ext4 crypto: simplify and speed up filename encryption
Avoid using SHA-1 when calculating the user-visible filename when the encryption key is available, and avoid decrypting lots of filenames when searching for a directory entry in a directory block. Change-Id: If4655f144784978ba0305b597bfa1c8d7bb69e63 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
parent
6ddb244784
commit
5de0b4d0cd
@ -198,106 +198,57 @@ static int ext4_fname_decrypt(struct ext4_fname_crypto_ctx *ctx,
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return oname->len;
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}
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static const char *lookup_table =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+,";
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/**
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* ext4_fname_encode_digest() -
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*
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* Encodes the input digest using characters from the set [a-zA-Z0-9_+].
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* The encoded string is roughly 4/3 times the size of the input string.
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*/
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int ext4_fname_encode_digest(char *dst, char *src, u32 len)
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static int digest_encode(const char *src, int len, char *dst)
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{
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static const char *lookup_table =
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_+";
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u32 current_chunk, num_chunks, i;
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char tmp_buf[3];
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u32 c0, c1, c2, c3;
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int i = 0, bits = 0, ac = 0;
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char *cp = dst;
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current_chunk = 0;
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num_chunks = len/3;
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for (i = 0; i < num_chunks; i++) {
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c0 = src[3*i] & 0x3f;
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c1 = (((src[3*i]>>6)&0x3) | ((src[3*i+1] & 0xf)<<2)) & 0x3f;
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c2 = (((src[3*i+1]>>4)&0xf) | ((src[3*i+2] & 0x3)<<4)) & 0x3f;
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c3 = (src[3*i+2]>>2) & 0x3f;
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dst[4*i] = lookup_table[c0];
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dst[4*i+1] = lookup_table[c1];
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dst[4*i+2] = lookup_table[c2];
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dst[4*i+3] = lookup_table[c3];
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}
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if (i*3 < len) {
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memset(tmp_buf, 0, 3);
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memcpy(tmp_buf, &src[3*i], len-3*i);
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c0 = tmp_buf[0] & 0x3f;
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c1 = (((tmp_buf[0]>>6)&0x3) | ((tmp_buf[1] & 0xf)<<2)) & 0x3f;
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c2 = (((tmp_buf[1]>>4)&0xf) | ((tmp_buf[2] & 0x3)<<4)) & 0x3f;
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c3 = (tmp_buf[2]>>2) & 0x3f;
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dst[4*i] = lookup_table[c0];
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dst[4*i+1] = lookup_table[c1];
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dst[4*i+2] = lookup_table[c2];
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dst[4*i+3] = lookup_table[c3];
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while (i < len) {
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ac += (((unsigned char) src[i]) << bits);
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bits += 8;
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do {
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*cp++ = lookup_table[ac & 0x3f];
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ac >>= 6;
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bits -= 6;
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} while (bits >= 6);
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i++;
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}
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return (i * 4);
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if (bits)
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*cp++ = lookup_table[ac & 0x3f];
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return cp - dst;
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}
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/**
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* ext4_fname_hash() -
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*
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* This function computes the hash of the input filename, and sets the output
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* buffer to the *encoded* digest. It returns the length of the digest as its
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* return value. Errors are returned as negative numbers. We trust the caller
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* to allocate sufficient memory to oname string.
