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diff --git a/man/fido_assert_new.3 b/man/fido_assert_new.3 new file mode 100644 index 0000000..192625e --- /dev/null +++ b/man/fido_assert_new.3 @@ -0,0 +1,285 @@ +.\" Copyright (c) 2018-2022 Yubico AB. All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions are +.\" met: +.\" +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in +.\" the documentation and/or other materials provided with the +.\" distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +.\" "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +.\" A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +.\" HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +.\" LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +.\" OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" +.Dd $Mdocdate: April 27 2022 $ +.Dt FIDO_ASSERT_NEW 3 +.Os +.Sh NAME +.Nm fido_assert_new , +.Nm fido_assert_free , +.Nm fido_assert_count , +.Nm fido_assert_rp_id , +.Nm fido_assert_user_display_name , +.Nm fido_assert_user_icon , +.Nm fido_assert_user_name , +.Nm fido_assert_authdata_ptr , +.Nm fido_assert_blob_ptr , +.Nm fido_assert_clientdata_hash_ptr , +.Nm fido_assert_hmac_secret_ptr , +.Nm fido_assert_largeblob_key_ptr , +.Nm fido_assert_user_id_ptr , +.Nm fido_assert_sig_ptr , +.Nm fido_assert_id_ptr , +.Nm fido_assert_authdata_len , +.Nm fido_assert_blob_len , +.Nm fido_assert_clientdata_hash_len , +.Nm fido_assert_hmac_secret_len , +.Nm fido_assert_largeblob_key_len , +.Nm fido_assert_user_id_len , +.Nm fido_assert_sig_len , +.Nm fido_assert_id_len , +.Nm fido_assert_sigcount , +.Nm fido_assert_flags +.Nd FIDO2 assertion API +.Sh SYNOPSIS +.In fido.h +.Ft fido_assert_t * +.Fn fido_assert_new "void" +.Ft void +.Fn fido_assert_free "fido_assert_t **assert_p" +.Ft size_t +.Fn fido_assert_count "const fido_assert_t *assert" +.Ft const char * +.Fn fido_assert_rp_id "const fido_assert_t *assert" +.Ft const char * +.Fn fido_assert_user_display_name "const fido_assert_t *assert" "size_t idx" +.Ft const char * +.Fn fido_assert_user_icon "const fido_assert_t *assert" "size_t idx" +.Ft const char * +.Fn fido_assert_user_name "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_authdata_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_clientdata_hash_ptr "const fido_assert_t *assert" +.Ft const unsigned char * +.Fn fido_assert_blob_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_hmac_secret_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_largeblob_key_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_user_id_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_sig_ptr "const fido_assert_t *assert" "size_t idx" +.Ft const unsigned char * +.Fn fido_assert_id_ptr "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_authdata_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_clientdata_hash_len "const fido_assert_t *assert" +.Ft size_t +.Fn fido_assert_blob_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_hmac_secret_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_largeblob_key_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_user_id_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_sig_len "const fido_assert_t *assert" "size_t idx" +.Ft size_t +.Fn fido_assert_id_len "const fido_assert_t *assert" "size_t idx" +.Ft uint32_t +.Fn fido_assert_sigcount "const fido_assert_t *assert" "size_t idx" +.Ft uint8_t +.Fn fido_assert_flags "const fido_assert_t *assert" "size_t idx" +.Sh DESCRIPTION +A FIDO2 assertion is a collection of statements, each statement a +map between a challenge, a credential, a signature, and ancillary +attributes. +In +.Em libfido2 , +a FIDO2 assertion is abstracted by the +.Vt fido_assert_t +type. +The functions described in this page allow a +.Vt fido_assert_t +type to be allocated, deallocated, and inspected. +For other operations on +.Vt fido_assert_t , +please refer to +.Xr fido_assert_set_authdata 