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221 lines
9.7 KiB
Plaintext
221 lines
9.7 KiB
Plaintext
=pod
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=head1 NAME
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OCSP_resp_find_status, OCSP_resp_count,
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OCSP_resp_get0, OCSP_resp_find, OCSP_single_get0_status,
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OCSP_resp_get0_produced_at, OCSP_resp_get0_signature,
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OCSP_resp_get0_tbs_sigalg, OCSP_resp_get0_respdata,
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OCSP_resp_get0_certs, OCSP_resp_get0_signer,
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OCSP_resp_get0_id, OCSP_resp_get1_id,
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OCSP_check_validity, OCSP_basic_verify
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- OCSP response utility functions
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=head1 SYNOPSIS
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#include <openssl/ocsp.h>
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int OCSP_resp_find_status(OCSP_BASICRESP *bs, OCSP_CERTID *id, int *status,
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int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd);
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int OCSP_resp_count(OCSP_BASICRESP *bs);
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OCSP_SINGLERESP *OCSP_resp_get0(OCSP_BASICRESP *bs, int idx);
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int OCSP_resp_find(OCSP_BASICRESP *bs, OCSP_CERTID *id, int last);
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int OCSP_single_get0_status(OCSP_SINGLERESP *single, int *reason,
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ASN1_GENERALIZEDTIME **revtime,
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ASN1_GENERALIZEDTIME **thisupd,
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ASN1_GENERALIZEDTIME **nextupd);
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const ASN1_GENERALIZEDTIME *OCSP_resp_get0_produced_at(
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const OCSP_BASICRESP* single);
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const ASN1_OCTET_STRING *OCSP_resp_get0_signature(const OCSP_BASICRESP *bs);
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const X509_ALGOR *OCSP_resp_get0_tbs_sigalg(const OCSP_BASICRESP *bs);
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const OCSP_RESPDATA *OCSP_resp_get0_respdata(const OCSP_BASICRESP *bs);
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const STACK_OF(X509) *OCSP_resp_get0_certs(const OCSP_BASICRESP *bs);
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int OCSP_resp_get0_signer(OCSP_BASICRESP *bs, X509 **signer,
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STACK_OF(X509) *extra_certs);
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int OCSP_resp_get0_id(const OCSP_BASICRESP *bs,
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const ASN1_OCTET_STRING **pid,
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const X509_NAME **pname);
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int OCSP_resp_get1_id(const OCSP_BASICRESP *bs,
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ASN1_OCTET_STRING **pid,
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X509_NAME **pname);
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int OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd,
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ASN1_GENERALIZEDTIME *nextupd,
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long sec, long maxsec);
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int OCSP_basic_verify(OCSP_BASICRESP *bs, STACK_OF(X509) *certs,
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X509_STORE *st, unsigned long flags);
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=head1 DESCRIPTION
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OCSP_resp_find_status() searches I<bs> for an OCSP response for I<id>. If it is
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successful the fields of the response are returned in I<*status>, I<*reason>,
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I<*revtime>, I<*thisupd> and I<*nextupd>. The I<*status> value will be one of
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B<V_OCSP_CERTSTATUS_GOOD>, B<V_OCSP_CERTSTATUS_REVOKED> or
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B<V_OCSP_CERTSTATUS_UNKNOWN>. The I<*reason> and I<*revtime> fields are only
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set if the status is B<V_OCSP_CERTSTATUS_REVOKED>. If set the I<*reason> field
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will be set to the revocation reason which will be one of
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B<OCSP_REVOKED_STATUS_NOSTATUS>, B<OCSP_REVOKED_STATUS_UNSPECIFIED>,
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B<OCSP_REVOKED_STATUS_KEYCOMPROMISE>, B<OCSP_REVOKED_STATUS_CACOMPROMISE>,
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B<OCSP_REVOKED_STATUS_AFFILIATIONCHANGED>, B<OCSP_REVOKED_STATUS_SUPERSEDED>,
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B<OCSP_REVOKED_STATUS_CESSATIONOFOPERATION>,
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B<OCSP_REVOKED_STATUS_CERTIFICATEHOLD> or B<OCSP_REVOKED_STATUS_REMOVEFROMCRL>.
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OCSP_resp_count() returns the number of B<OCSP_SINGLERESP> structures in I<bs>.
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OCSP_resp_get0() returns the B<OCSP_SINGLERESP> structure in I<bs> corresponding
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to index I<idx>, where I<idx> runs from 0 to OCSP_resp_count(bs) - 1.
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OCSP_resp_find() searches I<bs> for I<id> and returns the index of the first
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matching entry after I<last> or starting from the beginning if I<last> is -1.
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OCSP_single_get0_status() extracts the fields of I<single> in I<*reason>,
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I<*revtime>, I<*thisupd> and I<*nextupd>.
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OCSP_resp_get0_produced_at() extracts the B<producedAt> field from the
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single response I<bs>.
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OCSP_resp_get0_signature() returns the signature from I<bs>.
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OCSP_resp_get0_tbs_sigalg() returns the B<signatureAlgorithm> from I<bs>.
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OCSP_resp_get0_respdata() returns the B<tbsResponseData> from I<bs>.
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OCSP_resp_get0_certs() returns any certificates included in I<bs>.
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OCSP_resp_get0_signer() attempts to retrieve the certificate that directly
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signed I<bs>. The OCSP protocol does not require that this certificate
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is included in the B<certs> field of the response, so additional certificates
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can be supplied via the I<extra_certs> if the certificates that may have
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signed the response are known via some out-of-band mechanism.
