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diff -up shadow-4.6/libmisc/chkname.c.goodname shadow-4.6/libmisc/chkname.c
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--- shadow-4.6/libmisc/chkname.c.goodname 2020-10-23 12:50:47.202529031 +0200
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+++ shadow-4.6/libmisc/chkname.c 2020-10-23 12:54:54.604692559 +0200
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@@ -49,25 +49,44 @@
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static bool is_valid_name (const char *name)
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{
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/*
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- * User/group names must match [a-z_][a-z0-9_-]*[$]
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- */
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- if (('\0' == *name) ||
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- !((('a' <= *name) && ('z' >= *name)) || ('_' == *name))) {
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+ * User/group names must match gnu e-regex:
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+ * [a-zA-Z0-9_.][a-zA-Z0-9_.-]{0,30}[a-zA-Z0-9_.$-]?
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+ *
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+ * as a non-POSIX, extension, allow "$" as the last char for
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+ * sake of Samba 3.x "add machine script"
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+ *
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+ * Also do not allow fully numeric names or just "." or "..".
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+ */
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+ int numeric;
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+
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+ if ('\0' == *name ||
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+ ('.' == *name && (('.' == name[1] && '\0' == name[2]) ||
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+ '\0' == name[1])) ||
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+ !((*name >= 'a' && *name <= 'z') ||
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+ (*name >= 'A' && *name <= 'Z') ||
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+ (*name >= '0' && *name <= '9') ||
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+ *name == '_' ||
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+ *name == '.')) {
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return false;
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}
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+ numeric = isdigit(*name);
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+
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while ('\0' != *++name) {
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- if (!(( ('a' <= *name) && ('z' >= *name) ) ||
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- ( ('0' <= *name) && ('9' >= *name) ) ||
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- ('_' == *name) ||
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- ('-' == *name) ||
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- ( ('$' == *name) && ('\0' == *(name + 1)) )
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+ if (!((*name >= 'a' && *name <= 'z') ||
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+ (*name >= 'A' && *name <= 'Z') ||
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+ (*name >= '0' && *name <= '9') ||
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+ *name == '_' ||
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+ *name == '.' ||
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+ *name == '-' ||
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+ (*name == '$' && name[1] == '\0')
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)) {
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return false;
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}
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+ numeric &= isdigit(*name);
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}
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- return true;
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+ return !numeric;
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}
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bool is_valid_user_name (const char *name)
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diff -up shadow-4.6/man/groupadd.8.xml.goodname shadow-4.6/man/groupadd.8.xml
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--- shadow-4.6/man/groupadd.8.xml.goodname 2018-04-29 18:42:37.000000000 +0200
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+++ shadow-4.6/man/groupadd.8.xml 2020-10-23 12:50:47.202529031 +0200
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@@ -273,10 +273,14 @@
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<refsect1 id='caveats'>
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<title>CAVEATS</title>
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<para>
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- Groupnames must start with a lower case letter or an underscore,
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- followed by lower case letters, digits, underscores, or dashes.
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- They can end with a dollar sign.
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- In regular expression terms: [a-z_][a-z0-9_-]*[$]?
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+ Groupnames may begin with lower and upper case letters, digits,
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+ underscores, or periods. They may continue with all the aforementioned
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+ characters, or dashes. Finally, they can end with a dollar sign.
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+
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+ Fully numeric groupnames and groupnames containing only . or .. are
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+ disallowed.
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+
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+ In regular expression terms: [a-zA-Z0-9_.][a-zA-Z0-9_.-]*[$]?
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</para>
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<para>
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Groupnames may only be up to &GROUP_NAME_MAX_LENGTH; characters long.
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diff -up shadow-4.6/man/useradd.8.xml.goodname shadow-4.6/man/useradd.8.xml
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--- shadow-4.6/man/useradd.8.xml.goodname 2018-04-29 18:42:37.000000000 +0200
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+++ shadow-4.6/man/useradd.8.xml 2020-10-23 12:50:47.202529031 +0200
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@@ -650,10 +650,16 @@
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</para>
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<para>
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- Usernames must start with a lower case letter or an underscore,
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- followed by lower case letters, digits, underscores, or dashes.
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- They can end with a dollar sign.
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- In regular expression terms: [a-z_][a-z0-9_-]*[$]?
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+ Usernames may begin with lower and upper case letters, digits,
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+ underscores, or periods. They may continue with all the aforementioned
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+ characters, or dashes. Finally, they can end with a dollar sign.
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+
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+ Fully numeric usernames and usernames containing only . or .. are
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+ disallowed. It is not recommended to use usernames beginning
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+ with . character as their home directories will be hidden in
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+ the <command>ls</command> output.
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+
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+ In regular expression terms: [a-zA-Z0-9_.][a-zA-Z0-9_.-]*[$]?
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</para>
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<para>
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Usernames may only be up to 32 characters long.
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