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b0467ce764
freebsd-ports/security/openssh/files/patch-an
Brian Feldman 50cae6391f Fix a coredump-y bug that crept in recently.
2000-02-25 05:35:33 +00:00

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--- sshd.c.orig Fri Jan 7 01:32:03 2000
+++ sshd.c Fri Jan 7 01:40:05 2000
@@ -26,6 +26,8 @@
#include "servconf.h"
#include "uidswap.h"
#include "compat.h"
+#include <poll.h>
+#include <time.h>
#ifdef LIBWRAP
#include <tcpd.h>
@@ -34,6 +36,16 @@
int deny_severity = LOG_WARNING;
#endif /* LIBWRAP */
+#ifdef __FreeBSD__
+#include <libutil.h>
+#include <syslog.h>
+#define LOGIN_CAP
+#endif /* __FreeBSD__ */
+
+#ifdef LOGIN_CAP
+#include <login_cap.h>
+#endif /* LOGIN_CAP */
+
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
@@ -128,6 +140,32 @@
the private key. */
RSA *public_key;
+/* These are used to implement connections_per_period. */
+struct magic_connection {
+ struct timeval connections_begin;
+ unsigned int connections_this_period;
+} *magic_connections;
+/* Magic number, too! TODO: this doesn't have to be static. */
+const size_t MAGIC_CONNECTIONS_SIZE = 1;
+
+static __inline int
+magic_hash(struct sockaddr_storage *sa) {
+
+ return 0;
+}
+
+static __inline struct timeval
+timevaldiff(struct timeval *tv1, struct timeval *tv2) {
+ struct timeval diff;
+ int carry;
+
+ carry = tv1->tv_usec > tv2->tv_usec;
+ diff.tv_sec = tv2->tv_sec - tv1->tv_sec - (carry ? 0 : 1);
+ diff.tv_usec = tv2->tv_usec - tv1->tv_usec + (carry ? 1000000 : 0);
+
+ return diff;
+}
+
/* Prototypes for various functions defined later in this file. */
void do_connection();
void do_authentication(char *user);
@@ -301,6 +339,7 @@
extern int optind;
int opt, sock_in = 0, sock_out = 0, newsock, i, fdsetsz, pid, on = 1;
socklen_t fromlen;
+ int connections_per_period_exceeded = 0;
int remote_major, remote_minor;
int silentrsa = 0;
fd_set *fdset;
@@ -620,6 +659,12 @@
fdsetsz = howmany(maxfd, NFDBITS) * sizeof(fd_mask);
fdset = (fd_set *)xmalloc(fdsetsz);
+ /* Initialize the magic_connections table. It's magical! */
+ magic_connections = calloc(MAGIC_CONNECTIONS_SIZE,
+ sizeof(struct magic_connection));
+ if (magic_connections == NULL)
+ fatal("calloc: %s", strerror(errno));
+
/*
* Stay listening for connections until the system crashes or
* the daemon is killed with a signal.
@@ -651,9 +696,31 @@
error("newsock del O_NONBLOCK: %s", strerror(errno));
continue;
}
+ if (options.connections_per_period != 0) {
+ struct timeval diff, connections_end;
+ struct magic_connection *mc;
+
+ (void)gettimeofday(&connections_end, NULL);
+ mc = &magic_connections[magic_hash(&from)];
+ diff = timevaldiff(&mc->connections_begin, &connections_end);
+ if (diff.tv_sec >= options.connections_period) {
+ /*
+ * Slide the window forward only after completely
+ * leaving it.
+ */
+ mc->connections_begin = connections_end;
+ mc->connections_this_period = 1;
+ } else {
+ if (++mc->connections_this_period >
+ options.connections_per_period)
+ connections_per_period_exceeded = 1;
+ }
+ }
+
/*
- * Got connection. Fork a child to handle it, unless
- * we are in debugging mode.
+ * Got connection. Fork a child to handle it unless
+ * we are in debugging mode or the maximum number of
+ * connections per period has been exceeded.
