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mbedtls/include/polarssl/x509.h

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/**
* \file x509.h
*
* \brief X.509 certificate and private key decoding
*
* Copyright (C) 2006-2010, 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_H
#define POLARSSL_X509_H
#include "polarssl/rsa.h"
#include "polarssl/dhm.h"
/**
* @addtogroup x509_module
* @{
*/
/**
* @name ASN1 Error codes
* These error codes are OR'ed to X509 error codes for
* higher error granularity.
* ASN1 is a standard to specify data structures.
* @{
*/
#define POLARSSL_ERR_ASN1_OUT_OF_DATA 0x0014 /**< Out of data when parsing an ASN1 data structure. */
#define POLARSSL_ERR_ASN1_UNEXPECTED_TAG 0x0016 /**< ASN1 tag was of an unexpected value. */
#define POLARSSL_ERR_ASN1_INVALID_LENGTH 0x0018 /**< Error when trying to determine the length or invalid length. */
#define POLARSSL_ERR_ASN1_LENGTH_MISMATCH 0x001A /**< Actual length differs from expected length. */
#define POLARSSL_ERR_ASN1_INVALID_DATA 0x001C /**< Data is invalid. (not used) */
/* @} name */
/**
* @name X509 Error codes
* @{
*/
#define POLARSSL_ERR_X509_FEATURE_UNAVAILABLE -0x0020 /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
#define POLARSSL_ERR_X509_CERT_INVALID_PEM -0x0040 /**< The PEM-encoded certificate contains invalid elements, e.g. invalid character. */
#define POLARSSL_ERR_X509_CERT_INVALID_FORMAT -0x0060 /**< The certificate format is invalid, e.g. different type expected. */
#define POLARSSL_ERR_X509_CERT_INVALID_VERSION -0x0080 /**< The certificate version element is invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_SERIAL -0x00A0 /**< The serial tag or value is invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_ALG -0x00C0 /**< The algorithm tag or value is invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_NAME -0x00E0 /**< The name tag or value is invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_DATE -0x0100 /**< The date tag or value is invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_PUBKEY -0x0120 /**< The pubkey tag or value is invalid (only RSA is supported). */
#define POLARSSL_ERR_X509_CERT_INVALID_SIGNATURE -0x0140 /**< The signature tag or value invalid. */
#define POLARSSL_ERR_X509_CERT_INVALID_EXTENSIONS -0x0160 /**< The extension tag or value is invalid. */
#define POLARSSL_ERR_X509_CERT_UNKNOWN_VERSION -0x0180 /**< Certificate or CRL has an unsupported version number. */
#define POLARSSL_ERR_X509_CERT_UNKNOWN_SIG_ALG -0x01A0 /**< Signature algorithm (oid) is unsupported. */
#define POLARSSL_ERR_X509_CERT_UNKNOWN_PK_ALG -0x01C0 /**< Public key algorithm is unsupported (only RSA is supported). */
#define POLARSSL_ERR_X509_CERT_SIG_MISMATCH -0x01E0 /**< Certificate signature algorithms do not match. (see \c ::x509_cert sig_oid) */
#define POLARSSL_ERR_X509_CERT_VERIFY_FAILED -0x0200 /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
#define POLARSSL_ERR_X509_KEY_INVALID_PEM -0x0220 /**< PEM key string is not as expected. */
