import openssh-8.7p1-8.el9

This commit is contained in:
CentOS Sources 2022-05-17 06:26:26 -04:00 committed by Stepan Oksanichenko
commit 8a611fa9e0
71 changed files with 21875 additions and 0 deletions

3
.gitignore vendored Normal file
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@ -0,0 +1,3 @@
SOURCES/gpgkey-736060BA.gpg
SOURCES/openssh-8.7p1.tar.gz
SOURCES/pam_ssh_agent_auth-0.10.4.tar.gz

3
.openssh.metadata Normal file
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@ -0,0 +1,3 @@
dbb35b4e9ae3f72b930a82c6fd5e83e9dcd7b193 SOURCES/gpgkey-736060BA.gpg
8719032c1e47732c8fdb14adfb24b5e9e71de802 SOURCES/openssh-8.7p1.tar.gz
66dd8274346fd006ff40f525c082cfb701085b5f SOURCES/pam_ssh_agent_auth-0.10.4.tar.gz

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@ -0,0 +1,18 @@
diff -up openssh-8.6p1/contrib/gnome-ssh-askpass2.c.grab-info openssh-8.6p1/contrib/gnome-ssh-askpass2.c
--- openssh-8.6p1/contrib/gnome-ssh-askpass2.c.grab-info 2021-04-19 13:57:11.720113536 +0200
+++ openssh-8.6p1/contrib/gnome-ssh-askpass2.c 2021-04-19 13:59:29.842163204 +0200
@@ -70,8 +70,12 @@ report_failed_grab (GtkWidget *parent_wi
err = gtk_message_dialog_new(GTK_WINDOW(parent_window), 0,
GTK_MESSAGE_ERROR, GTK_BUTTONS_CLOSE,
- "Could not grab %s. A malicious client may be eavesdropping "
- "on your session.", what);
+ "SSH password dialog could not grab the %s input.\n"
+ "This might be caused by application such as screensaver, "
+ "however it could also mean that someone may be eavesdropping "
+ "on your session.\n"
+ "Either close the application which grabs the %s or "
+ "log out and log in again to prevent this from happening.", what, what);
gtk_window_set_position(GTK_WINDOW(err), GTK_WIN_POS_CENTER);
gtk_dialog_run(GTK_DIALOG(err));

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@ -0,0 +1,83 @@
diff -up openssh-7.4p1/contrib/gnome-ssh-askpass2.c.progress openssh-7.4p1/contrib/gnome-ssh-askpass2.c
--- openssh-7.4p1/contrib/gnome-ssh-askpass2.c.progress 2016-12-19 05:59:41.000000000 +0100
+++ openssh-7.4p1/contrib/gnome-ssh-askpass2.c 2016-12-23 13:31:16.545211926 +0100
@@ -53,6 +53,7 @@
#include <unistd.h>
#include <X11/Xlib.h>
+#include <glib.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include <gdk/gdkkeysyms.h>
@@ -81,14 +82,25 @@ ok_dialog(GtkWidget *entry, gpointer dia
return 1;
}
+static void
+move_progress(GtkWidget *entry, gpointer progress)
+{
+ gdouble step;
+ g_return_if_fail(GTK_IS_PROGRESS_BAR(progress));
+
+ step = g_random_double_range(0.03, 0.1);
+ gtk_progress_bar_set_pulse_step(GTK_PROGRESS_BAR(progress), step);
+ gtk_progress_bar_pulse(GTK_PROGRESS_BAR(progress));
+}
+
static int
passphrase_dialog(char *message, int prompt_type)
{
const char *failed;
char *passphrase, *local;
int result, grab_tries, grab_server, grab_pointer;
int buttons, default_response;
- GtkWidget *parent_window, *dialog, *entry;
+ GtkWidget *parent_window, *dialog, *entry, *progress, *hbox;
GdkGrabStatus status;
GdkColor fg, bg;
int fg_set = 0, bg_set = 0;
@@ -104,14 +116,19 @@ passphrase_dialog(char *message)
gtk_widget_modify_bg(dialog, GTK_STATE_NORMAL, &bg);
if (prompt_type == PROMPT_ENTRY || prompt_type == PROMPT_NONE) {
+ hbox = gtk_hbox_new(FALSE, 0);
+ gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox), hbox, FALSE,
+ FALSE, 0);
+ gtk_widget_show(hbox);
+
entry = gtk_entry_new();
if (fg_set)
gtk_widget_modify_fg(entry, GTK_STATE_NORMAL, &fg);
if (bg_set)
gtk_widget_modify_bg(entry, GTK_STATE_NORMAL, &bg);
gtk_box_pack_start(
- GTK_BOX(gtk_dialog_get_content_area(GTK_DIALOG(dialog))),
- entry, FALSE, FALSE, 0);
+ GTK_BOX(hbox), entry, TRUE, FALSE, 0);
+ gtk_entry_set_width_chars(GTK_ENTRY(entry), 2);
gtk_entry_set_visibility(GTK_ENTRY(entry), FALSE);
gtk_widget_grab_focus(entry);
if (prompt_type == PROMPT_ENTRY) {
@@ -130,6 +145,22 @@ passphrase_dialog(char *message)
g_signal_connect(G_OBJECT(entry), "key_press_event",
G_CALLBACK(check_none), dialog);
}
+
+ hbox = gtk_hbox_new(FALSE, 0);
+ gtk_box_pack_start(GTK_BOX(GTK_DIALOG(dialog)->vbox),
+ hbox, FALSE, FALSE, 8);
+ gtk_widget_show(hbox);
+
+ progress = gtk_progress_bar_new();
+
+ gtk_progress_bar_set_text(GTK_PROGRESS_BAR(progress),
+ "Passphrase length hidden intentionally");
+ gtk_box_pack_start(GTK_BOX(hbox), progress, TRUE,
+ TRUE, 5);
+ gtk_widget_show(progress);
+ g_signal_connect(G_OBJECT(entry), "changed",
+ G_CALLBACK(move_progress), progress);
+
}
/* Grab focus */

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@ -0,0 +1,12 @@
diff -up openssh-5.8p2/ssh-keyscan.c.sigpipe openssh-5.8p2/ssh-keyscan.c
--- openssh-5.8p2/ssh-keyscan.c.sigpipe 2011-08-23 18:30:33.873025916 +0200
+++ openssh-5.8p2/ssh-keyscan.c 2011-08-23 18:32:24.574025362 +0200
@@ -715,6 +715,8 @@ main(int argc, char **argv)
fdlim_set(maxfd);
fdcon = xcalloc(maxfd, sizeof(con));
+ signal(SIGPIPE, SIG_IGN);
+
read_wait_nfdset = howmany(maxfd, NFDBITS);
read_wait = xcalloc(read_wait_nfdset, sizeof(fd_mask));

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@ -0,0 +1,24 @@
diff -up openssh-5.9p0/ssh.1.ipv6man openssh-5.9p0/ssh.1
--- openssh-5.9p0/ssh.1.ipv6man 2011-08-05 22:17:32.000000000 +0200
+++ openssh-5.9p0/ssh.1 2011-08-31 13:08:34.880024485 +0200
@@ -1400,6 +1400,8 @@ manual page for more information.
.Nm
exits with the exit status of the remote command or with 255
if an error occurred.
+.Sh IPV6
+IPv6 address can be used everywhere where IPv4 address. In all entries must be the IPv6 address enclosed in square brackets. Note: The square brackets are metacharacters for the shell and must be escaped in shell.
.Sh SEE ALSO
.Xr scp 1 ,
.Xr sftp 1 ,
diff -up openssh-5.9p0/sshd.8.ipv6man openssh-5.9p0/sshd.8
--- openssh-5.9p0/sshd.8.ipv6man 2011-08-05 22:17:32.000000000 +0200
+++ openssh-5.9p0/sshd.8 2011-08-31 13:10:34.129039094 +0200
@@ -940,6 +940,8 @@ concurrently for different ports, this c
started last).
The content of this file is not sensitive; it can be world-readable.
.El
+.Sh IPV6
+IPv6 address can be used everywhere where IPv4 address. In all entries must be the IPv6 address enclosed in square brackets. Note: The square brackets are metacharacters for the shell and must be escaped in shell.
.Sh SEE ALSO
.Xr scp 1 ,
.Xr sftp 1 ,

