/src/openssl111/crypto/ocsp/ocsp_ht.c

Source (jump to first uncovered line)
/*
 * Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (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)
        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) {
        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) {
        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) {
        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)
            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;
}

Coverage Report

Created: 2023-09-25 06:41

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2001-2017 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		#include "e_os.h"
11		#include <stdio.h>
12		#include <stdlib.h>
13		#include "crypto/ctype.h"
14		#include <string.h>
15		#include <openssl/asn1.h>
16		#include <openssl/ocsp.h>
17		#include <openssl/err.h>
18		#include <openssl/buffer.h>
19
20		/* Stateful OCSP request code, supporting non-blocking I/O */
21
22		/* Opaque OCSP request status structure */
23
24		struct ocsp_req_ctx_st {
25		int state; /* Current I/O state */
26		unsigned char iobuf; / Line buffer */
27		int iobuflen; /* Line buffer length */
28		BIO io; / BIO to perform I/O with */
29		BIO mem; / Memory BIO response is built into */
30		unsigned long asn1_len; /* ASN1 length of response */
31		unsigned long max_resp_len; /* Maximum length of response */
32		};
33
34	0	#define OCSP_MAX_RESP_LENGTH (100 * 1024)
35	0	#define OCSP_MAX_LINE_LEN 4096;
36
37		/* OCSP states */
38
39		/* If set no reading should be performed */
40	0	#define OHS_NOREAD 0x1000
41		/* Error condition */
42	0	#define OHS_ERROR (0 \| OHS_NOREAD)
43		/* First line being read */
44	0	#define OHS_FIRSTLINE 1
45		/* MIME headers being read */
46	0	#define OHS_HEADERS 2
47		/* OCSP initial header (tag + length) being read */
48	0	#define OHS_ASN1_HEADER 3
49		/* OCSP content octets being read */
50	0	#define OHS_ASN1_CONTENT 4
51		/* First call: ready to start I/O */
52	0	#define OHS_ASN1_WRITE_INIT (5 \| OHS_NOREAD)
53		/* Request being sent */
54	0	#define OHS_ASN1_WRITE (6 \| OHS_NOREAD)
55		/* Request being flushed */
56	0	#define OHS_ASN1_FLUSH (7 \| OHS_NOREAD)
57		/* Completed */
58	0	#define OHS_DONE (8 \| OHS_NOREAD)
59		/* Headers set, no final \r\n included */
60	0	#define OHS_HTTP_HEADER (9 \| OHS_NOREAD)
61
62		static int parse_http_line1(char *line);
63
64		OCSP_REQ_CTX OCSP_REQ_CTX_new(BIO io, int maxline)
65	0	{
66	0	OCSP_REQ_CTX rctx = OPENSSL_zalloc(sizeof(rctx));
67
68	0	if (rctx == NULL)
69	0	return NULL;
70	0	rctx->state = OHS_ERROR;
71	0	rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
72	0	rctx->mem = BIO_new(BIO_s_mem());
73	0	rctx->io = io;
74	0	if (maxline > 0)
75	0	rctx->iobuflen = maxline;
76	0	else
77	0	rctx->iobuflen = OCSP_MAX_LINE_LEN;
78	0	rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
79	0	if (rctx->iobuf == NULL \|\| rctx->mem == NULL) {
80	0	OCSP_REQ_CTX_free(rctx);
81	0	return NULL;
82	0	}
83	0	return rctx;
84	0	}
85
