configure.ac: Release 4.15.2

Signed-off-by: Alejandro Colomar <alx@kernel.org>

configure.ac

@@ -1,10 +1,10 @@
 dnl Process this file with autoconf to produce a configure script.
 AC_PREREQ([2.69])
-m4_define([libsubid_abi_major], 5)
+m4_define([libsubid_abi_major], 4)
 m4_define([libsubid_abi_minor], 0)
 m4_define([libsubid_abi_micro], 0)
 m4_define([libsubid_abi], [libsubid_abi_major.libsubid_abi_minor.libsubid_abi_micro])
-AC_INIT([shadow], [4.16.0], [pkg-shadow-devel@lists.alioth.debian.org], [],
+AC_INIT([shadow], [4.15.2], [pkg-shadow-devel@lists.alioth.debian.org], [],
 	[https://github.com/shadow-maint/shadow])
 AM_INIT_AUTOMAKE([1.11 foreign dist-xz subdir-objects tar-pax])
 AC_CONFIG_MACRO_DIRS([m4])
@@ -159,6 +159,13 @@ fi])
 AC_DEFINE_UNQUOTED(PASSWD_PROGRAM, "$shadow_cv_passwd_dir/passwd",
 	[Path to passwd program.])
 
+dnl XXX - quick hack, should disappear before anyone notices :).
+dnl XXX - I just read the above message :).
+if test "$ac_cv_func_ruserok" = "yes"; then
+	AC_DEFINE(RLOGIN, 1, [Define if login should support the -r flag for rlogind.])
+	AC_DEFINE(RUSEROK, 0, [Define to the ruserok() "success" return value (0 or 1).])
+fi
+
 AC_ARG_ENABLE(shadowgrp,
 	[AS_HELP_STRING([--enable-shadowgrp], [enable shadow group support @<:@default=yes@:>@])],
 	[case "${enableval}" in

lib/Makefile.am

@@ -119,6 +119,7 @@ libshadow_la_SOURCES = \
 	pwdcheck.c \
 	pwmem.c \
 	remove_tree.c \
+	rlogin.c \
 	root_flag.c \
 	run_part.h \
 	run_part.c \

lib/csrand.c

@@ -23,6 +23,7 @@
 #include "sizeof.h"
 
 
+static uint32_t csrand32(void);
 static uint32_t csrand_uniform32(uint32_t n);
 static unsigned long csrand_uniform_slow(unsigned long n);
 
@@ -97,6 +98,13 @@ csrand_interval(unsigned long min, unsigned long max)
 }
 
 
+static uint32_t
+csrand32(void)
+{
+	return csrand();
+}
+
+
 /*
  * Fast Random Integer Generation in an Interval
  * ACM Transactions on Modeling and Computer Simulation 29 (1), 2019
@@ -109,12 +117,12 @@ csrand_uniform32(uint32_t n)
 	uint64_t  r, mult;
 
 	if (n == 0)
-		return csrand();
+		return csrand32();
 
 	bound = -n % n;  // analogous to `2^32 % n`, since `x % y == (x-y) % y`
 
 	do {
-		r = csrand();
+		r = csrand32();
 		mult = r * n;
 		rem = mult;  // analogous to `mult % 2^32`
 	} while (rem < bound);  // p = (2^32 % n) / 2^32;  W.C.: n=2^31+1, p=0.5

lib/nss.c

@@ -131,11 +131,6 @@ void nss_init(const char *nsswitch_path) {
 		fprintf(shadow_logfd, "%s did not provide @find_subid_owners@\n", libname);
 		goto close_lib;
 	}
-	subid_nss->free = dlsym(h, "shadow_subid_free");
-	if (!subid_nss->free) {
-		fprintf(shadow_logfd, "%s did not provide @subid_free@\n", libname);
-		goto close_lib;
-	}
 	subid_nss->handle = h;
 	goto done;
 

lib/prototypes.h

@@ -284,19 +284,6 @@ struct subid_nss_ops {
 	 */
 	enum subid_status (*find_subid_owners)(unsigned long id, enum subid_type id_type, uid_t **uids, int *count);
 