*/
if (debug_flag) {
/*
@@ -667,6 +734,12 @@
sock_out = newsock;
pid = getpid();
break;
+ } else if (connections_per_period_exceeded) {
+ log("Connection rate limit of %u/%us has been exceeded; "
+ "dropping connection from %s.",
+ options.connections_per_period, options.connections_period,
+ ntop);
+ connections_per_period_exceeded = 0;
} else {
/*
* Normal production daemon. Fork, and have
@@ -1152,6 +1225,14 @@
return 0;
}
}
+ /* Fail if the account's expiration time has passed. */
+ if (pw->pw_expire != 0) {
+ struct timeval tv;
+
+ (void)gettimeofday(&tv, NULL);
+ if (tv.tv_sec >= pw->pw_expire)
+ return 0;
+ }
/* We found no reason not to let this user try to log on... */
return 1;
}
@@ -1187,6 +1268,9 @@
pwcopy.pw_gid = pw->pw_gid;
pwcopy.pw_dir = xstrdup(pw->pw_dir);
pwcopy.pw_shell = xstrdup(pw->pw_shell);
+ pwcopy.pw_class = xstrdup(pw->pw_class);
+ pwcopy.pw_expire = pw->pw_expire;
+ pwcopy.pw_change = pw->pw_change;
pw = &pwcopy;
/*
@@ -1983,6 +2067,10 @@
struct sockaddr_storage from;
socklen_t fromlen;
struct pty_cleanup_context cleanup_context;
+#ifdef LOGIN_CAP
+ login_cap_t *lc;
+ char *fname;
+#endif /* LOGIN_CAP */
/* Get remote host name. */
hostname = get_canonical_hostname();
@@ -2047,6 +2135,12 @@
/* Check if .hushlogin exists. */
snprintf(line, sizeof line, "%.200s/.hushlogin", pw->pw_dir);
quiet_login = stat(line, &st) >= 0;
+#ifdef LOGIN_CAP
+ lc = login_getpwclass(pw);
+ if (lc == NULL)
+ lc = login_getclassbyname(NULL, pw);
+ quiet_login = login_getcapbool(lc, "hushlogin", quiet_login);
+#endif /* LOGIN_CAP */
/*
* If the user has logged in before, display the time of last
@@ -2070,6 +2164,20 @@
else
printf("Last login: %s from %s\r\n", time_string, buf);
}
+#ifdef LOGIN_CAP
+ if (command == NULL && !quiet_login && !options.use_login) {
+ fname = login_getcapstr(lc, "copyright", NULL, NULL);
+ if (fname != NULL && (f = fopen(fname, "r")) != NULL) {
+ while (fgets(line, sizeof(line), f) != NULL)
+ fputs(line, stdout);
+ fclose(f);
+ } else
+ (void)printf("%s\n\t%s %s\n",
+ "Copyright (c) 1980, 1983, 1986, 1988, 1990, 1991, 1993, 1994",
+ "The Regents of the University of California. ",
+ "All rights reserved.");
+ }
+#endif /* LOGIN_CAP */
/*
* Print /etc/motd unless a command was specified or printing
* it was disabled in server options or login(1) will be
@@ -2078,14 +2186,22 @@
*/
if (command == NULL && options.print_motd && !quiet_login &&
!options.use_login) {
- /* Print /etc/motd if it exists. */
+#ifdef LOGIN_CAP
+ fname = login_getcapstr(lc, "welcome", NULL, NULL);
+ login_close(lc);
+ if (fname == NULL || (f = fopen(fname, "r")) == NULL)
+ f = fopen("/etc/motd", "r");
+#else /* LOGIN_CAP */
f = fopen("/etc/motd", "r");
+#endif /* LOGIN_CAP */
+ /* Print /etc/motd if it exists. */
if (f) {
while (fgets(line, sizeof(line), f))
fputs(line, stdout);
fclose(f);
}
}
+
/* Do common processing for the child, such as execing the command. */
do_child(command, pw, term, display, auth_proto, auth_data, ttyname);
/* NOTREACHED */
@@ -2221,7 +2337,8 @@
const char *display, const char *auth_proto,
const char *auth_data, const char *ttyname)
{
- const char *shell, *cp = NULL;
+ char *shell;
+ const char *cp = NULL;
char buf[256];
FILE *f;
unsigned int envsize, i;
@@ -2229,15 +2346,34 @@
extern char **environ;
struct stat st;
char *argv[10];
+#ifdef LOGIN_CAP