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OCSP_resp_get0_id() gets the responder id of I<bs>. If the responder ID is
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a name then <*pname> is set to the name and I<*pid> is set to NULL. If the
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responder ID is by key ID then I<*pid> is set to the key ID and I<*pname>
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is set to NULL.
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OCSP_resp_get1_id() is the same as OCSP_resp_get0_id()
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but leaves ownership of I<*pid> and I<*pname> with the caller,
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who is responsible for freeing them unless the function returns 0.
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OCSP_check_validity() checks the validity of its I<thisupd> and I<nextupd>
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arguments, which will be typically obtained from OCSP_resp_find_status() or
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OCSP_single_get0_status(). If I<sec> is nonzero it indicates how many seconds
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leeway should be allowed in the check. If I<maxsec> is positive it indicates
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the maximum age of I<thisupd> in seconds.
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OCSP_basic_verify() checks that the basic response message I<bs> is correctly
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signed and that the signer certificate can be validated. It takes I<st> as
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the trusted store and I<certs> as a set of untrusted intermediate certificates.
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The function first tries to find the signer certificate of the response
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in I<certs>. It then searches the certificates the responder may have included
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in I<bs> unless I<flags> contains B<OCSP_NOINTERN>.
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It fails if the signer certificate cannot be found.
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Next, unless I<flags> contains B<OCSP_NOSIGS>, the function checks
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the signature of I<bs> and fails on error. Then the function already returns
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success if I<flags> contains B<OCSP_NOVERIFY> or if the signer certificate
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was found in I<certs> and I<flags> contains B<OCSP_TRUSTOTHER>.
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Otherwise the function continues by validating the signer certificate.
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If I<flags> contains B<OCSP_PARTIAL_CHAIN> it takes intermediate CA
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certificates in I<st> as trust anchors.
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For more details, see the description of B<X509_V_FLAG_PARTIAL_CHAIN>
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in L<X509_VERIFY_PARAM_set_flags(3)/VERIFICATION FLAGS>.
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If I<flags> contains B<OCSP_NOCHAIN> it ignores all certificates in I<certs>
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and in I<bs>, else it takes them as untrusted intermediate CA certificates
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and uses them for constructing the validation path for the signer certificate.
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Certificate revocation status checks using CRLs is disabled during path validation
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if the signer certificate contains the B<id-pkix-ocsp-no-check> extension.
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After successful path
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validation the function returns success if the B<OCSP_NOCHECKS> flag is set.
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Otherwise it verifies that the signer certificate meets the OCSP issuer
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criteria including potential delegation. If this does not succeed and the
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B<OCSP_NOEXPLICIT> flag is not set the function checks for explicit
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trust for OCSP signing in the root CA certificate.
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=head1 RETURN VALUES
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OCSP_resp_find_status() returns 1 if I<id> is found in I<bs> and 0 otherwise.
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OCSP_resp_count() returns the total number of B<OCSP_SINGLERESP> fields in I<bs>
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or -1 on error.
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OCSP_resp_get0() returns a pointer to an B<OCSP_SINGLERESP> structure or
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NULL on error, such as I<idx> being out of range.
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OCSP_resp_find() returns the index of I<id> in I<bs> (which may be 0)
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or -1 on error, such as when I<id> was not found.
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OCSP_single_get0_status() returns the status of I<single> or -1 if an error
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occurred.
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OCSP_resp_get0_produced_at() returns the B<producedAt> field from I<bs>.
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OCSP_resp_get0_signature() returns the signature from I<bs>.
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OCSP_resp_get0_tbs_sigalg() returns the B<signatureAlgorithm> field from I<bs>.
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OCSP_resp_get0_respdata() returns the B<tbsResponseData> field from I<bs>.
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OCSP_resp_get0_certs() returns any certificates included in I<bs>.
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OCSP_resp_get0_signer() returns 1 if the signing certificate was located,
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or 0 if not found or on error.
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OCSP_resp_get0_id() and OCSP_resp_get1_id() return 1 on success, 0 on failure.
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OCSP_check_validity() returns 1 if I<thisupd> and I<nextupd> are valid time
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values and the current time + I<sec> is not before I<thisupd> and,
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if I<maxsec> >= 0, the current time - I<maxsec> is not past I<nextupd>.
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Otherwise it returns 0 to indicate an error.
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OCSP_basic_verify() returns 1 on success, 0 on verification not successful,
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or -1 on a fatal error such as malloc failure.
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=head1 NOTES
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Applications will typically call OCSP_resp_find_status() using the certificate
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ID of interest and then check its validity using OCSP_check_validity(). They
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can then take appropriate action based on the status of the certificate.
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An OCSP response for a certificate contains B<thisUpdate> and B<nextUpdate>
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fields. Normally the current time should be between these two values. To
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account for clock skew the I<maxsec> field can be set to nonzero in
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OCSP_check_validity(). Some responders do not set the B<nextUpdate> field, this
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would otherwise mean an ancient response would be considered valid: the
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I<maxsec> parameter to OCSP_check_validity() can be used to limit the permitted
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age of responses.
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The values written to I<*revtime>, I<*thisupd> and I<*nextupd> by
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OCSP_resp_find_status() and OCSP_single_get0_status() are internal pointers
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which MUST NOT be freed up by the calling application. Any or all of these
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parameters can be set to NULL if their value is not required.
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=head1 SEE ALSO
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L<crypto(7)>,
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L<OCSP_cert_to_id(3)>,
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L<OCSP_request_add1_nonce(3)>,
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L<OCSP_REQUEST_new(3)>,
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L<OCSP_response_status(3)>,
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L<OCSP_sendreq_new(3)>,
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L<X509_VERIFY_PARAM_set_flags(3)>
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=head1 COPYRIGHT
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Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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