26 lines
1.2 KiB
Diff
26 lines
1.2 KiB
Diff
diff -up man-pages-3.30/man5/passwd.5.pom man-pages-3.30/man5/passwd.5
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--- man-pages-3.30/man5/passwd.5.pom 2010-11-01 15:55:41.000000000 +0100
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+++ man-pages-3.30/man5/passwd.5 2010-11-05 09:33:57.000000000 +0100
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@@ -45,11 +45,20 @@ hardware was too slow to crack a well-ch
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basic assumption used to be that of a friendly user-community.
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These days many people run some version of the shadow password suite, where
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.I /etc/passwd
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-has asterisks (*) instead of encrypted passwords,
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+has "x" instead of encrypted passwords,
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and the encrypted passwords are in
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.IR /etc/shadow ,
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which is readable by the superuser only.
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.PP
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+If the encrypted password, whether in /etc/passwd or in /etc/shadow, is
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+an empty string, login is allowed without even asking for a password.
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+Note that this functionality may be intentionally disabled in applications,
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+or configurable (for example using the "nullok" or "nonull" arguments to
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+pam_unix.so).
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+.PP
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+If the encrypted password in /etc/passwd is "*NP*" (without the quotes),
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+the shadow record should be obtained from a NIS+ server.
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+.PP
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Regardless of whether shadow passwords are used, many system administrators
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use an asterisk in the encrypted password field to make sure
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that this user can not authenticate him- or herself using a
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