1=pod
2
3=head1 NAME
4
5OCSP_resp_get0_certs,
6OCSP_resp_get0_signer,
7OCSP_resp_get0_id,
8OCSP_resp_get1_id,
9OCSP_resp_get0_produced_at,
10OCSP_resp_get0_signature,
11OCSP_resp_get0_tbs_sigalg,
12OCSP_resp_get0_respdata,
13OCSP_resp_find_status, OCSP_resp_count, OCSP_resp_get0, OCSP_resp_find,
14OCSP_single_get0_status, OCSP_check_validity,
15OCSP_basic_verify
16- OCSP response utility functions
17
18=head1 SYNOPSIS
19
20 #include <openssl/ocsp.h>
21
22 int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
23                           int *reason,
24                           ASN1_GENERALIZEDTIME **revtime,
25                           ASN1_GENERALIZEDTIME **thisupd,
26                           ASN1_GENERALIZEDTIME **nextupd);
27
28 int OCSP_resp_count(OCSP_BASICRESP *bs);
29 OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx);
30 int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last);
31 int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
32                             ASN1_GENERALIZEDTIME **revtime,
33                             ASN1_GENERALIZEDTIME **thisupd,
34                             ASN1_GENERALIZEDTIME **nextupd);
35
36 const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(
37                             const OCSP_BASICRESP* single);
38
39 const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs);
40 const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs);
41 const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs);
42 const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs);
43
44 int OCSP_resp_get0_signer(OCSP_BASICRESP *bs, X509 **signer,
45                           STACK_OF(X509) *extra_certs);
46
47 int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
48                       const ASN1_OCTET_STRING **pid,
49                       const X509_NAME **pname);
50 int OCSP_resp_get1_id(const OCSP_BASICRESP *bs,
51                       ASN1_OCTET_STRING **pid,
52                       X509_NAME **pname);
53
54 int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
55                         ASN1_GENERALIZEDTIME *nextupd,
56                         long sec, long maxsec);
57
58 int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
59                      X509_STORE *st, unsigned long flags);
60
61=head1 DESCRIPTION
62
63OCSP_resp_find_status() searches B<bs> for an OCSP response for B<id>. If it is
64successful the fields of the response are returned in B<*status>, B<*reason>,
65B<*revtime>, B<*thisupd> and B<*nextupd>.  The B<*status> value will be one of
66B<V_OCSP_CERTSTATUS_GOOD>, B<V_OCSP_CERTSTATUS_REVOKED> or
67B<V_OCSP_CERTSTATUS_UNKNOWN>. The B<*reason> and B<*revtime> fields are only
68set if the status is B<V_OCSP_CERTSTATUS_REVOKED>. If set the B<*reason> field
69will be set to the revocation reason which will be one of
70B<OCSP_REVOKED_STATUS_NOSTATUS>, B<OCSP_REVOKED_STATUS_UNSPECIFIED>,
71B<OCSP_REVOKED_STATUS_KEYCOMPROMISE>, B<OCSP_REVOKED_STATUS_CACOMPROMISE>,
72B<OCSP_REVOKED_STATUS_AFFILIATIONCHANGED>, B<OCSP_REVOKED_STATUS_SUPERSEDED>,
73B<OCSP_REVOKED_STATUS_CESSATIONOFOPERATION>,
74B<OCSP_REVOKED_STATUS_CERTIFICATEHOLD> or B<OCSP_REVOKED_STATUS_REMOVEFROMCRL>.
75
76OCSP_resp_count() returns the number of B<OCSP_SINGLERESP> structures in B<bs>.
77
78OCSP_resp_get0() returns the B<OCSP_SINGLERESP> structure in B<bs>
79corresponding to index B<idx>. Where B<idx> runs from 0 to
80OCSP_resp_count(bs) - 1.
81
82OCSP_resp_find() searches B<bs> for B<id> and returns the index of the first
83matching entry after B<last> or starting from the beginning if B<last> is -1.
84
85OCSP_single_get0_status() extracts the fields of B<single> in B<*reason>,
86B<*revtime>, B<*thisupd> and B<*nextupd>.
87
88OCSP_resp_get0_produced_at() extracts the B<producedAt> field from the
89single response B<bs>.
90
91OCSP_resp_get0_signature() returns the signature from B<bs>.
92
93OCSP_resp_get0_tbs_sigalg() returns the B<signatureAlgorithm> from B<bs>.
94
95OCSP_resp_get0_respdata() returns the B<tbsResponseData> from B<bs>.
96
97OCSP_resp_get0_certs() returns any certificates included in B<bs>.
98
99OCSP_resp_get0_signer() attempts to retrieve the certificate that directly
100signed B<bs>.  The OCSP protocol does not require that this certificate
101is included in the B<certs> field of the response, so additional certificates
102can be supplied in B<extra_certs> if the certificates that may have
103signed the response are known via some out-of-band mechanism.
