */;
struct _x509_crt *next; /**< Next certificate in the CA-chain. */
}
x509_crt;
#define X509_CRT_VERSION_1 0
#define X509_CRT_VERSION_2 1
#define X509_CRT_VERSION_3 2
#define X509_RFC5280_MAX_SERIAL_LEN 32
#define X509_RFC5280_UTC_TIME_LEN 15
/**
* Container for writing a certificate (CRT)
*/
typedef struct _x509write_cert
{
int version;
mpi serial;
pk_context *subject_key;
pk_context *issuer_key;
asn1_named_data *subject;
asn1_named_data *issuer;
md_type_t md_alg;
char not_before[X509_RFC5280_UTC_TIME_LEN + 1];
char not_after[X509_RFC5280_UTC_TIME_LEN + 1];
asn1_named_data *extensions;
}
x509write_cert;
#if defined(POLARSSL_X509_CRT_PARSE_C)
/**
* \brief Parse a single DER formatted certificate and add it
* to the chained list.
*
* \param chain points to the start of the chain
* \param buf buffer holding the certificate DER data
* \param buflen size of the buffer
*
* \return 0 if successful, or a specific X509 or PEM error code
*/
int x509_crt_parse_der( x509_crt *chain, const unsigned char *buf,
size_t buflen );
/**
* \brief Parse one or more certificates and add them
* to the chained list. Parses permissively. If some
* certificates can be parsed, the result is the number
* of failed certificates it encountered. If none complete
* correctly, the first error is returned.
*
* \param chain points to the start of the chain
* \param buf buffer holding the certificate data
* \param buflen size of the buffer
*
* \return 0 if all certificates parsed successfully, a positive number
* if partly successful or a specific X509 or PEM error code
*/
int x509_crt_parse( x509_crt *chain, const unsigned char *buf, size_t buflen );
#if defined(POLARSSL_FS_IO)
/**
* \brief Load one or more certificates and add them
* to the chained list. Parses permissively. If some
* certificates can be parsed, the result is the number
* of failed certificates it encountered. If none complete
* correctly, the first error is returned.
*
* \param chain points to the start of the chain
* \param path filename to read the certificates from
*
* \return 0 if all certificates parsed successfully, a positive number
* if partly successful or a specific X509 or PEM error code
*/
int x509_crt_parse_file( x509_crt *chain, const char *path );
/**
* \brief Load one or more certificate files from a path and add them
* to the chained list. Parses permissively. If some
* certificates can be parsed, the result is the number
* of failed certificates it encountered. If none complete
* correctly, the first error is returned.
*
* \warning This function is NOT thread-safe unless
* POLARSSL_THREADING_PTHREADS is defined. If you're using an
* alternative threading implementation, you should either use
* this function only in the main thread, or mutex it.
*
* \param chain points to the start of the chain
* \param path directory / folder to read the certificate files from
*
* \return 0 if all certificates parsed successfully, a positive number
* if partly successful or a specific X509 or PEM error code
*/
int x509_crt_parse_path( x509_crt *chain, const char *path );
#endif /* POLARSSL_FS_IO */
/**
* \brief Returns an informational string about the
* certificate.
*
* \param buf Buffer to write to
* \param size Maximum size of buffer
* \param prefix A line prefix
* \param crt The X509 certificate to represent
*
* \return The amount of data written to the buffer, or -1 in
* case of an error.
*/
int x509_crt_info( char *buf, size_t size, const char *prefix,
const x509_crt *crt );
/**
* \brief Verify the certificate signature
*
* The verify callback is a user-supplied callback that
* can clear / modify / add flags for a certificate. If set,
* the verification callback is called for each
* certificate in the chain (from the trust-ca down to the
* presented crt). The parameters for the callback are:
* (void *parameter, x509_crt *crt, int certificate_depth,
* int *flags). With the flags representing current flags for
* that specific certificate and the certificate depth from
* the bottom (Peer cert depth = 0).
*
* All flags left after returning from the callback
* are also returned to the application. The function should
* return 0 for anything but a fatal error.
*
* \param crt a certificate to be verified
* \param trust_ca the trusted CA chain
* \param ca_crl the CRL chain for trusted CA's
* \param cn expected Common Name (can be set to
* NULL if the CN must not be verified)
* \param flags result of the verification
* \param f_vrfy verification function
* \param p_vrfy verification parameter
*
* \return 0 if successful or POLARSSL_ERR_X509_SIG_VERIFY_FAILED,
* in which case *flags will have one or more of
* the following values set:
* BADCERT_EXPIRED --
* BADCERT_REVOKED --
* BADCERT_CN_MISMATCH --
* BADCERT_NOT_TRUSTED
* or another error in case of a fatal error encountered
* during the verification process.
