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OCSP_basic_verify.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" OCSP_resp_get0_certs, OCSP_resp_get0_signer, OCSP_resp_get0_id, OCSP_resp_get1_id, OCSP_resp_get0_produced_at, OCSP_resp_get0_signature, OCSP_resp_get0_tbs_sigalg, OCSP_resp_get0_respdata, OCSP_resp_find_status, OCSP_resp_count, OCSP_resp_get0, OCSP_resp_find, OCSP_single_get0_status, OCSP_check_validity, OCSP_basic_verify \&\- OCSP response utility functions .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/ocsp.h> \& \& int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status, \& int *reason, \& ASN1_GENERALIZEDTIME **revtime, \& ASN1_GENERALIZEDTIME **thisupd, \& ASN1_GENERALIZEDTIME **nextupd); \& \& int OCSP_resp_count(OCSP_BASICRESP *bs); \& OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx); \& int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last); \& int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason, \& ASN1_GENERALIZEDTIME **revtime, \& ASN1_GENERALIZEDTIME **thisupd, \& ASN1_GENERALIZEDTIME **nextupd); \& \& const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at( \& const OCSP_BASICRESP* single); \& \& const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs); \& const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs); \& const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs); \& const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs); \& \& int OCSP_resp_get0_signer(OCSP_BASICRESP *bs, X509 **signer, \& STACK_OF(X509) *extra_certs); \& \& int OCSP_resp_get0_id(const OCSP_BASICRESP *bs, \& const ASN1_OCTET_STRING **pid, \& const X509_NAME **pname); \& int OCSP_resp_get1_id(const OCSP_BASICRESP *bs, \& ASN1_OCTET_STRING **pid, \& X509_NAME **pname); \& \& int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, \& ASN1_GENERALIZEDTIME *nextupd, \& long sec, long maxsec); \& \& int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs, \& X509_STORE *st, unsigned long flags); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBOCSP_resp_find_status()\fR searches \fBbs\fR for an \s-1OCSP\s0 response for \fBid\fR. If it is successful the fields of the response are returned in \fB*status\fR, \fB*reason\fR, \&\fB*revtime\fR, \fB*thisupd\fR and \fB*nextupd\fR. The \fB*status\fR value will be one of \&\fBV_OCSP_CERTSTATUS_GOOD\fR, \fBV_OCSP_CERTSTATUS_REVOKED\fR or \&\fBV_OCSP_CERTSTATUS_UNKNOWN\fR. The \fB*reason\fR and \fB*revtime\fR fields are only set if the status is \fBV_OCSP_CERTSTATUS_REVOKED\fR. If set the \fB*reason\fR field will be set to the revocation reason which will be one of \&\fB\s-1OCSP_REVOKED_STATUS_NOSTATUS\s0\fR, \fB\s-1OCSP_REVOKED_STATUS_UNSPECIFIED\s0\fR, \&\fB\s-1OCSP_REVOKED_STATUS_KEYCOMPROMISE\s0\fR, \fB\s-1OCSP_REVOKED_STATUS_CACOMPROMISE\s0\fR, \&\fB\s-1OCSP_REVOKED_STATUS_AFFILIATIONCHANGED\s0\fR, \fB\s-1OCSP_REVOKED_STATUS_SUPERSEDED\s0\fR, \&\fB\s-1OCSP_REVOKED_STATUS_CESSATIONOFOPERATION\s0\fR, \&\fB\s-1OCSP_REVOKED_STATUS_CERTIFICATEHOLD\s0\fR or \fB\s-1OCSP_REVOKED_STATUS_REMOVEFROMCRL\s0\fR. .PP \&\fBOCSP_resp_count()\fR returns the number of \fB\s-1OCSP_SINGLERESP\s0\fR structures in \fBbs\fR. .PP \&\fBOCSP_resp_get0()\fR returns the \fB\s-1OCSP_SINGLERESP\s0\fR structure in \fBbs\fR corresponding to index \fBidx\fR. Where \fBidx\fR runs from 0 to OCSP_resp_count(bs) \- 1. .PP \&\fBOCSP_resp_find()\fR searches \fBbs\fR for \fBid\fR and returns the index of the first matching entry after \fBlast\fR or starting from the beginning if \fBlast\fR is \-1. .PP \&\fBOCSP_single_get0_status()\fR extracts the fields of \fBsingle\fR in \fB*reason\fR, \&\fB*revtime\fR, \fB*thisupd\fR and \fB*nextupd\fR. .PP \&\fBOCSP_resp_get0_produced_at()\fR extracts the \fBproducedAt\fR field from the single response \fBbs\fR. .PP \&\fBOCSP_resp_get0_signature()\fR returns the signature from \fBbs\fR. .PP \&\fBOCSP_resp_get0_tbs_sigalg()\fR returns the \fBsignatureAlgorithm\fR from \fBbs\fR. .PP \&\fBOCSP_resp_get0_respdata()\fR returns the \fBtbsResponseData\fR from \fBbs\fR. .PP \&\fBOCSP_resp_get0_certs()\fR returns any certificates included in \fBbs\fR. .PP \&\fBOCSP_resp_get0_signer()\fR attempts to retrieve the certificate that directly signed \fBbs\fR. The \s-1OCSP\s0 protocol does not require that this certificate is included in the \fBcerts\fR field of the response, so additional certificates can be supplied in \fBextra_certs\fR if the certificates that may have signed the response are known via some out-of-band mechanism. .PP \&\fBOCSP_resp_get0_id()\fR gets the responder id of \fBbs\fR. If the responder \s-1ID\s0 is a name then <*pname> is set to the name and \fB*pid\fR is set to \s-1NULL.