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upstream: Allow "SendEnv -PATTERN" to clear environment variables 

previously labeled for sendind. bz#1285 ok dtucker@

OpenBSD-Commit-ID: f6fec9e3d0f366f15903094fbe1754cb359a0df9
This commit is contained in:
djm@openbsd.org 2018-04-06 13:02:39 +00:00 committed by Damien Miller
parent 40f5f03544
commit 555294a727
2 changed files with 50 additions and 9 deletions
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48
readconf.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: readconf.c,v 1.285 2018/04/06 03:51:27 djm Exp $ */
/* $OpenBSD: readconf.c,v 1.286 2018/04/06 13:02:39 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -684,6 +684,35 @@ match_cfg_line(Options *options, char **condition, struct passwd *pw,
return result;
}
/* Remove environment variable by pattern */
static void
rm_env(Options *options, const char *arg, const char *filename, int linenum)
{
int i, j;
char *cp;
/* Remove an environment variable */
for (i = 0; i < options->num_send_env; ) {
cp = xstrdup(options->send_env[i]);
if (!match_pattern(cp, arg + 1)) {
free(cp);
i++;
continue;
}
debug3("%s line %d: removing environment %s",
filename, linenum, cp);
free(cp);
free(options->send_env[i]);
options->send_env[i] = NULL;
for (j = i; j < options->num_send_env - 1; j++) {
options->send_env[j] = options->send_env[j + 1];
options->send_env[j + 1] = NULL;
}
options->num_send_env--;
/* NB. don't increment i */
}
}
/*
* Returns the number of the token pointed to by cp or oBadOption.
*/
@ -1359,11 +1388,18 @@ parse_keytypes:
filename, linenum);
if (!*activep)
continue;
if (options->num_send_env >= MAX_SEND_ENV)
fatal("%s line %d: too many send env.",
filename, linenum);
options->send_env[options->num_send_env++] =
xstrdup(arg);
if (*arg == '-') {
/* Removing an env var */
rm_env(options, arg, filename, linenum);
continue;
} else {
/* Adding an env var */
if (options->num_send_env >= MAX_SEND_ENV)
fatal("%s line %d: too many send env.",
filename, linenum);
options->send_env[options->num_send_env++] =
xstrdup(arg);
}
}
break;

11
ssh_config.5
View File

@ -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 1.270 2018/04/05 22:54:28 djm Exp $
.Dd $Mdocdate: April 5 2018 $
.\" $OpenBSD: ssh_config.5,v 1.271 2018/04/06 13:02:39 djm Exp $
.Dd $Mdocdate: April 6 2018 $
.Dt SSH_CONFIG 5
.Os
.Sh NAME
@ -1394,11 +1394,16 @@ Multiple environment variables may be separated by whitespace or spread
across multiple
.Cm SendEnv
directives.
The default is not to send any environment variables.
.Pp
See
.Sx PATTERNS
for more information on patterns.
.Pp
It is possible to clear previously-set
.Cm SendEnv
variable names by prefixing patterns with
.Pa - .
The default is not to send any environment variables.
.It Cm ServerAliveCountMax
Sets the number of server alive messages (see below) which may be
sent without