| /** |
| * \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 |
| |
| #if !defined(POLARSSL_CONFIG_FILE) |
| #include "config.h" |
| #else |
| #include POLARSSL_CONFIG_FILE |
| #endif |
| |
| #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 */; |
| #if defined(POLARSSL_RSASSA_PSS_CERTIFICATES) |
| x509_buf sig_params; /**< Parameters for the signature algorithm */ |
| #endif |
| |
| 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 */ |