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https://github.com/vgough/encfs.git
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add xattr translation
This commit is contained in:
Valient Gough
parent
29c518d9d7
commit
a9975cd18d
124
encfs/encfs.cpp
124
encfs/encfs.cpp
@ -17,20 +17,25 @@
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#include "encfs.h"
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#include <cerrno>
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#include <cstddef>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <memory>
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#include <stdint.h>
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#include <string>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <sys/time.h>
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#include <time.h>
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#include <unistd.h>
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#include <utility>
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#include <utime.h>
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#include <cerrno>
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#include <cstddef>
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#include <cstdio>
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#include <cstring>
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#include <memory>
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#include <vector>
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#ifdef linux
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#include <sys/fsuid.h>
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#endif
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@ -43,9 +48,6 @@
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#include <rlog/Error.h>
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#include <rlog/rlog.h>
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#include <functional>
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#include <string>
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#include <vector>
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#include "Context.h"
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#include "DirNode.h"
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@ -60,10 +62,6 @@ namespace rlog {
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class RLogChannel;
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} // namespace rlog
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#ifndef MIN
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#define MIN(a, b) (((a) < (b)) ? (a) : (b))
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#endif
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#define ESUCCESS 0
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using namespace std;
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@ -73,6 +71,13 @@ using rel::Lock;
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#define GET_FN(ctx, finfo) ctx->getNode((void *)(uintptr_t)finfo->fh)
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// XAttr prefix replacement.
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// Replaces "com.apple." with "encfs_apl." when storing xattrs.
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// TODO: future versions of encfs should encrypt xattrs, making this
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// unnecessary.
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static const char _attr_apple[] = "com.apple.";
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static const char _attr_apple_internal[] = "encfs_apl.";
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static RLogChannel *Info = DEF_CHANNEL("info", Log_Info);
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static EncFS_Context *context() {
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@ -634,77 +639,97 @@ int encfs_statfs(const char *path, struct statvfs *st) {
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#ifdef HAVE_XATTR
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#ifdef XATTR_ADD_OPT
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typedef std::unique_ptr<const char[], std::function<void(const char *)>>
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AttrPtr;
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void NoFree(const char *) {}
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AttrPtr extToInternalAttr(const char *attr) {
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if (!strncmp(attr, _attr_apple, sizeof(_attr_apple) - 1)) {
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char *out = strdup(attr);
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memcpy(out, _attr_apple_internal, sizeof(_attr_apple_internal) - 1);
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return AttrPtr(out, (void (*)(const char *))std::free);
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} else {
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return AttrPtr(attr, NoFree);
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}
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}
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void internalToExtAttr(char *attr) {
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if (!strncmp(attr, _attr_apple_internal, sizeof(_attr_apple_internal) - 1)) {
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memcpy(attr, _attr_apple, sizeof(_attr_apple) - 1);
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}
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}
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int _do_setxattr(EncFS_Context *, const string &cyName, const char *name,
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const char *value, size_t size, uint32_t pos) {
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int options = 0;
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return ::setxattr(cyName.c_str(), name, value, size, pos, options);
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#ifdef XATTR_ADD_OPT
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return ::setxattr(cyName.c_str(), name, value, size, pos, XATTR_NOFOLLOW);
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#else
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return ::setxattr(cyName.c_str(), name, value, size, 0);
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#endif
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}
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int encfs_setxattr(const char *path, const char *name, const char *value,
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size_t size, int flags, uint32_t position) {
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size_t size, int flags, uint32_t pos) {
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if (isReadOnly(NULL)) return -EROFS;
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(void)flags;
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return withCipherPath("setxattr", path, bind(_do_setxattr, _1, _2, name,
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value, size, position));
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}
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#else
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int _do_setxattr(EncFS_Context *, const string &cyName, const char *name,
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const char *value, size_t size, int flags) {
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return ::setxattr(cyName.c_str(), name, value, size, flags);
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AttrPtr attr = extToInternalAttr(name);