-	/*
-	 * nss_free: free a memory block allocated by a subid plugin.
-	 *
-	 * @ptr - a pointer to a memory block to deallocate
-	 *
-	 * Some routines of subid_nss_ops allocate memory which should be freed by
-	 * caller after use. In order to deallocate that memory block, one should
-	 * use this routine to release that memory. By default, this function
-	 * pointer is set to free(3) for backward compatibility. However, it is
-	 * strongly recommended to define this routine explicitly.
-	 */
-	void (*free)(void *ptr);
-
 	/* The dlsym handle to close */
 	void *handle;
 };
@@ -369,6 +356,10 @@ unsigned long csrand_interval (unsigned long min, unsigned long max);
 /* remove_tree.c */
 extern int remove_tree (const char *root, bool remove_root);
 
+/* rlogin.c */
+extern int do_rlogin(const char *remote_host, char *name, size_t namesize,
+                     char *term, size_t termsize);
+
 /* root_flag.c */
 extern void process_root_flag (const char* short_opt, int argc, char **argv);
 

lib/rlogin.c

@@ -0,0 +1,135 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 1999, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2008, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifdef RLOGIN
+
+#ident "$Id$"
+
+#include "prototypes.h"
+#include "defines.h"
+#include <stdio.h>
+#include <pwd.h>
+#include <netdb.h>
+
+#include "atoi/str2i.h"
+
+
+static struct {
+	int spd_name;
+	int spd_baud;
+} speed_table[] =
+{
+	{ B50, 50},
+	{ B75, 75},
+	{ B110, 110},
+	{ B134, 134},
+	{ B150, 150},
+	{ B200, 200},
+	{ B300, 300},
+	{ B600, 600},
+	{ B1200, 1200},
+	{ B1800, 1800},
+	{ B2400, 2400},
+	{ B4800, 4800},
+	{ B9600, 9600},
+	{ B19200, 19200},
+	{ B38400, 38400},
+	{ -1, -1}
+};
+
+
+static void
+get_remote_string(char *buf, size_t size)
+{
+	for (;;) {
+		if (read (0, buf, 1) != 1) {
+			exit (EXIT_FAILURE);
+		}
+		if ('\0' == *buf) {
+			return;
+		}
+		--size;
+		if (size > 0) {
+			++buf;
+		}
+	}
+	/*NOTREACHED*/
+}
+
+
+int
+do_rlogin(const char *remote_host, char *name, size_t namesize, char *term,
+          size_t termsize)
+{
+	struct passwd *pwd;
+	char remote_name[32];
+	char *cp;
+	unsigned long remote_speed = 9600;
+	int speed_name = B9600;
+	int i;
+	TERMIO termio;
+
+	get_remote_string(remote_name, sizeof(remote_name));
+	get_remote_string(name, namesize);
+	get_remote_string(term, termsize);
+
+	cp = strchr (term, '/');
+	if (NULL != cp) {
+		*cp = '\0';
+		cp++;
+
+		if (str2ul(&remote_speed, cp) == -1)
+			remote_speed = 9600;
+	}
+	for (i = 0;
+	     (   (speed_table[i].spd_baud != remote_speed)
+	      && (speed_table[i].spd_name != -1));
+	     i++);
+
+	if (-1 != speed_table[i].spd_name) {
+		speed_name = speed_table[i].spd_name;
+	}
+
+	/*
+	 * Put the terminal in cooked mode with echo turned on.
+	 */
+
+	GTTY (0, &termio);
+	termio.c_iflag |= ICRNL | IXON;
+	termio.c_oflag |= OPOST | ONLCR;
+	termio.c_lflag |= ICANON | ECHO | ECHOE;
+#ifdef CBAUD
+	termio.c_cflag = (termio.c_cflag & ~CBAUD) | speed_name;
+#else
+	termio.c_cflag = (termio.c_cflag) | speed_name;
+#endif
+	STTY (0, &termio);
+
+	pwd = getpwnam (name); /* local, no need for xgetpwnam */
+	if (NULL == pwd) {
+		return 0;
+	}
+
+	/*
+	 * ruserok() returns 0 for success on modern systems, and 1 on
+	 * older ones.  If you are having trouble with people logging
+	 * in without giving a required password, THIS is the culprit -
+	 * go fix the #define in config.h.
+	 */
+
+#ifndef	RUSEROK
+	return 0;
+#else
+	return ruserok (remote_host, pwd->pw_uid == 0,
+			remote_name, name) == RUSEROK;
+#endif
+}
+#endif				/* RLOGIN */

lib/subordinateio.c

@@ -1117,16 +1117,6 @@ bool release_subid_range(struct subordinate_range *range, enum subid_type id_typ
 	return ret;
 }
 