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*/
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static int ext4_fname_hash(struct ext4_fname_crypto_ctx *ctx,
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const struct ext4_str *iname,
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struct ext4_str *oname)
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static int digest_decode(const char *src, int len, char *dst)
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{
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struct scatterlist sg;
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struct hash_desc desc = {
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.tfm = (struct crypto_hash *)ctx->htfm,
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.flags = CRYPTO_TFM_REQ_MAY_SLEEP
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};
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int res = 0;
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int i = 0, bits = 0, ac = 0;
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const char *p;
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char *cp = dst;
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if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
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res = ext4_fname_encode_digest(oname->name, iname->name,
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iname->len);
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oname->len = res;
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return res;
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while (i < len) {
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p = strchr(lookup_table, src[i]);
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if (p == NULL || src[i] == 0)
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return -2;
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ac += (p - lookup_table) << bits;
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bits += 6;
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if (bits >= 8) {
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*cp++ = ac & 0xff;
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ac >>= 8;
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bits -= 8;
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}
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i++;
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}
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sg_init_one(&sg, iname->name, iname->len);
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res = crypto_hash_init(&desc);
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if (res) {
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printk(KERN_ERR
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"%s: Error initializing crypto hash; res = [%d]\n",
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__func__, res);
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goto out;
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}
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res = crypto_hash_update(&desc, &sg, iname->len);
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if (res) {
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printk(KERN_ERR
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"%s: Error updating crypto hash; res = [%d]\n",
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__func__, res);
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goto out;
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}
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res = crypto_hash_final(&desc,
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&oname->name[EXT4_FNAME_CRYPTO_DIGEST_SIZE]);
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if (res) {
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printk(KERN_ERR
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"%s: Error finalizing crypto hash; res = [%d]\n",
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__func__, res);
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goto out;
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}
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/* Encode the digest as a printable string--this will increase the
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* size of the digest */
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oname->name[0] = 'I';
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res = ext4_fname_encode_digest(oname->name+1,
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&oname->name[EXT4_FNAME_CRYPTO_DIGEST_SIZE],
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EXT4_FNAME_CRYPTO_DIGEST_SIZE) + 1;
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oname->len = res;
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out:
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return res;
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if (ac)
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return -1;
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return cp - dst;
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}
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/**
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@ -571,9 +522,13 @@ void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str)
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* ext4_fname_disk_to_usr() - converts a filename from disk space to user space
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*/
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int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
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const struct ext4_str *iname,
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struct ext4_str *oname)
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struct dx_hash_info *hinfo,
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const struct ext4_str *iname,
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struct ext4_str *oname)
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{
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char buf[24];
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int ret;
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if (ctx == NULL)
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return -EIO;
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if (iname->len < 3) {
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@ -587,18 +542,33 @@ int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
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}
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if (ctx->has_valid_key)
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return ext4_fname_decrypt(ctx, iname, oname);
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else
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return ext4_fname_hash(ctx, iname, oname);
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if (iname->len <= EXT4_FNAME_CRYPTO_DIGEST_SIZE) {
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ret = digest_encode(iname->name, iname->len, oname->name);
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oname->len = ret;
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return ret;
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}
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if (hinfo) {
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memcpy(buf, &hinfo->hash, 4);
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memcpy(buf+4, &hinfo->minor_hash, 4);
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} else
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memset(buf, 0, 8);
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memcpy(buf + 8, iname->name + iname->len - 16, 16);
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oname->name[0] = '_';
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ret = digest_encode(buf, 24, oname->name+1);
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oname->len = ret + 1;
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return ret + 1;
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}
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int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
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struct dx_hash_info *hinfo,
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const struct ext4_dir_entry_2 *de,
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struct ext4_str *oname)
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{
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struct ext4_str iname = {.name = (unsigned char *) de->name,
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.len = de->name_len };
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return _ext4_fname_disk_to_usr(ctx, &iname, oname);
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return _ext4_fname_disk_to_usr(ctx, hinfo, &iname, oname);
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}
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@ -640,10 +610,11 @@ int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
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const struct qstr *iname,
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struct dx_hash_info *hinfo)
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{
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struct ext4_str tmp, tmp2;
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struct ext4_str tmp;
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int ret = 0;
