20 lines
991 B
Diff
20 lines
991 B
Diff
diff -up man-pages-3.40/man5/passwd.5.orig man-pages-3.40/man5/passwd.5
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--- man-pages-3.40/man5/passwd.5.orig 2012-04-27 00:58:39.000000000 +0200
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+++ man-pages-3.40/man5/passwd.5 2012-04-27 14:03:10.113106253 +0200
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@@ -50,6 +50,15 @@ 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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