Compare commits
No commits in common. 'i9c-beta' and 'c9' have entirely different histories.
@ -0,0 +1,211 @@
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diff -up Linux-PAM-1.5.1/modules/pam_access/access.conf.5.xml.pam-access-resolve-ip Linux-PAM-1.5.1/modules/pam_access/access.conf.5.xml
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--- Linux-PAM-1.5.1/modules/pam_access/access.conf.5.xml.pam-access-resolve-ip 2020-11-25 17:57:02.000000000 +0100
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+++ Linux-PAM-1.5.1/modules/pam_access/access.conf.5.xml 2024-11-21 10:04:58.553127026 +0100
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@@ -226,6 +226,14 @@
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item and the line will be most probably ignored. For this reason, it is not
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recommended to put spaces around the ':' characters.
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</para>
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+ <para>
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+ An IPv6 link local host address must contain the interface
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+ identifier. IPv6 link local network/netmask is not supported.
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+ </para>
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+ <para>
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+ Hostnames should be written as Fully-Qualified Host Name (FQHN) to avoid
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+ confusion with device names or PAM service names.
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+ </para>
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</refsect1>
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<refsect1 id="access.conf-see_also">
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diff -up Linux-PAM-1.5.1/modules/pam_access/pam_access.8.xml.pam-access-resolve-ip Linux-PAM-1.5.1/modules/pam_access/pam_access.8.xml
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--- Linux-PAM-1.5.1/modules/pam_access/pam_access.8.xml.pam-access-resolve-ip 2020-11-25 17:57:02.000000000 +0100
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+++ Linux-PAM-1.5.1/modules/pam_access/pam_access.8.xml 2024-11-21 10:04:58.553127026 +0100
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@@ -25,11 +25,14 @@
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<arg choice="opt">
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debug
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</arg>
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+ <arg choice="opt" rep="norepeat">
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+ noaudit
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+ </arg>
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<arg choice="opt">
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nodefgroup
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</arg>
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- <arg choice="opt">
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- noaudit
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+ <arg choice="opt" rep="norepeat">
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+ nodns
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</arg>
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<arg choice="opt">
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accessfile=<replaceable>file</replaceable>
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@@ -114,7 +117,46 @@
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<varlistentry>
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<term>
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- <option>fieldsep=<replaceable>separators</replaceable></option>
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+ nodefgroup
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+ </term>
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+ <listitem>
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+ <para>
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+ User tokens which are not enclosed in parentheses will not be
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+ matched against the group database. The backwards compatible default is
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+ to try the group database match even for tokens not enclosed
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+ in parentheses.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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+
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+ <varlistentry>
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+ <term>
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+ nodns
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+ </term>
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+ <listitem>
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+ <para>
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+ Do not try to resolve tokens as hostnames, only IPv4 and IPv6
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+ addresses will be resolved. Which means to allow login from a
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+ remote host, the IP addresses need to be specified in <filename>access.conf</filename>.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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+
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+ <varlistentry>
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+ <term>
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+ quiet_log
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+ </term>
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+ <listitem>
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+ <para>
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+ Do not log denials with
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+ <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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+
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+ <varlistentry>
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+ <term>
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+ fieldsep=separators
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</term>
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<listitem>
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<para>
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@@ -152,20 +194,6 @@
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</para>
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</listitem>
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</varlistentry>
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-
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- <varlistentry>
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- <term>
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- <option>nodefgroup</option>
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- </term>
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- <listitem>
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- <para>
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- User tokens which are not enclosed in parentheses will not be
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- matched against the group database. The backwards compatible default is
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- to try the group database match even for tokens not enclosed
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- in parentheses.
