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Fix check_private_dir() to work on Windows again.

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On windows, you cannot open() a directory.  So for Windows we should
just take our previous stat-based approach.

Closes bug 18392; bug not in any released Tor.
This commit is contained in:
Nick Mathewson 2016-02-25 13:31:28 -05:00
parent 1318c1611f
commit 7255b1121d
1 changed files with 38 additions and 11 deletions
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49
src/common/util.c
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@ -2059,15 +2059,14 @@ check_private_dir(const char *dirname, cpd_check_t check,
int fd;
int r;
struct stat st;
//char *f;
tor_assert(dirname);
#ifndef _WIN32
unsigned unwanted_bits = 0;
const struct passwd *pw = NULL;
uid_t running_uid;
gid_t running_gid;
#else
(void)effective_user;
#endif
/*
* Goal is to harden the implementation by removing any
@ -2078,7 +2077,6 @@ check_private_dir(const char *dirname, cpd_check_t check,
* Several suggestions taken from:
* https://developer.apple.com/library/mac/documentation/Security/Conceptual/SecureCodingGuide/Articles/RaceConditions.html
*/
tor_assert(dirname);
/* Open directory.
* O_NOFOLLOW to ensure that it does not follow symbolic links */
@ -2099,15 +2097,11 @@ check_private_dir(const char *dirname, cpd_check_t check,
/* Should we create the directory? */
if (check & CPD_CREATE) {
log_info(LD_GENERAL, "Creating directory %s", dirname);
#if defined (_WIN32)
r = mkdir(dirname);
#else
if (check & CPD_GROUP_READ) {
r = mkdir(dirname, 0750);
} else {
r = mkdir(dirname, 0700);
}
#endif
/* check for mkdir() error */
if (r) {
@ -2153,7 +2147,6 @@ check_private_dir(const char *dirname, cpd_check_t check,
return -1;
}
#ifndef _WIN32
if (effective_user) {
/* Look up the user and group information.
* If we have a problem, bail out. */
@ -2234,8 +2227,42 @@ check_private_dir(const char *dirname, cpd_check_t check,
return 0;
}
}
#endif
close(fd);
#else
/* Win32 case: we can't open() a directory. */
(void)effective_user;
char *f = tor_strdup(dirname);
clean_name_for_stat(f);
log_debug(LD_FS, "stat()ing %s", f);
r = stat(sandbox_intern_string(f), &st);
tor_free(f);
if (r) {
if (errno != ENOENT) {
log_warn(LD_FS, "Directory %s cannot be read: %s", dirname,
strerror(errno));
return -1;
}
if (check & CPD_CREATE) {
log_info(LD_GENERAL, "Creating directory %s", dirname);
r = mkdir(dirname);
if (r) {
log_warn(LD_FS, "Error creating directory %s: %s", dirname,
strerror(errno));
return -1;
}
} else if (!(check & CPD_CHECK)) {
log_warn(LD_FS, "Directory %s does not exist.", dirname);
return -1;
}
return 0;
}
if (!(st.st_mode & S_IFDIR)) {
log_warn(LD_FS, "%s is not a directory", dirname);
return -1;
}
#endif
return 0;
}