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4674aaf4f2
3.0.0 is a habit from pre-3.0 OpenSSL, which doesn't make sense with the new version scheme. Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9376)
100 lines
3.6 KiB
Plaintext
100 lines
3.6 KiB
Plaintext
=pod
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=head1 NAME
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SRP_VBASE_new,
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SRP_VBASE_free,
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SRP_VBASE_init,
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SRP_VBASE_add0_user,
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SRP_VBASE_get1_by_user,
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SRP_VBASE_get_by_user
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- Functions to create and manage a stack of SRP user verifier information
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=head1 SYNOPSIS
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#include <openssl/srp.h>
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SRP_VBASE *SRP_VBASE_new(char *seed_key);
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void SRP_VBASE_free(SRP_VBASE *vb);
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int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);
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int SRP_VBASE_add0_user(SRP_VBASE *vb, SRP_user_pwd *user_pwd);
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SRP_user_pwd *SRP_VBASE_get1_by_user(SRP_VBASE *vb, char *username);
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SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username);
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=head1 DESCRIPTION
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The SRP_VBASE_new() function allocates a structure to store server side SRP
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verifier information.
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If B<seed_key> is not NULL a copy is stored and used to generate dummy parameters
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for users that are not found by SRP_VBASE_get1_by_user(). This allows the server
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to hide the fact that it doesn't have a verifier for a particular username,
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as described in section 2.5.1.3 'Unknown SRP' of RFC 5054.
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The seed string should contain random NUL terminated binary data (therefore
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the random data should not contain NUL bytes!).
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The SRP_VBASE_free() function frees up the B<vb> structure.
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If B<vb> is NULL, nothing is done.
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The SRP_VBASE_init() function parses the information in a verifier file and
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populates the B<vb> structure.
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The verifier file is a text file containing multiple entries, whose format is:
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flag base64(verifier) base64(salt) username gNid userinfo(optional)
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where the flag can be 'V' (valid) or 'R' (revoked).
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Note that the base64 encoding used here is non-standard so it is recommended
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to use L<srp(1)> to generate this file.
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The SRP_VBASE_add0_user() function adds the B<user_pwd> verifier information
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to the B<vb> structure. See L<SRP_user_pwd_new(3)> to create and populate this
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record.
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The library takes ownership of B<user_pwd>, it should not be freed by the caller.
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The SRP_VBASE_get1_by_user() function returns the password info for the user
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whose username matches B<username>. It replaces the deprecated
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SRP_VBASE_get_by_user().
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If no matching user is found but a seed_key and default gN parameters have been
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set, dummy authentication information is generated from the seed_key, allowing
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the server to hide the fact that it doesn't have a verifier for a particular
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username. When using SRP as a TLS authentication mechanism, this will cause
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the handshake to proceed normally but the first client will be rejected with
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a "bad_record_mac" alert, as if the password was incorrect.
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If no matching user is found and the seed_key is not set, NULL is returned.
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Ownership of the returned pointer is released to the caller, it must be freed
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with SRP_user_pwd_free().
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=head1 RETURN VALUES
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SRP_VBASE_init() returns B<SRP_NO_ERROR> (0) on success and a positive value
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on failure.
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The error codes are B<SRP_ERR_OPEN_FILE> if the file could not be opened,
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B<SRP_ERR_VBASE_INCOMPLETE_FILE> if the file could not be parsed,
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B<SRP_ERR_MEMORY> on memory allocation failure and B<SRP_ERR_VBASE_BN_LIB>
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for invalid decoded parameter values.
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SRP_VBASE_add0_user() returns 1 on success and 0 on failure.
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=head1 SEE ALSO
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L<srp(1)>,
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L<SRP_create_verifier(3)>,
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L<SRP_user_pwd_new(3)>,
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L<SSL_CTX_set_srp_password(3)>
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=head1 HISTORY
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The SRP_VBASE_add0_user() function was added in OpenSSL 3.0.
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All other functions were added in OpenSSL 1.0.1.
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=head1 COPYRIGHT
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Copyright 2018 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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