#define POLARSSL_ERR_X509_KEY_INVALID_VERSION -0x0240 /**< Unsupported RSA key version */
#define POLARSSL_ERR_X509_KEY_INVALID_FORMAT -0x0260 /**< Invalid RSA key tag or value. */
#define POLARSSL_ERR_X509_KEY_INVALID_ENC_IV -0x0280 /**< RSA IV is not in hex-format. */
#define POLARSSL_ERR_X509_KEY_UNKNOWN_ENC_ALG -0x02A0 /**< Unsupported key encryption algorithm. */
#define POLARSSL_ERR_X509_KEY_PASSWORD_REQUIRED -0x02C0 /**< Private key password can't be empty. */
#define POLARSSL_ERR_X509_KEY_PASSWORD_MISMATCH -0x02E0 /**< Given private key password does not allow for correct decryption. */
#define POLARSSL_ERR_X509_POINT_ERROR -0x0300 /**< Not used. */
#define POLARSSL_ERR_X509_VALUE_TO_LENGTH -0x0320 /**< Not used. */
/* @} name */
/**
* @name X509 Verify codes
* @{
*/
#define BADCERT_EXPIRED 1 /**< The certificate validity has expired. */
#define BADCERT_REVOKED 2 /**< The certificate has been revoked (is on a CRL). */
#define BADCERT_CN_MISMATCH 4 /**< The certificate Common Name (CN) does not match with the expected CN. */
#define BADCERT_NOT_TRUSTED 8 /**< The certificate is not correctly signed by the trusted CA. */
#define BADCRL_NOT_TRUSTED 16 /**< CRL is not correctly signed by the trusted CA. */
#define BADCRL_EXPIRED 32 /**< CRL is expired. */
/* @} name */
/**
* @name DER constants
* These constants comply with DER encoded the ANS1 type tags.
* DER encoding uses hexadecimal representation.
* An example DER sequence is:\n
* - 0x02 -- tag indicating INTEGER
* - 0x01 -- length in octets
* - 0x05 -- value
* Such sequences are typically read into \c ::x509_buf.
* @{
*/
#define ASN1_BOOLEAN 0x01
#define ASN1_INTEGER 0x02
#define ASN1_BIT_STRING 0x03
#define ASN1_OCTET_STRING 0x04
#define ASN1_NULL 0x05
#define ASN1_OID 0x06
#define ASN1_UTF8_STRING 0x0C
#define ASN1_SEQUENCE 0x10
#define ASN1_SET 0x11
#define ASN1_PRINTABLE_STRING 0x13
#define ASN1_T61_STRING 0x14
#define ASN1_IA5_STRING 0x16
#define ASN1_UTC_TIME 0x17
#define ASN1_GENERALIZED_TIME 0x18
#define ASN1_UNIVERSAL_STRING 0x1C
#define ASN1_BMP_STRING 0x1E
#define ASN1_PRIMITIVE 0x00
#define ASN1_CONSTRUCTED 0x20
#define ASN1_CONTEXT_SPECIFIC 0x80
/* @} name */
/* @} addtogroup x509_module */
/*
* various object identifiers
*/
#define X520_COMMON_NAME 3
#define X520_COUNTRY 6
#define X520_LOCALITY 7
#define X520_STATE 8
#define X520_ORGANIZATION 10
#define X520_ORG_UNIT 11
#define PKCS9_EMAIL 1
#define X509_OUTPUT_DER 0x01
#define X509_OUTPUT_PEM 0x02
#define PEM_LINE_LENGTH 72
#define X509_ISSUER 0x01
#define X509_SUBJECT 0x02
#define OID_X520 "\x55\x04"
#define OID_CN "\x55\x04\x03"
#define OID_PKCS1 "\x2A\x86\x48\x86\xF7\x0D\x01\x01"
#define OID_PKCS1_RSA "\x2A\x86\x48\x86\xF7\x0D\x01\x01\x01"
#define OID_PKCS1_RSA_SHA "\x2A\x86\x48\x86\xF7\x0D\x01\x01\x05"
#define OID_PKCS9 "\x2A\x86\x48\x86\xF7\x0D\x01\x09"
#define OID_PKCS9_EMAIL "\x2A\x86\x48\x86\xF7\x0D\x01\x09\x01"
/**
* @addtogroup x509_module
* @{ */
/**
* @name Structures for parsing X.509 certificates and CRLs
* @{
*/
/**
* Type-length-value structure that allows for ASN1 using DER.
