ssl_util_ssl.c

Apache官方在今天放出产品系列2.2的最新版本2.2.11的源码包 最流行的HTTP服务器软件之一

*/

/* check whether cert contains extended key usage with a SGC tag */
BOOL SSL_X509_isSGC(X509 *cert)
{
#ifdef HAVE_SSL_X509V3_EXT_d2i
    X509_EXTENSION *ext;
    int ext_nid;
    STACK *sk;
    BOOL is_sgc;
    int idx;
    int i;

    is_sgc = FALSE;
    idx = X509_get_ext_by_NID(cert, NID_ext_key_usage, -1);
    if (idx >= 0) {
        ext = X509_get_ext(cert, idx);
        if ((sk = (STACK *)X509V3_EXT_d2i(ext)) != NULL) {
            for (i = 0; i < sk_num(sk); i++) {
                ext_nid = OBJ_obj2nid((ASN1_OBJECT *)sk_value(sk, i));
                if (ext_nid == NID_ms_sgc || ext_nid == NID_ns_sgc) {
                    is_sgc = TRUE;
                    break;
                }
            }
        }
    }
    return is_sgc;
#else
    return FALSE;
#endif
}

/* retrieve basic constraints ingredients */
BOOL SSL_X509_getBC(X509 *cert, int *ca, int *pathlen)
{
#ifdef HAVE_SSL_X509V3_EXT_d2i
    X509_EXTENSION *ext;
    BASIC_CONSTRAINTS *bc;
    int idx;
    BIGNUM *bn = NULL;
    char *cp;

    if ((idx = X509_get_ext_by_NID(cert, NID_basic_constraints, -1)) < 0)
        return FALSE;
    ext = X509_get_ext(cert, idx);
    if (ext == NULL)
        return FALSE;
    if ((bc = (BASIC_CONSTRAINTS *)X509V3_EXT_d2i(ext)) == NULL)
        return FALSE;
    *ca = bc->ca;
    *pathlen = -1 /* unlimited */;
    if (bc->pathlen != NULL) {
        if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL)
            return FALSE;
        if ((cp = BN_bn2dec(bn)) == NULL)
            return FALSE;
        *pathlen = atoi(cp);
        free(cp);
        BN_free(bn);
    }
    BASIC_CONSTRAINTS_free(bc);
    return TRUE;
#else
    return FALSE;
#endif
}

/* retrieve subject CommonName of certificate */
BOOL SSL_X509_getCN(apr_pool_t *p, X509 *xs, char **cppCN)
{
    X509_NAME *xsn;
    X509_NAME_ENTRY *xsne;
    int i, nid;
    unsigned char *data_ptr;
    int data_len;

    xsn = X509_get_subject_name(xs);
    for (i = 0; i < sk_X509_NAME_ENTRY_num((STACK_OF(X509_NAME_ENTRY) *)
                                           X509_NAME_get_entries(xsn)); i++) {
        xsne = sk_X509_NAME_ENTRY_value((STACK_OF(X509_NAME_ENTRY) *)
                                         X509_NAME_get_entries(xsn), i);
        nid = OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
        if (nid == NID_commonName) {
            data_ptr = X509_NAME_ENTRY_get_data_ptr(xsne);
            data_len = X509_NAME_ENTRY_get_data_len(xsne);
            *cppCN = apr_palloc(p, data_len+1);
            apr_cpystrn(*cppCN, (char *)data_ptr, data_len+1);
            (*cppCN)[data_len] = NUL;
            ap_xlate_proto_from_ascii(*cppCN, data_len);
            return TRUE;
        }
    }
    return FALSE;
}

/*  _________________________________________________________________
**
**  Low-Level CA Certificate Loading
**  _________________________________________________________________
*/

BOOL SSL_X509_INFO_load_file(apr_pool_t *ptemp,
                             STACK_OF(X509_INFO) *sk,
                             const char *filename)
{
    BIO *in;

    if (!(in = BIO_new(BIO_s_file()))) {
        return FALSE;
    }

    if (BIO_read_filename(in, MODSSL_PCHAR_CAST filename) <= 0) {
        BIO_free(in);
        return FALSE;
    }

    ERR_clear_error();

    modssl_PEM_X509_INFO_read_bio(in, sk, NULL, NULL);