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char buf[EXT4_FNAME_CRYPTO_DIGEST_SIZE+1];
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if (!ctx || !ctx->has_valid_key ||
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if (!ctx ||
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((iname->name[0] == '.') &&
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((iname->len == 1) ||
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((iname->name[1] == '.') && (iname->len == 2))))) {
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@ -651,59 +622,90 @@ int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
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return 0;
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}
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if (!ctx->has_valid_key && iname->name[0] == '_') {
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if (iname->len != 33)
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return -ENOENT;
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ret = digest_decode(iname->name+1, iname->len, buf);
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if (ret != 24)
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return -ENOENT;
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memcpy(&hinfo->hash, buf, 4);
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memcpy(&hinfo->minor_hash, buf + 4, 4);
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return 0;
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}
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if (!ctx->has_valid_key && iname->name[0] != '_') {
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if (iname->len > 43)
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return -ENOENT;
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ret = digest_decode(iname->name, iname->len, buf);
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ext4fs_dirhash(buf, ret, hinfo);
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return 0;
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}
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/* First encrypt the plaintext name */
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ret = ext4_fname_crypto_alloc_buffer(ctx, iname->len, &tmp);
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if (ret < 0)
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return ret;
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ret = ext4_fname_encrypt(ctx, iname, &tmp);
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if (ret < 0)
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goto out;
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tmp2.len = (4 * ((EXT4_FNAME_CRYPTO_DIGEST_SIZE + 2) / 3)) + 1;
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tmp2.name = kmalloc(tmp2.len + 1, GFP_KERNEL);
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if (tmp2.name == NULL) {
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ret = -ENOMEM;
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goto out;
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}
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ret = ext4_fname_hash(ctx, &tmp, &tmp2);
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if (ret > 0)
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ext4fs_dirhash(tmp2.name, tmp2.len, hinfo);
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ext4_fname_crypto_free_buffer(&tmp2);
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out:
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ext4_fname_crypto_free_buffer(&tmp);
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return ret;
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}
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/**
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* ext4_fname_disk_to_htree() - converts a filename from disk space to htree-access string
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*/
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int ext4_fname_disk_to_hash(struct ext4_fname_crypto_ctx *ctx,
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const struct ext4_dir_entry_2 *de,
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struct dx_hash_info *hinfo)
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{
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struct ext4_str iname = {.name = (unsigned char *) de->name,
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.len = de->name_len};
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struct ext4_str tmp;
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int ret;
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if (!ctx ||
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((iname.name[0] == '.') &&
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((iname.len == 1) ||
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((iname.name[1] == '.') && (iname.len == 2))))) {
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ext4fs_dirhash(iname.name, iname.len, hinfo);
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return 0;
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}
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tmp.len = (4 * ((EXT4_FNAME_CRYPTO_DIGEST_SIZE + 2) / 3)) + 1;
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tmp.name = kmalloc(tmp.len + 1, GFP_KERNEL);
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if (tmp.name == NULL)
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return -ENOMEM;
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ret = ext4_fname_hash(ctx, &iname, &tmp);
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if (ret > 0)
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if (ret >= 0) {
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ext4fs_dirhash(tmp.name, tmp.len, hinfo);
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ret = 0;
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}
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ext4_fname_crypto_free_buffer(&tmp);
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return ret;
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}
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int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr,
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int len, const char * const name,
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struct ext4_dir_entry_2 *de)
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{
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int ret = -ENOENT;
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int bigname = (*name == '_');
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if (ctx->has_valid_key) {
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if (cstr->name == NULL) {
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struct qstr istr;
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ret = ext4_fname_crypto_alloc_buffer(ctx, len, cstr);
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if (ret < 0)
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goto errout;
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istr.name = name;
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istr.len = len;
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ret = ext4_fname_encrypt(ctx, &istr, cstr);
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if (ret < 0)
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goto errout;
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}
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} else {
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if (cstr->name == NULL) {
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cstr->name = kmalloc(32, GFP_KERNEL);
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if (cstr->name == NULL)
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return -ENOMEM;
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if ((bigname && (len != 33)) ||
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(!bigname && (len > 43)))
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goto errout;
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ret = digest_decode(name+bigname, len-bigname,
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cstr->name);
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if (ret < 0) {
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ret = -ENOENT;
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goto errout;
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}
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cstr->len = ret;
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}
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if (bigname) {
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if (de->name_len < 16)
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return 0;
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ret = memcmp(de->name + de->name_len - 16,
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cstr->name + 8, 16);
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return (ret == 0) ? 1 : 0;
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}
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}
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if (de->name_len != cstr->len)
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return 0;
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ret = memcmp(de->name, cstr->name, cstr->len);
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return (ret == 0) ? 1 : 0;
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errout:
