9 SRP_VBASE_get1_by_user,
11 - Functions to create and manage a stack of SRP user verifier information
15 #include <openssl/srp.h>
17 SRP_VBASE *SRP_VBASE_new(char *seed_key);
18 void SRP_VBASE_free(SRP_VBASE *vb);
20 int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);
22 int SRP_VBASE_add0_user(SRP_VBASE *vb, SRP_user_pwd *user_pwd);
23 SRP_user_pwd *SRP_VBASE_get1_by_user(SRP_VBASE *vb, char *username);
24 SRP_user_pwd *SRP_VBASE_get_by_user(SRP_VBASE *vb, char *username);
28 The SRP_VBASE_new() function allocates a structure to store server side SRP
30 If B<seed_key> is not NULL a copy is stored and used to generate dummy parameters
31 for users that are not found by SRP_VBASE_get1_by_user(). This allows the server
32 to hide the fact that it doesn't have a verifier for a particular username,
33 as described in section 2.5.1.3 'Unknown SRP' of RFC 5054.
34 The seed string should contain random NUL terminated binary data (therefore
35 the random data should not contain NUL bytes!).
37 The SRP_VBASE_free() function frees up the B<vb> structure.
38 If B<vb> is NULL, nothing is done.
40 The SRP_VBASE_init() function parses the information in a verifier file and
41 populates the B<vb> structure.
42 The verifier file is a text file containing multiple entries, whose format is:
43 flag base64(verifier) base64(salt) username gNid userinfo(optional)
44 where the flag can be 'V' (valid) or 'R' (revoked).
45 Note that the base64 encoding used here is non-standard so it is recommended
46 to use L<srp(1)> to generate this file.
48 The SRP_VBASE_add0_user() function adds the B<user_pwd> verifier information
49 to the B<vb> structure. See L<SRP_user_pwd_new(3)> to create and populate this
51 The library takes ownership of B<user_pwd>, it should not be freed by the caller.
53 The SRP_VBASE_get1_by_user() function returns the password info for the user
54 whose username matches B<username>. It replaces the deprecated
55 SRP_VBASE_get_by_user().
56 If no matching user is found but a seed_key and default gN parameters have been
57 set, dummy authentication information is generated from the seed_key, allowing
58 the server to hide the fact that it doesn't have a verifier for a particular
59 username. When using SRP as a TLS authentication mechanism, this will cause
60 the handshake to proceed normally but the first client will be rejected with
61 a "bad_record_mac" alert, as if the password was incorrect.
62 If no matching user is found and the seed_key is not set, NULL is returned.
63 Ownership of the returned pointer is released to the caller, it must be freed
64 with SRP_user_pwd_free().
68 SRP_VBASE_init() returns B<SRP_NO_ERROR> (0) on success and a positive value
70 The error codes are B<SRP_ERR_OPEN_FILE> if the file could not be opened,
71 B<SRP_ERR_VBASE_INCOMPLETE_FILE> if the file could not be parsed,
72 B<SRP_ERR_MEMORY> on memory allocation failure and B<SRP_ERR_VBASE_BN_LIB>
73 for invalid decoded parameter values.
75 SRP_VBASE_add0_user() returns 1 on success and 0 on failure.
80 L<SRP_create_verifier(3)>,
81 L<SRP_user_pwd_new(3)>,
82 L<SSL_CTX_set_srp_password(3)>
86 The SRP_VBASE_add0_user() function was added in OpenSSL 3.0.
88 All other functions were added in OpenSSL 1.0.1.
92 Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
94 Licensed under the Apache License 2.0 (the "License"). You may not use
95 this file except in compliance with the License. You can obtain a copy
96 in the file LICENSE in the source distribution or at
97 L<https://www.openssl.org/source/license.html>.