include/mbedtls/x509.h

/**
 * \file x509.h
 *
 * \brief X.509 generic defines and structures
 */
/*
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  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.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
#ifndef MBEDTLS_X509_H
#define MBEDTLS_X509_H

#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#include "asn1.h"
#include "pk.h"

#if defined(MBEDTLS_RSA_C)
#include "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
 * \{
 */
#define MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE              -0x2080  /**< Unavailable feature, e.g. RSA hashing/encryption combination. */
#define MBEDTLS_ERR_X509_UNKNOWN_OID                      -0x2100  /**< Requested OID is unknown. */
#define MBEDTLS_ERR_X509_INVALID_FORMAT                   -0x2180  /**< The CRT/CRL/CSR format is invalid, e.g. different type expected. */
#define MBEDTLS_ERR_X509_INVALID_VERSION                  -0x2200  /**< The CRT/CRL/CSR version element is invalid. */
#define MBEDTLS_ERR_X509_INVALID_SERIAL                   -0x2280  /**< The serial tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_ALG                      -0x2300  /**< The algorithm tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_NAME                     -0x2380  /**< The name tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_DATE                     -0x2400  /**< The date tag or value is invalid. */
#define MBEDTLS_ERR_X509_INVALID_SIGNATURE                -0x2480  /**< The signature tag or value invalid. */
#define MBEDTLS_ERR_X509_INVALID_EXTENSIONS               -0x2500  /**< The extension tag or value is invalid. */
#define MBEDTLS_ERR_X509_UNKNOWN_VERSION                  -0x2580  /**< CRT/CRL/CSR has an unsupported version number. */
#define MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG                  -0x2600  /**< Signature algorithm (oid) is unsupported. */
#define MBEDTLS_ERR_X509_SIG_MISMATCH                     -0x2680  /**< Signature algorithms do not match. (see \c ::mbedtls_x509_crt sig_oid) */
#define MBEDTLS_ERR_X509_CERT_VERIFY_FAILED               -0x2700  /**< Certificate verification failed, e.g. CRL, CA or signature check failed. */
#define MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT              -0x2780  /**< Format not recognized as DER or PEM. */
#define MBEDTLS_ERR_X509_BAD_INPUT_DATA                   -0x2800  /**< Input invalid. */
#define MBEDTLS_ERR_X509_ALLOC_FAILED                     -0x2880  /**< Allocation of memory failed. */
#define MBEDTLS_ERR_X509_FILE_IO_ERROR                    -0x2900  /**< Read/write of file failed. */
#define MBEDTLS_ERR_X509_BUFFER_TOO_SMALL                 -0x2980  /**< Destination buffer is too small. */
#define MBEDTLS_ERR_X509_FATAL_ERROR                      -0x3000  /**< A fatal error occurred, eg the chain is too long or the vrfy callback failed. */
/* \} name */

/**
 * \name X509 Verify codes
 * \{
 */
/* Reminder: update x509_crt_verify_strings[] in library/x509_crt.c */
/* Reminder: update X509_BADCERT_FI_EXTRA in library/x509_crt.c if using more
 * that 24 bits */
#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 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.
 */
#define MBEDTLS_X509_EXT_AUTHORITY_KEY_IDENTIFIER    (1 << 0)
#define MBEDTLS_X509_EXT_SUBJECT_KEY_IDENTIFIER      (1 << 1)
#define MBEDTLS_X509_EXT_KEY_USAGE                   (1 << 2)
#define MBEDTLS_X509_EXT_CERTIFICATE_POLICIES        (1 << 3)
#define MBEDTLS_X509_EXT_POLICY_MAPPINGS             (1 << 4)
#define MBEDTLS_X509_EXT_SUBJECT_ALT_NAME            (1 << 5)    /* Supported (DNS) */
#define MBEDTLS_X509_EXT_ISSUER_ALT_NAME             (1 << 6)
#define MBEDTLS_X509_EXT_SUBJECT_DIRECTORY_ATTRS     (1 << 7)
#define MBEDTLS_X509_EXT_BASIC_CONSTRAINTS           (1 << 8)    /* Supported */
#define MBEDTLS_X509_EXT_NAME_CONSTRAINTS            (1 << 9)
#define MBEDTLS_X509_EXT_POLICY_CONSTRAINTS          (1 << 10)
#define MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE          (1 << 11)
#define MBEDTLS_X509_EXT_CRL_DISTRIBUTION_POINTS     (1 << 12)
#define MBEDTLS_X509_EXT_INIHIBIT_ANYPOLICY          (1 << 13)
#define MBEDTLS_X509_EXT_FRESHEST_CRL                (1 << 14)

#define MBEDTLS_X509_EXT_NS_CERT_TYPE                (1 << 16)

/*
 * 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
 * \{
 */

/**
 * Basic length-value buffer structure
 */
typedef struct mbedtls_x509_buf_raw
{
    unsigned char *p;    /*!< The address of the first byte in the buffer. */
    size_t len;          /*!< The number of Bytes in the buffer.           */
} mbedtls_x509_buf_raw;

/**
 * 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 );

#if defined(MBEDTLS_HAVE_TIME_DATE)
/**
 * \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 );
#endif /* MBEDTLS_HAVE_TIME_DATE */

/**
 * \brief          Free a dynamic linked list presentation of an X.509 name
 *                 as returned e.g. by mbedtls_x509_crt_get_subject().
 *
 * \param name     The address of the first name component. This may
 *                 be \c NULL, in which case this functions returns
 *                 immediately.
 */
void mbedtls_x509_name_free( mbedtls_x509_name *name );

/**
 * \brief          Free a dynamic linked list presentation of an X.509 sequence
 *                 as returned e.g. by mbedtls_x509_crt_get_subject_alt_name().
 *
 * \param seq      The address of the first sequence component. This may
 *                 be \c NULL, in which case this functions returns
 *                 immediately.
 */
static inline void mbedtls_x509_sequence_free( mbedtls_x509_sequence *seq )
{
    mbedtls_asn1_sequence_free( (mbedtls_asn1_sequence*) seq );
}

#if !defined(MBEDTLS_HAVE_TIME_DATE)
static inline int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
{
    ((void) to);
    return( 0 );
}

static inline int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
{
    ((void) from);
    return( 0 );
}
#endif /* !MBEDTLS_HAVE_TIME_DATE */

#if defined(MBEDTLS_SELF_TEST)

/**
 * \brief          Checkup routine
 *
 * \return         0 if successful, or 1 if the test failed
 */
int mbedtls_x509_self_test( int verbose );

#endif /* MBEDTLS_SELF_TEST */

#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 )

#define MBEDTLS_X509_SAFE_SNPRINTF_WITH_CLEANUP             \
    do {                                                    \
        if( ret < 0 || (size_t) ret >= n )                  \
        {                                                   \
            ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;        \
            goto cleanup;                                   \
        }                                                   \
                                                            \
        n -= (size_t) ret;                                  \
        p += (size_t) ret;                                  \
    } while( 0 )

#ifdef __cplusplus
}
#endif

#endif /* x509.h */