v3_pci.c

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/* v3_pci.c -*- mode:C; c-file-style: "eay" -*- */
/* Contributed to the OpenSSL Project 2004
 * by Richard Levitte ([email protected])
 */
/* Copyright (c) 2004 Kungliga Tekniska H�gskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/x509v3.h>

static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
    BIO *out, int indent);
static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
    X509V3_CTX *ctx, char *str);

const X509V3_EXT_METHOD v3_pci =
    { NID_proxyCertInfo, 0, ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),
      0,0,0,0,
      0,0,
      NULL, NULL,
      (X509V3_EXT_I2R)i2r_pci,
      (X509V3_EXT_R2I)r2i_pci,
      NULL,
    };

static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci,
    BIO *out, int indent)
    {
    BIO_printf(out, "%*sPath Length Constraint: ", indent, "");
    if (pci->pcPathLengthConstraint)
      i2a_ASN1_INTEGER(out, pci->pcPathLengthConstraint);
    else
      BIO_printf(out, "infinite");
    BIO_puts(out, "\n");
    BIO_printf(out, "%*sPolicy Language: ", indent, "");
    i2a_ASN1_OBJECT(out, pci->proxyPolicy->policyLanguage);
    BIO_puts(out, "\n");
    if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
      BIO_printf(out, "%*sPolicy Text: %s\n", indent, "",
             pci->proxyPolicy->policy->data);
    return 1;
    }

static int process_pci_value(CONF_VALUE *val,
    ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
    ASN1_OCTET_STRING **policy)
    {
    int free_policy = 0;

    if (strcmp(val->name, "language") == 0)
        {
        if (*language)
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
            X509V3_conf_err(val);
            return 0;
            }
        if (!(*language = OBJ_txt2obj(val->value, 0)))
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_INVALID_OBJECT_IDENTIFIER);
            X509V3_conf_err(val);
            return 0;
            }
        }
    else if (strcmp(val->name, "pathlen") == 0)
        {
        if (*pathlen)
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
            X509V3_conf_err(val);
            return 0;
            }
        if (!X509V3_get_value_int(val, pathlen))
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_PATH_LENGTH);
            X509V3_conf_err(val);
            return 0;
            }
        }
    else if (strcmp(val->name, "policy") == 0)
        {
        unsigned char *tmp_data = NULL;
        long val_len;
        if (!*policy)
            {
            *policy = ASN1_OCTET_STRING_new();
            if (!*policy)
                {
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                X509V3_conf_err(val);
                return 0;
                }
            free_policy = 1;
            }
        if (strncmp(val->value, "hex:", 4) == 0)
            {
            unsigned char *tmp_data2 =
                string_to_hex(val->value + 4, &val_len);

            if (!tmp_data2) 
                {
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_ILLEGAL_HEX_DIGIT);
                X509V3_conf_err(val);
                goto err;
                }

            tmp_data = OPENSSL_realloc((*policy)->data,
                (*policy)->length + val_len + 1);
            if (tmp_data)
                {
                (*policy)->data = tmp_data;
                memcpy(&(*policy)->data[(*policy)->length],
                    tmp_data2, val_len);
                (*policy)->length += val_len;
                (*policy)->data[(*policy)->length] = '\0';
                }
            else
                {
                OPENSSL_free(tmp_data2);
                /* realloc failure implies the original data space is b0rked too! */
                (*policy)->data = NULL;
                (*policy)->length = 0;
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                X509V3_conf_err(val);
                goto err;
                }
            OPENSSL_free(tmp_data2);
            }
        else if (strncmp(val->value, "file:", 5) == 0)
            {
            unsigned char buf[2048];
            int n;
            BIO *b = BIO_new_file(val->value + 5, "r");
            if (!b)
                {
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_BIO_LIB);
                X509V3_conf_err(val);
                goto err;
                }
            while((n = BIO_read(b, buf, sizeof(buf))) > 0
                || (n == 0 && BIO_should_retry(b)))
                {
                if (!n) continue;

                tmp_data = OPENSSL_realloc((*policy)->data,
                    (*policy)->length + n + 1);

                if (!tmp_data)
                    break;

