222 lines
7.7 KiB
Groff
Executable File
222 lines
7.7 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "SRP_VBASE_NEW 3"
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.TH SRP_VBASE_NEW 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "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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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/srp.h>
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\&
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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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\&
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\& int SRP_VBASE_init(SRP_VBASE *vb, char *verifier_file);
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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fISRP_VBASE_new()\fR function allocates a structure to store server side \s-1SRP\s0
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verifier information.
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If \fBseed_key\fR is not \s-1NULL\s0 a copy is stored and used to generate dummy parameters
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for users that are not found by \fISRP_VBASE_get1_by_user()\fR. 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 \s-1SRP\s0' of \s-1RFC\s0 5054.
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The seed string should contain random \s-1NUL\s0 terminated binary data (therefore
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the random data should not contain \s-1NUL\s0 bytes!).
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.PP
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The \fISRP_VBASE_free()\fR function frees up the \fBvb\fR structure.
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If \fBvb\fR is \s-1NULL\s0, nothing is done.
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.PP
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The \fISRP_VBASE_init()\fR function parses the information in a verifier file and
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populates the \fBvb\fR 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 \fIopenssl\-srp\fR\|(1) to generate this file.
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.PP
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The \fISRP_VBASE_add0_user()\fR function adds the \fBuser_pwd\fR verifier information
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to the \fBvb\fR structure. See \fISRP_user_pwd_new\fR\|(3) to create and populate this
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record.
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The library takes ownership of \fBuser_pwd\fR, it should not be freed by the caller.
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.PP
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The \fISRP_VBASE_get1_by_user()\fR function returns the password info for the user
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whose username matches \fBusername\fR. It replaces the deprecated
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\&\fISRP_VBASE_get_by_user()\fR.
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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 \s-1SRP\s0 as a \s-1TLS\s0 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 \*(L"bad_record_mac\*(R" alert, as if the password was incorrect.
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If no matching user is found and the seed_key is not set, \s-1NULL\s0 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 \fISRP_user_pwd_free()\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fISRP_VBASE_init()\fR returns \fB\s-1SRP_NO_ERROR\s0\fR (0) on success and a positive value
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on failure.
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The error codes are \fB\s-1SRP_ERR_OPEN_FILE\s0\fR if the file could not be opened,
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\&\fB\s-1SRP_ERR_VBASE_INCOMPLETE_FILE\s0\fR if the file could not be parsed,
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\&\fB\s-1SRP_ERR_MEMORY\s0\fR on memory allocation failure and \fB\s-1SRP_ERR_VBASE_BN_LIB\s0\fR
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for invalid decoded parameter values.
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.PP
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\&\fISRP_VBASE_add0_user()\fR returns 1 on success and 0 on failure.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIopenssl\-srp\fR\|(1),
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\&\fISRP_create_verifier\fR\|(3),
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\&\fISRP_user_pwd_new\fR\|(3),
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\&\fISSL_CTX_set_srp_password\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fISRP_VBASE_add0_user()\fR function was added in OpenSSL 3.0.
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.PP
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All other functions were added in OpenSSL 1.0.1.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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