86		void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
87	0	{
88	0	if (!rctx)
89	0	return;
90	0	BIO_free(rctx->mem);
91	0	OPENSSL_free(rctx->iobuf);
92	0	OPENSSL_free(rctx);
93	0	}
94
95		BIO OCSP_REQ_CTX_get0_mem_bio(OCSP_REQ_CTX rctx)
96	0	{
97	0	return rctx->mem;
98	0	}
99
100		void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len)
101	0	{
102	0	if (len == 0)
103	0	rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
104	0	else
105	0	rctx->max_resp_len = len;
106	0	}
107
108		int OCSP_REQ_CTX_i2d(OCSP_REQ_CTX rctx, const ASN1_ITEM it, ASN1_VALUE *val)
109	0	{
110	0	static const char req_hdr[] =
111	0	"Content-Type: application/ocsp-request\r\n"
112	0	"Content-Length: %d\r\n\r\n";
113	0	int reqlen = ASN1_item_i2d(val, NULL, it);
114	0	if (BIO_printf(rctx->mem, req_hdr, reqlen) <= 0)
115	0	return 0;
116	0	if (ASN1_item_i2d_bio(it, rctx->mem, val) <= 0)
117	0	return 0;
118	0	rctx->state = OHS_ASN1_WRITE_INIT;
119	0	return 1;
120	0	}
121
122		int OCSP_REQ_CTX_nbio_d2i(OCSP_REQ_CTX *rctx,
123		ASN1_VALUE *pval, const ASN1_ITEM it)
124	0	{
125	0	int rv, len;
126	0	const unsigned char *p;
127
128	0	rv = OCSP_REQ_CTX_nbio(rctx);
129	0	if (rv != 1)
130	0	return rv;
131
132	0	len = BIO_get_mem_data(rctx->mem, &p);
133	0	*pval = ASN1_item_d2i(NULL, &p, len, it);
134	0	if (*pval == NULL) {
135	0	rctx->state = OHS_ERROR;
136	0	return 0;
137	0	}
138	0	return 1;
139	0	}
140
141		int OCSP_REQ_CTX_http(OCSP_REQ_CTX rctx, const char op, const char *path)
142	0	{
143	0	static const char http_hdr[] = "%s %s HTTP/1.0\r\n";
144
145	0	if (!path)
146	0	path = "/";
147
148	0	if (BIO_printf(rctx->mem, http_hdr, op, path) <= 0)
149	0	return 0;
150	0	rctx->state = OHS_HTTP_HEADER;
151	0	return 1;
152	0	}
153
154		int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX rctx, OCSP_REQUEST req)
155	0	{
156	0	return OCSP_REQ_CTX_i2d(rctx, ASN1_ITEM_rptr(OCSP_REQUEST),
157	0	(ASN1_VALUE *)req);
158	0	}
159
160		int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
161		const char name, const char value)
162	0	{
163	0	if (!name)
164	0	return 0;
165	0	if (BIO_puts(rctx->mem, name) <= 0)
166	0	return 0;
167	0	if (value) {
168	0	if (BIO_write(rctx->mem, ": ", 2) != 2)
169	0	return 0;
170	0	if (BIO_puts(rctx->mem, value) <= 0)
171	0	return 0;
172	0	}
173	0	if (BIO_write(rctx->mem, "\r\n", 2) != 2)
174	0	return 0;
175	0	rctx->state = OHS_HTTP_HEADER;
176	0	return 1;
177	0	}
178
179		OCSP_REQ_CTX OCSP_sendreq_new(BIO io, const char path, OCSP_REQUEST req,
180		int maxline)
181	0	{
182
183	0	OCSP_REQ_CTX *rctx = NULL;
184	0	rctx = OCSP_REQ_CTX_new(io, maxline);
185	0	if (rctx == NULL)
186	0	return NULL;
187
188	0	if (!OCSP_REQ_CTX_http(rctx, "POST", path))
189	0	goto err;
190
191	0	if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
192	0	goto err;
193
194	0	return rctx;
195
196	0	err:
197	0	OCSP_REQ_CTX_free(rctx);
198	0	return NULL;
199	0	}
200
201		/*
202		* Parse the HTTP response. This will look like this: "HTTP/1.0 200 OK". We
203		* need to obtain the numeric code and (optional) informational message.
