Unbreak corner cases of sshd_config include
This commit is contained in:
Jakub Jelen
parent
169fdb8814
commit
efd1b7e5c8
227
openssh-8.3p1-sshd_include.patch
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227
openssh-8.3p1-sshd_include.patch
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@ -0,0 +1,227 @@
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From 3caa40f40c7f97ecf46969e050e530338864033e Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Mon, 25 May 2020 15:46:51 +0200
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Subject: [PATCH 1/3] regress: Add more test cases
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---
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regress/servcfginclude.sh | 36 +++++++++++++++++++++++++++++++++++-
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1 file changed, 35 insertions(+), 1 deletion(-)
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diff --git a/regress/servcfginclude.sh b/regress/servcfginclude.sh
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index b25c8faa..b6a9a248 100644
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--- a/regress/servcfginclude.sh
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+++ b/regress/servcfginclude.sh
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@@ -146,9 +146,43 @@ Include
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_EOF
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trace "disallow invalid with no argument"
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-${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i.x \
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+${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i.x -T \
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-C "host=x,user=test,addr=127.0.0.1" 2>/dev/null && \
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fail "sshd allowed Include with no argument"
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+# Ensure the Include before any Match block works as expected (bug #3122)
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+cat > $OBJ/sshd_config.i << _EOF
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+Banner /xx
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+HostKey $OBJ/host.ssh-ed25519
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+Include $OBJ/sshd_config.i.2
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+Match host a
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+ Banner /aaaa
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+_EOF
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+cat > $OBJ/sshd_config.i.2 << _EOF
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+Match host a
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+ Banner /aa
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+_EOF
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+
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+trace "Include before match blocks"
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+trial a /aa "included file before match blocks is properly evaluated"
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+
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+# Port in included file is correctly interpretted (bug #3169)
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+cat > $OBJ/sshd_config.i << _EOF
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+Include $OBJ/sshd_config.i.2
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+Port 7722
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+_EOF
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+cat > $OBJ/sshd_config.i.2 << _EOF
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+HostKey $OBJ/host.ssh-ed25519
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+_EOF
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+
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+trace "Port after included files"
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+${SUDO} ${REAL_SSHD} -f $OBJ/sshd_config.i -T \
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+ -C "host=x,user=test,addr=127.0.0.1" > $OBJ/sshd_config.out || \
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+ fail "failed to parse Port after included files"
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+_port=`grep -i '^port ' $OBJ/sshd_config.out | awk '{print $2}'`
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+if test "x7722" != "x$_port" ; then
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+ fail "The Port in included file was intertepretted wrongly. Expected 7722, got $_port"
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+fi
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+
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# cleanup
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rm -f $OBJ/sshd_config.i $OBJ/sshd_config.i.* $OBJ/sshd_config.out
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--
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2.25.4
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From 924922fcb8f34fb4a156367de2ee33ad92a68a6a Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Mon, 25 May 2020 16:56:39 +0200
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Subject: [PATCH 2/3] Do not call process_queued_listen_addrs() for every
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included file
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Fixes #3169
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---
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servconf.c | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/servconf.c b/servconf.c
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index 5bb4b1f8..78a7d87d 100644
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--- a/servconf.c
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+++ b/servconf.c
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@@ -74,7 +74,7 @@ static void add_listen_addr(ServerOptions *, const char *,
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const char *, int);
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static void add_one_listen_addr(ServerOptions *, const char *,
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const char *, int);
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-void parse_server_config_depth(ServerOptions *options, const char *filename,
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+static void parse_server_config_depth(ServerOptions *options, const char *filename,
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struct sshbuf *conf, struct include_list *includes,
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struct connection_info *connectinfo, int flags, int *activep, int depth);
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@@ -2580,7 +2580,7 @@ copy_set_server_options(ServerOptions *dst, ServerOptions *src, int preauth)
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#undef M_CP_STRARRAYOPT
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#define SERVCONF_MAX_DEPTH 16
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-void
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+static void
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parse_server_config_depth(ServerOptions *options, const char *filename,
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struct sshbuf *conf, struct include_list *includes,
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struct connection_info *connectinfo, int flags, int *activep, int depth)
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@@ -2606,7 +2606,6 @@ parse_server_config_depth(ServerOptions *options, const char *filename,
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if (bad_options > 0)
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fatal("%s: terminating, %d bad configuration options",
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filename, bad_options);
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- process_queued_listen_addrs(options);
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}
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void
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@@ -2617,6 +2616,7 @@ parse_server_config(ServerOptions *options, const char *filename,
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int active = connectinfo ? 0 : 1;
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parse_server_config_depth(options, filename, conf, includes,
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connectinfo, 0, &active, 0);
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+ process_queued_listen_addrs(options);
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}
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static const char *
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--
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2.25.4
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From 26d970b4fb373cb7bd99286e41dd095cd1eadbd0 Mon Sep 17 00:00:00 2001
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From: Jakub Jelen <jjelen@redhat.com>
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Date: Tue, 26 May 2020 16:25:24 +0200
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Subject: [PATCH 3/3] servconf: Fix parsing of Match blocks in included files
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(#3122)
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---
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servconf.c | 28 +++++++++++++++++++---------
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1 file changed, 19 insertions(+), 9 deletions(-)
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diff --git a/servconf.c b/servconf.c
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index 78a7d87d..a8541514 100644
