- guenther@cvs.openbsd.org 2013/06/17 04:48:42

     [scp.c]
     Handle time_t values as long long's when formatting them and when
     parsing them from remote servers.
     Improve error checking in parsing of 'T' lines.

     ok dtucker@ deraadt@

1 files changed, 38 insertions, 25 deletions

diff --git a/scp.c b/scp.c
index 9b5959d44..ca7948f62 100644
--- a/scp.c
+++ b/scp.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: scp.c,v 1.175 2013/06/04 19:12:23 dtucker Exp $ */
+/* $OpenBSD: scp.c,v 1.176 2013/06/17 04:48:42 guenther Exp $ */
 /*
  * scp - secure remote copy.  This is basically patched BSD rcp which
  * uses ssh to do the data transfer (instead of using rcmd).
@@ -550,6 +550,24 @@ scpio(void *_cnt, size_t s)
         return 0;
 }
 
+static int
+do_times(int fd, int verb, const struct stat *sb)
+{
+        /* strlen(2^64) == 20; strlen(10^6) == 7 */
+        char buf[(20 + 7 + 2) * 2 + 2];
+
+        (void)snprintf(buf, sizeof(buf), "T%llu 0 %llu 0\n",
+            (unsigned long long) (sb->st_mtime < 0 ? 0 : sb->st_mtime),
+            (unsigned long long) (sb->st_atime < 0 ? 0 : sb->st_atime));
+        if (verb) {
+                fprintf(stderr, "File mtime %lld atime %lld\n",
+                    (long long)sb->st_mtime, (long long)sb->st_atime);
+                fprintf(stderr, "Sending file timestamps: %s", buf);
+        }
+        (void) atomicio(vwrite, fd, buf, strlen(buf));
+        return (response());
+}
+
 void
 toremote(char *targ, int argc, char **argv)
 {
@@ -774,21 +792,7 @@ syserr:			run_err("%s: %s", name, strerror(errno));
                         ++last;
                 curfile = last;
                 if (pflag) {
-                        /*
-                         * Make it compatible with possible future
-                         * versions expecting microseconds.
-                         */
-                        (void) snprintf(buf, sizeof buf, "T%lu 0 %lu 0\n",
-                            (u_long) (stb.st_mtime < 0 ? 0 : stb.st_mtime),
-                            (u_long) (stb.st_atime < 0 ? 0 : stb.st_atime));
-                        if (verbose_mode) {
-                                fprintf(stderr, "File mtime %ld atime %ld\n",
-                                    (long)stb.st_mtime, (long)stb.st_atime);
-                                fprintf(stderr, "Sending file timestamps: %s",
-                                    buf);
-                        }
-                        (void) atomicio(vwrite, remout, buf, strlen(buf));
-                        if (response() < 0)
+                        if (do_times(remout, verbose_mode, &stb) < 0)
                                 goto next;
                 }
 #define FILEMODEMASK    (S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO)
@@ -862,11 +866,7 @@ rsource(char *name, struct stat *statp)
         else
                 last++;
         if (pflag) {
-                (void) snprintf(path, sizeof(path), "T%lu 0 %lu 0\n",
-                    (u_long) statp->st_mtime,
-                    (u_long) statp->st_atime);
-                (void) atomicio(vwrite, remout, path, strlen(path));
-                if (response() < 0) {
+                if (do_times(remout, verbose_mode, statp) < 0) {
                         closedir(dirp);
                         return;
                 }
@@ -912,6 +912,7 @@ sink(int argc, char **argv)
         int amt, exists, first, ofd;
         mode_t mode, omode, mask;
         off_t size, statbytes;
+        unsigned long long ull;
         int setimes, targisdir, wrerrno = 0;
         char ch, *cp, *np, *targ, *why, *vect[1], buf[2048];
         struct timeval tv[2];
@@ -970,17 +971,29 @@ sink(int argc, char **argv)
                 if (*cp == 'T') {
                         setimes++;
                         cp++;
-                        mtime.tv_sec = strtol(cp, &cp, 10);
+                        if (!isdigit((unsigned char)*cp))
+                                SCREWUP("mtime.sec not present");
+                        ull = strtoull(cp, &cp, 10);
                         if (!cp || *cp++ != ' ')
                                 SCREWUP("mtime.sec not delimited");
+                        if ((time_t)ull < 0 || (time_t)ull != ull)
+                                setimes = 0;    /* out of range */
+                        mtime.tv_sec = ull;
                         mtime.tv_usec = strtol(cp, &cp, 10);
-                        if (!cp || *cp++ != ' ')
+                        if (!cp || *cp++ != ' ' || mtime.tv_usec < 0 ||
+                            mtime.tv_usec > 999999)
                                 SCREWUP("mtime.usec not delimited");
-                        atime.tv_sec = strtol(cp, &cp, 10);
+                        if (!isdigit((unsigned char)*cp))
+                                SCREWUP("atime.sec not present");
+                        ull = strtoull(cp, &cp, 10);
                         if (!cp || *cp++ != ' ')
                                 SCREWUP("atime.sec not delimited");
+                        if ((time_t)ull < 0 || (time_t)ull != ull)
+                                setimes = 0;    /* out of range */
+                        atime.tv_sec = ull;
                         atime.tv_usec = strtol(cp, &cp, 10);
-                        if (!cp || *cp++ != '\0')
+                        if (!cp || *cp++ != '\0' || atime.tv_usec < 0 ||
+                            atime.tv_usec > 999999)
                                 SCREWUP("atime.usec not delimited");
                         (void) atomicio(vwrite, remout, "", 1);
                         continue;