    BIO_free(in);

    return TRUE;
}

BOOL SSL_X509_INFO_load_path(apr_pool_t *ptemp,
                             STACK_OF(X509_INFO) *sk,
                             const char *pathname)
{
    /* XXX: this dir read code is exactly the same as that in
     * ssl_engine_init.c, only the call to handle the fullname is different,
     * should fold the duplication.
     */
    apr_dir_t *dir;
    apr_finfo_t dirent;
    apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME;
    const char *fullname;
    BOOL ok = FALSE;

    if (apr_dir_open(&dir, pathname, ptemp) != APR_SUCCESS) {
        return FALSE;
    }

    while ((apr_dir_read(&dirent, finfo_flags, dir)) == APR_SUCCESS) {
        if (dirent.filetype == APR_DIR) {
            continue; /* don't try to load directories */
        }

        fullname = apr_pstrcat(ptemp,
                               pathname, "/", dirent.name,
                               NULL);

        if (SSL_X509_INFO_load_file(ptemp, sk, fullname)) {
            ok = TRUE;
        }
    }

    apr_dir_close(dir);

    return ok;
}

/*  _________________________________________________________________
**
**  Extra Server Certificate Chain Support
**  _________________________________________________________________
*/

/*
 * Read a file that optionally contains the server certificate in PEM
 * format, possibly followed by a sequence of CA certificates that
 * should be sent to the peer in the SSL Certificate message.
 */
int SSL_CTX_use_certificate_chain(
    SSL_CTX *ctx, char *file, int skipfirst, modssl_read_bio_cb_fn *cb)
{
    BIO *bio;
    X509 *x509;
    unsigned long err;
    int n;
    STACK *extra_certs;

    if ((bio = BIO_new(BIO_s_file_internal())) == NULL)
        return -1;
    if (BIO_read_filename(bio, file) <= 0) {
        BIO_free(bio);
        return -1;
    }
    /* optionally skip a leading server certificate */
    if (skipfirst) {
        if ((x509 = modssl_PEM_read_bio_X509(bio, NULL, cb, NULL)) == NULL) {
            BIO_free(bio);
            return -1;
        }
        X509_free(x509);
    }
    /* free a perhaps already configured extra chain */
    extra_certs=SSL_CTX_get_extra_certs(ctx);
    if (extra_certs != NULL) {
        sk_X509_pop_free((STACK_OF(X509) *)extra_certs, X509_free);
        SSL_CTX_set_extra_certs(ctx,NULL);
    }
    /* create new extra chain by loading the certs */
    n = 0;
    while ((x509 = modssl_PEM_read_bio_X509(bio, NULL, cb, NULL)) != NULL) {
        if (!SSL_CTX_add_extra_chain_cert(ctx, x509)) {
            X509_free(x509);
            BIO_free(bio);
            return -1;
        }
        n++;
    }
    /* Make sure that only the error is just an EOF */
    if ((err = ERR_peek_error()) > 0) {
        if (!(   ERR_GET_LIB(err) == ERR_LIB_PEM
              && ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
            BIO_free(bio);
            return -1;
        }
        while (ERR_get_error() > 0) ;
    }
    BIO_free(bio);
    return n;
}

/*  _________________________________________________________________
**
**  Session Stuff
**  _________________________________________________________________
*/

char *SSL_SESSION_id2sz(unsigned char *id, int idlen,
                        char *str, int strsize)
{
    char *cp;
    int n;

    cp = str;
    for (n = 0; n < idlen && n < SSL_MAX_SSL_SESSION_ID_LENGTH; n++) {
        apr_snprintf(cp, strsize - (cp-str), "%02X", id[n]);
        cp += 2;
    }
    *cp = NUL;
    return str;
}

/* sslc+OpenSSL compat */

int modssl_session_get_time(SSL_SESSION *session)
{
#ifdef OPENSSL_VERSION_NUMBER
    return SSL_SESSION_get_time(session);
#else /* assume sslc */
    CRYPTO_TIME_T ct;
    SSL_SESSION_get_time(session, &ct);
    return CRYPTO_time_to_int(&ct);
#endif
}

#ifndef SSLC_VERSION_NUMBER
#define SSLC_VERSION_NUMBER 0x0000
#endif

DH *modssl_dh_configure(unsigned char *p, int plen,
                        unsigned char *g, int glen)
{
    DH *dh;

    if (!(dh = DH_new())) {
        return NULL;
    }

#if defined(OPENSSL_VERSION_NUMBER) || (SSLC_VERSION_NUMBER < 0x2000)
    dh->p = BN_bin2bn(p, plen, NULL);
    dh->g = BN_bin2bn(g, glen, NULL);
    if (!(dh->p && dh->g)) {
        DH_free(dh);
        return NULL;
    }
#else
    R_EITEMS_add(dh->data, PK_TYPE_DH, PK_DH_P, 0, p, plen, R_EITEMS_PF_COPY);
    R_EITEMS_add(dh->data, PK_TYPE_DH, PK_DH_G, 0, g, glen, R_EITEMS_PF_COPY);
#endif

    return dh;
}