-void free_subid_pointer(void *ptr)
-{
-	struct subid_nss_ops *h = get_subid_nss_handle();
-	if (h) {
-		h->free(ptr);
-	} else {
-		free(ptr);
-	}
-}
-
 #else				/* !ENABLE_SUBIDS */
 extern int ISO_C_forbids_an_empty_translation_unit;
 #endif				/* !ENABLE_SUBIDS */

lib/subordinateio.h

@@ -43,9 +43,6 @@ extern int sub_gid_unlock (void);
 extern int sub_gid_add (const char *owner, gid_t start, unsigned long count);
 extern int sub_gid_remove (const char *owner, gid_t start, unsigned long count);
 extern uid_t sub_gid_find_free_range(gid_t min, gid_t max, unsigned long count);
-
-extern void free_subid_pointer(void *ptr);
-
 #endif				/* ENABLE_SUBIDS */
 
 #endif

libsubid/api.c

@@ -42,11 +42,6 @@ bool subid_init(const char *progname, FILE * logfd)
 	return true;
 }
 
-void subid_free(void *ptr)
-{
-	free_subid_pointer(ptr);
-}
-
 static
 int get_subid_ranges(const char *owner, enum subid_type id_type, struct subid_range **ranges)
 {

libsubid/subid.h.in

@@ -55,19 +55,6 @@ extern "C" {
  */
 bool subid_init(const char *progname, FILE *logfd);
 
-/*
- * subid_free: free memory allocated in any subid_* function
- *
- * @ptr: Pointer to a memory block to release.
- *
- * Some functions like @subid_get_uid_ranges allocate memory internally. As
- * soon as a result is no longer needed, it should be freed with this routine.
- * Initially, default function `free()` was used. Thus for backward
- * compatibility this function falls back to `free()` if a plugin does not
- * explicitly specify routine to free allocated memory.
- */
-void subid_free(void *ptr);
-
 /*
  * subid_get_uid_ranges: return a list of UID ranges for a user
  *

man/login.1.xml

@@ -215,6 +215,14 @@
 	  <para>Preserve environment.</para>
 	</listitem>
       </varlistentry>
+      <varlistentry>
+	<term>
+	  <option>-r</option>
+	</term>
+	<listitem>
+	  <para>Perform autologin protocol for rlogin.</para>
+	</listitem>
+      </varlistentry>
     </variablelist>
 
     <para>

po/POTFILES.in

@@ -53,6 +53,7 @@ lib/pwdcheck.c
 lib/pwio.c
 lib/pwmem.c
 lib/remove_tree.c
+lib/rlogin.c
 lib/root_flag.c
 lib/salt.c
 lib/selinux.c

src/getsubids.c

@@ -44,6 +44,6 @@ int main(int argc, char *argv[])
 		printf("%d: %s %lu %lu\n", i, owner,
 			ranges[i].start, ranges[i].count);
 	}
-	subid_free(ranges);
+	free(ranges);
 	return 0;
 }

src/login.c

@@ -85,6 +85,11 @@ static struct lastlog ll;
 static bool pflg = false;
 static bool fflg = false;
 
+#ifdef RLOGIN
+static bool rflg = false;
+#else				/* RLOGIN */
+#define rflg false
+#endif				/* !RLOGIN */
 static bool hflg = false;
 static bool preauth_flag = false;
 