204		*/
205
206		static int parse_http_line1(char *line)
207	0	{
208	0	int retcode;
209	0	char p, q, *r;
210		/* Skip to first white space (passed protocol info) */
211
212	0	for (p = line; p && !ossl_isspace(p); p++)
213	0	continue;
214	0	if (!*p) {
215	0	OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
216	0	return 0;
217	0	}
218
219		/* Skip past white space to start of response code */
220	0	while (p && ossl_isspace(p))
221	0	p++;
222
223	0	if (!*p) {
224	0	OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
225	0	return 0;
226	0	}
227
228		/* Find end of response code: first whitespace after start of code */
229	0	for (q = p; q && !ossl_isspace(q); q++)
230	0	continue;
231
232	0	if (!*q) {
233	0	OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
234	0	return 0;
235	0	}
236
237		/* Set end of response code and start of message */
238	0	*q++ = 0;
239
240		/* Attempt to parse numeric code */
241	0	retcode = strtoul(p, &r, 10);
242
243	0	if (*r)
244	0	return 0;
245
246		/* Skip over any leading white space in message */
247	0	while (q && ossl_isspace(q))
248	0	q++;
249
250	0	if (*q) {
251		/*
252		* Finally zap any trailing white space in message (include CRLF)
253		*/
254
255		/* We know q has a non white space character so this is OK */
256	0	for (r = q + strlen(q) - 1; ossl_isspace(*r); r--)
257	0	*r = 0;
258	0	}
259	0	if (retcode != 200) {
260	0	OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
261	0	if (!*q)
262	0	ERR_add_error_data(2, "Code=", p);
263	0	else
264	0	ERR_add_error_data(4, "Code=", p, ",Reason=", q);
265	0	return 0;
266	0	}
267
268	0	return 1;
269
270	0	}
271
272		int OCSP_REQ_CTX_nbio(OCSP_REQ_CTX *rctx)
273	0	{
274	0	int i, n;
275	0	const unsigned char *p;
276	0	next_io:
277	0	if (!(rctx->state & OHS_NOREAD)) {
278	0	n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
279
280	0	if (n <= 0) {
281	0	if (BIO_should_retry(rctx->io))
282	0	return -1;
283	0	return 0;
284	0	}
285
286		/* Write data to memory BIO */
287
288	0	if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
289	0	return 0;
290	0	}
291
292	0	switch (rctx->state) {
293	0	case OHS_HTTP_HEADER:
294		/* Last operation was adding headers: need a final \r\n */
295	0	if (BIO_write(rctx->mem, "\r\n", 2) != 2) {
296	0	rctx->state = OHS_ERROR;
297	0	return 0;
298	0	}
299	0	rctx->state = OHS_ASN1_WRITE_INIT;
300
301		/* fall thru */
302	0	case OHS_ASN1_WRITE_INIT:
303	0	rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
304	0	rctx->state = OHS_ASN1_WRITE;
305
306		/* fall thru */
307	0	case OHS_ASN1_WRITE:
308	0	n = BIO_get_mem_data(rctx->mem, &p);
309
310	0	i = BIO_write(rctx->io, p + (n - rctx->asn1_len), rctx->asn1_len);
311
312	0	if (i <= 0) {
313	0	if (BIO_should_retry(rctx->io))
314	0	return -1;
315	0	rctx->state = OHS_ERROR;
316	0	return 0;
317	0	}
318
319	0	rctx->asn1_len -= i;
320
321	0	if (rctx->asn1_len > 0)
322	0	goto next_io;
323
324	0	rctx->state = OHS_ASN1_FLUSH;
325
326	0	(void)BIO_reset(rctx->mem);
327
328		/* fall thru */
329	0	case OHS_ASN1_FLUSH:
330
331	0	i = BIO_flush(rctx->io);
332
333	0	if (i > 0) {
334	0	rctx->state = OHS_FIRSTLINE;
335	0	goto next_io;
336	0	}
337
338	0	if (BIO_should_retry(rctx->io))
339	0	return -1;
340
341	0	rctx->state = OHS_ERROR;
342	0	return 0;
343
344	0	case OHS_ERROR:
345	0	return 0;
346
347	0	case OHS_FIRSTLINE:
348	0	case OHS_HEADERS:
349
350		/* Attempt to read a line in */
351
352	0	next_line:
353		/*
354		* Due to &%^*$" memory BIO behaviour with BIO_gets we have to check
355		* there's a complete line in there before calling BIO_gets or we'll
356		* just get a partial read.