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@ -0,0 +1,101 @@
diff -up openssh-5.9p1/cipher-ctr.c.ctr-evp openssh-5.9p1/cipher-ctr.c
--- openssh-5.9p1/cipher-ctr.c.ctr-evp 2012-01-11 09:24:06.000000000 +0100
+++ openssh-5.9p1/cipher-ctr.c 2012-01-11 15:54:04.675956600 +0100
@@ -38,7 +38,7 @@ void ssh_aes_ctr_iv(EVP_CIPHER_CTX *, in
struct ssh_aes_ctr_ctx
{
- AES_KEY aes_ctx;
+ EVP_CIPHER_CTX ecbctx;
u_char aes_counter[AES_BLOCK_SIZE];
};
@@ -63,21 +63,42 @@ ssh_aes_ctr(EVP_CIPHER_CTX *ctx, u_char
{
struct ssh_aes_ctr_ctx *c;
size_t n = 0;
- u_char buf[AES_BLOCK_SIZE];
+ u_char ctrbuf[AES_BLOCK_SIZE*256];
+ u_char buf[AES_BLOCK_SIZE*256];
if (len == 0)
return (1);
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL)
return (0);
- while ((len--) > 0) {
+ for (; len > 0; len -= sizeof(u_int)) {
+ u_int r,a,b;
+
if (n == 0) {
- AES_encrypt(c->aes_counter, buf, &c->aes_ctx);
- ssh_ctr_inc(c->aes_counter, AES_BLOCK_SIZE);
+ int outl, i, buflen;
+
+ buflen = MIN(len, sizeof(ctrbuf));
+
+ for(i = 0; i < buflen; i += AES_BLOCK_SIZE) {
+ memcpy(&ctrbuf[i], c->aes_counter, AES_BLOCK_SIZE);
+ ssh_ctr_inc(c->aes_counter, AES_BLOCK_SIZE);
+ }
+
+ EVP_EncryptUpdate(&c->ecbctx, buf, &outl,
+ ctrbuf, buflen);
}
- *(dest++) = *(src++) ^ buf[n];
- n = (n + 1) % AES_BLOCK_SIZE;
+
+ memcpy(&a, src, sizeof(a));
+ memcpy(&b, &buf[n], sizeof(b));
+ r = a ^ b;
+ memcpy(dest, &r, sizeof(r));
+ src += sizeof(a);
+ dest += sizeof(r);
+
+ n = (n + sizeof(b)) % sizeof(buf);
}
+ memset(ctrbuf, '\0', sizeof(ctrbuf));
+ memset(buf, '\0', sizeof(buf));
return (1);
}
@@ -91,9 +112,28 @@ ssh_aes_ctr_init(EVP_CIPHER_CTX *ctx, co
c = xmalloc(sizeof(*c));
EVP_CIPHER_CTX_set_app_data(ctx, c);
}
- if (key != NULL)
- AES_set_encrypt_key(key, EVP_CIPHER_CTX_key_length(ctx) * 8,
- &c->aes_ctx);
+
+ EVP_CIPHER_CTX_init(&c->ecbctx);
+
+ if (key != NULL) {
+ const EVP_CIPHER *cipher;
+ switch(EVP_CIPHER_CTX_key_length(ctx)*8) {
+ case 128:
+ cipher = EVP_aes_128_ecb();
+ break;
+ case 192:
+ cipher = EVP_aes_192_ecb();
+ break;
+ case 256:
+ cipher = EVP_aes_256_ecb();
+ break;
+ default:
+ fatal("ssh_aes_ctr_init: wrong aes key length");
+ }
+ if(!EVP_EncryptInit_ex(&c->ecbctx, cipher, NULL, key, NULL))
+ fatal("ssh_aes_ctr_init: cannot initialize aes encryption");
+ EVP_CIPHER_CTX_set_padding(&c->ecbctx, 0);
+ }
if (iv != NULL)
memcpy(c->aes_counter, iv, AES_BLOCK_SIZE);
return (1);
@@ -105,6 +145,7 @@ ssh_aes_ctr_cleanup(EVP_CIPHER_CTX *ctx)
struct ssh_aes_ctr_ctx *c;
if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
+ EVP_CIPHER_CTX_cleanup(&c->ecbctx);
memset(c, 0, sizeof(*c));
free(c);
EVP_CIPHER_CTX_set_app_data(ctx, NULL);

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@ -0,0 +1,16 @@
diff --git a/scp.c b/scp.c
index d98fa67..25d347b 100644
--- a/scp.c
+++ b/scp.c
@@ -638,7 +638,10 @@ toremote(char *targ, int argc, char **argv)
addargs(&alist, "%s", ssh_program);
addargs(&alist, "-x");
addargs(&alist, "-oClearAllForwardings=yes");
- addargs(&alist, "-n");
+ if (isatty(fileno(stdin)))
+ addargs(&alist, "-t");
+ else
+ addargs(&alist, "-n");
for (j = 0; j < remote_remote_args.num; j++) {
addargs(&alist, "%s",
remote_remote_args.list[j]);