\s0 If the responder \s-1ID\s0 is by key \s-1ID\s0 then \fB*pid\fR is set to the key \s-1ID\s0 and \fB*pname\fR is set to \s-1NULL.\s0 \fBOCSP_resp_get1_id()\fR leaves ownership of \fB*pid\fR and \fB*pname\fR with the caller, who is responsible for freeing them. Both functions return 1 in case of success and 0 in case of failure. If \fBOCSP_resp_get1_id()\fR returns 0, no freeing of the results is necessary. .PP \&\fBOCSP_check_validity()\fR checks the validity of \fBthisupd\fR and \fBnextupd\fR values which will be typically obtained from \fBOCSP_resp_find_status()\fR or \&\fBOCSP_single_get0_status()\fR. If \fBsec\fR is nonzero it indicates how many seconds leeway should be allowed in the check. If \fBmaxsec\fR is positive it indicates the maximum age of \fBthisupd\fR in seconds. .PP \&\fBOCSP_basic_verify()\fR checks that the basic response message \fBbs\fR is correctly signed and that the signer certificate can be validated. It takes \fBst\fR as the trusted store and \fBcerts\fR as a set of untrusted intermediate certificates. The function first tries to find the signer certificate of the response in <certs>. It also searches the certificates the responder may have included in \fBbs\fR unless the \fBflags\fR contain \fB\s-1OCSP_NOINTERN\s0\fR. It fails if the signer certificate cannot be found. Next, the function checks the signature of \fBbs\fR and fails on error unless the \fBflags\fR contain \fB\s-1OCSP_NOSIGS\s0\fR. Then the function already returns success if the \fBflags\fR contain \fB\s-1OCSP_NOVERIFY\s0\fR or if the signer certificate was found in \fBcerts\fR and the \fBflags\fR contain \fB\s-1OCSP_TRUSTOTHER\s0\fR. Otherwise the function continues by validating the signer certificate. To this end, all certificates in \fBcert\fR and in \fBbs\fR are considered as untrusted certificates for the construction of the validation path for the signer certificate unless the \fB\s-1OCSP_NOCHAIN\s0\fR flag is set. After successful path validation the function returns success if the \fB\s-1OCSP_NOCHECKS\s0\fR flag is set. Otherwise it verifies that the signer certificate meets the \s-1OCSP\s0 issuer criteria including potential delegation. If this does not succeed and the \&\fBflags\fR do not contain \fB\s-1OCSP_NOEXPLICIT\s0\fR the function checks for explicit trust for \s-1OCSP\s0 signing in the root \s-1CA\s0 certificate. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBOCSP_resp_find_status()\fR returns 1 if \fBid\fR is found in \fBbs\fR and 0 otherwise. .PP \&\fBOCSP_resp_count()\fR returns the total number of \fB\s-1OCSP_SINGLERESP\s0\fR fields in \&\fBbs\fR. .PP \&\fBOCSP_resp_get0()\fR returns a pointer to an \fB\s-1OCSP_SINGLERESP\s0\fR structure or \&\fB\s-1NULL\s0\fR if \fBidx\fR is out of range. .PP \&\fBOCSP_resp_find()\fR returns the index of \fBid\fR in \fBbs\fR (which may be 0) or \-1 if \&\fBid\fR was not found. .PP \&\fBOCSP_single_get0_status()\fR returns the status of \fBsingle\fR or \-1 if an error occurred. .PP \&\fBOCSP_resp_get0_signer()\fR returns 1 if the signing certificate was located, or 0 on error. .PP \&\fBOCSP_basic_verify()\fR returns 1 on success, 0 on error, or \-1 on fatal error such as malloc failure. .SH "NOTES" .IX Header "NOTES" Applications will typically call \fBOCSP_resp_find_status()\fR using the certificate \&\s-1ID\s0 of interest and then check its validity using \fBOCSP_check_validity()\fR. They can then take appropriate action based on the status of the certificate. .PP An \s-1OCSP\s0 response for a certificate contains \fBthisUpdate\fR and \fBnextUpdate\fR fields. Normally the current time should be between these two values. To account for clock skew the \fBmaxsec\fR field can be set to nonzero in \&\fBOCSP_check_validity()\fR. Some responders do not set the \fBnextUpdate\fR field, this would otherwise mean an ancient response would be considered valid: the \&\fBmaxsec\fR parameter to \fBOCSP_check_validity()\fR can be used to limit the permitted age of responses. .PP The values written to \fB*revtime\fR, \fB*thisupd\fR and \fB*nextupd\fR by \&\fBOCSP_resp_find_status()\fR and \fBOCSP_single_get0_status()\fR are internal pointers which \fB\s-1MUST NOT\s0\fR be freed up by the calling application. Any or all of these parameters can be set to \s-1NULL\s0 if their value is not required. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBcrypto\fR\|(7), \&\fBOCSP_cert_to_id\fR\|(3), \&\fBOCSP_request_add1_nonce\fR\|(3), \&\fBOCSP_REQUEST_new\fR\|(3), \&\fBOCSP_response_status\fR\|(3), \&\fBOCSP_sendreq_new\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2015\-2020 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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