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authorJay Satiro <raysatiro@yahoo.com>2020-01-07 19:44:51 -0500
committerJay Satiro <raysatiro@yahoo.com>2020-01-09 14:24:53 -0500
commit4027bd72d9f0add0135e08cc7e1860cc1385f21f (patch)
treee9f9e442912d7d3e5f6918d3dc4503a66a885fb7 /src/tool_dirhie.c
parent446665606c3db116c02a68dac0b5a0626c517bf7 (diff)
downloadcurl-4027bd72d9f0add0135e08cc7e1860cc1385f21f.tar.gz
tool_dirhie: Allow directory traversal during creation
- When creating a directory hierarchy do not error when mkdir fails due to error EACCESS (13) "access denied". Some file systems allow for directory traversal; in this case that it should be possible to create child directories when permission to the parent directory is restricted. This is a regression caused by me in f16bed0 (precedes curl-7_61_1). Basically I had assumed that if a directory already existed it would fail only with error EEXIST, and not error EACCES. The latter may happen if the directory exists but has certain restricted permissions. Reported-by: mbeifuss@users.noreply.github.com Fixes https://github.com/curl/curl/issues/4796 Closes https://github.com/curl/curl/pull/4797
Diffstat (limited to 'src/tool_dirhie.c')
-rw-r--r--src/tool_dirhie.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/src/tool_dirhie.c b/src/tool_dirhie.c
index 06b3c03e8..a55503995 100644
--- a/src/tool_dirhie.c
+++ b/src/tool_dirhie.c
@@ -125,6 +125,7 @@ CURLcode create_dir_hierarchy(const char *outfile, FILE *errors)
tempdir = strtok(outdup, PATH_DELIMITERS);
while(tempdir != NULL) {
+ bool skip = false;
tempdir2 = strtok(NULL, PATH_DELIMITERS);
/* since strtok returns a token for the last word even
if not ending with DIR_CHAR, we need to prune it */
@@ -133,13 +134,27 @@ CURLcode create_dir_hierarchy(const char *outfile, FILE *errors)
if(dlen)
msnprintf(&dirbuildup[dlen], outlen - dlen, "%s%s", DIR_CHAR, tempdir);
else {
- if(outdup == tempdir)
+ if(outdup == tempdir) {
+#if defined(MSDOS) || defined(WIN32)
+ /* Skip creating a drive's current directory.
+ It may seem as though that would harmlessly fail but it could be
+ a corner case if X: did not exist, since we would be creating it
+ erroneously.
+ eg if outfile is X:\foo\bar\filename then don't mkdir X:
+ This logic takes into account unsupported drives !:, 1:, etc. */
+ char *p = strchr(tempdir, ':');
+ if(p && !p[1])
+ skip = true;
+#endif
/* the output string doesn't start with a separator */
strcpy(dirbuildup, tempdir);
+ }
else
msnprintf(dirbuildup, outlen, "%s%s", DIR_CHAR, tempdir);
}
- if((-1 == mkdir(dirbuildup, (mode_t)0000750)) && (errno != EEXIST)) {
+ /* Create directory. Ignore access denied error to allow traversal. */
+ if(!skip && (-1 == mkdir(dirbuildup, (mode_t)0000750)) &&
+ (errno != EACCES) && (errno != EEXIST)) {
show_dir_errno(errors, dirbuildup);
result = CURLE_WRITE_ERROR;
break; /* get out of loop */