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@ -0,0 +1,263 @@
diff -up openssh-8.6p1/log.c.log-in-chroot openssh-8.6p1/log.c
--- openssh-8.6p1/log.c.log-in-chroot 2021-04-16 05:55:25.000000000 +0200
+++ openssh-8.6p1/log.c 2021-05-06 11:32:25.179006811 +0200
@@ -194,6 +194,11 @@ void
log_init(const char *av0, LogLevel level, SyslogFacility facility,
int on_stderr)
{
+ log_init_handler(av0, level, facility, on_stderr, 1);
+}
+
+void
+log_init_handler(const char *av0, LogLevel level, SyslogFacility facility, int on_stderr, int reset_handler) {
#if defined(HAVE_OPENLOG_R) && defined(SYSLOG_DATA_INIT)
struct syslog_data sdata = SYSLOG_DATA_INIT;
#endif
@@ -206,8 +211,10 @@ log_init(const char *av0, LogLevel level
exit(1);
}
- log_handler = NULL;
- log_handler_ctx = NULL;
+ if (reset_handler) {
+ log_handler = NULL;
+ log_handler_ctx = NULL;
+ }
log_on_stderr = on_stderr;
if (on_stderr)
diff -up openssh-8.6p1/log.h.log-in-chroot openssh-8.6p1/log.h
--- openssh-8.6p1/log.h.log-in-chroot 2021-05-06 11:32:25.179006811 +0200
+++ openssh-8.6p1/log.h 2021-05-06 11:34:22.349925757 +0200
@@ -52,6 +52,7 @@ typedef enum {
typedef void (log_handler_fn)(LogLevel, int, const char *, void *);
void log_init(const char *, LogLevel, SyslogFacility, int);
+void log_init_handler(const char *, LogLevel, SyslogFacility, int, int);
LogLevel log_level_get(void);
int log_change_level(LogLevel);
int log_is_on_stderr(void);
diff -up openssh-8.6p1/monitor.c.log-in-chroot openssh-8.6p1/monitor.c
--- openssh-8.6p1/monitor.c.log-in-chroot 2021-05-06 11:32:25.153006607 +0200
+++ openssh-8.6p1/monitor.c 2021-05-06 11:33:37.671575348 +0200
@@ -297,6 +297,8 @@ monitor_child_preauth(struct ssh *ssh, s
close(pmonitor->m_log_sendfd);
pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
+ pmonitor->m_state = "preauth";
+
authctxt = (Authctxt *)ssh->authctxt;
memset(authctxt, 0, sizeof(*authctxt));
ssh->authctxt = authctxt;
@@ -408,6 +410,8 @@ monitor_child_postauth(struct ssh *ssh,
close(pmonitor->m_recvfd);
pmonitor->m_recvfd = -1;
+ pmonitor->m_state = "postauth";
+
monitor_set_child_handler(pmonitor->m_pid);
ssh_signal(SIGHUP, &monitor_child_handler);
ssh_signal(SIGTERM, &monitor_child_handler);
@@ -480,7 +484,7 @@ monitor_read_log(struct monitor *pmonito
/* Log it */
if (log_level_name(level) == NULL)
fatal_f("invalid log level %u (corrupted message?)", level);
- sshlogdirect(level, forced, "%s [preauth]", msg);
+ sshlogdirect(level, forced, "%s [%s]", msg, pmonitor->m_state);
sshbuf_free(logmsg);
free(msg);
@@ -1868,13 +1872,28 @@ monitor_init(void)
mon = xcalloc(1, sizeof(*mon));
monitor_openfds(mon, 1);
+ mon->m_state = "";
+
return mon;
}
void
-monitor_reinit(struct monitor *mon)
+monitor_reinit(struct monitor *mon, const char *chroot_dir)
{
- monitor_openfds(mon, 0);
+ struct stat dev_log_stat;
+ char *dev_log_path;
+ int do_logfds = 0;
+
+ if (chroot_dir != NULL) {
+ xasprintf(&dev_log_path, "%s/dev/log", chroot_dir);
+
+ if (stat(dev_log_path, &dev_log_stat) != 0) {
+ debug_f("/dev/log doesn't exist in %s chroot - will try to log via monitor using [postauth] suffix", chroot_dir);
+ do_logfds = 1;
+ }
+ free(dev_log_path);
+ }
+ monitor_openfds(mon, do_logfds);
}
#ifdef GSSAPI
diff -up openssh-8.6p1/monitor.h.log-in-chroot openssh-8.6p1/monitor.h
--- openssh-8.6p1/monitor.h.log-in-chroot 2021-05-06 11:32:25.153006607 +0200
+++ openssh-8.6p1/monitor.h 2021-05-06 11:32:25.180006819 +0200
@@ -80,10 +80,11 @@ struct monitor {
int m_log_sendfd;
struct kex **m_pkex;
pid_t m_pid;
+ char *m_state;
};
struct monitor *monitor_init(void);
-void monitor_reinit(struct monitor *);
+void monitor_reinit(struct monitor *, const char *);
struct Authctxt;
void monitor_child_preauth(struct ssh *, struct monitor *);
diff -up openssh-8.6p1/session.c.log-in-chroot openssh-8.6p1/session.c
--- openssh-8.6p1/session.c.log-in-chroot 2021-05-06 11:32:25.166006709 +0200
+++ openssh-8.6p1/session.c 2021-05-06 11:32:25.181006827 +0200
@@ -160,6 +160,7 @@ login_cap_t *lc;
static int is_child = 0;
static int in_chroot = 0;
+static int have_dev_log = 1;
/* File containing userauth info, if ExposeAuthInfo set */
static char *auth_info_file = NULL;
@@ -661,6 +662,7 @@ do_exec(struct ssh *ssh, Session *s, con
int ret;
const char *forced = NULL, *tty = NULL;
char session_type[1024];
+ struct stat dev_log_stat;
if (options.adm_forced_command) {
original_command = command;
@@ -720,6 +722,10 @@ do_exec(struct ssh *ssh, Session *s, con
tty += 5;
}
+ if (lstat("/dev/log", &dev_log_stat) != 0) {
+ have_dev_log = 0;
+ }
+
verbose("Starting session: %s%s%s for %s from %.200s port %d id %d",
session_type,
tty == NULL ? "" : " on ",
@@ -1524,14 +1530,6 @@ child_close_fds(struct ssh *ssh)
/* Stop directing logs to a high-numbered fd before we close it */
log_redirect_stderr_to(NULL);
-
- /*
- * 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.
- */
- closefrom(STDERR_FILENO + 1);
}
/*
@@ -1665,8 +1663,6 @@ do_child(struct ssh *ssh, Session *s, co
exit(1);
}
- closefrom(STDERR_FILENO + 1);
-
do_rc_files(ssh, s, shell);
/* restore SIGPIPE for child */
@@ -1691,9 +1687,17 @@ do_child(struct ssh *ssh, Session *s, co
argv[i] = NULL;
optind = optreset = 1;
__progname = argv[0];
- exit(sftp_server_main(i, argv, s->pw));
+ exit(sftp_server_main(i, argv, s->pw, have_dev_log));
}
+ /*
+ * 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.
+ */
+ closefrom(STDERR_FILENO + 1);
+
fflush(NULL);
/* Get the last component of the shell name. */
diff -up openssh-8.6p1/sftp.h.log-in-chroot openssh-8.6p1/sftp.h
--- openssh-8.6p1/sftp.h.log-in-chroot 2021-04-16 05:55:25.000000000 +0200
+++ openssh-8.6p1/sftp.h 2021-05-06 11:32:25.181006827 +0200
@@ -97,5 +97,5 @@
struct passwd;
-int sftp_server_main(int, char **, struct passwd *);
+int sftp_server_main(int, char **, struct passwd *, int);
void sftp_server_cleanup_exit(int) __attribute__((noreturn));
diff -up openssh-8.6p1/sftp-server.c.log-in-chroot openssh-8.6p1/sftp-server.c
--- openssh-8.6p1/sftp-server.c.log-in-chroot 2021-04-16 05:55:25.000000000 +0200
+++ openssh-8.6p1/sftp-server.c 2021-05-06 11:32:25.181006827 +0200
@@ -1644,7 +1644,7 @@ sftp_server_usage(void)
}
int
-sftp_server_main(int argc, char **argv, struct passwd *user_pw)
+sftp_server_main(int argc, char **argv, struct passwd *user_pw, int reset_handler)
{
fd_set *rset, *wset;
int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
@@ -1657,7 +1657,7 @@ sftp_server_main(int argc, char **argv,
extern char *__progname;
__progname = ssh_get_progname(argv[0]);
- log_init(__progname, log_level, log_facility, log_stderr);
+ log_init_handler(__progname, log_level, log_facility, log_stderr, reset_handler);
pw = pwcopy(user_pw);
@@ -1730,7 +1730,7 @@ sftp_server_main(int argc, char **argv,
}
}
- log_init(__progname, log_level, log_facility, log_stderr);
+ log_init_handler(__progname, log_level, log_facility, log_stderr, reset_handler);
/*
* On platforms where we can, avoid making /proc/self/{mem,maps}
diff -up openssh-8.6p1/sftp-server-main.c.log-in-chroot openssh-8.6p1/sftp-server-main.c
--- openssh-8.6p1/sftp-server-main.c.log-in-chroot 2021-04-16 05:55:25.000000000 +0200
+++ openssh-8.6p1/sftp-server-main.c 2021-05-06 11:32:25.181006827 +0200
@@ -50,5 +50,5 @@ main(int argc, char **argv)
return 1;
}
- return (sftp_server_main(argc, argv, user_pw));
+ return (sftp_server_main(argc, argv, user_pw, 0));
}
diff -up openssh-8.6p1/sshd.c.log-in-chroot openssh-8.6p1/sshd.c
--- openssh-8.6p1/sshd.c.log-in-chroot 2021-05-06 11:32:25.177006795 +0200
+++ openssh-8.6p1/sshd.c 2021-05-06 11:32:25.182006834 +0200
@@ -559,7 +559,7 @@ privsep_postauth(struct ssh *ssh, Authct
}
/* New socket pair */
- monitor_reinit(pmonitor);
+ monitor_reinit(pmonitor, options.chroot_directory);
pmonitor->m_pid = fork();
if (pmonitor->m_pid == -1)
@@ -578,6 +578,11 @@ privsep_postauth(struct ssh *ssh, Authct
close(pmonitor->m_sendfd);
pmonitor->m_sendfd = -1;
+ close(pmonitor->m_log_recvfd);
+ pmonitor->m_log_recvfd = -1;
+
+ if (pmonitor->m_log_sendfd != -1)
+ set_log_handler(mm_log_handler, pmonitor);
/* Demote the private keys to public keys. */
demote_sensitive_data();

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@ -0,0 +1,14 @@
--- a/scp.c
+++ a/scp.c
@@ -1084,6 +1084,10 @@ sink(int argc, char **argv)
free(vect[0]);
continue;
}
+ if (buf[0] == 'C' && ! exists && np[strlen(np)-1] == '/') {
+ errno = ENOTDIR;
+ goto bad;
+ }
omode = mode;
mode |= S_IWUSR;
if ((ofd = open(np, O_WRONLY|O_CREAT, mode)) == -1) {
--

