503 lines
13 KiB
C
503 lines
13 KiB
C
/*
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* Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "e_os.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "crypto/ctype.h"
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/ocsp.h>
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#include <openssl/err.h>
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#include <openssl/buffer.h>
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/* Stateful OCSP request code, supporting non-blocking I/O */
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/* Opaque OCSP request status structure */
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struct ocsp_req_ctx_st {
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int state; /* Current I/O state */
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unsigned char *iobuf; /* Line buffer */
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int iobuflen; /* Line buffer length */
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BIO *io; /* BIO to perform I/O with */
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BIO *mem; /* Memory BIO response is built into */
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unsigned long asn1_len; /* ASN1 length of response */
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unsigned long max_resp_len; /* Maximum length of response */
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};
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#define OCSP_MAX_RESP_LENGTH (100 * 1024)
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#define OCSP_MAX_LINE_LEN 4096;
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/* OCSP states */
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/* If set no reading should be performed */
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#define OHS_NOREAD 0x1000
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/* Error condition */
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#define OHS_ERROR (0 | OHS_NOREAD)
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/* First line being read */
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#define OHS_FIRSTLINE 1
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/* MIME headers being read */
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#define OHS_HEADERS 2
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/* OCSP initial header (tag + length) being read */
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#define OHS_ASN1_HEADER 3
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/* OCSP content octets being read */
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#define OHS_ASN1_CONTENT 4
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/* First call: ready to start I/O */
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#define OHS_ASN1_WRITE_INIT (5 | OHS_NOREAD)
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/* Request being sent */
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#define OHS_ASN1_WRITE (6 | OHS_NOREAD)
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/* Request being flushed */
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#define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
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/* Completed */
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#define OHS_DONE (8 | OHS_NOREAD)
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/* Headers set, no final \r\n included */
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#define OHS_HTTP_HEADER (9 | OHS_NOREAD)
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static int parse_http_line1(char *line);
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OCSP_REQ_CTX *OCSP_REQ_CTX_new(BIO *io, int maxline)
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{
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OCSP_REQ_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
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if (rctx == NULL)
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return NULL;
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rctx->state = OHS_ERROR;
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rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
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rctx->mem = BIO_new(BIO_s_mem());
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rctx->io = io;
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if (maxline > 0)
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rctx->iobuflen = maxline;
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else
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rctx->iobuflen = OCSP_MAX_LINE_LEN;
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rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
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if (rctx->iobuf == NULL || rctx->mem == NULL) {
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OCSP_REQ_CTX_free(rctx);
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return NULL;
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}
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return rctx;
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}
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void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
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{
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if (!rctx)
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return;
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BIO_free(rctx->mem);
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OPENSSL_free(rctx->iobuf);
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OPENSSL_free(rctx);
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}
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BIO *OCSP_REQ_CTX_get0_mem_bio(OCSP_REQ_CTX *rctx)
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{
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return rctx->mem;
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}
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void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len)
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{
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if (len == 0)
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rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
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else
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rctx->max_resp_len = len;
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}
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int OCSP_REQ_CTX_i2d(OCSP_REQ_CTX *rctx, const ASN1_ITEM *it, ASN1_VALUE *val)
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{
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static const char req_hdr[] =
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"Content-Type: application/ocsp-request\r\n"
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"Content-Length: %d\r\n\r\n";
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int reqlen = ASN1_item_i2d(val, NULL, it);
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if (BIO_printf(rctx->mem, req_hdr, reqlen) <= 0)
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return 0;
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if (ASN1_item_i2d_bio(it, rctx->mem, val) <= 0)
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return 0;
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rctx->state = OHS_ASN1_WRITE_INIT;
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return 1;
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}
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int OCSP_REQ_CTX_nbio_d2i(OCSP_REQ_CTX *rctx,
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ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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int rv, len;
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const unsigned char *p;
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rv = OCSP_REQ_CTX_nbio(rctx);
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if (rv != 1)
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return rv;
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len = BIO_get_mem_data(rctx->mem, &p);
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*pval = ASN1_item_d2i(NULL, &p, len, it);
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if (*pval == NULL) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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return 1;
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}
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int OCSP_REQ_CTX_http(OCSP_REQ_CTX *rctx, const char *op, const char *path)
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{
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static const char http_hdr[] = "%s %s HTTP/1.0\r\n";
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if (!path)
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path = "/";
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if (BIO_printf(rctx->mem, http_hdr, op, path) <= 0)
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return 0;
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rctx->state = OHS_HTTP_HEADER;
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return 1;
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}
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int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
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{
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return OCSP_REQ_CTX_i2d(rctx, ASN1_ITEM_rptr(OCSP_REQUEST),
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(ASN1_VALUE *)req);
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}
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int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
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const char *name, const char *value)
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{
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if (!name)
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return 0;
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if (BIO_puts(rctx->mem, name) <= 0)