@@ -129,6 +134,7 @@ static void exit_handler (int);
  * usage - print login command usage and exit
  *
  * login [ name ]
+ * login -r hostname	(for rlogind)
  * login -h hostname	(for telnetd, etc.)
  * login -f name	(for pre-authenticated login: datakit, xterm, etc.)
  */
@@ -139,6 +145,9 @@ static void usage (void)
 		exit (1);
 	}
 	fprintf (stderr, _("       %s [-p] [-h host] [-f name]\n"), Prog);
+#ifdef RLOGIN
+	fprintf (stderr, _("       %s [-p] -r host\n"), Prog);
+#endif				/* RLOGIN */
 	exit (1);
 }
 
@@ -262,7 +271,7 @@ static void process_flags (int argc, char *const *argv)
 	/*
 	 * Check the flags for proper form. Every argument starting with
 	 * "-" must be exactly two characters long. This closes all the
-	 * clever telnet, and getty holes.
+	 * clever rlogin, telnet, and getty holes.
 	 */
 	for (arg = 1; arg < argc; arg++) {
 		if (argv[arg][0] == '-' && strlen (argv[arg]) > 2) {
@@ -289,6 +298,13 @@ static void process_flags (int argc, char *const *argv)
 			hostname = optarg;
 			reason = PW_TELNET;
 			break;
+#ifdef	RLOGIN
+		case 'r':
+			rflg = true;
+			hostname = optarg;
+			reason = PW_RLOGIN;
+			break;
+#endif				/* RLOGIN */
 		case 'p':
 			pflg = true;
 			break;
@@ -297,11 +313,21 @@ static void process_flags (int argc, char *const *argv)
 		}
 	}
 
+#ifdef RLOGIN
+	/*
+	 * Neither -h nor -f should be combined with -r.
+	 */
+
+	if (rflg && (hflg || fflg)) {
+		usage ();
+	}
+#endif				/* RLOGIN */
+
 	/*
 	 * Allow authentication bypass only if real UID is zero.
 	 */
 
-	if ((fflg || hflg) && !amroot) {
+	if ((rflg || fflg || hflg) && !amroot) {
 		fprintf (stderr, _("%s: Permission denied.\n"), Prog);
 		exit (1);
 	}
@@ -316,6 +342,11 @@ static void process_flags (int argc, char *const *argv)
 		++optind;
 	}
 
+#ifdef	RLOGIN
+	if (rflg && (NULL != username)) {
+		usage ();
+	}
+#endif				/* RLOGIN */
 	if (fflg && (NULL == username)) {
 		usage ();
 	}
@@ -443,6 +474,7 @@ static /*@observer@*/const char *get_failent_user (/*@returned@*/const char *use
  *	the flags which login supports are
  *
  *	-p - preserve the environment
+ *	-r - perform autologin protocol for rlogin
  *	-f - do not perform authentication, user is preauthenticated
  *	-h - the name of the remote host
  */
@@ -473,6 +505,9 @@ int main (int argc, char **argv)
 # if defined(ENABLE_LASTLOG)
 	char           ptime[80];
 # endif
+#endif
+#if defined(RLOGIN)
+	char           term[128] = "";
 #endif
 
 	/*
@@ -524,7 +559,7 @@ int main (int argc, char **argv)
 	is_console = console (tty);
 #endif
 
-	if (hflg) {
+	if (rflg || hflg) {
 		/*
 		 * Add remote hostname to the environment. I think
 		 * (not sure) I saw it once on Irix.  --marekm
@@ -537,6 +572,23 @@ int main (int argc, char **argv)
 	if (hflg) {
 		reason = PW_RLOGIN;
 	}
+#ifdef RLOGIN
+	if (rflg) {
+		size_t  max_size;
+
+		max_size = login_name_max_size();
+		assert (NULL == username);
+		username = XMALLOC(max_size, char);
+		username[max_size - 1] = '\0';
+		if (do_rlogin(hostname, username, max_size, term, sizeof(term)))
+		{
+			preauth_flag = true;
+		} else {
+			free (username);
+			username = NULL;
+		}
+	}
+#endif				/* RLOGIN */
 
 	OPENLOG (Prog);
 
