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-rw-r--r--package/openssh/0003-upstream-check-in-scp-client-that-filenames-sent-dur.patch186
1 files changed, 186 insertions, 0 deletions
diff --git a/package/openssh/0003-upstream-check-in-scp-client-that-filenames-sent-dur.patch b/package/openssh/0003-upstream-check-in-scp-client-that-filenames-sent-dur.patch
new file mode 100644
index 0000000000..98ce5cd876
--- /dev/null
+++ b/package/openssh/0003-upstream-check-in-scp-client-that-filenames-sent-dur.patch
@@ -0,0 +1,186 @@
+From f853123eda6b279a87be48e18bbea8dec82a94f2 Mon Sep 17 00:00:00 2001
+From: "djm@openbsd.org" <djm@openbsd.org>
+Date: Sat, 26 Jan 2019 22:41:28 +0000
+Subject: [PATCH] upstream: check in scp client that filenames sent during
+
+remote->local directory copies satisfy the wildcard specified by the user.
+
+This checking provides some protection against a malicious server
+sending unexpected filenames, but it comes at a risk of rejecting wanted
+files due to differences between client and server wildcard expansion rules.
+
+For this reason, this also adds a new -T flag to disable the check.
+
+reported by Harry Sintonen
+fix approach suggested by markus@;
+has been in snaps for ~1wk courtesy deraadt@
+
+OpenBSD-Commit-ID: 00f44b50d2be8e321973f3c6d014260f8f7a8eda
+Signed-off-by: Baruch Siach <baruch@tkos.co.il>
+---
+Upstream status (openssh-portable): backported from commit 8976f1c4b2
+---
+ scp.1 | 12 +++++++++++-
+ scp.c | 37 +++++++++++++++++++++++++++++--------
+ 2 files changed, 40 insertions(+), 9 deletions(-)
+
+diff --git a/scp.1 b/scp.1
+index 0e5cc1b2d675..397e7709195a 100644
+--- a/scp.1
++++ b/scp.1
+@@ -18,7 +18,7 @@
+ .Nd secure copy (remote file copy program)
+ .Sh SYNOPSIS
+ .Nm scp
+-.Op Fl 346BCpqrv
++.Op Fl 346BCpqrTv
+ .Op Fl c Ar cipher
+ .Op Fl F Ar ssh_config
+ .Op Fl i Ar identity_file
+@@ -208,6 +208,16 @@ to use for the encrypted connection.
+ The program must understand
+ .Xr ssh 1
+ options.
++.It Fl T
++Disable strict filename checking.
++By default when copying files from a remote host to a local directory
++.Nm
++checks that the received filenames match those requested on the command-line
++to prevent the remote end from sending unexpected or unwanted files.
++Because of differences in how various operating systems and shells interpret
++filename wildcards, these checks may cause wanted files to be rejected.
++This option disables these checks at the expense of fully trusting that
++the server will not send unexpected filenames.
+ .It Fl v
+ Verbose mode.