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- </para>
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- </listitem>
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- </varlistentry>
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</variablelist>
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</refsect1>
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diff -up Linux-PAM-1.5.1/modules/pam_access/pam_access.c.pam-access-resolve-ip Linux-PAM-1.5.1/modules/pam_access/pam_access.c
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--- Linux-PAM-1.5.1/modules/pam_access/pam_access.c.pam-access-resolve-ip 2024-11-21 10:04:58.547127010 +0100
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+++ Linux-PAM-1.5.1/modules/pam_access/pam_access.c 2024-11-21 10:04:58.553127026 +0100
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@@ -92,6 +92,7 @@ struct login_info {
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int debug; /* Print debugging messages. */
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int only_new_group_syntax; /* Only allow group entries of the form "(xyz)" */
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int noaudit; /* Do not audit denials */
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+ int nodns; /* Do not try to resolve tokens as hostnames */
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const char *fs; /* field separator */
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const char *sep; /* list-element separator */
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int from_remote_host; /* If PAM_RHOST was used for from */
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@@ -143,6 +144,8 @@ parse_args(pam_handle_t *pamh, struct lo
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loginfo->only_new_group_syntax = YES;
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} else if (strcmp (argv[i], "noaudit") == 0) {
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loginfo->noaudit = YES;
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+ } else if (strcmp (argv[i], "nodns") == 0) {
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+ loginfo->nodns = YES;
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} else {
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pam_syslog(pamh, LOG_ERR, "unrecognized option [%s]", argv[i]);
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}
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@@ -700,6 +703,39 @@ string_match (pam_handle_t *pamh, const
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}
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+static int
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+is_device (pam_handle_t *pamh, const char *tok)
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+{
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+ struct stat st;
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+ const char *dev = "/dev/";
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+ char *devname;
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+
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+ devname = malloc (strlen(dev) + strlen (tok) + 1);
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+ if (devname == NULL) {
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+ pam_syslog(pamh, LOG_ERR, "Cannot allocate memory for device name: %m");
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+ /*
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+ * We should return an error and abort, but pam_access has no good
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+ * error handling.
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+ */
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+ return NO;
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+ }
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+
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+ char *cp = stpcpy (devname, dev);
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+ strcpy (cp, tok);
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+
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+ if (lstat(devname, &st) != 0)
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+ {
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+ free (devname);
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+ return NO;
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+ }
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+ free (devname);
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+
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+ if (S_ISCHR(st.st_mode))
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+ return YES;
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+
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+ return NO;
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+}
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+
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/* network_netmask_match - match a string against one token
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* where string is a hostname or ip (v4,v6) address and tok
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* represents either a hostname, a single ip (v4,v6) address
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@@ -761,10 +797,42 @@ network_netmask_match (pam_handle_t *pam
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return NO;
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}
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}
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+ else if (isipaddr(tok, NULL, NULL) == YES)
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+ {
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+ if (getaddrinfo (tok, NULL, NULL, &ai) != 0)
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+ {
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+ if (item->debug)
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+ pam_syslog(pamh, LOG_DEBUG, "cannot resolve IP address \"%s\"", tok);
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+
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+ return NO;
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+ }
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+ netmask_ptr = NULL;
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+ }
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+ else if (item->nodns)
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+ {
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+ /* Only hostnames are left, which we would need to resolve via DNS */
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+ return NO;
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+ }
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else
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{
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+ /* Bail out on X11 Display entries and ttys. */
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+ if (tok[0] == ':')
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+ {
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+ if (item->debug)
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+ pam_syslog (pamh, LOG_DEBUG,
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+ "network_netmask_match: tok=%s is X11 display", tok);
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+ return NO;
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+ }
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+ if (is_device (pamh, tok))
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+ {
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+ if (item->debug)
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+ pam_syslog (pamh, LOG_DEBUG,
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+ "network_netmask_match: tok=%s is a TTY", tok);
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+ return NO;
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+ }
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+
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/*
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- * It is either an IP address or a hostname.
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+ * It is most likely a hostname.
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* Let getaddrinfo sort everything out
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*/
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if (getaddrinfo (tok, NULL, NULL, &ai) != 0)
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@ -0,0 +1,114 @@
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diff -up Linux-PAM-1.5.1/modules/pam_unix/passverify.c.fail1 Linux-PAM-1.5.1/modules/pam_unix/passverify.c
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--- Linux-PAM-1.5.1/modules/pam_unix/passverify.c.fail1 2024-11-04 11:42:51.962791265 +0100
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+++ Linux-PAM-1.5.1/modules/pam_unix/passverify.c 2024-11-04 11:45:18.246218579 +0100
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@@ -239,17 +239,21 @@ PAMH_ARG_DECL(int get_account_info,
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return PAM_UNIX_RUN_HELPER;
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#endif
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} else if (is_pwd_shadowed(*pwd)) {
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+#ifdef HELPER_COMPILE
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/*
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- * ...and shadow password file entry for this user,
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+ * shadow password file entry for this user,
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* if shadowing is enabled
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*/
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-#ifndef HELPER_COMPILE
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- if (geteuid() || SELINUX_ENABLED)
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- return PAM_UNIX_RUN_HELPER;
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-#endif
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- *spwdent = pam_modutil_getspnam(pamh, name);
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+ *spwdent = getspnam(name);
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if (*spwdent == NULL || (*spwdent)->sp_pwdp == NULL)
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return PAM_AUTHINFO_UNAVAIL;
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+#else
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+ /*
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+ * The helper has to be invoked to deal with
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+ * the shadow password file entry.