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@ -0,0 +1,133 @@
diff --git a/openbsd-compat/port-linux-sshd.c b/openbsd-compat/port-linux-sshd.c
index 8f32464..18a2ca4 100644
--- a/openbsd-compat/port-linux-sshd.c
+++ b/openbsd-compat/port-linux-sshd.c
@@ -32,6 +32,7 @@
#include "misc.h" /* servconf.h needs misc.h for struct ForwardOptions */
#include "servconf.h"
#include "port-linux.h"
+#include "misc.h"
#include "sshkey.h"
#include "hostfile.h"
#include "auth.h"
@@ -445,7 +446,7 @@ sshd_selinux_setup_exec_context(char *pwname)
void
sshd_selinux_copy_context(void)
{
- security_context_t *ctx;
+ char *ctx;
if (!sshd_selinux_enabled())
return;
@@ -461,6 +462,72 @@ sshd_selinux_copy_context(void)
}
}
+void
+sshd_selinux_change_privsep_preauth_context(void)
+{
+ int len;
+ char line[1024], *preauth_context = NULL, *cp, *arg;
+ const char *contexts_path;
+ FILE *contexts_file;
+ struct stat sb;
+
+ contexts_path = selinux_openssh_contexts_path();
+ if (contexts_path == NULL) {
+ debug3_f("Failed to get the path to SELinux context");
+ return;
+ }
+
+ if ((contexts_file = fopen(contexts_path, "r")) == NULL) {
+ debug_f("Failed to open SELinux context file");
+ return;
+ }
+
+ if (fstat(fileno(contexts_file), &sb) != 0 ||
+ sb.st_uid != 0 || (sb.st_mode & 022) != 0) {
+ logit_f("SELinux context file needs to be owned by root"
+ " and not writable by anyone else");
+ fclose(contexts_file);
+ return;
+ }
+
+ while (fgets(line, sizeof(line), contexts_file)) {
+ /* Strip trailing whitespace */
+ for (len = strlen(line) - 1; len > 0; len--) {
+ if (strchr(" \t\r\n", line[len]) == NULL)
+ break;
+ line[len] = '\0';
+ }
+
+ if (line[0] == '\0')
+ continue;
+
+ cp = line;
+ arg = strdelim(&cp);
+ if (arg && *arg == '\0')
+ arg = strdelim(&cp);
+
+ if (arg && strcmp(arg, "privsep_preauth") == 0) {
+ arg = strdelim(&cp);
+ if (!arg || *arg == '\0') {
+ debug_f("privsep_preauth is empty");
+ fclose(contexts_file);
+ return;
+ }
+ preauth_context = xstrdup(arg);
+ }
+ }
+ fclose(contexts_file);
+
+ if (preauth_context == NULL) {
+ debug_f("Unable to find 'privsep_preauth' option in"
+ " SELinux context file");
+ return;
+ }
+
+ ssh_selinux_change_context(preauth_context);
+ free(preauth_context);
+}
+
#endif
#endif
diff --git a/openbsd-compat/port-linux.c b/openbsd-compat/port-linux.c
index 22ea8ef..1fc963d 100644
--- a/openbsd-compat/port-linux.c
+++ b/openbsd-compat/port-linux.c
@@ -179,7 +179,7 @@ ssh_selinux_change_context(const char *newname)
strlcpy(newctx + len, newname, newlen - len);
if ((cx = index(cx + 1, ':')))
strlcat(newctx, cx, newlen);
- debug3("%s: setting context from '%s' to '%s'", __func__,
+ debug_f("setting context from '%s' to '%s'",
oldctx, newctx);
if (setcon(newctx) < 0)
do_log2(log_level, "%s: setcon %s from %s failed with %s",
__func__, newctx, oldctx, strerror(errno));
diff --git a/openbsd-compat/port-linux.h b/openbsd-compat/port-linux.h
index cb51f99..8b7cda2 100644
--- a/openbsd-compat/port-linux.h
+++ b/openbsd-compat/port-linux.h
@@ -29,6 +29,7 @@ int sshd_selinux_enabled(void);
void sshd_selinux_copy_context(void);
void sshd_selinux_setup_exec_context(char *);
int sshd_selinux_setup_env_variables(void);
+void sshd_selinux_change_privsep_preauth_context(void);
#endif
#ifdef LINUX_OOM_ADJUST
diff --git a/sshd.c b/sshd.c
index 2871fe9..39b9c08 100644
--- a/sshd.c
+++ b/sshd.c
@@ -629,7 +629,7 @@ privsep_preauth_child(void)
demote_sensitive_data();
#ifdef WITH_SELINUX
- ssh_selinux_change_context("sshd_net_t");
+ sshd_selinux_change_privsep_preauth_context();
#endif
/* Demote the child */

View File

@ -0,0 +1,131 @@
diff -up openssh-7.4p1/gss-serv-krb5.c.GSSAPIEnablek5users openssh-7.4p1/gss-serv-krb5.c
--- openssh-7.4p1/gss-serv-krb5.c.GSSAPIEnablek5users 2016-12-23 15:18:40.615216100 +0100
+++ openssh-7.4p1/gss-serv-krb5.c 2016-12-23 15:18:40.628216102 +0100
@@ -279,7 +279,6 @@ ssh_gssapi_krb5_cmdok(krb5_principal pri
FILE *fp;
char file[MAXPATHLEN];
char *line = NULL;
- char kuser[65]; /* match krb5_kuserok() */
struct stat st;
struct passwd *pw = the_authctxt->pw;
int found_principal = 0;
@@ -288,7 +287,7 @@ ssh_gssapi_krb5_cmdok(krb5_principal pri
snprintf(file, sizeof(file), "%s/.k5users", pw->pw_dir);
/* If both .k5login and .k5users DNE, self-login is ok. */
- if (!k5login_exists && (access(file, F_OK) == -1)) {
+ if ( !options.enable_k5users || (!k5login_exists && (access(file, F_OK) == -1))) {
return ssh_krb5_kuserok(krb_context, principal, luser,
k5login_exists);
}
diff -up openssh-7.4p1/servconf.c.GSSAPIEnablek5users openssh-7.4p1/servconf.c
--- openssh-7.4p1/servconf.c.GSSAPIEnablek5users 2016-12-23 15:18:40.615216100 +0100
+++ openssh-7.4p1/servconf.c 2016-12-23 15:35:36.354401156 +0100
@@ -168,6 +168,7 @@ initialize_server_options(ServerOptions
options->gss_store_rekey = -1;
options->gss_kex_algorithms = NULL;
options->use_kuserok = -1;
+ options->enable_k5users = -1;
options->password_authentication = -1;
options->kbd_interactive_authentication = -1;
options->permit_empty_passwd = -1;
@@ -345,6 +346,8 @@ fill_default_server_options(ServerOption
#endif
if (options->use_kuserok == -1)
options->use_kuserok = 1;
+ if (options->enable_k5users == -1)
+ options->enable_k5users = 0;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
@@ -418,7 +421,7 @@ typedef enum {
sHostbasedUsesNameFromPacketOnly, sHostbasedAcceptedAlgorithms,
sHostKeyAlgorithms, sPerSourceMaxStartups, sPerSourceNetBlockSize,
sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
- sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
+ sGssAuthentication, sGssCleanupCreds, sGssEnablek5users, sGssStrictAcceptor,
sGssKeyEx, sGssKexAlgorithms, sGssStoreRekey,
sAcceptEnv, sSetEnv, sPermitTunnel,
sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
@@ -497,14 +500,16 @@ static struct {
{ "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL },
{ "gssapistorecredentialsonrekey", sGssStoreRekey, SSHCFG_GLOBAL },
{ "gssapikexalgorithms", sGssKexAlgorithms, SSHCFG_GLOBAL },
+ { "gssapienablek5users", sGssEnablek5users, SSHCFG_ALL },
#else
{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
{ "gssapicleanupcreds", sUnsupported, SSHCFG_GLOBAL },
{ "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL },
{ "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL },
{ "gssapistorecredentialsonrekey", sUnsupported, SSHCFG_GLOBAL },
{ "gssapikexalgorithms", sUnsupported, SSHCFG_GLOBAL },
+ { "gssapienablek5users", sUnsupported, SSHCFG_ALL },
#endif
{ "gssusesessionccache", sUnsupported, SSHCFG_GLOBAL },
{ "gssapiusesessioncredcache", sUnsupported, SSHCFG_GLOBAL },
@@ -1653,6 +1658,10 @@ process_server_config_line(ServerOptions
intptr = &options->use_kuserok;
goto parse_flag;
+ case sGssEnablek5users:
+ intptr = &options->enable_k5users;
+ goto parse_flag;
+
case sMatch:
if (cmdline)
fatal("Match directive not supported as a command-line "
@@ -2026,6 +2035,7 @@ copy_set_server_options(ServerOptions *d
M_CP_INTOPT(ip_qos_interactive);
M_CP_INTOPT(ip_qos_bulk);
M_CP_INTOPT(use_kuserok);
+ M_CP_INTOPT(enable_k5users);
M_CP_INTOPT(rekey_limit);
M_CP_INTOPT(rekey_interval);
M_CP_INTOPT(log_level);
@@ -2320,6 +2330,7 @@ dump_config(ServerOptions *o)
# endif
dump_cfg_fmtint(sKerberosUniqueCCache, o->kerberos_unique_ccache);
dump_cfg_fmtint(sKerberosUseKuserok, o->use_kuserok);
+ dump_cfg_fmtint(sGssEnablek5users, o->enable_k5users);
#endif
#ifdef GSSAPI
dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);
diff -up openssh-7.4p1/servconf.h.GSSAPIEnablek5users openssh-7.4p1/servconf.h
--- openssh-7.4p1/servconf.h.GSSAPIEnablek5users 2016-12-23 15:18:40.616216100 +0100
+++ openssh-7.4p1/servconf.h 2016-12-23 15:18:40.629216102 +0100
@@ -174,6 +174,7 @@ typedef struct {
int kerberos_unique_ccache; /* If true, the acquired ticket will
* be stored in per-session ccache */
int use_kuserok;
+ int enable_k5users;
int gss_authentication; /* If true, permit GSSAPI authentication */
int gss_keyex; /* If true, permit GSSAPI key exchange */
int gss_cleanup_creds; /* If true, destroy cred cache on logout */
diff -up openssh-7.4p1/sshd_config.5.GSSAPIEnablek5users openssh-7.4p1/sshd_config.5
--- openssh-7.4p1/sshd_config.5.GSSAPIEnablek5users 2016-12-23 15:18:40.630216103 +0100
+++ openssh-7.4p1/sshd_config.5 2016-12-23 15:36:21.607408435 +0100
@@ -628,6 +628,12 @@ Specifies whether to automatically destr
on logout.
The default is
.Cm yes .
+.It Cm GSSAPIEnablek5users
+Specifies whether to look at .k5users file for GSSAPI authentication
+access control. Further details are described in
+.Xr ksu 1 .
+The default is
+.Cm no .
.It Cm GSSAPIKeyExchange
Specifies whether key exchange based on GSSAPI is allowed. GSSAPI key exchange
doesn't rely on ssh keys to verify host identity.
diff -up openssh-7.4p1/sshd_config.GSSAPIEnablek5users openssh-7.4p1/sshd_config
--- openssh-7.4p1/sshd_config.GSSAPIEnablek5users 2016-12-23 15:18:40.616216100 +0100
+++ openssh-7.4p1/sshd_config 2016-12-23 15:18:40.631216103 +0100
@@ -80,6 +80,7 @@ GSSAPIAuthentication yes
#GSSAPICleanupCredentials yes
#GSSAPIStrictAcceptorCheck yes
#GSSAPIKeyExchange no
+#GSSAPIEnablek5users no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will