+ Causes
+diff --git a/scp.c b/scp.c
+index 4a342a63873c..7b0a08efb274 100644
+--- a/scp.c
++++ b/scp.c
+@@ -94,6 +94,7 @@
+ #include <dirent.h>
+ #include <errno.h>
+ #include <fcntl.h>
++#include <fnmatch.h>
+ #include <limits.h>
+ #include <locale.h>
+ #include <pwd.h>
+@@ -375,14 +376,14 @@ void verifydir(char *);
+ struct passwd *pwd;
+ uid_t userid;
+ int errs, remin, remout;
+-int pflag, iamremote, iamrecursive, targetshouldbedirectory;
++int Tflag, pflag, iamremote, iamrecursive, targetshouldbedirectory;
+
+ #define CMDNEEDS 64
+ char cmd[CMDNEEDS]; /* must hold "rcp -r -p -d\0" */
+
+ int response(void);
+ void rsource(char *, struct stat *);
+-void sink(int, char *[]);
++void sink(int, char *[], const char *);
+ void source(int, char *[]);
+ void tolocal(int, char *[]);
+ void toremote(int, char *[]);
+@@ -421,8 +422,9 @@ main(int argc, char **argv)
+ addargs(&args, "-oRemoteCommand=none");
+ addargs(&args, "-oRequestTTY=no");
+
+- fflag = tflag = 0;
+- while ((ch = getopt(argc, argv, "dfl:prtvBCc:i:P:q12346S:o:F:")) != -1)
++ fflag = Tflag = tflag = 0;
++ while ((ch = getopt(argc, argv,
++ "dfl:prtTvBCc:i:P:q12346S:o:F:")) != -1) {
+ switch (ch) {
+ /* User-visible flags. */
+ case '1':
+@@ -501,9 +503,13 @@ main(int argc, char **argv)
+ setmode(0, O_BINARY);
+ #endif
+ break;
++ case 'T':
++ Tflag = 1;
++ break;
+ default:
+ usage();
+ }
++ }
+ argc -= optind;
+ argv += optind;
+
+@@ -534,7 +540,7 @@ main(int argc, char **argv)
+ }
+ if (tflag) {
+ /* Receive data. */
+- sink(argc, argv);
++ sink(argc, argv, NULL);
+ exit(errs != 0);
+ }
+ if (argc < 2)
+@@ -792,7 +798,7 @@ tolocal(int argc, char **argv)
+ continue;
+ }
+ free(bp);
+- sink(1, argv + argc - 1);
++ sink(1, argv + argc - 1, src);
+ (void) close(remin);
+ remin = remout = -1;
+ }
+@@ -968,7 +974,7 @@ rsource(char *name, struct stat *statp)
+ (sizeof(type) != 4 && sizeof(type) != 8))
+
+ void
+-sink(int argc, char **argv)
++sink(int argc, char **argv, const char *src)
+ {
+ static BUF buffer;
+ struct stat stb;
+@@ -984,6 +990,7 @@ sink(int argc, char **argv)
+ unsigned long long ull;
+ int setimes, targisdir, wrerrno = 0;
+ char ch, *cp, *np, *targ, *why, *vect[1], buf[2048], visbuf[2048];
++ char *src_copy = NULL, *restrict_pattern = NULL;
+ struct timeval tv[2];
+
+ #define atime tv[0]
+@@ -1008,6 +1015,17 @@ sink(int argc, char **argv)
+ (void) atomicio(vwrite, remout, "", 1);
+ if (stat(targ, &stb) == 0 && S_ISDIR(stb.st_mode))
+ targisdir = 1;
++ if (src != NULL && !iamrecursive && !Tflag) {
++ /*
++ * Prepare to try to restrict incoming filenames to match
++ * the requested destination file glob.
++ */
++ if ((src_copy = strdup(src)) == NULL)
++ fatal("strdup failed");
++ if ((restrict_pattern = strrchr(src_copy, '/')) != NULL) {
++ *restrict_pattern++ = '\0';
++ }
++ }
+ for (first = 1;; first = 0) {
+ cp = buf;
+ if (atomicio(read, remin, cp, 1) != 1)
+@@ -1112,6 +1130,9 @@ sink(int argc, char **argv)
+ run_err("error: unexpected filename: %s", cp);
+ exit(1);
+ }
++ if (restrict_pattern != NULL &&
++ fnmatch(restrict_pattern, cp, 0) != 0)
++ SCREWUP("filename does not match request");
+ if (targisdir) {
+ static char *namebuf;
+ static size_t cursize;
+@@ -1149,7 +1170,7 @@ sink(int argc, char **argv)
+ goto bad;
+ }
+ vect[0] = xstrdup(np);
+- sink(1, vect);
++ sink(1, vect, src);
+ if (setimes) {
+ setimes = 0;
+ if (utimes(vect[0], tv) < 0)
+--
+2.20.1
+