3 , +.Xr fido_assert_allow_cred 3 , +.Xr fido_assert_verify 3 , +and +.Xr fido_dev_get_assert 3 . +.Pp +The +.Fn fido_assert_new +function returns a pointer to a newly allocated, empty +.Vt fido_assert_t +type. +If memory cannot be allocated, NULL is returned. +.Pp +The +.Fn fido_assert_free +function releases the memory backing +.Fa *assert_p , +where +.Fa *assert_p +must have been previously allocated by +.Fn fido_assert_new . +On return, +.Fa *assert_p +is set to NULL. +Either +.Fa assert_p +or +.Fa *assert_p +may be NULL, in which case +.Fn fido_assert_free +is a NOP. +.Pp +The +.Fn fido_assert_count +function returns the number of statements in +.Fa assert . +.Pp +The +.Fn fido_assert_rp_id +function returns a pointer to a NUL-terminated string holding the +relying party ID of +.Fa assert . +.Pp +The +.Fn fido_assert_user_display_name , +.Fn fido_assert_user_icon , +and +.Fn fido_assert_user_name , +functions return pointers to the user display name, icon, and +name attributes of statement +.Fa idx +in +.Fa assert . +If not NULL, the values returned by these functions point to +NUL-terminated UTF-8 strings. +The user display name, icon, and name attributes will typically +only be returned by the authenticator if user verification was +performed by the authenticator and multiple resident/discoverable +credentials were involved in the assertion. +.Pp +The +.Fn fido_assert_authdata_ptr , +.Fn fido_assert_clientdata_hash_ptr , +.Fn fido_assert_id_ptr , +.Fn fido_assert_user_id_ptr , +.Fn fido_assert_sig_ptr , +.Fn fido_assert_sigcount , +and +.Fn fido_assert_flags +functions return pointers to the CBOR-encoded authenticator data, +client data hash, credential ID, user ID, signature, signature +count, and authenticator data flags of statement +.Fa idx +in +.Fa assert . +.Pp +The +.Fn fido_assert_hmac_secret_ptr +function returns a pointer to the hmac-secret attribute of statement +.Fa idx +in +.Fa assert . +The HMAC Secret Extension +.Pq hmac-secret +is a CTAP 2.0 extension. +Note that the resulting hmac-secret varies according to whether +user verification was performed by the authenticator. +.Pp +The +.Fn fido_assert_blob_ptr +and +.Fn fido_assert_largeblob_key_ptr +functions return pointers to the +.Dq credBlob +and +.Dq largeBlobKey +attributes of statement +.Fa idx +in +.Fa assert . +Credential Blob +.Pq credBlob +and +Large Blob Key +.Pq largeBlobKey +are CTAP 2.1 extensions. +.Pp +The +.Fn fido_assert_authdata_len , +.Fn fido_assert_clientdata_hash_len , +.Fn fido_assert_id_len , +.Fn fido_assert_user_id_len , +.Fn fido_assert_sig_len , +.Fn fido_assert_hmac_secret_len , +.Fn fido_assert_blob_len , +and +.Fn fido_assert_largeblob_key_len +functions return the length of a given attribute. +.Pp +Please note that the first statement in +.Fa assert +has an +.Fa idx +(index) value of 0. +.Pp +The authenticator data and signature parts of an assertion +statement are typically passed to a FIDO2 server for verification. +.Sh RETURN VALUES +The authenticator data returned by +.Fn fido_assert_authdata_ptr +is a CBOR-encoded byte string, as obtained from the authenticator. +.Pp +The +.Fn fido_assert_rp_id , +.Fn fido_assert_user_display_name , +.Fn fido_assert_user_icon , +.Fn fido_assert_user_name , +.Fn fido_assert_authdata_ptr , +.Fn fido_assert_clientdata_hash_ptr , +.Fn fido_assert_id_ptr , +.Fn fido_assert_user_id_ptr , +.Fn fido_assert_sig_ptr , +.Fn fido_assert_hmac_secret_ptr , +.Fn fido_assert_blob_ptr , +and +.Fn fido_assert_largeblob_key_ptr +functions may return NULL if the respective field in +.Fa assert +is not set. +If not NULL, returned pointers are guaranteed to exist until any API +function that takes +.Fa assert +without the +.Em const +qualifier is invoked. +.Sh SEE ALSO +.Xr fido_assert_allow_cred 3 , +.Xr fido_assert_set_authdata 3 , +.Xr fido_assert_verify 3 , +.Xr fido_dev_get_assert 3 , +.Xr fido_dev_largeblob_get 3 |