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--- a/servconf.c
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+++ b/servconf.c
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@@ -554,6 +554,7 @@ typedef enum {
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#define SSHCFG_MATCH 0x02 /* allowed inside a Match section */
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#define SSHCFG_ALL (SSHCFG_GLOBAL|SSHCFG_MATCH)
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#define SSHCFG_NEVERMATCH 0x04 /* Match never matches; internal only */
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+#define SSHCFG_MATCH_ONLY 0x08 /* Match only in conditional blocks; internal only */
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/* Textual representation of the tokens. */
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static struct {
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@@ -1265,7 +1266,7 @@ static const struct multistate multistate_tcpfwd[] = {
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static int
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process_server_config_line_depth(ServerOptions *options, char *line,
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const char *filename, int linenum, int *activep,
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- struct connection_info *connectinfo, int inc_flags, int depth,
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+ struct connection_info *connectinfo, int *inc_flags, int depth,
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struct include_list *includes)
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{
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char ch, *cp, ***chararrayptr, **charptr, *arg, *arg2, *p;
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@@ -2012,7 +2013,9 @@ process_server_config_line_depth(ServerOptions *options, char *line,
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parse_server_config_depth(options,
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item->filename, item->contents,
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includes, connectinfo,
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- (oactive ? 0 : SSHCFG_NEVERMATCH),
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+ (*inc_flags & SSHCFG_MATCH_ONLY
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+ ? SSHCFG_MATCH_ONLY : (oactive
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+ ? 0 : SSHCFG_NEVERMATCH)),
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activep, depth + 1);
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}
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found = 1;
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@@ -2060,7 +2063,9 @@ process_server_config_line_depth(ServerOptions *options, char *line,
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parse_server_config_depth(options,
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item->filename, item->contents,
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includes, connectinfo,
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- (oactive ? 0 : SSHCFG_NEVERMATCH),
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+ (*inc_flags & SSHCFG_MATCH_ONLY
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+ ? SSHCFG_MATCH_ONLY : (oactive
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+ ? 0 : SSHCFG_NEVERMATCH)),
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activep, depth + 1);
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*activep = oactive;
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TAILQ_INSERT_TAIL(includes, item, entry);
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@@ -2078,11 +2083,14 @@ process_server_config_line_depth(ServerOptions *options, char *line,
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if (cmdline)
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fatal("Match directive not supported as a command-line "
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"option");
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- value = match_cfg_line(&cp, linenum, connectinfo);
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+ value = match_cfg_line(&cp, linenum,
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+ (*inc_flags & SSHCFG_NEVERMATCH ? NULL : connectinfo));
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if (value < 0)
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fatal("%s line %d: Bad Match condition", filename,
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linenum);
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- *activep = (inc_flags & SSHCFG_NEVERMATCH) ? 0 : value;
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+ *activep = (*inc_flags & SSHCFG_NEVERMATCH) ? 0 : value;
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+ /* The MATCH_ONLY is applicable only until the first match block */
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+ *inc_flags &= ~SSHCFG_MATCH_ONLY;
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break;
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case sKerberosUseKuserok:
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@@ -2385,8 +2393,9 @@ process_server_config_line(ServerOptions *options, char *line,
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const char *filename, int linenum, int *activep,
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struct connection_info *connectinfo, struct include_list *includes)
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{
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+ int inc_flags = 0;
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return process_server_config_line_depth(options, line, filename,
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- linenum, activep, connectinfo, 0, 0, includes);
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+ linenum, activep, connectinfo, &inc_flags, 0, includes);
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}
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@@ -2591,14 +2600,15 @@ parse_server_config_depth(ServerOptions *options, const char *filename,
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if (depth < 0 || depth > SERVCONF_MAX_DEPTH)
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fatal("Too many recursive configuration includes");
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- debug2("%s: config %s len %zu", __func__, filename, sshbuf_len(conf));
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+ debug2("%s: config %s len %zu%s", __func__, filename, sshbuf_len(conf),
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+ (flags & SSHCFG_NEVERMATCH ? " [checking syntax only]" : ""));
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if ((obuf = cbuf = sshbuf_dup_string(conf)) == NULL)
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fatal("%s: sshbuf_dup_string failed", __func__);
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linenum = 1;
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while ((cp = strsep(&cbuf, "\n")) != NULL) {
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if (process_server_config_line_depth(options, cp,
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- filename, linenum++, activep, connectinfo, flags,
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+ filename, linenum++, activep, connectinfo, &flags,
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depth, includes) != 0)
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bad_options++;
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}
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@@ -2615,7 +2625,7 @@ parse_server_config(ServerOptions *options, const char *filename,
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{
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int active = connectinfo ? 0 : 1;
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parse_server_config_depth(options, filename, conf, includes,
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- connectinfo, 0, &active, 0);
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+ connectinfo, (connectinfo ? SSHCFG_MATCH_ONLY : 0), &active, 0);
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process_queued_listen_addrs(options);
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}
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--
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2.25.4
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@ -215,6 +215,8 @@ Patch964: openssh-8.0p1-openssl-kdf.patch
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Patch965: openssh-8.2p1-visibility.patch
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# Do not break X11 without IPv6
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Patch966: openssh-8.2p1-x11-without-ipv6.patch
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# Unbreak sshd_config include corner cases (#3122)
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Patch967: openssh-8.3p1-sshd_include.patch
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License: BSD
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Requires: /sbin/nologin
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@ -415,6 +417,7 @@ popd
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%patch964 -p1 -b .openssl-kdf
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%patch965 -p1 -b .visibility
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%patch966 -p1 -b .x11-ipv6
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%patch967 -p1 -b .include
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%patch200 -p1 -b .audit
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%patch201 -p1 -b .audit-race
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