*/
int x509_crt_verify( x509_crt *crt,
x509_crt *trust_ca,
x509_crl *ca_crl,
const char *cn, int *flags,
int (*f_vrfy)(void *, x509_crt *, int, int *),
void *p_vrfy );
#if defined(POLARSSL_X509_CHECK_KEY_USAGE)
/**
* \brief Check usage of certificate against keyUsage extension.
*
* \param crt Leaf certificate used.
* \param usage Intended usage(s) (eg KU_KEY_ENCIPHERMENT before using the
* certificate to perform an RSA key exchange).
*
* \return 0 is these uses of the certificate are allowed,
* POLARSSL_ERR_X509_BAD_INPUT_DATA if the keyUsage extension
* is present but does not contain all the bits set in the
* usage argument.
*
* \note You should only call this function on leaf certificates, on
* (intermediate) CAs the keyUsage extension is automatically
* checked by \c x509_crt_verify().
*/
int x509_crt_check_key_usage( const x509_crt *crt, int usage );
#endif /* POLARSSL_X509_CHECK_KEY_USAGE) */
#if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
/**
* \brief Check usage of certificate against extentedJeyUsage.
*
* \param crt Leaf certificate used.
* \param usage_oid Intended usage (eg OID_SERVER_AUTH or OID_CLIENT_AUTH).
* \param usage_len Length of usage_oid (eg given by OID_SIZE()).
*
* \return 0 is this use of the certificate is allowed,
* POLARSSL_ERR_X509_BAD_INPUT_DATA if not.
*
* \note Usually only makes sense on leaf certificates.
*/
int x509_crt_check_extended_key_usage( const x509_crt *crt,
const char *usage_oid,
size_t usage_len );
#endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) */
#if defined(POLARSSL_X509_CRL_PARSE_C)
/**
* \brief Verify the certificate revocation status
*
* \param crt a certificate to be verified
* \param crl the CRL to verify against
*
* \return 1 if the certificate is revoked, 0 otherwise
*
*/
int x509_crt_revoked( const x509_crt *crt, const x509_crl *crl );
#endif /* POLARSSL_X509_CRL_PARSE_C */
/**
* \brief Initialize a certificate (chain)
*
* \param crt Certificate chain to initialize
*/
void x509_crt_init( x509_crt *crt );
/**
* \brief Unallocate all certificate data
*
* \param crt Certificate chain to free
*/
void x509_crt_free( x509_crt *crt );
#endif /* POLARSSL_X509_CRT_PARSE_C */
/* \} name */
/* \} addtogroup x509_module */
#if defined(POLARSSL_X509_CRT_WRITE_C)
/**
* \brief Initialize a CRT writing context
*
* \param ctx CRT context to initialize
*/
void x509write_crt_init( x509write_cert *ctx );
/**
* \brief Set the verion for a Certificate
* Default: X509_CRT_VERSION_3
*
* \param ctx CRT context to use
* \param version version to set (X509_CRT_VERSION_1, X509_CRT_VERSION_2 or
* X509_CRT_VERSION_3)
*/
void x509write_crt_set_version( x509write_cert *ctx, int version );
/**
* \brief Set the serial number for a Certificate.
*
* \param ctx CRT context to use
* \param serial serial number to set
*
* \return 0 if successful
*/
int x509write_crt_set_serial( x509write_cert *ctx, const mpi *serial );
/**
* \brief Set the validity period for a Certificate
* Timestamps should be in string format for UTC timezone
* i.e. "YYYYMMDDhhmmss"
* e.g. "20131231235959" for December 31st 2013
* at 23:59:59
*
* \param ctx CRT context to use
* \param not_before not_before timestamp
* \param not_after not_after timestamp
*
* \return 0 if timestamp was parsed successfully, or
* a specific error code
*/
int x509write_crt_set_validity( x509write_cert *ctx, const char *not_before,
const char *not_after );
/**
* \brief Set the issuer name for a Certificate
* Issuer names should contain a comma-separated list
* of OID types and values:
* e.g. "C=NL,O=Offspark,CN=PolarSSL CA"
*
* \param ctx CRT context to use
* \param issuer_name issuer name to set
*
* \return 0 if issuer name was parsed successfully, or
* a specific error code
*/
int x509write_crt_set_issuer_name( x509write_cert *ctx,
const char *issuer_name );
/**
* \brief Set the subject name for a Certificate
* Subject names should contain a comma-separated list
* of OID types and values:
* e.g. "C=NL,O=Offspark,CN=PolarSSL Server 1"
*
* \param ctx CRT context to use
* \param subject_name subject name to set
*
* \return 0 if subject name was parsed successfully, or
* a specific error code
*/
int x509write_crt_set_subject_name( x509write_cert *ctx,
const char *subject_name );
/**
* \brief Set the subject public key for the certificate
*
* \param ctx CRT context to use
* \param key public key to include
*/
void x509write_crt_set_subject_key( x509write_cert *ctx, pk_context *key );
/**
