+++ /dev/null
-/*
- * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
-
-#include "e_os.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include "crypto/ctype.h"
-#include <string.h>
-#include <openssl/asn1.h>
-#include <openssl/ocsp.h>
-#include <openssl/err.h>
-#include <openssl/buffer.h>
-
-/* Stateful OCSP request code, supporting non-blocking I/O */
-
-/* Opaque OCSP request status structure */
-
-struct ocsp_req_ctx_st {
- int state; /* Current I/O state */
- unsigned char *iobuf; /* Line buffer */
- int iobuflen; /* Line buffer length */
- BIO *io; /* BIO to perform I/O with */
- BIO *mem; /* Memory BIO response is built into */
- unsigned long asn1_len; /* ASN1 length of response */
- unsigned long max_resp_len; /* Maximum length of response */
-};
-
-#define OCSP_MAX_RESP_LENGTH (100 * 1024)
-#define OCSP_MAX_LINE_LEN 4096;
-
-/* OCSP states */
-
-/* If set no reading should be performed */
-#define OHS_NOREAD 0x1000
-/* Error condition */
-#define OHS_ERROR (0 | OHS_NOREAD)
-/* First line being read */
-#define OHS_FIRSTLINE 1
-/* MIME headers being read */
-#define OHS_HEADERS 2
-/* OCSP initial header (tag + length) being read */
-#define OHS_ASN1_HEADER 3
-/* OCSP content octets being read */
-#define OHS_ASN1_CONTENT 4
-/* First call: ready to start I/O */
-#define OHS_ASN1_WRITE_INIT (5 | OHS_NOREAD)
-/* Request being sent */
-#define OHS_ASN1_WRITE (6 | OHS_NOREAD)
-/* Request being flushed */
-#define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
-/* Completed */
-#define OHS_DONE (8 | OHS_NOREAD)
-/* Headers set, no final \r\n included */
-#define OHS_HTTP_HEADER (9 | OHS_NOREAD)
-
-static int parse_http_line1(char *line);
-
-OCSP_REQ_CTX *OCSP_REQ_CTX_new(BIO *io, int maxline)
-{
- OCSP_REQ_CTX *rctx = OPENSSL_zalloc(sizeof(*rctx));
-
- if (rctx == NULL)
- return NULL;
- rctx->state = OHS_ERROR;
- rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
- rctx->mem = BIO_new(BIO_s_mem());
- rctx->io = io;
- if (maxline > 0)
- rctx->iobuflen = maxline;
- else
- rctx->iobuflen = OCSP_MAX_LINE_LEN;
- rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
- if (rctx->iobuf == NULL || rctx->mem == NULL) {
- OCSP_REQ_CTX_free(rctx);
- return NULL;
- }
- return rctx;
-}
-
-void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
-{
- if (!rctx)
- return;
- BIO_free(rctx->mem);
- OPENSSL_free(rctx->iobuf);
- OPENSSL_free(rctx);
-}
-
-BIO *OCSP_REQ_CTX_get0_mem_bio(OCSP_REQ_CTX *rctx)
-{
- return rctx->mem;
-}
-
-void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len)
-{
- if (len == 0)
- rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
- else
- rctx->max_resp_len = len;
-}
-
-int OCSP_REQ_CTX_i2d(OCSP_REQ_CTX *rctx, const ASN1_ITEM *it, ASN1_VALUE *val)
-{
- static const char req_hdr[] =
- "Content-Type: application/ocsp-request\r\n"
- "Content-Length: %d\r\n\r\n";
- int reqlen = ASN1_item_i2d(val, NULL, it);
- if (BIO_printf(rctx->mem, req_hdr, reqlen) <= 0)
- return 0;
- if (ASN1_item_i2d_bio(it, rctx->mem, val) <= 0)
- return 0;
- rctx->state = OHS_ASN1_WRITE_INIT;
- return 1;
-}
-
-int OCSP_REQ_CTX_nbio_d2i(OCSP_REQ_CTX *rctx,
- ASN1_VALUE **pval, const ASN1_ITEM *it)
-{
- int rv, len;
- const unsigned char *p;
-
- rv = OCSP_REQ_CTX_nbio(rctx);
- if (rv != 1)
- return rv;
-
- len = BIO_get_mem_data(rctx->mem, &p);
- *pval = ASN1_item_d2i(NULL, &p, len, it);
- if (*pval == NULL) {
- rctx->state = OHS_ERROR;
- return 0;
- }
- return 1;
-}
-
-int OCSP_REQ_CTX_http(OCSP_REQ_CTX *rctx, const char *op, const char *path)
-{
- static const char http_hdr[] = "%s %s HTTP/1.0\r\n";
-
- if (path == NULL)
- path = "/";
-
- if (BIO_printf(rctx->mem, http_hdr, op, path) <= 0)
- return 0;
- rctx->state = OHS_HTTP_HEADER;
- return 1;
-}
-
-int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
-{
- return OCSP_REQ_CTX_i2d(rctx, ASN1_ITEM_rptr(OCSP_REQUEST),
- (ASN1_VALUE *)req);
-}
-
-int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
- const char *name, const char *value)
-{