*/
typedef struct _x509_buf
{
int tag; /**< ASN1 type, e.g. ASN1_UTF8_STRING. */
int len; /**< ASN1 length, e.g. in octets. */
unsigned char *p; /**< ASN1 data, e.g. in ASCII. */
}
x509_buf;
/**
* Container for ASN1 named information objects.
* It allows for Relative Distinguished Names (e.g. cn=polarssl,ou=code,etc.).
*/
typedef struct _x509_name
{
x509_buf oid; /**< The object identifier. */
x509_buf val; /**< The named value. */
struct _x509_name *next; /**< The next named information object. */
}
x509_name;
/** Container for date and time (precision in seconds). */
typedef struct _x509_time
{
int year, mon, day; /**< Date. */
int hour, min, sec; /**< Time. */
}
x509_time;
/**
* Container for an X.509 certificate. The certificate may be chained.
*/
typedef struct _x509_cert
{
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. */
x509_buf pk_oid; /**< Subject public key info. Includes the public key algorithm and the key itself. */
rsa_context rsa; /**< Container for the RSA context. Only RSA is supported for public keys at this time. */
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. Only Basic Contraints are supported at this time. */
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. */
x509_buf sig_oid2; /**< Signature algorithm. Must match sig_oid1. */
x509_buf sig; /**< Signature: hash of the tbs part signed with the private key. */
int sig_alg; /**< Internal representation of the signature algorithm, e.g. SIG_RSA_MD2 */
struct _x509_cert *next; /**< Next certificate in the CA-chain. */
}
x509_cert;
/**
* Certificate revocation list entry.
* Contains the CA-specific serial numbers and revocation dates.
*/
typedef struct _x509_crl_entry
{
x509_buf raw;
x509_buf serial;
x509_time revocation_date;
x509_buf entry_ext;
struct _x509_crl_entry *next;
}
x509_crl_entry;
/**
* Certificate revocation list structure.
* Every CRL may have multiple entries.
*/
typedef struct _x509_crl
{
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;
x509_buf sig_oid1;
x509_buf issuer_raw; /**< The raw issuer data (DER). */
x509_name issuer; /**< The parsed issuer data (named information object). */
x509_time this_update;
x509_time next_update;
x509_crl_entry entry; /**< The CRL entries containing the certificate revocation times for this CA. */
x509_buf crl_ext;
x509_buf sig_oid2;
x509_buf sig;
int sig_alg;
struct _x509_crl *next;
}
x509_crl;
/** @} name Structures for parsing X.509 certificates and CRLs */
/** @} addtogroup x509_module */
/**
* @name Structures for writing X.509 certificates.
* XvP: commented out as they are not used.
* - <tt>typedef struct _x509_node x509_node;</tt>
* - <tt>typedef struct _x509_raw x509_raw;</tt>
*/
/*
typedef struct _x509_node
{
unsigned char *data;
unsigned char *p;
unsigned char *end;
size_t len;
}
x509_node;
typedef struct _x509_raw
{
x509_node raw;
x509_node tbs;
x509_node version;
x509_node serial;
x509_node tbs_signalg;
x509_node issuer;
x509_node validity;
x509_node subject;
x509_node subpubkey;
x509_node signalg;
x509_node sign;
}
x509_raw;
*/
#ifdef __cplusplus
extern "C" {
#endif
/**
* @name Functions to read in DHM parameters, a certificate, CRL or private RSA key
* @{
*/
/** @ingroup x509_module */
/**
* \brief Parse one or more certificates and add them
* to the chained list
*
* \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 successful, or a specific X509 error code
*/
int x509parse_crt( x509_cert *chain, const unsigned char *buf, int buflen );
/** @ingroup x509_module */
/**
* \brief Load one or more certificates and add them
* to the chained list
*
* \param chain points to the start of the chain
* \param path filename to read the certificates from
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_crtfile( x509_cert *chain, const char *path );
/** @ingroup x509_module */
/**
* \brief Parse one or more CRLs and add them
* to the chained list
*
* \param chain points to the start of the chain
* \param buf buffer holding the CRL data
* \param buflen size of the buffer
