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tool_dirhie: Allow directory traversal during creation

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- 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
This commit is contained in:
Jay Satiro 2020-01-07 19:44:51 -05:00
parent 446665606c
commit 4027bd72d9
1 changed files with 17 additions and 2 deletions
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19
src/tool_dirhie.c
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@ -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 */