* \brief Set the issuer key used for signing the certificate
*
* \param ctx CRT context to use
* \param key private key to sign with
*/
void x509write_crt_set_issuer_key( x509write_cert *ctx, pk_context *key );
/**
* \brief Set the MD algorithm to use for the signature
* (e.g. POLARSSL_MD_SHA1)
*
* \param ctx CRT context to use
* \param md_alg MD algorithm to use
*/
void x509write_crt_set_md_alg( x509write_cert *ctx, md_type_t md_alg );
/**
* \brief Generic function to add to or replace an extension in the
* CRT
*
* \param ctx CRT context to use
* \param oid OID of the extension
* \param oid_len length of the OID
* \param critical if the extension is critical (per the RFC's definition)
* \param val value of the extension OCTET STRING
* \param val_len length of the value data
*
* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_extension( x509write_cert *ctx,
const char *oid, size_t oid_len,
int critical,
const unsigned char *val, size_t val_len );
/**
* \brief Set the basicConstraints extension for a CRT
*
* \param ctx CRT context to use
* \param is_ca is this a CA certificate
* \param max_pathlen maximum length of certificate chains below this
* certificate (only for CA certificates, -1 is
* inlimited)
*
* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_basic_constraints( x509write_cert *ctx,
int is_ca, int max_pathlen );
#if defined(POLARSSL_SHA1_C)
/**
* \brief Set the subjectKeyIdentifier extension for a CRT
* Requires that x509write_crt_set_subject_key() has been
* called before
*
* \param ctx CRT context to use
*
* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_subject_key_identifier( x509write_cert *ctx );
/**
* \brief Set the authorityKeyIdentifier extension for a CRT
* Requires that x509write_crt_set_issuer_key() has been
* called before
*
* \param ctx CRT context to use
*
* \return 0 if successful, or a POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_authority_key_identifier( x509write_cert *ctx );
#endif /* POLARSSL_SHA1_C */
/**
* \brief Set the Key Usage Extension flags
* (e.g. KU_DIGITAL_SIGNATURE | KU_KEY_CERT_SIGN)
*
* \param ctx CRT context to use
* \param key_usage key usage flags to set
*
* \return 0 if successful, or POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_key_usage( x509write_cert *ctx, unsigned char key_usage );
/**
* \brief Set the Netscape Cert Type flags
* (e.g. NS_CERT_TYPE_SSL_CLIENT | NS_CERT_TYPE_EMAIL)
*
* \param ctx CRT context to use
* \param ns_cert_type Netscape Cert Type flags to set
*
* \return 0 if successful, or POLARSSL_ERR_X509WRITE_MALLOC_FAILED
*/
int x509write_crt_set_ns_cert_type( x509write_cert *ctx,
unsigned char ns_cert_type );
/**
* \brief Free the contents of a CRT write context
*
* \param ctx CRT context to free
*/
void x509write_crt_free( x509write_cert *ctx );
/**
* \brief Write a built up certificate to a X509 DER structure
* Note: data is written at the end of the buffer! Use the
* return value to determine where you should start
* using the buffer
*
* \param ctx certificate to write away
* \param buf buffer to write to
* \param size size of the buffer
* \param f_rng RNG function (for signature, see note)
* \param p_rng RNG parameter
*
* \return length of data written if successful, or a specific
* error code
*
* \note f_rng may be NULL if RSA is used for signature and the
* signature is made offline (otherwise f_rng is desirable
* for countermeasures against timing attacks).
* ECDSA signatures always require a non-NULL f_rng.
*/
int x509write_crt_der( x509write_cert *ctx, unsigned char *buf, size_t size,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
#if defined(POLARSSL_PEM_WRITE_C)
/**
* \brief Write a built up certificate to a X509 PEM string
*
* \param ctx certificate to write away
* \param buf buffer to write to
* \param size size of the buffer
* \param f_rng RNG function (for signature, see note)
* \param p_rng RNG parameter
*
* \return 0 successful, or a specific error code
*
* \note f_rng may be NULL if RSA is used for signature and the
* signature is made offline (otherwise f_rng is desirable
* for countermeasures against timing attacks).
* ECDSA signatures always require a non-NULL f_rng.
*/
int x509write_crt_pem( x509write_cert *ctx, unsigned char *buf, size_t size,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
#endif /* POLARSSL_PEM_WRITE_C */
#endif /* POLARSSL_X509_CRT_WRITE_C */
#ifdef __cplusplus
}
#endif
#endif /* x509_crt.h */
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