+ login_cap_t *lc;
+
+ lc = login_getpwclass(pw);
+ if (lc == NULL)
+ lc = login_getclassbyname(NULL, pw);
+#endif /* LOGIN_CAP */
f = fopen("/etc/nologin", "r");
+#ifdef __FreeBSD__
+ if (f == NULL)
+ f = fopen("/var/run/nologin", "r");
+#endif /* __FreeBSD__ */
if (f) {
/* /etc/nologin exists. Print its contents and exit. */
- while (fgets(buf, sizeof(buf), f))
- fputs(buf, stderr);
- fclose(f);
- if (pw->pw_uid != 0)
- exit(254);
+#ifdef LOGIN_CAP
+ /* On FreeBSD, etc., allow overriding nologin via login.conf. */
+ if (!login_getcapbool(lc, "ignorenologin", 0)) {
+#else /* LOGIN_CAP */
+ if (1) {
+#endif /* LOGIN_CAP */
+ while (fgets(buf, sizeof(buf), f))
+ fputs(buf, stderr);
+ fclose(f);
+ if (pw->pw_uid != 0)
+ exit(254);
+ }
+
}
/* Set login name in the kernel. */
if (setlogin(pw->pw_name) < 0)
@@ -2247,6 +2383,13 @@
/* Login(1) does this as well, and it needs uid 0 for the "-h"
switch, so we let login(1) to this for us. */
if (!options.use_login) {
+#ifdef LOGIN_CAP
+ if (setclasscontext(pw->pw_class, LOGIN_SETPRIORITY |
+ LOGIN_SETRESOURCES | LOGIN_SETUMASK) == -1) {
+ perror("setclasscontext");
+ exit(1);
+ }
+#endif /* LOGIN_CAP */
if (getuid() == 0 || geteuid() == 0) {
if (setgid(pw->pw_gid) < 0) {
perror("setgid");
@@ -2269,7 +2412,14 @@
* Get the shell from the password data. An empty shell field is
* legal, and means /bin/sh.
*/
+#ifdef LOGIN_CAP
+ shell = pw->pw_shell;
+ shell = login_getcapstr(lc, "shell", shell, shell);
+ if (shell[0] == '\0')
+ shell = _PATH_BSHELL;
+#else /* LOGIN_CAP */
shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
+#endif /* LOGIN_CAP */
#ifdef AFS
/* Try to get AFS tokens for the local cell. */
@@ -2293,7 +2443,12 @@
child_set_env(&env, &envsize, "USER", pw->pw_name);
child_set_env(&env, &envsize, "LOGNAME", pw->pw_name);
child_set_env(&env, &envsize, "HOME", pw->pw_dir);
+#ifdef LOGIN_CAP
+ child_set_env(&env, &envsize, "PATH",
+ login_getpath(lc, "path", _PATH_STDPATH));
+#else /* LOGIN_CAP */
child_set_env(&env, &envsize, "PATH", _PATH_STDPATH);
+#endif /* LOGIN_CAP */
snprintf(buf, sizeof buf, "%.200s/%.50s",
_PATH_MAILDIR, pw->pw_name);
@@ -2383,13 +2538,17 @@
*/
endpwent();
+#ifdef LOGIN_CAP
+ login_close(lc);
+#endif /* LOGIN_CAP */
+
/*
* Close any extra open file descriptors so that we don\'t have them
* hanging around in clients. Note that we want to do this after
* initgroups, because at least on Solaris 2.3 it leaves file
* descriptors open.
*/
- for (i = 3; i < 64; i++)
+ for (i = 3; i < getdtablesize(); i++)
close(i);
/* Change current directory to the user\'s home directory. */
@@ -2408,6 +2567,26 @@
* in this order).
*/
if (!options.use_login) {
+#ifdef __FreeBSD__
+ /*
+ * If the password change time is set and has passed, give the
+ * user a password expiry notice and chance to change it.
+ */
+ if (pw->pw_change != 0) {
+ struct timeval tv;
+
+ (void)gettimeofday(&tv, NULL);
+ if (tv.tv_sec >= pw->pw_change) {
+ (void)printf(
+ "Sorry -- your password has expired.\n");
+ syslog(LOG_INFO,
+ "%s Password expired - forcing change",
+ pw->pw_name);
+ if (system("/usr/bin/passwd") != 0)
+ perror("/usr/bin/passwd");
+ }
+ }
+#endif /* __FreeBSD__ */
if (stat(SSH_USER_RC, &st) >= 0) {
if (debug_flag)
fprintf(stderr, "Running /bin/sh %s\n", SSH_USER_RC);
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