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mbedtls/include/mbedtls/x509.h
Gilles Peskine 842edf474c Make many fields of X.509 structures public 
The structures mbedtls_x509_time, mbedtls_x509_crl_entry, mbedtls_x509_crl,
mbedtls_x509_crt, mbedtls_x509_san_other_name,
mbedtls_x509_subject_alternative_name, mbedtls_x509_csr are designed to
expose the result of parsing X.509 data. Document many of their fields as
being publicly readable.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-08-31 22:54:27 +02:00

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/**
* \file x509.h
*
* \brief X.509 generic defines and structures
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBEDTLS_X509_H
#define MBEDTLS_X509_H
#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include "mbedtls/asn1.h"
#include "mbedtls/pk.h"
#if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h"
#endif
/**
* \addtogroup x509_module
* \{
*/
#if !defined(MBEDTLS_X509_MAX_INTERMEDIATE_CA)
/**
* Maximum number of intermediate CAs in a verification chain.
* That is, maximum length of the chain, excluding the end-entity certificate
* and the trusted root certificate.
*
* Set this to a low value to prevent an adversary from making you waste
* resources verifying an overlong certificate chain.
*/
#define MBEDTLS_X509_MAX_INTERMEDIATE_CA 8
#endif
/**
* \name X509 Error codes
* \{
*/
/** Unavailable feature, e.g. RSA hashing/encryption combination. */
#define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE -0x2080
/** Requested OID is unknown. */
#define MBEDTLS_ERR_X509_UNKNOWN_OID -0x2100
/** The CRT/CRL/CSR format is invalid, e.g. different type expected. */
#define MBEDTLS_ERR_X509_INVALID_FORMAT -0x2180
/** The CRT/CRL/CSR version element is invalid. */
#define MBEDTLS_ERR_X509_INVALID_VERSION -0x2200
/** The serial tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_SERIAL -0x2280
/** The algorithm tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_ALG -0x2300
/** The name tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_NAME -0x2380
/** The date tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_DATE -0x2400
/** The signature tag or value invalid. */
#define MBEDTLS_ERR_X509_INVALID_SIGNATURE -0x2480
/** The extension tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_EXTENSIONS -0x2500
/** CRT/CRL/CSR has an unsupported version number. */
#define MBEDTLS_ERR_X509_UNKNOWN_VERSION -0x2580
/** Signature algorithm (oid) is unsupported. */
#define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG -0x2600
/** Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
#define MBEDTLS_ERR_X509_SIG_MISMATCH -0x2680
/** Certificate verification failed, e.g. CRL, CA or signature check failed. */
#define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED -0x2700
/** Format not recognized as DER or PEM. */
#define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT -0x2780
/** Input invalid. */
#define MBEDTLS_ERR_X509_BAD_INPUT_DATA -0x2800
/** Allocation of memory failed. */
#define MBEDTLS_ERR_X509_ALLOC_FAILED -0x2880
/** Read/write of file failed. */
#define MBEDTLS_ERR_X509_FILE_IO_ERROR -0x2900
/** Destination buffer is too small. */
#define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL -0x2980
/** A fatal error occurred, eg the chain is too long or the vrfy callback failed. */
#define MBEDTLS_ERR_X509_FATAL_ERROR -0x3000
/* \} name */
/**
* \name X509 Verify codes
* \{
*/
/* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
#define MBEDTLS_X509_BADCERT_EXPIRED 0x01 /**< The certificate validity has expired. */
#define MBEDTLS_X509_BADCERT_REVOKED 0x02 /**< The certificate has been revoked (is on a CRL). */
#define MBEDTLS_X509_BADCERT_CN_MISMATCH 0x04 /**< The certificate Common Name (CN) does not match with the expected CN. */
#define MBEDTLS_X509_BADCERT_NOT_TRUSTED 0x08 /**< The certificate is not correctly signed by the trusted CA. */
#define MBEDTLS_X509_BADCRL_NOT_TRUSTED 0x10 /**< The CRL is not correctly signed by the trusted CA. */
#define MBEDTLS_X509_BADCRL_EXPIRED 0x20 /**< The CRL is expired. */
#define MBEDTLS_X509_BADCERT_MISSING 0x40 /**< Certificate was missing. */
#define MBEDTLS_X509_BADCERT_SKIP_VERIFY 0x80 /**< Certificate verification was skipped. */
#define MBEDTLS_X509_BADCERT_OTHER 0x0100 /**< Other reason (can be used by verify callback) */
#define MBEDTLS_X509_BADCERT_FUTURE 0x0200 /**< The certificate validity starts in the future. */
#define MBEDTLS_X509_BADCRL_FUTURE 0x0400 /**< The CRL is from the future */
#define MBEDTLS_X509_BADCERT_KEY_USAGE 0x0800 /**< Usage does not match the keyUsage extension. */
#define MBEDTLS_X509_BADCERT_EXT_KEY_USAGE 0x1000 /**< Usage does not match the extendedKeyUsage extension. */
#define MBEDTLS_X509_BADCERT_NS_CERT_TYPE 0x2000 /**< Usage does not match the nsCertType extension. */
#define MBEDTLS_X509_BADCERT_BAD_MD 0x4000 /**< The certificate is signed with an unacceptable hash. */
#define MBEDTLS_X509_BADCERT_BAD_PK 0x8000 /**< The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
#define MBEDTLS_X509_BADCERT_BAD_KEY 0x010000 /**< The certificate is signed with an unacceptable key (eg bad curve, RSA too short). */
#define MBEDTLS_X509_BADCRL_BAD_MD 0x020000 /**< The CRL is signed with an unacceptable hash. */
#define MBEDTLS_X509_BADCRL_BAD_PK 0x040000 /**< The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA). */
#define MBEDTLS_X509_BADCRL_BAD_KEY 0x080000 /**< The CRL is signed with an unacceptable key (eg bad curve, RSA too short). */
/* \} name */
/* \} addtogroup x509_module */
/*
* X.509 v3 Subject Alternative Name types.