357		*/
358	0	n = BIO_get_mem_data(rctx->mem, &p);
359	0	if ((n <= 0) \|\| !memchr(p, '\n', n)) {
360	0	if (n >= rctx->iobuflen) {
361	0	rctx->state = OHS_ERROR;
362	0	return 0;
363	0	}
364	0	goto next_io;
365	0	}
366	0	n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
367
368	0	if (n <= 0) {
369	0	if (BIO_should_retry(rctx->mem))
370	0	goto next_io;
371	0	rctx->state = OHS_ERROR;
372	0	return 0;
373	0	}
374
375		/* Don't allow excessive lines */
376	0	if (n == rctx->iobuflen) {
377	0	rctx->state = OHS_ERROR;
378	0	return 0;
379	0	}
380
381		/* First line */
382	0	if (rctx->state == OHS_FIRSTLINE) {
383	0	if (parse_http_line1((char *)rctx->iobuf)) {
384	0	rctx->state = OHS_HEADERS;
385	0	goto next_line;
386	0	} else {
387	0	rctx->state = OHS_ERROR;
388	0	return 0;
389	0	}
390	0	} else {
391		/* Look for blank line: end of headers */
392	0	for (p = rctx->iobuf; *p; p++) {
393	0	if ((p != '\r') && (p != '\n'))
394	0	break;
395	0	}
396	0	if (*p)
397	0	goto next_line;
398
399	0	rctx->state = OHS_ASN1_HEADER;
400
401	0	}
402
403		/* Fall thru */
404
405	0	case OHS_ASN1_HEADER:
406		/*
407		* Now reading ASN1 header: can read at least 2 bytes which is enough
408		* for ASN1 SEQUENCE header and either length field or at least the
409		* length of the length field.
410		*/
411	0	n = BIO_get_mem_data(rctx->mem, &p);
412	0	if (n < 2)
413	0	goto next_io;
414
415		/* Check it is an ASN1 SEQUENCE */
416	0	if (*p++ != (V_ASN1_SEQUENCE \| V_ASN1_CONSTRUCTED)) {
417	0	rctx->state = OHS_ERROR;
418	0	return 0;
419	0	}
420
421		/* Check out length field */
422	0	if (*p & 0x80) {
423		/*
424		* If MSB set on initial length octet we can now always read 6
425		* octets: make sure we have them.
426		*/
427	0	if (n < 6)
428	0	goto next_io;
429	0	n = *p & 0x7F;
430		/* Not NDEF or excessive length */
431	0	if (!n \|\| (n > 4)) {
432	0	rctx->state = OHS_ERROR;
433	0	return 0;
434	0	}
435	0	p++;
436	0	rctx->asn1_len = 0;
437	0	for (i = 0; i < n; i++) {
438	0	rctx->asn1_len <<= 8;
439	0	rctx->asn1_len \|= *p++;
440	0	}
441
442	0	if (rctx->asn1_len > rctx->max_resp_len) {
443	0	rctx->state = OHS_ERROR;
444	0	return 0;
445	0	}
446
447	0	rctx->asn1_len += n + 2;
448	0	} else
449	0	rctx->asn1_len = *p + 2;
450
451	0	rctx->state = OHS_ASN1_CONTENT;
452
453		/* Fall thru */
454
455	0	case OHS_ASN1_CONTENT:
456	0	n = BIO_get_mem_data(rctx->mem, NULL);
457	0	if (n < (int)rctx->asn1_len)
458	0	goto next_io;
459
460	0	rctx->state = OHS_DONE;
461	0	return 1;
462
463	0	case OHS_DONE:
464	0	return 1;
465
466	0	}
467
468	0	return 0;
469
470	0	}
471
472		int OCSP_sendreq_nbio(OCSP_RESPONSE *presp, OCSP_REQ_CTX rctx)
473	0	{
474	0	return OCSP_REQ_CTX_nbio_d2i(rctx,
475	0	(ASN1_VALUE **)presp,
476	0	ASN1_ITEM_rptr(OCSP_RESPONSE));
477	0	}
478
479		/* Blocking OCSP request handler: now a special case of non-blocking I/O */
480
481		OCSP_RESPONSE OCSP_sendreq_bio(BIO b, const char path, OCSP_REQUEST req)
482	0	{
483	0	OCSP_RESPONSE *resp = NULL;
484	0	OCSP_REQ_CTX *ctx;
485	0	int rv;
486
487	0	ctx = OCSP_sendreq_new(b, path, req, -1);
488
489	0	if (ctx == NULL)
490	0	return NULL;
491
492	0	do {
493	0	rv = OCSP_sendreq_nbio(&resp, ctx);
494	0	} while ((rv == -1) && BIO_should_retry(b));
495
496	0	OCSP_REQ_CTX_free(ctx);
497
498	0	if (rv)
499	0	return resp;
500
501	0	return NULL;
502	0	}