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return 0;
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if (value) {
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if (BIO_write(rctx->mem, ": ", 2) != 2)
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return 0;
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if (BIO_puts(rctx->mem, value) <= 0)
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return 0;
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}
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if (BIO_write(rctx->mem, "\r\n", 2) != 2)
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return 0;
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rctx->state = OHS_HTTP_HEADER;
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return 1;
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}
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OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, const char *path, OCSP_REQUEST *req,
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int maxline)
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{
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OCSP_REQ_CTX *rctx = NULL;
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rctx = OCSP_REQ_CTX_new(io, maxline);
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if (rctx == NULL)
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return NULL;
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if (!OCSP_REQ_CTX_http(rctx, "POST", path))
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goto err;
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if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
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goto err;
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return rctx;
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err:
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OCSP_REQ_CTX_free(rctx);
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return NULL;
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}
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/*
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* Parse the HTTP response. This will look like this: "HTTP/1.0 200 OK". We
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* need to obtain the numeric code and (optional) informational message.
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*/
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static int parse_http_line1(char *line)
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{
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int retcode;
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char *p, *q, *r;
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/* Skip to first white space (passed protocol info) */
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for (p = line; *p && !ossl_isspace(*p); p++)
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continue;
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if (!*p) {
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Skip past white space to start of response code */
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while (*p && ossl_isspace(*p))
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p++;
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if (!*p) {
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Find end of response code: first whitespace after start of code */
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for (q = p; *q && !ossl_isspace(*q); q++)
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continue;
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if (!*q) {
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Set end of response code and start of message */
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*q++ = 0;
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/* Attempt to parse numeric code */
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retcode = strtoul(p, &r, 10);
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if (*r)
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return 0;
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/* Skip over any leading white space in message */
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while (*q && ossl_isspace(*q))
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q++;
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if (*q) {
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/*
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* Finally zap any trailing white space in message (include CRLF)
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*/
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/* We know q has a non white space character so this is OK */
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for (r = q + strlen(q) - 1; ossl_isspace(*r); r--)
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*r = 0;
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}
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if (retcode != 200) {
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
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if (!*q)
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ERR_add_error_data(2, "Code=", p);
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else
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ERR_add_error_data(4, "Code=", p, ",Reason=", q);
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return 0;
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}
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return 1;
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}
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int OCSP_REQ_CTX_nbio(OCSP_REQ_CTX *rctx)
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{
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int i, n;
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const unsigned char *p;
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next_io:
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if (!(rctx->state & OHS_NOREAD)) {
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n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
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if (n <= 0) {
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if (BIO_should_retry(rctx->io))
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return -1;
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return 0;
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}
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/* Write data to memory BIO */
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if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
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return 0;
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}
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switch (rctx->state) {
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case OHS_HTTP_HEADER:
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/* Last operation was adding headers: need a final \r\n */
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if (BIO_write(rctx->mem, "\r\n", 2) != 2) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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rctx->state = OHS_ASN1_WRITE_INIT;
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/* fall thru */
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case OHS_ASN1_WRITE_INIT:
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rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
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rctx->state = OHS_ASN1_WRITE;
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/* fall thru */
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case OHS_ASN1_WRITE:
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n = BIO_get_mem_data(rctx->mem, &p);
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i = BIO_write(rctx->io, p + (n - rctx->asn1_len), rctx->asn1_len);
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if (i <= 0) {
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if (BIO_should_retry(rctx->io))
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return -1;
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rctx->state = OHS_ERROR;
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return 0;
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}
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rctx->asn1_len -= i;
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if (rctx->asn1_len > 0)
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goto next_io;
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rctx->state = OHS_ASN1_FLUSH;
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(void)BIO_reset(rctx->mem);
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/* fall thru */
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case OHS_ASN1_FLUSH:
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i = BIO_flush(rctx->io);
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if (i > 0) {
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rctx->state = OHS_FIRSTLINE;
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goto next_io;
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}
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if (BIO_should_retry(rctx->io))
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return -1;
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rctx->state = OHS_ERROR;
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return 0;
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case OHS_ERROR:
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return 0;
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case OHS_FIRSTLINE:
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case OHS_HEADERS:
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/* Attempt to read a line in */
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next_line:
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/*
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* Due to &%^*$" memory BIO behaviour with BIO_gets we have to check
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* there's a complete line in there before calling BIO_gets or we'll
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* just get a partial read.