104
105OCSP_resp_get0_id() gets the responder id of B<bs>. If the responder ID is
106a name then <*pname> is set to the name and B<*pid> is set to NULL. If the
107responder ID is by key ID then B<*pid> is set to the key ID and B<*pname>
108is set to NULL. OCSP_resp_get1_id() leaves ownership of B<*pid> and B<*pname>
109with the caller, who is responsible for freeing them. Both functions return 1
110in case of success and 0 in case of failure. If OCSP_resp_get1_id() returns 0,
111no freeing of the results is necessary.
112
113OCSP_check_validity() checks the validity of B<thisupd> and B<nextupd> values
114which will be typically obtained from OCSP_resp_find_status() or
115OCSP_single_get0_status(). If B<sec> is non-zero it indicates how many seconds
116leeway should be allowed in the check. If B<maxsec> is positive it indicates
117the maximum age of B<thisupd> in seconds.
118
119OCSP_basic_verify() checks that the basic response message B<bs> is correctly
120signed and that the signer certificate can be validated. It takes B<st> as
121the trusted store and B<certs> as a set of untrusted intermediate certificates.
122The function first tries to find the signer certificate of the response
123in <certs>. It also searches the certificates the responder may have included
124in B<bs> unless the B<flags> contain B<OCSP_NOINTERN>.
125It fails if the signer certificate cannot be found.
126Next, the function checks the signature of B<bs> and fails on error
127unless the B<flags> contain B<OCSP_NOSIGS>. Then the function already returns
128success if the B<flags> contain B<OCSP_NOVERIFY> or if the signer certificate
129was found in B<certs> and the B<flags> contain B<OCSP_TRUSTOTHER>.
130Otherwise the function continues by validating the signer certificate.
131To this end, all certificates in B<cert> and in B<bs> are considered as
132untrusted certificates for the construction of the validation path for the
133signer certificate unless the B<OCSP_NOCHAIN> flag is set. After successful path
134validation the function returns success if the B<OCSP_NOCHECKS> flag is set.
135Otherwise it verifies that the signer certificate meets the OCSP issuer
136criteria including potential delegation. If this does not succeed and the
137B<flags> do not contain B<OCSP_NOEXPLICIT> the function checks for explicit
138trust for OCSP signing in the root CA certificate.
139
140=head1 RETURN VALUES
141
142OCSP_resp_find_status() returns 1 if B<id> is found in B<bs> and 0 otherwise.
143
144OCSP_resp_count() returns the total number of B<OCSP_SINGLERESP> fields in
145B<bs>.
146
147OCSP_resp_get0() returns a pointer to an B<OCSP_SINGLERESP> structure or
148B<NULL> if B<idx> is out of range.
149
150OCSP_resp_find() returns the index of B<id> in B<bs> (which may be 0) or -1 if
151B<id> was not found.
152
153OCSP_single_get0_status() returns the status of B<single> or -1 if an error
154occurred.
155
156OCSP_resp_get0_signer() returns 1 if the signing certificate was located,
157or 0 on error.
158
159OCSP_basic_verify() returns 1 on success, 0 on error, or -1 on fatal error such
160as malloc failure.
161
162=head1 NOTES
163
164Applications will typically call OCSP_resp_find_status() using the certificate
165ID of interest and then check its validity using OCSP_check_validity(). They
166can then take appropriate action based on the status of the certificate.
167
168An OCSP response for a certificate contains B<thisUpdate> and B<nextUpdate>
169fields. Normally the current time should be between these two values. To
170account for clock skew the B<maxsec> field can be set to non-zero in
171OCSP_check_validity(). Some responders do not set the B<nextUpdate> field, this
172would otherwise mean an ancient response would be considered valid: the
173B<maxsec> parameter to OCSP_check_validity() can be used to limit the permitted
174age of responses.
175
176The values written to B<*revtime>, B<*thisupd> and B<*nextupd> by
177OCSP_resp_find_status() and OCSP_single_get0_status() are internal pointers
178which B<MUST NOT> be freed up by the calling application. Any or all of these
179parameters can be set to NULL if their value is not required.
180
181=head1 SEE ALSO
182
183L<crypto(7)>,
184L<OCSP_cert_to_id(3)>,
185L<OCSP_request_add1_nonce(3)>,
186L<OCSP_REQUEST_new(3)>,
187L<OCSP_response_status(3)>,
188L<OCSP_sendreq_new(3)>
189
190=head1 COPYRIGHT
191
192Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
193
194Licensed under the OpenSSL license (the "License").  You may not use
195this file except in compliance with the License.  You can obtain a copy
196in the file LICENSE in the source distribution or at
197L<https://www.openssl.org/source/license.html>.
198
199=cut
200