/* v3_pci.c -*- mode:C; c-file-style: "eay" -*- */
/* Contributed to the OpenSSL Project 2004
 * by Richard Levitte (richard@levitte.org)
 */
/* Copyright (c) 2004 Kungliga Tekniska Högskolan
 * (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 <string.h>

#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.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)
			{
			OPENSSL_PUT_ERROR(X509V3, process_pci_value, X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
			X509V3_conf_err(val);
			return 0;
			}
		if (!(*language = OBJ_txt2obj(val->value, 0)))
			{
			OPENSSL_PUT_ERROR(X509V3, process_pci_value, X509V3_R_INVALID_OBJECT_IDENTIFIER);
			X509V3_conf_err(val);
			return 0;
			}
		}
	else if (strcmp(val->name, "pathlen") == 0)
		{
		if (*pathlen)
			{
			OPENSSL_PUT_ERROR(X509V3, process_pci_value, X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
			X509V3_conf_err(val);
			return 0;
			}
		if (!X509V3_get_value_int(val, pathlen))
			{
			OPENSSL_PUT_ERROR(X509V3, 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)
				{
				OPENSSL_PUT_ERROR(X509V3, 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) 
				{
				OPENSSL_PUT_ERROR(X509V3, 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;
				OPENSSL_PUT_ERROR(X509V3, 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)
				{
				OPENSSL_PUT_ERROR(X509V3, 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)
				{
				OPENSSL_PUT_ERROR(X509V3, 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;
				OPENSSL_PUT_ERROR(X509V3, process_pci_value, ERR_R_MALLOC_FAILURE);
				X509V3_conf_err(val);
				goto err;
				}
			}
		else
			{
			OPENSSL_PUT_ERROR(X509V3, process_pci_value, X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
			X509V3_conf_err(val);
			goto err;
			}
		if (!tmp_data)
			{
			OPENSSL_PUT_ERROR(X509V3, 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;
	size_t i, j;
	int nid;

	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))
			{
			OPENSSL_PUT_ERROR(X509V3, 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)
				{
				OPENSSL_PUT_ERROR(X509V3, 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)
		{
		OPENSSL_PUT_ERROR(X509V3, r2i_pci, X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
		goto err;
		}
	nid = OBJ_obj2nid(language);
	if ((nid == NID_Independent || nid == NID_id_ppl_inheritAll) && policy)
		{
		OPENSSL_PUT_ERROR(X509V3, r2i_pci, X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
		goto err;
		}

	pci = PROXY_CERT_INFO_EXTENSION_new();
	if (!pci)
		{
		OPENSSL_PUT_ERROR(X509V3, 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;
	}