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*/
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n = BIO_get_mem_data(rctx->mem, &p);
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if ((n <= 0) || !memchr(p, '\n', n)) {
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if (n >= rctx->iobuflen) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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goto next_io;
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}
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n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
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if (n <= 0) {
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if (BIO_should_retry(rctx->mem))
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goto next_io;
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* Don't allow excessive lines */
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if (n == rctx->iobuflen) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* First line */
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if (rctx->state == OHS_FIRSTLINE) {
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if (parse_http_line1((char *)rctx->iobuf)) {
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rctx->state = OHS_HEADERS;
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goto next_line;
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} else {
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rctx->state = OHS_ERROR;
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return 0;
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}
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} else {
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/* Look for blank line: end of headers */
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for (p = rctx->iobuf; *p; p++) {
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if ((*p != '\r') && (*p != '\n'))
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break;
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}
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if (*p)
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goto next_line;
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rctx->state = OHS_ASN1_HEADER;
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}
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/* Fall thru */
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case OHS_ASN1_HEADER:
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/*
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* Now reading ASN1 header: can read at least 2 bytes which is enough
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* for ASN1 SEQUENCE header and either length field or at least the
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* length of the length field.
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*/
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n = BIO_get_mem_data(rctx->mem, &p);
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if (n < 2)
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goto next_io;
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/* Check it is an ASN1 SEQUENCE */
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if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* Check out length field */
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if (*p & 0x80) {
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/*
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* If MSB set on initial length octet we can now always read 6
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* octets: make sure we have them.
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*/
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if (n < 6)
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goto next_io;
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n = *p & 0x7F;
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/* Not NDEF or excessive length */
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if (!n || (n > 4)) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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p++;
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rctx->asn1_len = 0;
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for (i = 0; i < n; i++) {
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rctx->asn1_len <<= 8;
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rctx->asn1_len |= *p++;
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}
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if (rctx->asn1_len > rctx->max_resp_len) {
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rctx->state = OHS_ERROR;
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return 0;
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}
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rctx->asn1_len += n + 2;
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} else
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rctx->asn1_len = *p + 2;
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rctx->state = OHS_ASN1_CONTENT;
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/* Fall thru */
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case OHS_ASN1_CONTENT:
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n = BIO_get_mem_data(rctx->mem, NULL);
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if (n < (int)rctx->asn1_len)
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goto next_io;
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rctx->state = OHS_DONE;
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return 1;
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case OHS_DONE:
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return 1;
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}
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return 0;
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}
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int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
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{
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return OCSP_REQ_CTX_nbio_d2i(rctx,
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(ASN1_VALUE **)presp,
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ASN1_ITEM_rptr(OCSP_RESPONSE));
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}
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/* Blocking OCSP request handler: now a special case of non-blocking I/O */
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OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, const char *path, OCSP_REQUEST *req)
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{
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OCSP_RESPONSE *resp = NULL;
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OCSP_REQ_CTX *ctx;
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int rv;
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ctx = OCSP_sendreq_new(b, path, req, -1);
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if (ctx == NULL)
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return NULL;
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do {
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rv = OCSP_sendreq_nbio(&resp, ctx);
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} while ((rv == -1) && BIO_should_retry(b));
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OCSP_REQ_CTX_free(ctx);
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if (rv)
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return resp;
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return NULL;
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}
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