View File

@ -0,0 +1,39 @@
diff -up openssh/sshd.c.ip-opts openssh/sshd.c
--- openssh/sshd.c.ip-opts 2016-07-25 13:58:48.998507834 +0200
+++ openssh/sshd.c 2016-07-25 14:01:28.346469878 +0200
@@ -1507,12 +1507,29 @@ check_ip_options(struct ssh *ssh)
if (getsockopt(sock_in, IPPROTO_IP, IP_OPTIONS, opts,
&option_size) >= 0 && option_size != 0) {
- text[0] = '\0';
- for (i = 0; i < option_size; i++)
- snprintf(text + i*3, sizeof(text) - i*3,
- " %2.2x", opts[i]);
- fatal("Connection from %.100s port %d with IP opts: %.800s",
- ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text);
+ i = 0;
+ do {
+ switch (opts[i]) {
+ case 0:
+ case 1:
+ ++i;
+ break;
+ case 130:
+ case 133:
+ case 134:
+ i += opts[i + 1];
+ break;
+ default:
+ /* Fail, fatally, if we detect either loose or strict
+ * source routing options. */
+ text[0] = '\0';
+ for (i = 0; i < option_size; i++)
+ snprintf(text + i*3, sizeof(text) - i*3,
+ " %2.2x", opts[i]);
+ fatal("Connection from %.100s port %d with IP options:%.800s",
+ ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), text);
+ }
+ } while (i < option_size);
}
return;
#endif /* IP_OPTIONS */

View File

@ -0,0 +1,280 @@
diff --git a/gss-serv-krb5.c b/gss-serv-krb5.c
index 413b845..54dd383 100644
--- a/gss-serv-krb5.c
+++ b/gss-serv-krb5.c
@@ -32,7 +32,9 @@
#include <sys/types.h>
#include <stdarg.h>
+#include <stdio.h>
#include <string.h>
+#include <unistd.h>
#include "xmalloc.h"
#include "sshkey.h"
@@ -45,6 +47,7 @@
#include "ssh-gss.h"
+extern Authctxt *the_authctxt;
extern ServerOptions options;
#ifdef HEIMDAL
@@ -56,6 +59,13 @@ extern ServerOptions options;
# include <gssapi/gssapi_krb5.h>
#endif
+/* all commands are allowed by default */
+char **k5users_allowed_cmds = NULL;
+
+static int ssh_gssapi_k5login_exists();
+static int ssh_gssapi_krb5_cmdok(krb5_principal, const char *, const char *,
+ int);
+
static krb5_context krb_context = NULL;
/* Initialise the krb5 library, for the stuff that GSSAPI won't do */
@@ -88,6 +98,7 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
krb5_principal princ;
int retval;
const char *errmsg;
+ int k5login_exists;
if (ssh_gssapi_krb5_init() == 0)
return 0;
@@ -99,10 +110,22 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
krb5_free_error_message(krb_context, errmsg);
return 0;
}
- if (krb5_kuserok(krb_context, princ, name)) {
+ /* krb5_kuserok() returns 1 if .k5login DNE and this is self-login.
+ * We have to make sure to check .k5users in that case. */
+ k5login_exists = ssh_gssapi_k5login_exists();
+ /* NOTE: .k5login and .k5users must opened as root, not the user,
+ * because if they are on a krb5-protected filesystem, user credentials
+ * to access these files aren't available yet. */
+ if (krb5_kuserok(krb_context, princ, name) && k5login_exists) {
retval = 1;
logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
name, (char *)client->displayname.value);
+ } else if (ssh_gssapi_krb5_cmdok(princ, client->exportedname.value,
+ name, k5login_exists)) {
+ retval = 1;
+ logit("Authorized to %s, krb5 principal %s "
+ "(ssh_gssapi_krb5_cmdok)",
+ name, (char *)client->displayname.value);
} else
retval = 0;
@@ -110,6 +133,137 @@ ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
return retval;
}
+/* Test for existence of .k5login.
+ * We need this as part of our .k5users check, because krb5_kuserok()
+ * returns success if .k5login DNE and user is logging in as himself.
+ * With .k5login absent and .k5users present, we don't want absence
+ * of .k5login to authorize self-login. (absence of both is required)
+ * Returns 1 if .k5login is available, 0 otherwise.
+ */
+static int
+ssh_gssapi_k5login_exists()
+{
+ char file[MAXPATHLEN];
+ struct passwd *pw = the_authctxt->pw;
+
+ snprintf(file, sizeof(file), "%s/.k5login", pw->pw_dir);
+ return access(file, F_OK) == 0;
+}
+
+/* check .k5users for login or command authorization
+ * Returns 1 if principal is authorized, 0 otherwise.
+ * If principal is authorized, (global) k5users_allowed_cmds may be populated.
+ */
+static int
+ssh_gssapi_krb5_cmdok(krb5_principal principal, const char *name,
+ const char *luser, int k5login_exists)
+{
+ FILE *fp;
+ char file[MAXPATHLEN];
+ char *line = NULL;
+ char kuser[65]; /* match krb5_kuserok() */
+ struct stat st;
+ struct passwd *pw = the_authctxt->pw;
+ int found_principal = 0;
+ int ncommands = 0, allcommands = 0;
+ u_long linenum = 0;
+ size_t linesize = 0;
+
+ snprintf(file, sizeof(file), "%s/.k5users", pw->pw_dir);
+ /* If both .k5login and .k5users DNE, self-login is ok. */
+ if (!k5login_exists && (access(file, F_OK) == -1)) {
+ return (krb5_aname_to_localname(krb_context, principal,
+ sizeof(kuser), kuser) == 0) &&
+ (strcmp(kuser, luser) == 0);
+ }
+ if ((fp = fopen(file, "r")) == NULL) {
+ int saved_errno = errno;
+ /* 2nd access check to ease debugging if file perms are wrong.
+ * But we don't want to report this if .k5users simply DNE. */
+ if (access(file, F_OK) == 0) {
+ logit("User %s fopen %s failed: %s",
+ pw->pw_name, file, strerror(saved_errno));
+ }
+ return 0;
+ }
+ /* .k5users must be owned either by the user or by root */
+ if (fstat(fileno(fp), &st) == -1) {
+ /* can happen, but very wierd error so report it */
+ logit("User %s fstat %s failed: %s",
+ pw->pw_name, file, strerror(errno));
+ fclose(fp);
+ return 0;
+ }
+ if (!(st.st_uid == pw->pw_uid || st.st_uid == 0)) {
+ logit("User %s %s is not owned by root or user",
+ pw->pw_name, file);
+ fclose(fp);
+ return 0;
+ }
+ /* .k5users must be a regular file. krb5_kuserok() doesn't do this
+ * check, but we don't want to be deficient if they add a check. */
+ if (!S_ISREG(st.st_mode)) {
+ logit("User %s %s is not a regular file", pw->pw_name, file);
+ fclose(fp);
+ return 0;
+ }
+ /* file exists; initialize k5users_allowed_cmds (to none!) */
+ k5users_allowed_cmds = xcalloc(++ncommands,
+ sizeof(*k5users_allowed_cmds));
+
+ /* Check each line. ksu allows unlimited length lines. */
+ while (!allcommands && getline(&line, &linesize, fp) != -1) {
+ linenum++;
+ char *token;
+
+ /* we parse just like ksu, even though we could do better */
+ if ((token = strtok(line, " \t\n")) == NULL)
+ continue;
+ if (strcmp(name, token) == 0) {
+ /* we matched on client principal */
+ found_principal = 1;
+ if ((token = strtok(NULL, " \t\n")) == NULL) {
+ /* only shell is allowed */
+ k5users_allowed_cmds[ncommands-1] =
+ xstrdup(pw->pw_shell);
+ k5users_allowed_cmds =
+ xreallocarray(k5users_allowed_cmds, ++ncommands,
+ sizeof(*k5users_allowed_cmds));
+ break;
+ }
+ /* process the allowed commands */
+ while (token) {
+ if (strcmp(token, "*") == 0) {
+ allcommands = 1;
+ break;
+ }
+ k5users_allowed_cmds[ncommands-1] =
+ xstrdup(token);
+ k5users_allowed_cmds =
+ xreallocarray(k5users_allowed_cmds, ++ncommands,
+ sizeof(*k5users_allowed_cmds));
+ token = strtok(NULL, " \t\n");
+ }
+ }
+ }
+ free(line);
+ if (k5users_allowed_cmds) {
+ /* terminate vector */
+ k5users_allowed_cmds[ncommands-1] = NULL;
+ /* if all commands are allowed, free vector */
+ if (allcommands) {
+ int i;
+ for (i = 0; i < ncommands; i++) {
+ free(k5users_allowed_cmds[i]);
+ }
+ free(k5users_allowed_cmds);
+ k5users_allowed_cmds = NULL;
+ }
+ }
+ fclose(fp);
+ return found_principal;
+}
+
/* This writes out any forwarded credentials from the structure populated
* during userauth. Called after we have setuid to the user */
diff --git a/session.c b/session.c
index 28659ec..9c94d8e 100644
--- a/session.c
+++ b/session.c
@@ -789,6 +789,29 @@ do_exec(Session *s, const char *command)
command = auth_opts->force_command;
forced = "(key-option)";
}
+#ifdef GSSAPI
+#ifdef KRB5 /* k5users_allowed_cmds only available w/ GSSAPI+KRB5 */
+ else if (k5users_allowed_cmds) {
+ const char *match = command;
+ int allowed = 0, i = 0;
+
+ if (!match)
+ match = s->pw->pw_shell;
+ while (k5users_allowed_cmds[i]) {
+ if (strcmp(match, k5users_allowed_cmds[i++]) == 0) {
+ debug("Allowed command '%.900s'", match);
+ allowed = 1;
+ break;
+ }
+ }
+ if (!allowed) {
+ debug("command '%.900s' not allowed", match);
+ return 1;
+ }
+ }
+#endif
+#endif
+
s->forced = 0;
if (forced != NULL) {
s->forced = 1;
diff --git a/ssh-gss.h b/ssh-gss.h
index 0374c88..509109a 100644
--- a/ssh-gss.h
+++ b/ssh-gss.h
@@ -49,6 +49,10 @@
# endif /* !HAVE_DECL_GSS_C_NT_... */
# endif /* !HEIMDAL */
+
+/* .k5users support */
+extern char **k5users_allowed_cmds;
+
#endif /* KRB5 */
/* draft-ietf-secsh-gsskeyex-06 */
diff --git a/sshd.8 b/sshd.8
index adcaaf9..824163b 100644
--- a/sshd.8
+++ b/sshd.8
@@ -324,6 +324,7 @@ Finally, the server and the client enter an authentication dialog.
The client tries to authenticate itself using
host-based authentication,
public key authentication,
+GSSAPI authentication,
challenge-response authentication,
or password authentication.
.Pp
@@ -800,6 +801,12 @@ This file is used in exactly the same way as
but allows host-based authentication without permitting login with
rlogin/rsh.
.Pp
+.It Pa ~/.k5login
+.It Pa ~/.k5users
+These files enforce GSSAPI/Kerberos authentication access control.
+Further details are described in
+.Xr ksu 1 .
+.Pp
.It Pa ~/.ssh/
This directory is the default location for all user-specific configuration
and authentication information.