                (*policy)->data = tmp_data;
                memcpy(&(*policy)->data[(*policy)->length],
                    buf, n);
                (*policy)->length += n;
                (*policy)->data[(*policy)->length] = '\0';
                }
            BIO_free_all(b);

            if (n < 0)
                {
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_BIO_LIB);
                X509V3_conf_err(val);
                goto err;
                }
            }
        else if (strncmp(val->value, "text:", 5) == 0)
            {
            val_len = strlen(val->value + 5);
            tmp_data = OPENSSL_realloc((*policy)->data,
                (*policy)->length + val_len + 1);
            if (tmp_data)
                {
                (*policy)->data = tmp_data;
                memcpy(&(*policy)->data[(*policy)->length],
                    val->value + 5, val_len);
                (*policy)->length += val_len;
                (*policy)->data[(*policy)->length] = '\0';
                }
            else
                {
                /* realloc failure implies the original data space is b0rked too! */
                (*policy)->data = NULL;
                (*policy)->length = 0;
                X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                X509V3_conf_err(val);
                goto err;
                }
            }
        else
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
            X509V3_conf_err(val);
            goto err;
            }
        if (!tmp_data)
            {
            X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
            X509V3_conf_err(val);
            goto err;
            }
        }
    return 1;
err:
    if (free_policy)
        {
        ASN1_OCTET_STRING_free(*policy);
        *policy = NULL;
        }
    return 0;
    }

static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
    X509V3_CTX *ctx, char *value)
    {
    PROXY_CERT_INFO_EXTENSION *pci = NULL;
    STACK_OF(CONF_VALUE) *vals;
    ASN1_OBJECT *language = NULL;
    ASN1_INTEGER *pathlen = NULL;
    ASN1_OCTET_STRING *policy = NULL;
    int i, j;

    vals = X509V3_parse_list(value);
    for (i = 0; i < sk_CONF_VALUE_num(vals); i++)
        {
        CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
        if (!cnf->name || (*cnf->name != '@' && !cnf->value))
            {
            X509V3err(X509V3_F_R2I_PCI,X509V3_R_INVALID_PROXY_POLICY_SETTING);
            X509V3_conf_err(cnf);
            goto err;
            }
        if (*cnf->name == '@')
            {
            STACK_OF(CONF_VALUE) *sect;
            int success_p = 1;

            sect = X509V3_get_section(ctx, cnf->name + 1);
            if (!sect)
                {
                X509V3err(X509V3_F_R2I_PCI,X509V3_R_INVALID_SECTION);
                X509V3_conf_err(cnf);
                goto err;
                }
            for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++)
                {
                success_p =
                    process_pci_value(sk_CONF_VALUE_value(sect, j),
                        &language, &pathlen, &policy);
                }
            X509V3_section_free(ctx, sect);
            if (!success_p)
                goto err;
            }
        else
            {
            if (!process_pci_value(cnf,
                    &language, &pathlen, &policy))
                {
                X509V3_conf_err(cnf);
                goto err;
                }
            }
        }

    /* Language is mandatory */
    if (!language)
        {
        X509V3err(X509V3_F_R2I_PCI,X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
        goto err;
        }
    i = OBJ_obj2nid(language);
    if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy)
        {
        X509V3err(X509V3_F_R2I_PCI,X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
        goto err;
        }

    pci = PROXY_CERT_INFO_EXTENSION_new();
    if (!pci)
        {
        X509V3err(X509V3_F_R2I_PCI,ERR_R_MALLOC_FAILURE);
        goto err;
        }

    pci->proxyPolicy->policyLanguage = language; language = NULL;
    pci->proxyPolicy->policy = policy; policy = NULL;
    pci->pcPathLengthConstraint = pathlen; pathlen = NULL;
    goto end;
err:
    if (language) { ASN1_OBJECT_free(language); language = NULL; }
    if (pathlen) { ASN1_INTEGER_free(pathlen); pathlen = NULL; }
    if (policy) { ASN1_OCTET_STRING_free(policy); policy = NULL; }
    if (pci) { PROXY_CERT_INFO_EXTENSION_free(pci); pci = NULL; }
end:
    sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
    return pci;
    }