From c1c6c0bf4560ffee3e2003f5d100625777b7a3da Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Mon, 17 Jul 2006 12:18:28 +0000 Subject: [PATCH] New non-blocking OCSP functionality. --- CHANGES | 3 + crypto/ocsp/ocsp.h | 6 + crypto/ocsp/ocsp_err.c | 1 + crypto/ocsp/ocsp_ht.c | 469 +++++++++++++++++++++++++++++++++-------- crypto/ossl_typ.h | 2 + 5 files changed, 396 insertions(+), 85 deletions(-) diff --git a/CHANGES b/CHANGES index bf519ba1f6..4f3d4af216 100644 --- a/CHANGES +++ b/CHANGES @@ -4,6 +4,9 @@ Changes between 0.9.8b and 0.9.9 [xx XXX xxxx] + *) Non-blocking OCSP request processing. + [Steve Henson] + *) Allow digests to supply their own micalg string for S/MIME type using the ctrl EVP_MD_CTRL_MICALG. [Steve Henson] diff --git a/crypto/ocsp/ocsp.h b/crypto/ocsp/ocsp.h index 53f3364af0..5ac4ac4203 100644 --- a/crypto/ocsp/ocsp.h +++ b/crypto/ocsp/ocsp.h @@ -64,6 +64,7 @@ #ifndef HEADER_OCSP_H #define HEADER_OCSP_H +#include #include #include #include @@ -397,6 +398,10 @@ typedef struct ocsp_service_locator_st (char *(*)())d2i_OCSP_CERTSTATUS,(char *)(cs)) OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req); +OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req, + int maxline); +int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx); +void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx); OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst, X509 *subject, X509 *issuer); @@ -574,6 +579,7 @@ void ERR_load_OCSP_strings(void); #define OCSP_F_OCSP_REQUEST_VERIFY 116 #define OCSP_F_OCSP_RESPONSE_GET1_BASIC 111 #define OCSP_F_OCSP_SENDREQ_BIO 112 +#define OCSP_F_OCSP_SENDREQ_NBIO 117 #define OCSP_F_REQUEST_VERIFY 113 /* Reason codes. */ diff --git a/crypto/ocsp/ocsp_err.c b/crypto/ocsp/ocsp_err.c index 2c8ed72884..9837a1d8f4 100644 --- a/crypto/ocsp/ocsp_err.c +++ b/crypto/ocsp/ocsp_err.c @@ -86,6 +86,7 @@ static ERR_STRING_DATA OCSP_str_functs[]= {ERR_FUNC(OCSP_F_OCSP_REQUEST_VERIFY), "OCSP_request_verify"}, {ERR_FUNC(OCSP_F_OCSP_RESPONSE_GET1_BASIC), "OCSP_response_get1_basic"}, {ERR_FUNC(OCSP_F_OCSP_SENDREQ_BIO), "OCSP_sendreq_bio"}, +{ERR_FUNC(OCSP_F_OCSP_SENDREQ_NBIO), "OCSP_sendreq_nbio"}, {ERR_FUNC(OCSP_F_REQUEST_VERIFY), "REQUEST_VERIFY"}, {0,NULL} }; diff --git a/crypto/ocsp/ocsp_ht.c b/crypto/ocsp/ocsp_ht.c index 9213e58ae4..41e3da8198 100644 --- a/crypto/ocsp/ocsp_ht.c +++ b/crypto/ocsp/ocsp_ht.c @@ -1,9 +1,9 @@ /* ocsp_ht.c */ /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL - * project 2000. + * project 2006. */ /* ==================================================================== - * Copyright (c) 2000 The OpenSSL Project. All rights reserved. + * 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 @@ -68,106 +68,405 @@ #define strtoul (unsigned long)strtol #endif /* OPENSSL_SYS_SUNOS */ -/* Quick and dirty HTTP OCSP request handler. - * Could make this a bit cleverer by adding - * support for non blocking BIOs and a few - * other refinements. - */ +/* Stateful OCSP request code, supporting non-blocking I/O */ -OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req) -{ - BIO *mem = NULL; - char tmpbuf[1024]; - OCSP_RESPONSE *resp = NULL; - char *p, *q, *r; - int len, retcode; - static char req_txt[] = -"POST %s HTTP/1.0\r\n\ -Content-Type: application/ocsp-request\r\n\ -Content-Length: %d\r\n\r\n"; - - len = i2d_OCSP_REQUEST(req, NULL); - if(BIO_printf(b, req_txt, path, len) < 0) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_WRITE_ERROR); - goto err; - } - if(i2d_OCSP_REQUEST_bio(b, req) <= 0) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_WRITE_ERROR); - goto err; +/* 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); } - if(!(mem = BIO_new(BIO_s_mem()))) goto err; - /* Copy response to a memory BIO: socket bios can't do gets! */ - while ((len = BIO_read(b, tmpbuf, sizeof tmpbuf))) { - if(len < 0) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_READ_ERROR); - goto err; + +OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req, + int maxline) + { + static 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; } - BIO_write(mem, tmpbuf, len); - } - if(BIO_gets(mem, tmpbuf, 512) <= 0) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR); - goto err; + 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. - */ +/* 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 = tmpbuf; *p && !isspace((unsigned char)*p); p++) continue; - if(!*p) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR); - goto err; - } + + for(p = line; *p && !isspace((unsigned char)*p); p++) + continue; + if(!*p) + { + OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO, + 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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR); - goto err; - } + while(*p && isspace((unsigned char)*p)) + p++; + + if(!*p) + { + OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO, + 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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR); - goto err; - } + for(q = p; *q && !isspace((unsigned char)*q); q++) + continue; + + if(!*q) + { + OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO, + 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) goto err; + + 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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_ERROR); - if(!*q) { - ERR_add_error_data(2, "Code=", p); + 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; } - else { + if(retcode != 200) + { + OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO, 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; } - goto err; + + + return 1; + } - /* Find blank line marking beginning of content */ - while(BIO_gets(mem, tmpbuf, 512) > 0) + +int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx) { - for(p = tmpbuf; *p && isspace((unsigned char)*p); p++) continue; - if(!*p) break; - } - if(*p) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_NO_CONTENT); - goto err; + 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; + + 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 < 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; + + } - if(!(resp = d2i_OCSP_RESPONSE_bio(mem, NULL))) { - OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,ERR_R_NESTED_ASN1_ERROR); - goto err; + +/* 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; } - err: - BIO_free(mem); - return resp; -} diff --git a/crypto/ossl_typ.h b/crypto/ossl_typ.h index 085953208e..7cc38ce734 100644 --- a/crypto/ossl_typ.h +++ b/crypto/ossl_typ.h @@ -181,4 +181,6 @@ typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad, typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d, int idx, long argl, void *argp); +typedef struct ocsp_req_ctx_st OCSP_REQ_CTX; + #endif /* def HEADER_OPENSSL_TYPES_H */ -- 2.25.1