View File

@ -0,0 +1,484 @@
diff -up openssh/misc.c.keycat openssh/misc.c
--- openssh/misc.c.keycat 2015-06-24 10:57:50.158849606 +0200
+++ openssh/misc.c 2015-06-24 11:04:23.989868638 +0200
@@ -966,6 +966,13 @@ subprocess(const char *tag, struct passw
error("%s: dup2: %s", tag, strerror(errno));
_exit(1);
}
+#ifdef WITH_SELINUX
+ if (sshd_selinux_setup_env_variables() < 0) {
+ error ("failed to copy environment: %s",
+ strerror(errno));
+ _exit(127);
+ }
+#endif
if (env != NULL)
execve(av[0], av, env);
else
diff -up openssh/HOWTO.ssh-keycat.keycat openssh/HOWTO.ssh-keycat
--- openssh/HOWTO.ssh-keycat.keycat 2015-06-24 10:57:50.157849608 +0200
+++ openssh/HOWTO.ssh-keycat 2015-06-24 10:57:50.157849608 +0200
@@ -0,0 +1,12 @@
+The ssh-keycat retrieves the content of the ~/.ssh/authorized_keys
+of an user in any environment. This includes environments with
+polyinstantiation of home directories and SELinux MLS policy enabled.
+
+To use ssh-keycat, set these options in /etc/ssh/sshd_config file:
+ AuthorizedKeysCommand /usr/libexec/openssh/ssh-keycat
+ AuthorizedKeysCommandUser root
+
+Do not forget to enable public key authentication:
+ PubkeyAuthentication yes
+
+
diff -up openssh/Makefile.in.keycat openssh/Makefile.in
--- openssh/Makefile.in.keycat 2015-06-24 10:57:50.152849621 +0200
+++ openssh/Makefile.in 2015-06-24 10:57:50.157849608 +0200
@@ -27,6 +27,7 @@ SFTP_SERVER=$(libexecdir)/sftp-server
ASKPASS_PROGRAM=$(libexecdir)/ssh-askpass
SFTP_SERVER=$(libexecdir)/sftp-server
SSH_KEYSIGN=$(libexecdir)/ssh-keysign
+SSH_KEYCAT=$(libexecdir)/ssh-keycat
SSH_PKCS11_HELPER=$(libexecdir)/ssh-pkcs11-helper
SSH_SK_HELPER=$(libexecdir)/ssh-sk-helper
PRIVSEP_PATH=@PRIVSEP_PATH@
@@ -52,6 +52,7 @@ K5LIBS=@K5LIBS@
K5LIBS=@K5LIBS@
GSSLIBS=@GSSLIBS@
SSHDLIBS=@SSHDLIBS@
+KEYCATLIBS=@KEYCATLIBS@
LIBEDIT=@LIBEDIT@
LIBFIDO2=@LIBFIDO2@
AR=@AR@
@@ -65,7 +66,7 @@ EXEEXT=@EXEEXT@
.SUFFIXES: .lo
-TARGETS=ssh$(EXEEXT) sshd$(EXEEXT) ssh-add$(EXEEXT) ssh-keygen$(EXEEXT) ssh-keyscan${EXEEXT} ssh-keysign${EXEEXT} ssh-pkcs11-helper$(EXEEXT) ssh-agent$(EXEEXT) scp$(EXEEXT) sftp-server$(EXEEXT) sftp$(EXEEXT) ssh-sk-helper$(EXEEXT)
+TARGETS=ssh$(EXEEXT) sshd$(EXEEXT) ssh-add$(EXEEXT) ssh-keygen$(EXEEXT) ssh-keyscan${EXEEXT} ssh-keysign${EXEEXT} ssh-pkcs11-helper$(EXEEXT) ssh-agent$(EXEEXT) scp$(EXEEXT) sftp-server$(EXEEXT) sftp$(EXEEXT) ssh-sk-helper$(EXEEXT) ssh-keycat$(EXEEXT)
XMSS_OBJS=\
ssh-xmss.o \
@@ -190,6 +191,9 @@ ssh-pkcs11-helper$(EXEEXT): $(LIBCOMPAT)
ssh-sk-helper$(EXEEXT): $(LIBCOMPAT) libssh.a $(SKHELPER_OBJS)
$(LD) -o $@ $(SKHELPER_OBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lssh -lopenbsd-compat $(LIBS) $(LIBFIDO2)
+ssh-keycat$(EXEEXT): $(LIBCOMPAT) $(SSHDOBJS) libssh.a ssh-keycat.o uidswap.o
+ $(LD) -o $@ ssh-keycat.o uidswap.o $(LDFLAGS) -lssh -lopenbsd-compat $(KEYCATLIBS) $(LIBS)
+
ssh-keyscan$(EXEEXT): $(LIBCOMPAT) libssh.a $(SSHKEYSCAN_OBJS)
$(LD) -o $@ $(SSHKEYSCAN_OBJS) $(LDFLAGS) -lssh -lopenbsd-compat -lssh $(LIBS)
@@ -321,6 +325,7 @@ install-files:
$(INSTALL) -m 4711 $(STRIP_OPT) ssh-keysign$(EXEEXT) $(DESTDIR)$(SSH_KEYSIGN)$(EXEEXT)
$(INSTALL) -m 0755 $(STRIP_OPT) ssh-pkcs11-helper$(EXEEXT) $(DESTDIR)$(SSH_PKCS11_HELPER)$(EXEEXT)
$(INSTALL) -m 0755 $(STRIP_OPT) ssh-sk-helper$(EXEEXT) $(DESTDIR)$(SSH_SK_HELPER)$(EXEEXT)
+ $(INSTALL) -m 0755 $(STRIP_OPT) ssh-keycat$(EXEEXT) $(DESTDIR)$(libexecdir)/ssh-keycat$(EXEEXT)
$(INSTALL) -m 0755 $(STRIP_OPT) sftp$(EXEEXT) $(DESTDIR)$(bindir)/sftp$(EXEEXT)
$(INSTALL) -m 0755 $(STRIP_OPT) sftp-server$(EXEEXT) $(DESTDIR)$(SFTP_SERVER)$(EXEEXT)
$(INSTALL) -m 644 ssh.1.out $(DESTDIR)$(mandir)/$(mansubdir)1/ssh.1
diff -up openssh/openbsd-compat/port-linux.h.keycat openssh/openbsd-compat/port-linux.h
--- openssh/openbsd-compat/port-linux.h.keycat 2015-06-24 10:57:50.150849626 +0200
+++ openssh/openbsd-compat/port-linux.h 2015-06-24 10:57:50.160849601 +0200
@@ -25,8 +25,10 @@ void ssh_selinux_setup_pty(char *, const
void ssh_selinux_change_context(const char *);
void ssh_selinux_setfscreatecon(const char *);
+int sshd_selinux_enabled(void);
void sshd_selinux_copy_context(void);
void sshd_selinux_setup_exec_context(char *);
+int sshd_selinux_setup_env_variables(void);
#endif
#ifdef LINUX_OOM_ADJUST
diff -up openssh/openbsd-compat/port-linux-sshd.c.keycat openssh/openbsd-compat/port-linux-sshd.c
--- openssh/openbsd-compat/port-linux-sshd.c.keycat 2015-06-24 10:57:50.150849626 +0200
+++ openssh/openbsd-compat/port-linux-sshd.c 2015-06-24 10:57:50.159849603 +0200
@@ -54,6 +54,20 @@ extern Authctxt *the_authctxt;
extern int inetd_flag;
extern int rexeced_flag;
+/* Wrapper around is_selinux_enabled() to log its return value once only */
+int
+sshd_selinux_enabled(void)
+{
+ static int enabled = -1;
+
+ if (enabled == -1) {
+ enabled = (is_selinux_enabled() == 1);
+ debug("SELinux support %s", enabled ? "enabled" : "disabled");
+ }
+
+ return (enabled);
+}
+
/* Send audit message */
static int
sshd_selinux_send_audit_message(int success, security_context_t default_context,
@@ -308,7 +322,7 @@ sshd_selinux_getctxbyname(char *pwname,
/* Setup environment variables for pam_selinux */
static int
-sshd_selinux_setup_pam_variables(void)
+sshd_selinux_setup_variables(int(*set_it)(char *, const char *))
{
const char *reqlvl;
char *role;
@@ -319,16 +333,16 @@ sshd_selinux_setup_pam_variables(void)
ssh_selinux_get_role_level(&role, &reqlvl);
- rv = do_pam_putenv("SELINUX_ROLE_REQUESTED", role ? role : "");
+ rv = set_it("SELINUX_ROLE_REQUESTED", role ? role : "");
if (inetd_flag && !rexeced_flag) {
use_current = "1";
} else {
use_current = "";
- rv = rv || do_pam_putenv("SELINUX_LEVEL_REQUESTED", reqlvl ? reqlvl: "");
+ rv = rv || set_it("SELINUX_LEVEL_REQUESTED", reqlvl ? reqlvl: "");
}
- rv = rv || do_pam_putenv("SELINUX_USE_CURRENT_RANGE", use_current);
+ rv = rv || set_it("SELINUX_USE_CURRENT_RANGE", use_current);
if (role != NULL)
free(role);
@@ -336,6 +350,24 @@ sshd_selinux_setup_pam_variables(void)
return rv;
}
+static int
+sshd_selinux_setup_pam_variables(void)
+{
+ return sshd_selinux_setup_variables(do_pam_putenv);
