/* ocsp_ht.c */ /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL * project 2006. */ /* ==================================================================== * Copyright (c) 2006 The OpenSSL Project. 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. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED 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 OpenSSL PROJECT OR * ITS 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. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include #include #include #include #include #include #ifdef OPENSSL_SYS_SUNOS #define strtoul (unsigned long)strtol #endif /* OPENSSL_SYS_SUNOS */ /* 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 */ }; #define OCSP_MAX_REQUEST_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 /* 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) static int parse_http_line1(char *line); void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx) { if (rctx->mem) BIO_free(rctx->mem); if (rctx->iobuf) OPENSSL_free(rctx->iobuf); OPENSSL_free(rctx); } OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req, int maxline) { static const char post_hdr[] = "POST %s HTTP/1.0\r\n" "Content-Type: application/ocsp-request\r\n" "Content-Length: %d\r\n\r\n"; OCSP_REQ_CTX *rctx; rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX)); rctx->state = OHS_FIRSTLINE; 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 (!path) path = "/"; if (BIO_printf(rctx->mem, post_hdr, path, i2d_OCSP_REQUEST(req, NULL)) <= 0) { rctx->state = OHS_ERROR; return 0; } if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0) { rctx->state = OHS_ERROR; return 0; } rctx->state = OHS_ASN1_WRITE; rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL); return rctx; } /* 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 && !isspace((unsigned char)*p); p++) continue; if(!*p) { 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 && isspace((unsigned char)*p)) p++; if(!*p) { 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 && !isspace((unsigned char)*q); q++) continue; if(!*q) { 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 && isspace((unsigned char)*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; isspace((unsigned char)*r); r--) *r = 0; } if(retcode != 200) { OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR); if(!*q) ERR_add_error_data(2, "Code=", p); else ERR_add_error_data(4, "Code=", p, ",Reason=", q); return 0; } return 1; } int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, 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_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); 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 6 bytes which * is more than enough for any valid ASN1 SEQUENCE header */ n = BIO_get_mem_data(rctx->mem, &p); if (n < 6) 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) { 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 > OCSP_MAX_REQUEST_LENGTH) { 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, &p); if (n < (int)rctx->asn1_len) goto next_io; *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len); if (*presp) { rctx->state = OHS_DONE; return 1; } rctx->state = OHS_ERROR; return 0; break; case OHS_DONE: return 1; } return 0; } /* Blocking OCSP request handler: now a special case of non-blocking I/O */ OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req) { OCSP_RESPONSE *resp = NULL; OCSP_REQ_CTX *ctx; int rv; ctx = OCSP_sendreq_new(b, path, req, -1); 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; }