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return withCipherPath("setxattr", path, bind(_do_setxattr, _1, _2, attr.get(),
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value, size, pos));
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}
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int encfs_setxattr(const char *path, const char *name, const char *value,
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size_t size, int flags) {
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if (isReadOnly(NULL)) return -EROFS;
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return withCipherPath("setxattr", path,
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bind(_do_setxattr, _1, _2, name, value, size, flags));
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return encfs_setxattr(path, name, value, size, flags, uint32_t(0));
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}
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#endif
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#ifdef XATTR_ADD_OPT
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int _do_getxattr(EncFS_Context *, const string &cyName, const char *name,
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void *value, size_t size, uint32_t pos) {
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int options = 0;
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return ::getxattr(cyName.c_str(), name, value, size, pos, options);
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#ifdef XATTR_ADD_OPT
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return ::getxattr(cyName.c_str(), name, value, size, pos, XATTR_NOFOLLOW);
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#else
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return ::getxattr(cyName.c_str(), name, value, size);
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#endif
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}
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int encfs_getxattr(const char *path, const char *name, char *value, size_t size,
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uint32_t position) {
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uint32_t pos) {
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AttrPtr attr = extToInternalAttr(name);
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return withCipherPath(
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"getxattr", path,
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bind(_do_getxattr, _1, _2, name, (void *)value, size, position), true);
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}
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#else
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int _do_getxattr(EncFS_Context *, const string &cyName, const char *name,
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void *value, size_t size) {
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return ::getxattr(cyName.c_str(), name, value, size);
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bind(_do_getxattr, _1, _2, attr.get(), (void *)value, size, pos), true);
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}
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int encfs_getxattr(const char *path, const char *name, char *value,
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size_t size) {
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return withCipherPath("getxattr", path,
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bind(_do_getxattr, _1, _2, name, (void *)value, size),
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true);
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return encfs_getxattr(path, name, value, size, uint32_t(0));
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}
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#endif
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int _do_listxattr(EncFS_Context *, const string &cyName, char *list,
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size_t size) {
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#ifdef XATTR_ADD_OPT
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int options = 0;
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int res = ::listxattr(cyName.c_str(), list, size, options);
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return ::listxattr(cyName.c_str(), list, size, XATTR_NOFOLLOW);
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#else
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int res = ::listxattr(cyName.c_str(), list, size);
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return ::listxattr(cyName.c_str(), list, size);
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#endif
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return (res == -1) ? -errno : res;
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}
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int encfs_listxattr(const char *path, char *list, size_t size) {
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return withCipherPath("listxattr", path,
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int res = withCipherPath("listxattr", path,
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bind(_do_listxattr, _1, _2, list, size), true);
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if (list) {
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size_t len = 0;
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char *curr = list;
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while (len < res) {
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internalToExtAttr(curr);
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size_t el_len = strlen(curr) + 1;
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curr += el_len;
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len += el_len;
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}
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}
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return res;
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}
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int _do_removexattr(EncFS_Context *, const string &cyName, const char *name) {
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#ifdef XATTR_ADD_OPT
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int options = 0;
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int res = ::removexattr(cyName.c_str(), name, options);
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int res = ::removexattr(cyName.c_str(), name, XATTR_NOFOLLOW);
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#else
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int res = ::removexattr(cyName.c_str(), name);
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#endif
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@ -714,8 +739,9 @@ int _do_removexattr(EncFS_Context *, const string &cyName, const char *name) {
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int encfs_removexattr(const char *path, const char *name) {
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if (isReadOnly(NULL)) return -EROFS;
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AttrPtr attr = extToInternalAttr(name);
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return withCipherPath("removexattr", path,
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bind(_do_removexattr, _1, _2, name));
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bind(_do_removexattr, _1, _2, attr.get()));
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}
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#endif // HAVE_XATTR
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