File: 054_pam_security_abstract_securetty_handling

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Description: extract the securetty logic for use with the "nullok_secure" option
 introduced in the "055_pam_unix_nullok_secure" patch.

Index: pam.debian/modules/pam_securetty/pam_securetty.c
===================================================================
--- pam.debian.orig/modules/pam_securetty/pam_securetty.c
+++ pam.debian/modules/pam_securetty/pam_securetty.c
@@ -1,7 +1,5 @@
 /* pam_securetty module */
 
-#define SECURETTY_FILE "/etc/securetty"
-#define TTY_PREFIX     "/dev/"
 #define CMDLINE_FILE   "/proc/cmdline"
 #define CONSOLEACTIVE_FILE	"/sys/class/tty/console/active"
 
@@ -40,6 +38,9 @@
 #include <security/pam_modutil.h>
 #include <security/pam_ext.h>
 
+extern int _pammodutil_tty_secure(const pam_handle_t *pamh,
+                                  const char *uttyname);
+
 #define PAM_DEBUG_ARG       0x0001
 #define PAM_NOCONSOLE_ARG   0x0002
 
@@ -73,11 +74,7 @@
     const char *username;
     const char *uttyname;
     const void *void_uttyname;
-    char ttyfileline[256];
-    char ptname[256];
-    struct stat ttyfileinfo;
     struct passwd *user_pwd;
-    FILE *ttyfile;
 
     /* log a trail for debugging */
     if (ctrl & PAM_DEBUG_ARG) {
@@ -105,50 +102,7 @@
 	return PAM_SERVICE_ERR;
     }
 
-    /* The PAM_TTY item may be prefixed with "/dev/" - skip that */
-    if (strncmp(TTY_PREFIX, uttyname, sizeof(TTY_PREFIX)-1) == 0) {
-	uttyname += sizeof(TTY_PREFIX)-1;
-    }
-
-    if (stat(SECURETTY_FILE, &ttyfileinfo)) {
-	pam_syslog(pamh, LOG_NOTICE, "Couldn't open %s: %m", SECURETTY_FILE);
-	return PAM_SUCCESS; /* for compatibility with old securetty handling,
-			       this needs to succeed.  But we still log the
-			       error. */
-    }
-
-    if ((ttyfileinfo.st_mode & S_IWOTH) || !S_ISREG(ttyfileinfo.st_mode)) {
-	/* If the file is world writable or is not a
-	   normal file, return error */
-	pam_syslog(pamh, LOG_ERR,
-		   "%s is either world writable or not a normal file",
-		   SECURETTY_FILE);
-	return PAM_AUTH_ERR;
-    }
-
-    ttyfile = fopen(SECURETTY_FILE,"r");
-    if (ttyfile == NULL) { /* Check that we opened it successfully */
-	pam_syslog(pamh, LOG_ERR, "Error opening %s: %m", SECURETTY_FILE);
-	return PAM_SERVICE_ERR;
-    }
-
-    if (isdigit(uttyname[0])) {
-	snprintf(ptname, sizeof(ptname), "pts/%s", uttyname);
-    } else {
-	ptname[0] = '\0';
-    }
-
-    retval = 1;
-
-    while ((fgets(ttyfileline, sizeof(ttyfileline)-1, ttyfile) != NULL)
-	   && retval) {
-	if (ttyfileline[strlen(ttyfileline) - 1] == '\n')
-	    ttyfileline[strlen(ttyfileline) - 1] = '\0';
-
-	retval = ( strcmp(ttyfileline, uttyname)
-		   && (!ptname[0] || strcmp(ptname, uttyname)) );
-    }
-    fclose(ttyfile);
+    retval = _pammodutil_tty_secure(pamh, uttyname);
 
