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-rw-r--r--debian/patches/scp-handle-braces.patch353
1 files changed, 353 insertions, 0 deletions
diff --git a/debian/patches/scp-handle-braces.patch b/debian/patches/scp-handle-braces.patch
new file mode 100644
index 0000000..0cbdcfd
--- /dev/null
+++ b/debian/patches/scp-handle-braces.patch
@@ -0,0 +1,353 @@
+From 7a3fa37583d4abf128f7f4c6eb1e7ffc90115eab Mon Sep 17 00:00:00 2001
+From: "djm@openbsd.org" <djm@openbsd.org>
+Date: Sun, 10 Feb 2019 11:15:52 +0000
+Subject: upstream: when checking that filenames sent by the server side
+
+match what the client requested, be prepared to handle shell-style brace
+alternations, e.g. "{foo,bar}".
+
+"looks good to me" millert@ + in snaps for the last week courtesy
+deraadt@
+
+OpenBSD-Commit-ID: 3b1ce7639b0b25b2248e3a30f561a548f6815f3e
+
+Origin: upstream, https://anongit.mindrot.org/openssh.git/commit/?id=3d896c157c722bc47adca51a58dca859225b5874
+Bug-Debian: https://bugs.debian.org/923486
+Last-Update: 2019-03-01
+
+Patch-Name: scp-handle-braces.patch
+---
+ scp.c | 280 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---
+ 1 file changed, 269 insertions(+), 11 deletions(-)
+
+diff --git a/scp.c b/scp.c
+index 035037bcc..3888baab0 100644
+--- a/scp.c
++++ b/scp.c
+@@ -635,6 +635,253 @@ parse_scp_uri(const char *uri, char **userp, char **hostp, int *portp,
+ return r;
+ }
+
++/* Appends a string to an array; returns 0 on success, -1 on alloc failure */
++static int
++append(char *cp, char ***ap, size_t *np)
++{
++ char **tmp;
++
++ if ((tmp = reallocarray(*ap, *np + 1, sizeof(*tmp))) == NULL)
++ return -1;
++ tmp[(*np)] = cp;
++ (*np)++;
++ *ap = tmp;
++ return 0;
++}
++
++/*
++ * Finds the start and end of the first brace pair in the pattern.
++ * returns 0 on success or -1 for invalid patterns.
++ */
++static int
++find_brace(const char *pattern, int *startp, int *endp)
++{
++ int i;
++ int in_bracket, brace_level;
++
++ *startp = *endp = -1;
++ in_bracket = brace_level = 0;
++ for (i = 0; i < INT_MAX && *endp < 0 && pattern[i] != '\0'; i++) {
++ switch (pattern[i]) {
++ case '\\':
++ /* skip next character */
++ if (pattern[i + 1] != '\0')
++ i++;
++ break;
++ case '[':
++ in_bracket = 1;
++ break;
++ case ']':
++ in_bracket = 0;
++ break;
++ case '{':
++ if (in_bracket)
++ break;
++ if (pattern[i + 1] == '}') {
++ /* Protect a single {}, for find(1), like csh */
++ i++; /* skip */
++ break;
++ }
++ if (*startp == -1)
++ *startp = i;
++ brace_level++;
++ break;
++ case '}':
++ if (in_bracket)
++ break;
++ if (*startp < 0) {
++ /* Unbalanced brace */
++ return -1;
++ }
++ if (--brace_level <= 0)
++ *endp = i;
++ break;
++ }
++ }
++ /* unbalanced brackets/braces */
++ if (*endp < 0 && (*startp >= 0 || in_bracket))
++ return -1;
++ return 0;
++}
++
++/*
++ * Assembles and records a successfully-expanded pattern, returns -1 on
++ * alloc failure.
++ */
++static int
++emit_expansion(const char *pattern, int brace_start, int brace_end,
++ int sel_start, int sel_end, char ***patternsp, size_t *npatternsp)
++{
++ char *cp;
++ int o = 0, tail_len = strlen(pattern + brace_end + 1);
++
++ if ((cp = malloc(brace_start + (sel_end - sel_start) +
++ tail_len + 1)) == NULL)
++ return -1;
++
++ /* Pattern before initial brace */
++ if (brace_start > 0) {
++ memcpy(cp, pattern, brace_start);
++ o = brace_start;
++ }
++ /* Current braced selection */
++ if (sel_end - sel_start > 0) {
++ memcpy(cp + o, pattern + sel_start,
++ sel_end - sel_start);
++ o += sel_end - sel_start;
++ }
++ /* Remainder of pattern after closing brace */
++ if (tail_len > 0) {
++ memcpy(cp + o, pattern + brace_end + 1, tail_len);
++ o += tail_len;
++ }
++ cp[o] = '\0';
++ if (append(cp, patternsp, npatternsp) != 0) {
++ free(cp);
++ return -1;
++ }
++ return 0;
++}
++
++/*
++ * Expand the first encountered brace in pattern, appending the expanded
++ * patterns it yielded to the *patternsp array.
++ *
++ * Returns 0 on success or -1 on allocation failure.
++ *
++ * Signals whether expansion was performed via *expanded and whether
++ * pattern was invalid via *invalid.