- if (!name)
- return 0;
- if (BIO_puts(rctx->mem, name) <= 0)
- return 0;
- if (value) {
- if (BIO_write(rctx->mem, ": ", 2) != 2)
- return 0;
- if (BIO_puts(rctx->mem, value) <= 0)
- return 0;
- }
- if (BIO_write(rctx->mem, "\r\n", 2) != 2)
- return 0;
- rctx->state = OHS_HTTP_HEADER;
- return 1;
-}
-
-OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, const char *path, OCSP_REQUEST *req,
- int maxline)
-{
-
- OCSP_REQ_CTX *rctx = NULL;
- rctx = OCSP_REQ_CTX_new(io, maxline);
- if (rctx == NULL)
- return NULL;
-
- if (!OCSP_REQ_CTX_http(rctx, "POST", path))
- goto err;
-
- if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
- goto err;
-
- return rctx;
-
- err:
- OCSP_REQ_CTX_free(rctx);
- return NULL;
-}
-
-/*
- * Parse the HTTP response. This will look like this: "HTTP/1.0 200 OK". We
- * need to obtain the numeric code and (optional) informational message.
- */
-
-static int parse_http_line1(char *line)
-{
- int retcode;
- char *p, *q, *r;
- /* Skip to first white space (passed protocol info) */
-
- for (p = line; *p && !ossl_isspace(*p); p++)
- continue;
- if (*p == '\0') {
- OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
- return 0;
- }
-
- /* Skip past white space to start of response code */
- while (*p && ossl_isspace(*p))
- p++;
-
- if (*p == '\0') {
- OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
- return 0;
- }
-
- /* Find end of response code: first whitespace after start of code */
- for (q = p; *q && !ossl_isspace(*q); q++)
- continue;
-
- if (*q == '\0') {
- OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
- return 0;
- }
-
- /* Set end of response code and start of message */
- *q++ = 0;
-
- /* Attempt to parse numeric code */
- retcode = strtoul(p, &r, 10);
-
- if (*r)
- return 0;
-
- /* Skip over any leading white space in message */
- while (*q && ossl_isspace(*q))
- q++;
-
- if (*q) {
- /*
- * Finally zap any trailing white space in message (include CRLF)
- */
-
- /* We know q has a non white space character so this is OK */
- for (r = q + strlen(q) - 1; ossl_isspace(*r); r--)
- *r = 0;
- }
- if (retcode != 200) {
- OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
- if (*q == '\0')
- ERR_add_error_data(2, "Code=", p);
- else
- ERR_add_error_data(4, "Code=", p, ",Reason=", q);
- return 0;
- }
-
- return 1;
-
-}
-
-int OCSP_REQ_CTX_nbio(OCSP_REQ_CTX *rctx)
-{
- int i, n;
- const unsigned char *p;
- next_io:
- if (!(rctx->state & OHS_NOREAD)) {
- n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
-
- if (n <= 0) {
- if (BIO_should_retry(rctx->io))
- return -1;
- return 0;
- }
-
- /* Write data to memory BIO */
-
- if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
- return 0;
- }
-
- switch (rctx->state) {
- case OHS_HTTP_HEADER:
- /* Last operation was adding headers: need a final \r\n */
- if (BIO_write(rctx->mem, "\r\n", 2) != 2) {
- rctx->state = OHS_ERROR;
- return 0;
- }
- rctx->state = OHS_ASN1_WRITE_INIT;
-
- /* fall thru */
- case OHS_ASN1_WRITE_INIT:
- rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
- rctx->state = OHS_ASN1_WRITE;
-
- /* fall thru */
- case OHS_ASN1_WRITE:
- n = BIO_get_mem_data(rctx->mem, &p);
-
- i = BIO_write(rctx->io, p + (n - rctx->asn1_len), rctx->asn1_len);
-
- if (i <= 0) {
- if (BIO_should_retry(rctx->io))
- return -1;
- rctx->state = OHS_ERROR;
- return 0;
- }
-
- rctx->asn1_len -= i;
-
- if (rctx->asn1_len > 0)
- goto next_io;
-
- rctx->state = OHS_ASN1_FLUSH;
-
- (void)BIO_reset(rctx->mem);
-
- /* fall thru */
- case OHS_ASN1_FLUSH:
-
- i = BIO_flush(rctx->io);
-
- if (i > 0) {
- rctx->state = OHS_FIRSTLINE;
- goto next_io;
- }
-
- if (BIO_should_retry(rctx->io))
- return -1;
-
- rctx->state = OHS_ERROR;
- return 0;
-
- case OHS_ERROR:
- return 0;
-
- case OHS_FIRSTLINE:
- case OHS_HEADERS:
-
- /* Attempt to read a line in */
-
- next_line:
- /*
- * Due to &%^*$" memory BIO behaviour with BIO_gets we have to check
- * there's a complete line in there before calling BIO_gets or we'll
- * just get a partial read.
