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[openssh] 05/06: upstream: add a SetEnv directive to ssh_config that allows setting
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Jun 8, 2018, 8:11 PM
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djm pushed a commit to branch master
in repository openssh.

commit 7082bb58a2eb878d23ec674587c742e5e9673c36
Author: djm@openbsd.org <djm@openbsd.org>
Date: Sat Jun 9 03:01:12 2018 +0000

upstream: add a SetEnv directive to ssh_config that allows setting

environment variables for the remote session (subject to the server accepting
them)

refactor SendEnv to remove the arbitrary limit of variable names.

ok markus@

OpenBSD-Commit-ID: cfbb00d9b0e10c1ffff1d83424351fd961d1f2be
---
clientloop.c | 24 +++++++++++++++++++-----
misc.c | 32 ++++++++++++++++++++++++++------
misc.h | 3 ++-
mux.c | 10 ++++++----
readconf.c | 34 +++++++++++++++++++++++++++++++---
readconf.h | 7 ++++---
scp.1 | 5 +++--
sftp.1 | 5 +++--
ssh.1 | 5 +++--
ssh_config.5 | 10 ++++++++--
sshd_config.5 | 6 ++++--
11 files changed, 109 insertions(+), 32 deletions(-)

diff --git a/clientloop.c b/clientloop.c
index 4801f4a7..247b8397 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: clientloop.c,v 1.312 2018/04/10 00:10:49 djm Exp $ */
+/* $OpenBSD: clientloop.c,v 1.313 2018/06/09 03:01:12 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -2158,7 +2158,8 @@ void
client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env)
{
- int len;
+ int i, j, matched, len;
+ char *name, *val;
Channel *c = NULL;

debug2("%s: id %d", __func__, id);
@@ -2193,9 +2194,6 @@ client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,

/* Transfer any environment variables from client to server */
if (options.num_send_env != 0 && env != NULL) {
- int i, j, matched;
- char *name, *val;
-
debug("Sending environment.");
for (i = 0; env[i] != NULL; i++) {
/* Split */
@@ -2227,6 +2225,22 @@ client_session2_setup(struct ssh *ssh, int id, int want_tty, int want_subsystem,
free(name);
}
}
+ for (i = 0; i < options.num_setenv; i++) {
+ /* Split */
+ name = xstrdup(options.setenv[i]);
+ if ((val = strchr(name, '=')) == NULL) {
+ free(name);
+ continue;
+ }
+ *val++ = '\0';
+
+ debug("Setting env %s = %s", name, val);
+ channel_request_start(ssh, id, "env", 0);
+ packet_put_cstring(name);
+ packet_put_cstring(val);
+ packet_send();
+ free(name);
+ }

len = buffer_len(cmd);
if (len > 0) {
diff --git a/misc.c b/misc.c
index 3e62320a..1198e70c 100644
--- a/misc.c
+++ b/misc.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.c,v 1.128 2018/06/06 18:29:18 markus Exp $ */
+/* $OpenBSD: misc.c,v 1.129 2018/06/09 03:01:12 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
* Copyright (c) 2005,2006 Damien Miller. All rights reserved.
@@ -239,8 +239,8 @@ set_rdomain(int fd, const char *name)
#define QUOTE "\""

/* return next token in configuration line */
-char *
-strdelim(char **s)
+static char *
+strdelim_internal(char **s, int split_equals)
{
char *old;
int wspace = 0;
@@ -250,7 +250,8 @@ strdelim(char **s)

old = *s;

- *s = strpbrk(*s, WHITESPACE QUOTE "=");
+ *s = strpbrk(*s,
+ split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
if (*s == NULL)
return (old);

@@ -267,18 +268,37 @@ strdelim(char **s)
}

/* Allow only one '=' to be skipped */
- if (*s[0] == '=')
+ if (split_equals && *s[0] == '=')
wspace = 1;
*s[0] = '\0';