++ */
++static int
++brace_expand_one(const char *pattern, char ***patternsp, size_t *npatternsp,
++ int *expanded, int *invalid)
++{
++ int i;
++ int in_bracket, brace_start, brace_end, brace_level;
++ int sel_start, sel_end;
++
++ *invalid = *expanded = 0;
++
++ if (find_brace(pattern, &brace_start, &brace_end) != 0) {
++ *invalid = 1;
++ return 0;
++ } else if (brace_start == -1)
++ return 0;
++
++ in_bracket = brace_level = 0;
++ for (i = sel_start = brace_start + 1; i < brace_end; i++) {
++ switch (pattern[i]) {
++ case '{':
++ if (in_bracket)
++ break;
++ brace_level++;
++ break;
++ case '}':
++ if (in_bracket)
++ break;
++ brace_level--;
++ break;
++ case '[':
++ in_bracket = 1;
++ break;
++ case ']':
++ in_bracket = 0;
++ break;
++ case '\\':
++ if (i < brace_end - 1)
++ i++; /* skip */
++ break;
++ }
++ if (pattern[i] == ',' || i == brace_end - 1) {
++ if (in_bracket || brace_level > 0)
++ continue;
++ /* End of a selection, emit an expanded pattern */
++
++ /* Adjust end index for last selection */
++ sel_end = (i == brace_end - 1) ? brace_end : i;
++ if (emit_expansion(pattern, brace_start, brace_end,
++ sel_start, sel_end, patternsp, npatternsp) != 0)
++ return -1;
++ /* move on to the next selection */
++ sel_start = i + 1;
++ continue;
++ }
++ }
++ if (in_bracket || brace_level > 0) {
++ *invalid = 1;
++ return 0;
++ }
++ /* success */
++ *expanded = 1;
++ return 0;
++}
++
++/* Expand braces from pattern. Returns 0 on success, -1 on failure */
++static int
++brace_expand(const char *pattern, char ***patternsp, size_t *npatternsp)
++{
++ char *cp, *cp2, **active = NULL, **done = NULL;
++ size_t i, nactive = 0, ndone = 0;
++ int ret = -1, invalid = 0, expanded = 0;
++
++ *patternsp = NULL;
++ *npatternsp = 0;
++
++ /* Start the worklist with the original pattern */
++ if ((cp = strdup(pattern)) == NULL)
++ return -1;
++ if (append(cp, &active, &nactive) != 0) {
++ free(cp);
++ return -1;
++ }
++ while (nactive > 0) {
++ cp = active[nactive - 1];
++ nactive--;
++ if (brace_expand_one(cp, &active, &nactive,
++ &expanded, &invalid) == -1) {
++ free(cp);
++ goto fail;
++ }
++ if (invalid)
++ fatal("%s: invalid brace pattern \"%s\"", __func__, cp);
++ if (expanded) {
++ /*
++ * Current entry expanded to new entries on the
++ * active list; discard the progenitor pattern.
++ */
++ free(cp);
++ continue;
++ }
++ /*
++ * Pattern did not expand; append the finename component to
++ * the completed list
++ */
++ if ((cp2 = strrchr(cp, '/')) != NULL)
++ *cp2++ = '\0';
++ else
++ cp2 = cp;
++ if (append(xstrdup(cp2), &done, &ndone) != 0) {
++ free(cp);
++ goto fail;
++ }
++ free(cp);
++ }
++ /* success */
++ *patternsp = done;
++ *npatternsp = ndone;
++ done = NULL;
++ ndone = 0;
++ ret = 0;
++ fail:
++ for (i = 0; i < nactive; i++)
++ free(active[i]);
++ free(active);
++ for (i = 0; i < ndone; i++)
++ free(done[i]);
++ free(done);
++ return ret;
++}
++
+ void
+ toremote(int argc, char **argv)
+ {
+@@ -998,7 +1245,8 @@ sink(int argc, char **argv, const char *src)
+ 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;
++ char **patterns = NULL;
++ size_t n, npatterns = 0;
+ struct timeval tv[2];
+
+ #define atime tv[0]
+@@ -1028,16 +1276,13 @@ sink(int argc, char **argv, const char *src)
+ * 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';
+- }
++ if (brace_expand(src, &patterns, &npatterns) != 0)
++ fatal("%s: could not expand pattern", __func__);
+ }
+ for (first = 1;; first = 0) {
+ cp = buf;
+ if (atomicio(read, remin, cp, 1) != 1)
+- return;
++ goto done;
+ if (*cp++ == '\n')
+ SCREWUP("unexpected <newline>");
+ do {
+@@ -1063,7 +1308,7 @@ sink(int argc, char **argv, const char *src)
+ }
+ if (buf[0] == 'E') {
+ (void) atomicio(vwrite, remout, "", 1);
+- return;
++ goto done;
+ }
+ if (ch == '\n')
+ *--cp = 0;
+@@ -1138,9 +1383,14 @@ sink(int argc, char **argv, const char *src)
+ 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 (npatterns > 0) {
++ for (n = 0; n < npatterns; n++) {
++ if (fnmatch(patterns[n], cp, 0) == 0)
++ break;
++ }
++ if (n >= npatterns)
++ SCREWUP("filename does not match request");
++ }
+ if (targisdir) {
+ static char *namebuf;
+ static size_t cursize;
+@@ -1299,7 +1549,15 @@ bad: run_err("%s: %s", np, strerror(errno));
+ break;
+ }
+ }
++done:
++ for (n = 0; n < npatterns; n++)
++ free(patterns[n]);
++ free(patterns);
++ return;
+ screwup:
++ for (n = 0; n < npatterns; n++)
++ free(patterns[n]);
++ free(patterns);
+ run_err("protocol error: %s", why);
+ exit(1);
+ }
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