- */
- n = BIO_get_mem_data(rctx->mem, &p);
- if ((n <= 0) || !memchr(p, '\n', n)) {
- if (n >= rctx->iobuflen) {
- rctx->state = OHS_ERROR;
- return 0;
- }
- goto next_io;
- }
- n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
-
- if (n <= 0) {
- if (BIO_should_retry(rctx->mem))
- goto next_io;
- rctx->state = OHS_ERROR;
- return 0;
- }
-
- /* Don't allow excessive lines */
- if (n == rctx->iobuflen) {
- rctx->state = OHS_ERROR;
- return 0;
- }
-
- /* First line */
- if (rctx->state == OHS_FIRSTLINE) {
- if (parse_http_line1((char *)rctx->iobuf)) {
- rctx->state = OHS_HEADERS;
- goto next_line;
- } else {
- rctx->state = OHS_ERROR;
- return 0;
- }
- } else {
- /* Look for blank line: end of headers */
- for (p = rctx->iobuf; *p; p++) {
- if ((*p != '\r') && (*p != '\n'))
- break;
- }
- if (*p)
- goto next_line;
-
- rctx->state = OHS_ASN1_HEADER;
-
- }
-
- /* Fall thru */
-
- case OHS_ASN1_HEADER:
- /*
- * Now reading ASN1 header: can read at least 2 bytes which is enough
- * for ASN1 SEQUENCE header and either length field or at least the
- * length of the length field.
- */
- n = BIO_get_mem_data(rctx->mem, &p);
- if (n < 2)
- goto next_io;
-
- /* Check it is an ASN1 SEQUENCE */
- if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
- rctx->state = OHS_ERROR;
- return 0;
- }
-
- /* Check out length field */
- if (*p & 0x80) {
- /*
- * If MSB set on initial length octet we can now always read 6
- * octets: make sure we have them.
- */
- if (n < 6)
- goto next_io;
- n = *p & 0x7F;
- /* Not NDEF or excessive length */
- if (!n || (n > 4)) {
- rctx->state = OHS_ERROR;
- return 0;
- }
- p++;
- rctx->asn1_len = 0;
- for (i = 0; i < n; i++) {
- rctx->asn1_len <<= 8;
- rctx->asn1_len |= *p++;
- }
-
- if (rctx->asn1_len > rctx->max_resp_len) {
- rctx->state = OHS_ERROR;
- return 0;
- }
-
- rctx->asn1_len += n + 2;
- } else
- rctx->asn1_len = *p + 2;
-
- rctx->state = OHS_ASN1_CONTENT;
-
- /* Fall thru */
-
- case OHS_ASN1_CONTENT:
- n = BIO_get_mem_data(rctx->mem, NULL);
- if (n < (int)rctx->asn1_len)
- goto next_io;
-
- rctx->state = OHS_DONE;
- return 1;
-
- case OHS_DONE:
- return 1;
-
- }
-
- return 0;
-
-}
-
-int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
-{
- return OCSP_REQ_CTX_nbio_d2i(rctx,
- (ASN1_VALUE **)presp,
- ASN1_ITEM_rptr(OCSP_RESPONSE));
-}
-
-/* Blocking OCSP request handler: now a special case of non-blocking I/O */
-
-OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, const char *path, OCSP_REQUEST *req)
-{
- OCSP_RESPONSE *resp = NULL;
- OCSP_REQ_CTX *ctx;
- int rv;
-
- ctx = OCSP_sendreq_new(b, path, req, -1);
-
- if (ctx == NULL)
- return NULL;
-
- do {
- rv = OCSP_sendreq_nbio(&resp, ctx);
- } while ((rv == -1) && BIO_should_retry(b));
-
- OCSP_REQ_CTX_free(ctx);
-
- if (rv)
- return resp;
-
- return NULL;
-}
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