/* 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
#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;
-}
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