/* Skip any extra whitespace after first token */
*s += strspn(*s + 1, WHITESPACE) + 1;
- if (*s[0] == '=' && !wspace)
+ if (split_equals && *s[0] == '=' && !wspace)
*s += strspn(*s + 1, WHITESPACE) + 1;

return (old);
}

+/*
+ * Return next token in configuration line; splts on whitespace or a
+ * single '=' character.
+ */
+char *
+strdelim(char **s)
+{
+ return strdelim_internal(s, 1);
+}
+
+/*
+ * Return next token in configuration line; splts on whitespace only.
+ */
+char *
+strdelimw(char **s)
+{
+ return strdelim_internal(s, 0);
+}
+
struct passwd *
pwcopy(struct passwd *pw)
{
diff --git a/misc.h b/misc.h
index daa4abc4..837b005a 100644
--- a/misc.h
+++ b/misc.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: misc.h,v 1.72 2018/06/06 18:29:18 markus Exp $ */
+/* $OpenBSD: misc.h,v 1.73 2018/06/09 03:01:12 djm Exp $ */

/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -45,6 +45,7 @@ struct ForwardOptions {

char *chop(char *);
char *strdelim(char **);
+char *strdelimw(char **);
int set_nonblock(int);
int unset_nonblock(int);
void set_nodelay(int);
diff --git a/mux.c b/mux.c
index c591cb15..8433cd8e 100644
--- a/mux.c
+++ b/mux.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mux.c,v 1.70 2018/06/06 18:22:41 djm Exp $ */
+/* $OpenBSD: mux.c,v 1.71 2018/06/09 03:01:12 djm Exp $ */
/*
* Copyright (c) 2002-2008 Damien Miller <djm@openbsd.org>
*
@@ -1852,9 +1852,9 @@ mux_client_request_session(int fd)
{
Buffer m;
char *e, *term;
- u_int i, rid, sid, esid, exitval, type, exitval_seen;
+ u_int rid, sid, esid, exitval, type, exitval_seen;
extern char **environ;
- int devnull, rawmode;
+ int i, devnull, rawmode;

debug3("%s: entering", __func__);

@@ -1889,14 +1889,16 @@ mux_client_request_session(int fd)
buffer_put_cstring(&m, term == NULL ? "" : term);
buffer_put_string(&m, buffer_ptr(&command), buffer_len(&command));

+ /* Pass environment */
if (options.num_send_env > 0 && environ != NULL) {
- /* Pass environment */
for (i = 0; environ[i] != NULL; i++) {
if (env_permitted(environ[i])) {
buffer_put_cstring(&m, environ[i]);
}
}
}
+ for (i = 0; i < options.num_setenv; i++)
+ buffer_put_cstring(&m, options.setenv[i]);

if (mux_client_write_packet(fd, &m) != 0)
fatal("%s: write packet: %s", __func__, strerror(errno));
diff --git a/readconf.c b/readconf.c
index 733b67f7..8ff23c05 100644
--- a/readconf.c
+++ b/readconf.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.c,v 1.289 2018/06/06 18:29:18 markus Exp $ */
+/* $OpenBSD: readconf.c,v 1.290 2018/06/09 03:01:12 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -161,7 +161,7 @@ typedef enum {
oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
oAddressFamily, oGssAuthentication, oGssDelegateCreds,
oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
- oSendEnv, oControlPath, oControlMaster, oControlPersist,
+ oSendEnv, oSetEnv, oControlPath, oControlMaster, oControlPersist,
oHashKnownHosts,
oTunnel, oTunnelDevice,
oLocalCommand, oPermitLocalCommand, oRemoteCommand,
@@ -277,6 +277,7 @@ static struct {
{ "serveraliveinterval", oServerAliveInterval },
{ "serveralivecountmax", oServerAliveCountMax },
{ "sendenv", oSendEnv },
+ { "setenv", oSetEnv },
{ "controlpath", oControlPath },
{ "controlmaster", oControlMaster },
{ "controlpersist", oControlPersist },
@@ -1398,15 +1399,38 @@ parse_keytypes:
continue;
} else {
/* Adding an env var */
- if (options->num_send_env >= MAX_SEND_ENV)
+ if (options->num_send_env >= INT_MAX)
fatal("%s line %d: too many send env.",
filename, linenum);
+ options->send_env = xrecallocarray(
+ options->send_env, options->num_send_env,
+ options->num_send_env,
+ sizeof(*options->send_env));
options->send_env[options->num_send_env++] =
xstrdup(arg);
}
}
break;