     if (retval && !(ctrl & PAM_NOCONSOLE_ARG)) {
         FILE *cmdlinefile;
Index: pam.debian/modules/pam_securetty/tty_secure.c
===================================================================
--- /dev/null
+++ pam.debian/modules/pam_securetty/tty_secure.c
@@ -0,0 +1,90 @@
+/*
+ * A function to determine if a particular line is in /etc/securetty
+ */
+
+
+#define SECURETTY_FILE "/etc/securetty"
+#define TTY_PREFIX     "/dev/"
+
+/* This function taken out of pam_securetty by Sam Hartman
+ * <hartmans@debian.org>*/
+/*
+ * by Elliot Lee <sopwith@redhat.com>, Red Hat Software.
+ * July 25, 1996.
+ * Slight modifications AGM. 1996/12/3
+ */
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <security/pam_modules.h>
+#include <stdarg.h>
+#include <syslog.h>
+#include <sys/syslog.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+extern int _pammodutil_tty_secure(const pam_handle_t *pamh,
+                                  const char *uttyname);
+
+int _pammodutil_tty_secure(const pam_handle_t *pamh, const char *uttyname)
+{
+    int retval = PAM_AUTH_ERR;
+    char ttyfileline[256];
+    char ptname[256];
+    struct stat ttyfileinfo;
+    FILE *ttyfile;
+    /* The PAM_TTY item may be prefixed with "/dev/" - skip that */
+    if (strncmp(TTY_PREFIX, uttyname, sizeof(TTY_PREFIX)-1) == 0)
+	uttyname += sizeof(TTY_PREFIX)-1;
+
+    if (stat(SECURETTY_FILE, &ttyfileinfo)) {
+	pam_syslog(pamh, LOG_NOTICE, "Couldn't open %s: %m",
+	           SECURETTY_FILE);
+	return PAM_SUCCESS; /* for compatibility with old securetty handling,
+			       this needs to succeed.  But we still log the
+			       error. */
+    }
+
+    if ((ttyfileinfo.st_mode & S_IWOTH) || !S_ISREG(ttyfileinfo.st_mode)) {
+	/* If the file is world writable or is not a
+	   normal file, return error */
+	pam_syslog(pamh, LOG_ERR,
+	           "%s is either world writable or not a normal file",
+	           SECURETTY_FILE);
+	return PAM_AUTH_ERR;
+    }
+
+    ttyfile = fopen(SECURETTY_FILE,"r");
+    if(ttyfile == NULL) { /* Check that we opened it successfully */
+	pam_syslog(pamh, LOG_ERR, "Error opening %s: %m", SECURETTY_FILE);
+	return PAM_SERVICE_ERR;
+    }
+
+    if (isdigit(uttyname[0])) {
+	snprintf(ptname, sizeof(ptname), "pts/%s", uttyname);
+    } else {
+	ptname[0] = '\0';
+    }
+
+    retval = 1;
+
+    while ((fgets(ttyfileline,sizeof(ttyfileline)-1, ttyfile) != NULL) 
+	   && retval) {
+	if(ttyfileline[strlen(ttyfileline) - 1] == '\n')
+	    ttyfileline[strlen(ttyfileline) - 1] = '\0';
+	retval = ( strcmp(ttyfileline,uttyname)
+	           && (!ptname[0] || strcmp(ptname, uttyname)) );
+    }
+    fclose(ttyfile);
+
+    if(retval) {
+	retval = PAM_AUTH_ERR;
+    }
+
+    return retval;
+}
Index: pam.debian/modules/pam_securetty/Makefile.am
===================================================================
--- pam.debian.orig/modules/pam_securetty/Makefile.am
+++ pam.debian/modules/pam_securetty/Makefile.am
@@ -24,6 +24,10 @@
 securelib_LTLIBRARIES = pam_securetty.la
 pam_securetty_la_LIBADD = -L$(top_builddir)/libpam -lpam
 
+pam_securetty_la_SOURCES =	\
+	pam_securetty.c		\
+	tty_secure.c
+
 if ENABLE_REGENERATE_MAN
 noinst_DATA = README
 README: pam_securetty.8.xml