f93cf255d4
Closes #238 Update all files to list SPDX license shortname. Most files are BSD 3 clause license. The exceptions are: serge@sl ~/src/shadow$ git grep SPDX-License | grep -v BSD-3-Clause contrib/atudel:# SPDX-License-Identifier: BSD-4-Clause lib/tcbfuncs.c: * SPDX-License-Identifier: 0BSD libmisc/salt.c: * SPDX-License-Identifier: Unlicense src/login_nopam.c: * SPDX-License-Identifier: Unlicense src/nologin.c: * SPDX-License-Identifier: BSD-2-Clause src/vipw.c: * SPDX-License-Identifier: GPL-2.0-or-later Signed-off-by: Serge Hallyn <serge@hallyn.com>
46 lines
1.7 KiB
XML
46 lines
1.7 KiB
XML
<!--
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SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
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SPDX-License-Identifier: BSD-3-Clause
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-->
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<varlistentry condition="sha_crypt">
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<term><option>SHA_CRYPT_MIN_ROUNDS</option> (number)</term>
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<term><option>SHA_CRYPT_MAX_ROUNDS</option> (number)</term>
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<listitem>
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<para>
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When <option>ENCRYPT_METHOD</option> is set to
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<replaceable>SHA256</replaceable> or
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<replaceable>SHA512</replaceable>, this defines the number of SHA
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rounds used by the encryption algorithm by default (when the number
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of rounds is not specified on the command line).
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</para>
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<para>
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With a lot of rounds, it is more difficult to brute forcing the
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password. But note also that more CPU resources will be needed to
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authenticate users.
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</para>
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<para>
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If not specified, the libc will choose the default number of rounds
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(5000), which is orders of magnitude too low for modern hardware.
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</para>
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<para>
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The values must be inside the 1000-999,999,999 range.
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</para>
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<para>
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If only one of the <option>SHA_CRYPT_MIN_ROUNDS</option> or
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<option>SHA_CRYPT_MAX_ROUNDS</option> values is set, then this value
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will be used.
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</para>
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<para>
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If <option>SHA_CRYPT_MIN_ROUNDS</option> >
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<option>SHA_CRYPT_MAX_ROUNDS</option>, the highest value will be
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used.
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</para>
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<para condition="pam">
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Note: This only affect the generation of group passwords.
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The generation of user passwords is done by PAM and subject to the
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PAM configuration. It is recommended to set this variable
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consistently with the PAM configuration.
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</para>
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</listitem>
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</varlistentry>
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