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+ */
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+ return PAM_UNIX_RUN_HELPER;
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+#endif
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}
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} else {
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return PAM_USER_UNKNOWN;
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From 8d0c575336ad301cd14e16ad2fdec6fe621764b8 Mon Sep 17 00:00:00 2001
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From: Sergei Trofimovich <slyich@gmail.com>
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Date: Thu, 28 Mar 2024 21:58:35 +0000
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Subject: [PATCH] pam_unix: allow empty passwords with non-empty hashes
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Before the change pam_unix has different behaviours for a user with
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empty password for these two `/etc/shadow` entries:
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nulloktest:$6$Yy4ty2jJ$bsVQWo8qlXC6UHq1/qTC3UR60ZJKmKApJ3Wj7DreAy8FxlVKtlDnplFQ7jMLVlDqordE7e4t49GvTb.aI59TP0:1::::::
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nulloktest::1::::::
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The entry with a hash was rejected and the entry without was accepted.
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The rejection happened because 9e74e90147c "pam_unix: avoid determining
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if user exists" introduced the following rejection check (slightly
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simplified):
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...
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} else if (p[0] == '\0' && nullok) {
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if (hash[0] != '\0') {
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retval = PAM_AUTH_ERR;
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}
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We should not reject the user with a hash assuming it's non-empty.
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The change does that by pushing empty password check into
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`verify_pwd_hash()`.
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`NixOS` generates such hashed entries for empty passwords as if they
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were non-empty using the following perl code:
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sub hashPassword {
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my ($password) = @_;
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my $salt = "";
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my @chars = ('.', '/', 0..9, 'A'..'Z', 'a'..'z');
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$salt .= $chars[rand 64] for (1..8);
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return crypt($password, '$6$' . $salt . '$');
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}
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Resolves: https://github.com/linux-pam/linux-pam/issues/758
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Fixes: 9e74e90147c "pam_unix: avoid determining if user exists"
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Signed-off-by: Sergei Trofimovich <slyich@gmail.com>
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---
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modules/pam_unix/passverify.c | 14 ++++++--------
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1 file changed, 6 insertions(+), 8 deletions(-)
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diff --git a/modules/pam_unix/passverify.c b/modules/pam_unix/passverify.c
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index 30045333..1c83f1aa 100644
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--- a/modules/pam_unix/passverify.c
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+++ b/modules/pam_unix/passverify.c
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@@ -76,9 +76,13 @@ PAMH_ARG_DECL(int verify_pwd_hash,
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strip_hpux_aging(hash);
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hash_len = strlen(hash);
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- if (!hash_len) {
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+
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+ if (p && p[0] == '\0' && !nullok) {
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+ /* The passed password is empty */
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+ retval = PAM_AUTH_ERR;
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+ } else if (!hash_len) {
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/* the stored password is NULL */
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- if (nullok) { /* this means we've succeeded */
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+ if (p && p[0] == '\0' && nullok) { /* this means we've succeeded */
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D(("user has empty password - access granted"));
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retval = PAM_SUCCESS;
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} else {
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@@ -1109,12 +1113,6 @@ helper_verify_password(const char *name, const char *p, int nullok)
|
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if (pwd == NULL || hash == NULL) {
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helper_log_err(LOG_NOTICE, "check pass; user unknown");
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retval = PAM_USER_UNKNOWN;
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- } else if (p[0] == '\0' && nullok) {
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- if (hash[0] == '\0') {
|
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- retval = PAM_SUCCESS;
|
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- } else {
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- retval = PAM_AUTH_ERR;
|
||||
- }
|
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} else {
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retval = verify_pwd_hash(p, hash, nullok);
|
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}
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--
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||||
2.47.0
|
||||
|
||||
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Reference in new issue