* otherName [0] OtherName,
* rfc822Name [1] IA5String,
* dNSName [2] IA5String,
* x400Address [3] ORAddress,
* directoryName [4] Name,
* ediPartyName [5] EDIPartyName,
* uniformResourceIdentifier [6] IA5String,
* iPAddress [7] OCTET STRING,
* registeredID [8] OBJECT IDENTIFIER
*/
#define MBEDTLS_X509_SAN_OTHER_NAME 0
#define MBEDTLS_X509_SAN_RFC822_NAME 1
#define MBEDTLS_X509_SAN_DNS_NAME 2
#define MBEDTLS_X509_SAN_X400_ADDRESS_NAME 3
#define MBEDTLS_X509_SAN_DIRECTORY_NAME 4
#define MBEDTLS_X509_SAN_EDI_PARTY_NAME 5
#define MBEDTLS_X509_SAN_UNIFORM_RESOURCE_IDENTIFIER 6
#define MBEDTLS_X509_SAN_IP_ADDRESS 7
#define MBEDTLS_X509_SAN_REGISTERED_ID 8
/*
* X.509 v3 Key Usage Extension flags
* Reminder: update x509_info_key_usage() when adding new flags.
*/
#define MBEDTLS_X509_KU_DIGITAL_SIGNATURE (0x80) /* bit 0 */
#define MBEDTLS_X509_KU_NON_REPUDIATION (0x40) /* bit 1 */
#define MBEDTLS_X509_KU_KEY_ENCIPHERMENT (0x20) /* bit 2 */
#define MBEDTLS_X509_KU_DATA_ENCIPHERMENT (0x10) /* bit 3 */
#define MBEDTLS_X509_KU_KEY_AGREEMENT (0x08) /* bit 4 */
#define MBEDTLS_X509_KU_KEY_CERT_SIGN (0x04) /* bit 5 */
#define MBEDTLS_X509_KU_CRL_SIGN (0x02) /* bit 6 */
#define MBEDTLS_X509_KU_ENCIPHER_ONLY (0x01) /* bit 7 */
#define MBEDTLS_X509_KU_DECIPHER_ONLY (0x8000) /* bit 8 */
/*
* Netscape certificate types
* (http://www.mozilla.org/projects/security/pki/nss/tech-notes/tn3.html)
*/
#define MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT (0x80) /* bit 0 */
#define MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER (0x40) /* bit 1 */
#define MBEDTLS_X509_NS_CERT_TYPE_EMAIL (0x20) /* bit 2 */
#define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING (0x10) /* bit 3 */
#define MBEDTLS_X509_NS_CERT_TYPE_RESERVED (0x08) /* bit 4 */
#define MBEDTLS_X509_NS_CERT_TYPE_SSL_CA (0x04) /* bit 5 */
#define MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA (0x02) /* bit 6 */
#define MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA (0x01) /* bit 7 */
/*
* X.509 extension types
*
* Comments refer to the status for using certificates. Status can be
* different for writing certificates or reading CRLs or CSRs.
*
* Those are defined in oid.h as oid.c needs them in a data structure. Since
* these were previously defined here, let's have aliases for compatibility.
