x509v3.h

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#ifndef X509V3_H
#define X509V3_H

#include "asn1.h"

struct x509_algorithm_identifier {
        struct asn1_oid oid;
};

struct x509_name {
        char *cn; /* commonName */
        char *c; /* countryName */
        char *l; /* localityName */
        char *st; /* stateOrProvinceName */
        char *o; /* organizationName */
        char *ou; /* organizationalUnitName */
        char *email; /* emailAddress */

        /* from alternative name extension */
        char *alt_email; /* rfc822Name */
        char *dns; /* dNSName */
        char *uri; /* uniformResourceIdentifier */
        u8 *ip; /* iPAddress */
        size_t ip_len; /* IPv4: 4, IPv6: 16 */
        struct asn1_oid rid; /* registeredID */
};

struct x509_certificate {
        struct x509_certificate *next;
        enum { X509_CERT_V1 = 0, X509_CERT_V2 = 1, X509_CERT_V3 = 2 } version;
        unsigned long serial_number;
        struct x509_algorithm_identifier signature;
        struct x509_name issuer;
        struct x509_name subject;
        os_time_t not_before;
        os_time_t not_after;
        struct x509_algorithm_identifier public_key_alg;
        u8 *public_key;
        size_t public_key_len;
        struct x509_algorithm_identifier signature_alg;
        u8 *sign_value;
        size_t sign_value_len;

        /* Extensions */
        unsigned int extensions_present;
#define X509_EXT_BASIC_CONSTRAINTS              (1 << 0)
#define X509_EXT_PATH_LEN_CONSTRAINT            (1 << 1)
#define X509_EXT_KEY_USAGE                      (1 << 2)
#define X509_EXT_SUBJECT_ALT_NAME               (1 << 3)
#define X509_EXT_ISSUER_ALT_NAME                (1 << 4)

        /* BasicConstraints */
        int ca; /* cA */
        unsigned long path_len_constraint; /* pathLenConstraint */

        /* KeyUsage */
        unsigned long key_usage;
#define X509_KEY_USAGE_DIGITAL_SIGNATURE        (1 << 0)
#define X509_KEY_USAGE_NON_REPUDIATION          (1 << 1)
#define X509_KEY_USAGE_KEY_ENCIPHERMENT         (1 << 2)
#define X509_KEY_USAGE_DATA_ENCIPHERMENT        (1 << 3)
#define X509_KEY_USAGE_KEY_AGREEMENT            (1 << 4)
#define X509_KEY_USAGE_KEY_CERT_SIGN            (1 << 5)
#define X509_KEY_USAGE_CRL_SIGN                 (1 << 6)
#define X509_KEY_USAGE_ENCIPHER_ONLY            (1 << 7)
#define X509_KEY_USAGE_DECIPHER_ONLY            (1 << 8)

        /*
         * The DER format certificate follows struct x509_certificate. These
         * pointers point to that buffer.
         */
        const u8 *cert_start;
        size_t cert_len;
        const u8 *tbs_cert_start;
        size_t tbs_cert_len;
};

enum {
        X509_VALIDATE_OK,
        X509_VALIDATE_BAD_CERTIFICATE,
        X509_VALIDATE_UNSUPPORTED_CERTIFICATE,
        X509_VALIDATE_CERTIFICATE_REVOKED,
        X509_VALIDATE_CERTIFICATE_EXPIRED,
        X509_VALIDATE_CERTIFICATE_UNKNOWN,
        X509_VALIDATE_UNKNOWN_CA
};

#ifdef CONFIG_INTERNAL_X509

void x509_certificate_free(struct x509_certificate *cert);
struct x509_certificate * x509_certificate_parse(const u8 *buf, size_t len);
void x509_name_string(struct x509_name *name, char *buf, size_t len);
int x509_name_compare(struct x509_name *a, struct x509_name *b);
void x509_certificate_chain_free(struct x509_certificate *cert);
int x509_certificate_check_signature(struct x509_certificate *issuer,
                                     struct x509_certificate *cert);
int x509_certificate_chain_validate(struct x509_certificate *trusted,
                                    struct x509_certificate *chain,
                                    int *reason);
struct x509_certificate *
x509_certificate_get_subject(struct x509_certificate *chain,
                             struct x509_name *name);
int x509_certificate_self_signed(struct x509_certificate *cert);

#else /* CONFIG_INTERNAL_X509 */

static inline void x509_certificate_free(struct x509_certificate *cert)
{
}

static inline struct x509_certificate *
x509_certificate_parse(const u8 *buf, size_t len)
{
        return NULL;
}

static inline void x509_name_string(struct x509_name *name, char *buf,
                                    size_t len)
{
        if (len)
                buf[0] = '\0';
}

static inline void x509_certificate_chain_free(struct x509_certificate *cert)
{
}

static inline int
x509_certificate_chain_validate(struct x509_certificate *trusted,
                                struct x509_certificate *chain,
                                int *reason)
{
        return -1;
}

static inline struct x509_certificate *
x509_certificate_get_subject(struct x509_certificate *chain,
                             struct x509_name *name)
{
        return NULL;
}

static inline int x509_certificate_self_signed(struct x509_certificate *cert)
{
        return -1;
}

#endif /* CONFIG_INTERNAL_X509 */

#endif /* X509V3_H */