+}
+
+static int
+do_setenv(char *name, const char *value)
+{
+ return setenv(name, value, 1);
+}
+
+int
+sshd_selinux_setup_env_variables(void)
+{
+ return sshd_selinux_setup_variables(do_setenv);
+}
+
/* Set the execution context to the default for the specified user */
void
sshd_selinux_setup_exec_context(char *pwname)
@@ -344,7 +376,7 @@ sshd_selinux_setup_exec_context(char *pw
int r = 0;
security_context_t default_ctx = NULL;
- if (!ssh_selinux_enabled())
+ if (!sshd_selinux_enabled())
return;
if (options.use_pam) {
@@ -415,7 +447,7 @@ sshd_selinux_copy_context(void)
{
security_context_t *ctx;
- if (!ssh_selinux_enabled())
+ if (!sshd_selinux_enabled())
return;
if (getexeccon((security_context_t *)&ctx) != 0) {
diff -up openssh/platform.c.keycat openssh/platform.c
--- openssh/platform.c.keycat 2015-06-24 10:57:50.147849633 +0200
+++ openssh/platform.c 2015-06-24 10:57:50.160849601 +0200
@@ -103,7 +103,7 @@ platform_setusercontext(struct passwd *p
{
#ifdef WITH_SELINUX
/* Cache selinux status for later use */
- (void)ssh_selinux_enabled();
+ (void)sshd_selinux_enabled();
#endif
#ifdef USE_SOLARIS_PROJECTS
diff -up openssh/ssh-keycat.c.keycat openssh/ssh-keycat.c
--- openssh/ssh-keycat.c.keycat 2015-06-24 10:57:50.161849599 +0200
+++ openssh/ssh-keycat.c 2015-06-24 10:57:50.161849599 +0200
@@ -0,0 +1,241 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, and the entire permission notice in its entirety,
+ * including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions. (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 2011 Red Hat, Inc.
+ * Written by Tomas Mraz <tmraz@redhat.com>
+*/
+
+#define _GNU_SOURCE
+
+#include "config.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <pwd.h>
+#include <fcntl.h>
+#include <unistd.h>
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+
+#include <security/pam_appl.h>
+
+#include "uidswap.h"
+#include "misc.h"
+
+#define ERR_USAGE 1
+#define ERR_PAM_START 2
+#define ERR_OPEN_SESSION 3
+#define ERR_CLOSE_SESSION 4
+#define ERR_PAM_END 5
+#define ERR_GETPWNAM 6
+#define ERR_MEMORY 7
+#define ERR_OPEN 8
+#define ERR_FILE_MODE 9
+#define ERR_FDOPEN 10
+#define ERR_STAT 11
+#define ERR_WRITE 12
+#define ERR_PAM_PUTENV 13
+#define BUFLEN 4096
+
+/* Just ignore the messages in the conversation function */
+static int
+dummy_conv(int num_msg, const struct pam_message **msgm,
+ struct pam_response **response, void *appdata_ptr)
+{
+ struct pam_response *rsp;
+
+ (void)msgm;
+ (void)appdata_ptr;
+
+ if (num_msg <= 0)
+ return PAM_CONV_ERR;
+
+ /* Just allocate the array as empty responses */
+ rsp = calloc (num_msg, sizeof (struct pam_response));
+ if (rsp == NULL)
+ return PAM_CONV_ERR;
+
+ *response = rsp;
+ return PAM_SUCCESS;
+}
+
+static struct pam_conv conv = {
+ dummy_conv,
+ NULL
+};
+
+char *
+make_auth_keys_name(const struct passwd *pwd)
+{
+ char *fname;
+
+ if (asprintf(&fname, "%s/.ssh/authorized_keys", pwd->pw_dir) < 0)
+ return NULL;
+
+ return fname;
+}
+
+int
+dump_keys(const char *user)
+{
+ struct passwd *pwd;
+ int fd = -1;
+ FILE *f = NULL;
+ char *fname = NULL;
+ int rv = 0;
+ char buf[BUFLEN];
+ size_t len;
+ struct stat st;
+
+ if ((pwd = getpwnam(user)) == NULL) {
+ return ERR_GETPWNAM;
+ }
+
+ if ((fname = make_auth_keys_name(pwd)) == NULL) {
+ return ERR_MEMORY;
+ }
+
+ temporarily_use_uid(pwd);
+
+ if ((fd = open(fname, O_RDONLY|O_NONBLOCK|O_NOFOLLOW, 0)) < 0) {
+ rv = ERR_OPEN;
+ goto fail;
+ }
+
+ if (fstat(fd, &st) < 0) {
+ rv = ERR_STAT;
+ goto fail;
+ }
+
+ if (!S_ISREG(st.st_mode) ||
+ (st.st_uid != pwd->pw_uid && st.st_uid != 0)) {
+ rv = ERR_FILE_MODE;
+ goto fail;
+ }
+
+ unset_nonblock(fd);
+
+ if ((f = fdopen(fd, "r")) == NULL) {
+ rv = ERR_FDOPEN;
+ goto fail;
+ }
+
+ fd = -1;
+
+ while ((len = fread(buf, 1, sizeof(buf), f)) > 0) {
+ rv = fwrite(buf, 1, len, stdout) != len ? ERR_WRITE : 0;
+ }
+
+fail:
+ if (fd != -1)
+ close(fd);
+ if (f != NULL)
+ fclose(f);
+ free(fname);
+ restore_uid();
+ return rv;
+}
+
+static const char *env_names[] = { "SELINUX_ROLE_REQUESTED",
+ "SELINUX_LEVEL_REQUESTED",
+ "SELINUX_USE_CURRENT_RANGE"
+};
+
+extern char **environ;
+
+int
+set_pam_environment(pam_handle_t *pamh)
+{
+ int i;
+ size_t j;
+
+ for (j = 0; j < sizeof(env_names)/sizeof(env_names[0]); ++j) {
+ int len = strlen(env_names[j]);
+
+ for (i = 0; environ[i] != NULL; ++i) {
+ if (strncmp(env_names[j], environ[i], len) == 0 &&
+ environ[i][len] == '=') {
+ if (pam_putenv(pamh, environ[i]) != PAM_SUCCESS)
+ return ERR_PAM_PUTENV;
+ }
+ }
+ }
+
+ return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+ pam_handle_t *pamh = NULL;
+ int retval;
+ int ev = 0;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s <user-name>\n", argv[0]);
+ return ERR_USAGE;
+ }
+
+ retval = pam_start("ssh-keycat", argv[1], &conv, &pamh);
+ if (retval != PAM_SUCCESS) {
+ return ERR_PAM_START;
+ }
+
+ ev = set_pam_environment(pamh);
+ if (ev != 0)
+ goto finish;
+
+ retval = pam_open_session(pamh, PAM_SILENT);
+ if (retval != PAM_SUCCESS) {
+ ev = ERR_OPEN_SESSION;
+ goto finish;
+ }
+
+ ev = dump_keys(argv[1]);
+
+ retval = pam_close_session(pamh, PAM_SILENT);
+ if (retval != PAM_SUCCESS) {
+ ev = ERR_CLOSE_SESSION;
+ }
+
+finish:
+ retval = pam_end (pamh,retval);
+ if (retval != PAM_SUCCESS) {
+ ev = ERR_PAM_END;
+ }
+ return ev;
+}
diff --git a/configure.ac b/configure.ac
index 3bbccfd..6481f1f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2952,6 +2952,7 @@ AC_ARG_WITH([pam],
PAM_MSG="yes"
SSHDLIBS="$SSHDLIBS -lpam"
+ KEYCATLIBS="$KEYCATLIBS -lpam"
AC_DEFINE([USE_PAM], [1],
[Define if you want to enable PAM support])
@@ -3105,6 +3106,7 @@
;;
*)
SSHDLIBS="$SSHDLIBS -ldl"
+ KEYCATLIBS="$KEYCATLIBS -ldl"
;;
esac
fi
@@ -4042,6 +4044,7 @@ AC_ARG_WITH([selinux],
fi ]
)
AC_SUBST([SSHDLIBS])
+AC_SUBST([KEYCATLIBS])
# Check whether user wants Kerberos 5 support
KRB5_MSG="no"
@@ -5031,6 +5034,9 @@ fi
if test ! -z "${SSHDLIBS}"; then
echo " +for sshd: ${SSHDLIBS}"
fi
+if test ! -z "${KEYCATLIBS}"; then
+echo " +for ssh-keycat: ${KEYCATLIBS}"
+fi
echo ""