*/
#define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_AUTHORITY_KEY_IDENTIFIER
#define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER MBEDTLS_OID_X509_EXT_SUBJECT_KEY_IDENTIFIER
#define MBEDTLS_X509_EXT_KEY_USAGE MBEDTLS_OID_X509_EXT_KEY_USAGE
#define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES
#define MBEDTLS_X509_EXT_POLICY_MAPPINGS MBEDTLS_OID_X509_EXT_POLICY_MAPPINGS
#define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME MBEDTLS_OID_X509_EXT_SUBJECT_ALT_NAME /* Supported (DNS) */
#define MBEDTLS_X509_EXT_ISSUER_ALT_NAME MBEDTLS_OID_X509_EXT_ISSUER_ALT_NAME
#define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS MBEDTLS_OID_X509_EXT_SUBJECT_DIRECTORY_ATTRS
#define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS MBEDTLS_OID_X509_EXT_BASIC_CONSTRAINTS /* Supported */
#define MBEDTLS_X509_EXT_NAME_CONSTRAINTS MBEDTLS_OID_X509_EXT_NAME_CONSTRAINTS
#define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS MBEDTLS_OID_X509_EXT_POLICY_CONSTRAINTS
#define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE MBEDTLS_OID_X509_EXT_EXTENDED_KEY_USAGE
#define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS MBEDTLS_OID_X509_EXT_CRL_DISTRIBUTION_POINTS
#define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY MBEDTLS_OID_X509_EXT_INIHIBIT_ANYPOLICY
#define MBEDTLS_X509_EXT_FRESHEST_CRL MBEDTLS_OID_X509_EXT_FRESHEST_CRL
#define MBEDTLS_X509_EXT_NS_CERT_TYPE MBEDTLS_OID_X509_EXT_NS_CERT_TYPE
/*
* Storage format identifiers
* Recognized formats: PEM and DER
*/
#define MBEDTLS_X509_FORMAT_DER 1
#define MBEDTLS_X509_FORMAT_PEM 2
#define MBEDTLS_X509_MAX_DN_NAME_SIZE 256 /**< Maximum value size of a DN entry */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \addtogroup x509_module
* \{ */
/**
* \name Structures for parsing X.509 certificates, CRLs and CSRs
* \{
*/
/**
* Type-length-value structure that allows for ASN1 using DER.
*/
typedef mbedtls_asn1_buf mbedtls_x509_buf;
/**
* Container for ASN1 bit strings.
*/
typedef mbedtls_asn1_bitstring mbedtls_x509_bitstring;
/**
* Container for ASN1 named information objects.
* It allows for Relative Distinguished Names (e.g. cn=localhost,ou=code,etc.).
*/
typedef mbedtls_asn1_named_data mbedtls_x509_name;
/**
* Container for a sequence of ASN.1 items
*/
typedef mbedtls_asn1_sequence mbedtls_x509_sequence;
/** Container for date and time (precision in seconds). */
typedef struct mbedtls_x509_time
{
int year, mon, day; /**< Date. */
int hour, min, sec; /**< Time. */
}
mbedtls_x509_time;
/** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
/** \} addtogroup x509_module */
/**
* \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 length of the string written (not including the
* terminated nul byte), or a negative error code.
*/
int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn );
/**
* \brief Store the certificate serial 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 serial The X509 serial to represent
*
* \return The length of the string written (not including the
* terminated nul byte), or a negative error code.
*/
int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial );
/**
* \brief Check a given mbedtls_x509_time against the system time
* and tell if it's in the past.
*
* \note Intended usage is "if( is_past( valid_to ) ) ERROR".
* Hence the return value of 1 if on internal errors.
*
* \param to mbedtls_x509_time to check
*
* \return 1 if the given time is in the past or an error occurred,
* 0 otherwise.
*/
int mbedtls_x509_time_is_past( const mbedtls_x509_time *to );
/**
* \brief Check a given mbedtls_x509_time against the system time
* and tell if it's in the future.
*
* \note Intended usage is "if( is_future( valid_from ) ) ERROR".
* Hence the return value of 1 if on internal errors.
*
* \param from mbedtls_x509_time to check
*
* \return 1 if the given time is in the future or an error occurred,
* 0 otherwise.
*/
int mbedtls_x509_time_is_future( const mbedtls_x509_time *from );
/*
* Internal module functions. You probably do not want to use these unless you
* know you do.
*/
int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
mbedtls_x509_name *cur );
int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *alg );
int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *alg, mbedtls_x509_buf *params );
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
int *salt_len );
#endif
int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig );
int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
void **sig_opts );
int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
mbedtls_x509_time *t );
int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *serial );
int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
mbedtls_x509_buf *ext, int tag );
#if !defined(MBEDTLS_X509_REMOVE_INFO)
int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
const void *sig_opts );
#endif
int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name );
int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name );
int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
int critical, const unsigned char *val,
size_t val_len );
int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
mbedtls_asn1_named_data *first );
int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
mbedtls_asn1_named_data *first );
int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
const char *oid, size_t oid_len,
unsigned char *sig, size_t size );
#define MBEDTLS_X509_SAFE_SNPRINTF \
do { \
if( ret < 0 || (size_t) ret >= n ) \
return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); \
\
n -= (size_t) ret; \
p += (size_t) ret; \
} while( 0 )
#ifdef __cplusplus
}
#endif
#endif /* x509.h */
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