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_crl( x509_crl *chain, const unsigned char *buf, int buflen );
/** @ingroup x509_module */
/**
* \brief Load one or more CRLs and add them
* to the chained list
*
* \param chain points to the start of the chain
* \param path filename to read the CRLs from
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_crlfile( x509_crl *chain, const char *path );
/** @ingroup x509_module */
/**
* \brief Parse a private RSA key
*
* \param rsa RSA context to be initialized
* \param key input buffer
* \param keylen size of the buffer
* \param pwd password for decryption (optional)
* \param pwdlen size of the password
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_key( rsa_context *rsa,
const unsigned char *key, int keylen,
const unsigned char *pwd, int pwdlen );
/** @ingroup x509_module */
/**
* \brief Load and parse a private RSA key
*
* \param rsa RSA context to be initialized
* \param path filename to read the private key from
* \param password password to decrypt the file (can be NULL)
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_keyfile( rsa_context *rsa, const char *path,
const char *password );
/** @ingroup x509_module */
/**
* \brief Parse DHM parameters
*
* \param dhm DHM context to be initialized
* \param dhmin input buffer
* \param dhminlen size of the buffer
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_dhm( dhm_context *dhm, const unsigned char *dhmin, int dhminlen );
/** @ingroup x509_module */
/**
* \brief Load and parse DHM parameters
*
* \param dhm DHM context to be initialized
* \param path filename to read the DHM Parameters from
*
* \return 0 if successful, or a specific X509 error code
*/
int x509parse_dhmfile( dhm_context *rsa, const char *path );
/** @} name Functions to read in DHM parameters, a certificate, CRL or private RSA key */
/**
* \brief Store the certificate DN in printable form into buf;
* no more than size characters will be written.
*
* \param buf Buffer to write to
* \param size Maximum size of buffer
* \param dn The X509 name to represent
*
* \return The amount of data written to the buffer, or -1 in
* case of an error.
*/
int x509parse_dn_gets( char *buf, size_t size, const x509_name *dn );
/**
* \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 x509parse_cert_info( char *buf, size_t size, const char *prefix,
const x509_cert *crt );
/**
* \brief Returns an informational string about the
* CRL.
*
* \param buf Buffer to write to
* \param size Maximum size of buffer
* \param prefix A line prefix
* \param crl The X509 CRL to represent
*
* \return The amount of data written to the buffer, or -1 in
* case of an error.
*/
int x509parse_crl_info( char *buf, size_t size, const char *prefix,
const x509_crl *crl );
/**
* \brief Check a given x509_time against the system time and check
* if it is valid.
*
* \param time x509_time to check
*
* \return Return 0 if the x509_time is still valid,
* or 1 otherwise.
*/
int x509parse_time_expired( const x509_time *time );
/**
* @name Functions to verify a certificate
* @{
*/
/** @ingroup x509_module */
/**
* \brief Verify the certificate signature
*
* \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
*
* \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
*
* \note TODO: add two arguments, depth and crl
*/
int x509parse_verify( x509_cert *crt,
x509_cert *trust_ca,
x509_crl *ca_crl,
const char *cn, int *flags );
/** @} name Functions to verify a certificate */
/**
* @name Functions to clear a certificate, CRL or private RSA key
* @{
*/
/** @ingroup x509_module */
/**
* \brief Unallocate all certificate data
*
* \param crt Certificate chain to free
*/
void x509_free( x509_cert *crt );
/** @ingroup x509_module */
/**
* \brief Unallocate all CRL data
*
* \param crl CRL chain to free
*/
void x509_crl_free( x509_crl *crl );
/** @} name Functions to clear a certificate, CRL or private RSA key */
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int x509_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* x509.h */
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