+ case oSetEnv:
+ value = options->num_setenv;
+ while ((arg = strdelimw(&s)) != NULL && *arg != '\0') {
+ if (strchr(arg, '=') == NULL)
+ fatal("%s line %d: Invalid SetEnv.",
+ filename, linenum);
+ if (!*activep || value != 0)
+ continue;
+ /* Adding a setenv var */
+ if (options->num_setenv >= INT_MAX)
+ fatal("%s line %d: too many SetEnv.",
+ filename, linenum);
+ options->setenv = xrecallocarray(
+ options->setenv, options->num_setenv,
+ options->num_setenv + 1, sizeof(*options->setenv));
+ options->setenv[options->num_setenv++] = xstrdup(arg);
+ }
+ break;
+
case oControlPath:
charptr = &options->control_path;
goto parse_string;
@@ -1855,7 +1879,10 @@ initialize_options(Options * options)
options->verify_host_key_dns = -1;
options->server_alive_interval = -1;
options->server_alive_count_max = -1;
+ options->send_env = NULL;
options->num_send_env = 0;
+ options->setenv = NULL;
+ options->num_setenv = 0;
options->control_path = NULL;
options->control_master = -1;
options->control_persist = -1;
@@ -2606,6 +2633,7 @@ dump_client_config(Options *o, const char *host)
dump_cfg_strarray_oneline(oGlobalKnownHostsFile, o->num_system_hostfiles, o->system_hostfiles);
dump_cfg_strarray_oneline(oUserKnownHostsFile, o->num_user_hostfiles, o->user_hostfiles);
dump_cfg_strarray(oSendEnv, o->num_send_env, o->send_env);
+ dump_cfg_strarray(oSetEnv, o->num_setenv, o->setenv);

/* Special cases */

diff --git a/readconf.h b/readconf.h
index f4d9e2b2..d8595f07 100644
--- a/readconf.h
+++ b/readconf.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: readconf.h,v 1.125 2018/02/23 02:34:33 djm Exp $ */
+/* $OpenBSD: readconf.h,v 1.126 2018/06/09 03:01:12 djm Exp $ */

/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@@ -18,7 +18,6 @@

/* Data structure for representing option data. */

-#define MAX_SEND_ENV 256
#define SSH_MAX_HOSTS_FILES 32
#define MAX_CANON_DOMAINS 32
#define PATH_MAX_SUN (sizeof((struct sockaddr_un *)0)->sun_path)
@@ -120,7 +119,9 @@ typedef struct {
int server_alive_count_max;

int num_send_env;
- char *send_env[MAX_SEND_ENV];
+ char **send_env;
+ int num_setenv;
+ char **setenv;