@@ -571,11 +623,18 @@ int main (int argc, char **argv)
 		}
 	}
 
-	/* preserve TERM from getty */
-	if (!pflg) {
-		tmp = getenv ("TERM");
-		if (NULL != tmp) {
-			addenv ("TERM", tmp);
+#ifdef RLOGIN
+	if (term[0] != '\0') {
+		addenv ("TERM", term);
+	} else
+#endif				/* RLOGIN */
+	{
+		/* preserve TERM from getty */
+		if (!pflg) {
+			tmp = getenv ("TERM");
+			if (NULL != tmp) {
+				addenv ("TERM", tmp);
+			}
 		}
 	}
 
@@ -585,7 +644,7 @@ int main (int argc, char **argv)
 		set_env (argc - optind, &argv[optind]);
 	}
 
-	if (hflg) {
+	if (rflg || hflg) {
 		cp = hostname;
 	} else if ((host != NULL) && (host[0] != '\0')) {
 		cp = host;
@@ -895,7 +954,7 @@ int main (int argc, char **argv)
 		}
 
 		/*
-		 * The -f flag provides a name which has already
+		 * The -r and -f flags provide a name which has already
 		 * been authenticated by some server.
 		 */
 		if (preauth_flag) {
@@ -984,8 +1043,8 @@ int main (int argc, char **argv)
 
 		(void) puts (_("Login incorrect"));
 
-		/* allow only one attempt with -f */
-		if (fflg || (retries <= 0)) {
+		/* allow only one attempt with -r or -f */
+		if (rflg || fflg || (retries <= 0)) {
 			closelog ();
 			exit (1);
 		}

tests/bug332198-test.exp

@@ -0,0 +1,61 @@
+#!/usr/bin/expect -f
+
+# This is a script for repeatedly logging into the localhost
+# using `rlogin` in order to apparently see a symptoms described
+# in bug #332198.
+# As described in the bug log, sometimes `rlogind` will fail to
+# establish a connection, because it starts "login" process and
+# the latter fails with "unable to determine TTY name, got /dev/pts/1"
+# message.
+# 
+# BUGS
+# 
+# * the script rlogins to localhost
+# * the script doesn't handle passwdord prompt, because it's intended
+#   to use .rhosts auth and expects shell prompt immediately after
+#   `rlogin`
+# * the regexp for shell prompt is hardcoded
+
+log_user 0
+match_max 8192
+
+while {1} {
+    set rlogin_spawn [spawn rlogin localhost]
+    if { $rlogin_spawn == 0 } { exit 1 }
+    expect {
+	-timeout 10 -re "^.*(Last login\[^\r\n\]*).*\n(\[^\r\n\]*\[#$\] )$" {
+	    send_error "$expect_out(1,string)\n"
+	    send_error "$expect_out(2,string)\n"
+#	    send_error "$expect_out(0,string)\n"
+	}
+	timeout {
+	    send_error "TIMEOUT/prompt\n"
+	    send_error "$expect_out(buffer)\n"
+	    send_error "RETRYING\n"
+	    log_user 1
+	    send "tty /\r"
+	    expect -timeout 2 -re "^.*\r?\n(\[^\r\n\]*# )$" {}
+	    send "tty /\r"
+	    expect -timeout 2 -re "^.*\r?\n(\[^\r\n\]*# )$" {}
+	    send_error "\n"
+	    exit 2
+	}
+    }
+    send "tty\r"
+    expect {
+	-timeout 4 -re "tty\r?\n(\[^\r\n\]*)\r?\n(\[^\r\n\]*\[#$\] )$" {
+	    send_error "$expect_out(2,string)$expect_out(1,string)\n"
+#	    send_error "$expect_out(0,string)\n"
+	}
+	timeout { send_error "TIMEOUT/tty\n" ; exit 3 }
+    }
+    send "exit\r"
+    expect {
+	-timeout 2 eof {
+#	    send_error "OK4: EOF\n"
+	}
+	timeout { send_error "TIMEOUT/eof\n" ; exit 4 }
+    }
+    wait
+}
+# vi: set sw=4:

tests/libsubid/04_nss/libsubid_zzz.c

@@ -138,8 +138,3 @@ enum subid_status shadow_subid_list_owner_ranges(const char *owner, enum subid_t
 
 	return SUBID_STATUS_SUCCESS;
 }
-
-void shadow_subid_free(void *ptr)
-{
-	free(ptr);
-}