1SSL_CTX_SET_TLSEXT_STATUS_CB(3)     OpenSSL    SSL_CTX_SET_TLSEXT_STATUS_CB(3)
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NAME

6       SSL_CTX_set_tlsext_status_cb, SSL_CTX_get_tlsext_status_cb,
7       SSL_CTX_set_tlsext_status_arg, SSL_CTX_get_tlsext_status_arg,
8       SSL_CTX_set_tlsext_status_type, SSL_CTX_get_tlsext_status_type,
9       SSL_set_tlsext_status_type, SSL_get_tlsext_status_type,
10       SSL_get_tlsext_status_ocsp_resp, SSL_set_tlsext_status_ocsp_resp - OCSP
11       Certificate Status Request functions
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SYNOPSIS

14        #include <openssl/tls1.h>
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16        long SSL_CTX_set_tlsext_status_cb(SSL_CTX *ctx, int (*callback)(SSL *, void *));
17        long SSL_CTX_get_tlsext_status_cb(SSL_CTX *ctx, int (**callback)(SSL *, void *));
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19        long SSL_CTX_set_tlsext_status_arg(SSL_CTX *ctx, void *arg);
20        long SSL_CTX_get_tlsext_status_arg(SSL_CTX *ctx, void **arg);
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22        long SSL_CTX_set_tlsext_status_type(SSL_CTX *ctx, int type);
23        long SSL_CTX_get_tlsext_status_type(SSL_CTX *ctx);
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25        long SSL_set_tlsext_status_type(SSL *s, int type);
26        long SSL_get_tlsext_status_type(SSL *s);
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28        long SSL_get_tlsext_status_ocsp_resp(ssl, unsigned char **resp);
29        long SSL_set_tlsext_status_ocsp_resp(ssl, unsigned char *resp, int len);
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DESCRIPTION

32       A client application may request that a server send back an OCSP status
33       response (also known as OCSP stapling). To do so the client should call
34       the SSL_CTX_set_tlsext_status_type() function prior to the creation of
35       any SSL objects. Alternatively an application can call the
36       SSL_set_tlsext_status_type() function on an individual SSL object prior
37       to the start of the handshake.  Currently the only supported type is
38       TLSEXT_STATUSTYPE_ocsp. This value should be passed in the type
39       argument. Calling SSL_CTX_get_tlsext_status_type() will return the type
40       TLSEXT_STATUSTYPE_ocsp previously set via
41       SSL_CTX_set_tlsext_status_type() or -1 if not set.
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43       The client should additionally provide a callback function to decide
44       what to do with the returned OCSP response by calling
45       SSL_CTX_set_tlsext_status_cb(). The callback function should determine
46       whether the returned OCSP response is acceptable or not. The callback
47       will be passed as an argument the value previously set via a call to
48       SSL_CTX_set_tlsext_status_arg(). Note that the callback will not be
49       called in the event of a handshake where session resumption occurs
50       (because there are no Certificates exchanged in such a handshake).  The
51       callback previously set via SSL_CTX_set_tlsext_status_cb() can be
52       retrieved by calling SSL_CTX_get_tlsext_status_cb(), and the argument
53       by calling SSL_CTX_get_tlsext_status_arg().
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55       On the client side SSL_get_tlsext_status_type() can be used to
56       determine whether the client has previously called
57       SSL_set_tlsext_status_type(). It will return TLSEXT_STATUSTYPE_ocsp if
58       it has been called or -1 otherwise. On the server side
59       SSL_get_tlsext_status_type() can be used to determine whether the
60       client requested OCSP stapling. If the client requested it then this
61       function will return TLSEXT_STATUSTYPE_ocsp, or -1 otherwise.
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63       The response returned by the server can be obtained via a call to
64       SSL_get_tlsext_status_ocsp_resp(). The value *resp will be updated to
65       point to the OCSP response data and the return value will be the length
66       of that data.  Typically a callback would obtain an OCSP_RESPONSE
67       object from this data via a call to the d2i_OCSP_RESPONSE() function.
68       If the server has not provided any response data then *resp will be
69       NULL and the return value from SSL_get_tlsext_status_ocsp_resp() will
70       be -1.
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72       A server application must also call the SSL_CTX_set_tlsext_status_cb()
73       function if it wants to be able to provide clients with OCSP
74       Certificate Status responses. Typically the server callback would
75       obtain the server certificate that is being sent back to the client via
76       a call to SSL_get_certificate(); obtain the OCSP response to be sent
77       back; and then set that response data by calling
78       SSL_set_tlsext_status_ocsp_resp(). A pointer to the response data
79       should be provided in the resp argument, and the length of that data
80       should be in the len argument.
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RETURN VALUES

83       The callback when used on the client side should return a negative
84       value on error; 0 if the response is not acceptable (in which case the
85       handshake will fail) or a positive value if it is acceptable.
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87       The callback when used on the server side should return with either
88       SSL_TLSEXT_ERR_OK (meaning that the OCSP response that has been set
89       should be returned), SSL_TLSEXT_ERR_NOACK (meaning that an OCSP
90       response should not be returned) or SSL_TLSEXT_ERR_ALERT_FATAL (meaning
91       that a fatal error has occurred).
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93       SSL_CTX_set_tlsext_status_cb(), SSL_CTX_set_tlsext_status_arg(),
94       SSL_CTX_set_tlsext_status_type(), SSL_set_tlsext_status_type() and
95       SSL_set_tlsext_status_ocsp_resp() return 0 on error or 1 on success.
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97       SSL_CTX_get_tlsext_status_type() returns the value previously set by
98       SSL_CTX_set_tlsext_status_type(), or -1 if not set.
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100       SSL_get_tlsext_status_ocsp_resp() returns the length of the OCSP
101       response data or -1 if there is no OCSP response data.
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103       SSL_get_tlsext_status_type() returns TLSEXT_STATUSTYPE_ocsp on the
104       client side if SSL_set_tlsext_status_type() was previously called, or
105       on the server side if the client requested OCSP stapling. Otherwise -1
106       is returned.
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HISTORY

109       The SSL_get_tlsext_status_type(), SSL_CTX_get_tlsext_status_type() and
110       SSL_CTX_set_tlsext_status_type() functions were added in OpenSSL 1.1.0.
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113       Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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115       Licensed under the OpenSSL license (the "License").  You may not use
116       this file except in compliance with the License.  You can obtain a copy
117       in the file LICENSE in the source distribution or at
118       <https://www.openssl.org/source/license.html>.
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1221.1.1c                            2019-05-28   SSL_CTX_SET_TLSEXT_STATUS_CB(3)
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