View File

@ -0,0 +1,31 @@
diff -up openssh-8.2p1/authfile.c.keyperm openssh-8.2p1/authfile.c
--- openssh-8.2p1/authfile.c.keyperm 2020-02-14 01:40:54.000000000 +0100
+++ openssh-8.2p1/authfile.c 2020-02-17 11:55:12.841729758 +0100
@@ -31,6 +31,7 @@
#include <errno.h>
#include <fcntl.h>
+#include <grp.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
@@ -101,7 +102,19 @@ sshkey_perm_ok(int fd, const char *filen
#ifdef HAVE_CYGWIN
if (check_ntsec(filename))
#endif
+
if ((st.st_uid == getuid()) && (st.st_mode & 077) != 0) {
+ if (st.st_mode & 040) {
+ struct group *gr;
+
+ if ((gr = getgrnam("ssh_keys")) && (st.st_gid == gr->gr_gid)) {
+ /* The only additional bit is read
+ * for ssh_keys group, which is fine */
+ if ((st.st_mode & 077) == 040 ) {
+ return 0;
+ }
+ }
+ }
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");

View File

@ -0,0 +1,289 @@
diff -up openssh-7.4p1/auth-krb5.c.kuserok openssh-7.4p1/auth-krb5.c
--- openssh-7.4p1/auth-krb5.c.kuserok 2016-12-23 14:36:07.640465939 +0100
+++ openssh-7.4p1/auth-krb5.c 2016-12-23 14:36:07.644465936 +0100
@@ -56,6 +56,21 @@
extern ServerOptions options;
+int
+ssh_krb5_kuserok(krb5_context krb5_ctx, krb5_principal krb5_user, const char *client,
+ int k5login_exists)
+{
+ if (options.use_kuserok || !k5login_exists)
+ return krb5_kuserok(krb5_ctx, krb5_user, client);
+ else {
+ char kuser[65];
+
+ if (krb5_aname_to_localname(krb5_ctx, krb5_user, sizeof(kuser), kuser))
+ return 0;
+ return strcmp(kuser, client) == 0;
+ }
+}
+
static int
krb5_init(void *context)
{
@@ -160,8 +175,9 @@ auth_krb5_password(Authctxt *authctxt, c
if (problem)
goto out;
- if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
- authctxt->pw->pw_name)) {
+ /* Use !options.use_kuserok here to make ssh_krb5_kuserok() not
+ * depend on the existance of .k5login */
+ if (!ssh_krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, authctxt->pw->pw_name, !options.use_kuserok)) {
problem = -1;
goto out;
}
diff -up openssh-7.4p1/gss-serv-krb5.c.kuserok openssh-7.4p1/gss-serv-krb5.c
--- openssh-7.4p1/gss-serv-krb5.c.kuserok 2016-12-23 14:36:07.640465939 +0100
+++ openssh-7.4p1/gss-serv-krb5.c 2016-12-23 14:36:07.644465936 +0100
@@ -67,6 +67,7 @@ static int ssh_gssapi_krb5_cmdok(krb5_pr
int);
static krb5_context krb_context = NULL;
+extern int ssh_krb5_kuserok(krb5_context, krb5_principal, const char *, int);
/* Initialise the krb5 library, for the stuff that GSSAPI won't do */
@@ -92,6 +93,103 @@ ssh_gssapi_krb5_init(void)
* Returns true if the user is OK to log in, otherwise returns 0
*/
+/* The purpose of the function is to find out if a Kerberos principal is
+ * allowed to log in as the given local user. This is a general problem with
+ * Kerberized services because by design the Kerberos principals are
+ * completely independent from the local user names. This is one of the
+ * reasons why Kerberos is working well on different operating systems like
+ * Windows and UNIX/Linux. Nevertheless a relationship between a Kerberos
+ * principal and a local user name must be established because otherwise every
+ * access would be granted for every principal with a valid ticket.
+ *
+ * Since it is a general issue libkrb5 provides some functions for
+ * applications to find out about the relationship between the Kerberos
+ * principal and a local user name. They are krb5_kuserok() and
+ * krb5_aname_to_localname().
+ *
+ * krb5_kuserok() can be used to "Determine if a principal is authorized to
+ * log in as a local user" (from the MIT Kerberos documentation of this
+ * function). Which is exactly what we are looking for and should be the
+ * preferred choice. It accepts the Kerberos principal and a local user name
+ * and let libkrb5 or its plugins determine if they relate to each other or
+ * not.
+ *
+ * krb5_aname_to_localname() can use used to "Convert a principal name to a
+ * local name" (from the MIT Kerberos documentation of this function). It
+ * accepts a Kerberos principle and returns a local name and it is up to the
+ * application to do any additional checks. There are two issues using
+ * krb5_aname_to_localname(). First, since POSIX user names are case
+ * sensitive, the calling application in general has no other choice than
+ * doing a case-sensitive string comparison between the name returned by
+ * krb5_aname_to_localname() and the name used at the login prompt. When the
+ * users are provided by a case in-sensitive server, e.g. Active Directory,
+ * this might lead to login failures because the user typing the name at the
+ * login prompt might not be aware of the right case. Another issue might be
+ * caused if there are multiple alias names available for a single user. E.g.