char *control_path;
int control_master;
diff --git a/scp.1 b/scp.1
index 8d251e34..b8886be6 100644
--- a/scp.1
+++ b/scp.1
@@ -8,9 +8,9 @@
.\"
.\" Created: Sun May 7 00:14:37 1995 ylo
.\"
-.\" $OpenBSD: scp.1,v 1.77 2018/02/23 07:38:09 jmc Exp $
+.\" $OpenBSD: scp.1,v 1.78 2018/06/09 03:01:12 djm Exp $
.\"
-.Dd $Mdocdate: February 23 2018 $
+.Dd $Mdocdate: June 9 2018 $
.Dt SCP 1
.Os
.Sh NAME
@@ -171,6 +171,7 @@ For full details of the options listed below, and their possible values, see
.It PubkeyAuthentication
.It RekeyLimit
.It SendEnv
+.It SetEnv
.It ServerAliveInterval
.It ServerAliveCountMax
.It StrictHostKeyChecking
diff --git a/sftp.1 b/sftp.1
index 43e0442f..686844b4 100644
--- a/sftp.1
+++ b/sftp.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: sftp.1,v 1.114 2018/02/23 07:38:09 jmc Exp $
+.\" $OpenBSD: sftp.1,v 1.115 2018/06/09 03:01:12 djm Exp $
.\"
.\" Copyright (c) 2001 Damien Miller. All rights reserved.
.\"
@@ -22,7 +22,7 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd $Mdocdate: February 23 2018 $
+.Dd $Mdocdate: June 9 2018 $
.Dt SFTP 1
.Os
.Sh NAME
@@ -241,6 +241,7 @@ For full details of the options listed below, and their possible values, see
.It PubkeyAuthentication
.It RekeyLimit
.It SendEnv
+.It SetEnv
.It ServerAliveInterval
.It ServerAliveCountMax
.It StrictHostKeyChecking
diff --git a/ssh.1 b/ssh.1
index 40034463..65f4e396 100644
--- a/ssh.1
+++ b/ssh.1
@@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.\" $OpenBSD: ssh.1,v 1.393 2018/05/11 04:01:11 djm Exp $
-.Dd $Mdocdate: May 11 2018 $
+.\" $OpenBSD: ssh.1,v 1.394 2018/06/09 03:01:12 djm Exp $
+.Dd $Mdocdate: June 9 2018 $
.Dt SSH 1
.Os
.Sh NAME
@@ -525,6 +525,7 @@ For full details of the options listed below, and their possible values, see
.It RemoteForward
.It RequestTTY
.It SendEnv
+.It SetEnv
.It ServerAliveInterval
.It ServerAliveCountMax
.It StreamLocalBindMask
diff --git a/ssh_config.5 b/ssh_config.5
index f6f36c45..20a60a2d 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.\" $OpenBSD: ssh_config.5,v 1.275 2018/06/01 06:23:10 jmc Exp $
-.Dd $Mdocdate: June 1 2018 $
+.\" $OpenBSD: ssh_config.5,v 1.276 2018/06/09 03:01:12 djm Exp $
+.Dd $Mdocdate: June 9 2018 $
.Dt SSH_CONFIG 5
.Os
.Sh NAME
@@ -1404,6 +1404,12 @@ It is possible to clear previously set
variable names by prefixing patterns with
.Pa - .
The default is not to send any environment variables.
+.It Cm SetEnv
+Directly specify one or more environment variables and their contents to
+be sent to the server.
+Similarly to
+.Cm SendEnv ,
+the server must be prepared to accept the environment variable.
.It Cm ServerAliveCountMax
Sets the number of server alive messages (see below) which may be
sent without
diff --git a/sshd_config.5 b/sshd_config.5
index 7cf7e63d..395f5f6a 100644
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -33,8 +33,8 @@
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
-.\" $OpenBSD: sshd_config.5,v 1.272 2018/06/07 11:26:14 jmc Exp $
-.Dd $Mdocdate: June 7 2018 $
+.\" $OpenBSD: sshd_config.5,v 1.273 2018/06/09 03:01:12 djm Exp $
+.Dd $Mdocdate: June 9 2018 $
.Dt SSHD_CONFIG 5
.Os
.Sh NAME
@@ -66,6 +66,8 @@ the session's
.Xr environ 7 .
See
.Cm SendEnv
+and
+.Cm SetEnv
in
.Xr ssh_config 5
for how to configure the client.

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