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kfree(cstr->name);
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cstr->name = NULL;
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return ret;
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}
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@ -249,7 +249,7 @@ static int ext4_readdir(struct file *file, struct dir_context *ctx)
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} else {
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/* Directory is encrypted */
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err = ext4_fname_disk_to_usr(enc_ctx,
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de, &fname_crypto_str);
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NULL, de, &fname_crypto_str);
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if (err < 0)
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goto errout;
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if (!dir_emit(ctx,
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@ -2093,9 +2093,11 @@ u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
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int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx,
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u32 ilen, struct ext4_str *crypto_str);
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int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
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struct dx_hash_info *hinfo,
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const struct ext4_str *iname,
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struct ext4_str *oname);
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int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
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struct dx_hash_info *hinfo,
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const struct ext4_dir_entry_2 *de,
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struct ext4_str *oname);
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int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx,
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@ -2104,11 +2106,12 @@ int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx,
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int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
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const struct qstr *iname,
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struct dx_hash_info *hinfo);
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int ext4_fname_disk_to_hash(struct ext4_fname_crypto_ctx *ctx,
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const struct ext4_dir_entry_2 *de,
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struct dx_hash_info *hinfo);
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int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx,
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u32 namelen);
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int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr,
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int len, const char * const name,
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struct ext4_dir_entry_2 *de);
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#ifdef CONFIG_EXT4_FS_ENCRYPTION
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void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx);
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@ -640,7 +640,7 @@ static struct stats dx_show_leaf(struct inode *dir,
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ext4_put_fname_crypto_ctx(&ctx);
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ctx = NULL;
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}
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res = ext4_fname_disk_to_usr(ctx, de,
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res = ext4_fname_disk_to_usr(ctx, NULL, de,
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&fname_crypto_str);
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if (res < 0) {
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printk(KERN_WARNING "Error "
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@ -653,15 +653,8 @@ static struct stats dx_show_leaf(struct inode *dir,
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name = fname_crypto_str.name;
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len = fname_crypto_str.len;
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}
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res = ext4_fname_disk_to_hash(ctx, de,
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&h);
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if (res < 0) {
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printk(KERN_WARNING "Error "
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"converting filename "
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"from disk to htree"
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"\n");
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h.hash = 0xDEADBEEF;
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}
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ext4fs_dirhash(de->name, de->name_len,
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&h);
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printk("%*.s:(E)%x.%u ", len, name,
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h.hash, (unsigned) ((char *) de
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- base));
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@ -1008,15 +1001,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
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/* silently ignore the rest of the block */
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break;
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}
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#ifdef CONFIG_EXT4_FS_ENCRYPTION
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err = ext4_fname_disk_to_hash(ctx, de, hinfo);
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if (err < 0) {
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count = err;
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goto errout;
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}
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#else
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ext4fs_dirhash(de->name, de->name_len, hinfo);
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#endif
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if ((hinfo->hash < start_hash) ||
|
||||
((hinfo->hash == start_hash) &&
|
||||
(hinfo->minor_hash < start_minor_hash)))
|
||||
@ -1032,7 +1017,7 @@ static int htree_dirblock_to_tree(struct file *dir_file,
|
||||
&tmp_str);
|
||||
} else {
|
||||
/* Directory is encrypted */
|
||||
err = ext4_fname_disk_to_usr(ctx, de,
|
||||
err = ext4_fname_disk_to_usr(ctx, hinfo, de,
|
||||
&fname_crypto_str);
|
||||
if (err < 0) {
|
||||
count = err;
|
||||
@ -1193,26 +1178,10 @@ static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
|
||||
int count = 0;
|
||||
char *base = (char *) de;
|
||||
struct dx_hash_info h = *hinfo;
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
struct ext4_fname_crypto_ctx *ctx = NULL;
|
||||
int err;
|
||||
|
||||
ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN);
|
||||
if (IS_ERR(ctx))
|
||||
return PTR_ERR(ctx);
|
||||
#endif
|
||||
|
||||
while ((char *) de < base + blocksize) {
|
||||
if (de->name_len && de->inode) {
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
err = ext4_fname_disk_to_hash(ctx, de, &h);
|
||||
if (err < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return err;
|
||||
}
|
||||
#else
|
||||
ext4fs_dirhash(de->name, de->name_len, &h);
|
||||
#endif
|
||||
map_tail--;
|
||||
map_tail->hash = h.hash;
|
||||
map_tail->offs = ((char *) de - base)>>2;
|
||||
@ -1223,9 +1192,6 @@ static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
|
||||
/* XXX: do we need to check rec_len == 0 case? -Chris */
|
||||
de = ext4_next_entry(de, blocksize);
|
||||
}
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
#endif
|
||||
return count;
|
||||
}
|
||||
|
||||
@ -1287,16 +1253,8 @@ static inline int ext4_match(struct ext4_fname_crypto_ctx *ctx,
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_EXT4_FS_ENCRYPTION
|
||||
if (ctx) {
|
||||
/* Directory is encrypted */
|
||||
res = ext4_fname_disk_to_usr(ctx, de, fname_crypto_str);
|
||||
if (res < 0)
|
||||
return res;
|
||||
if (len != res)
|
||||
return 0;
|
||||
res = memcmp(name, fname_crypto_str->name, len);
|
||||
return (res == 0) ? 1 : 0;
|
||||
}
|
||||
if (ctx)
|
||||
return ext4_fname_match(ctx, fname_crypto_str, len, name, de);
|
||||
#endif
|
||||
if (len != de->name_len)
|
||||
return 0;
|
||||
@ -1324,16 +1282,6 @@ int search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
|
||||
if (IS_ERR(ctx))
|
||||
return -1;
|
||||
|
||||
if (ctx != NULL) {
|
||||
/* Allocate buffer to hold maximum name length */
|
||||
res = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN,
|
||||
&fname_crypto_str);
|
||||
if (res < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
de = (struct ext4_dir_entry_2 *)search_buf;
|
||||
dlimit = search_buf + buf_size;
|
||||
while ((char *) de < dlimit) {
|
||||
@ -1872,14 +1820,6 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode,
|
||||
return res;
|
||||
}
|
||||
reclen = EXT4_DIR_REC_LEN(res);
|
||||
|
||||
/* Allocate buffer to hold maximum name length */
|
||||
res = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN,
|
||||
&fname_crypto_str);
|
||||
if (res < 0) {
|
||||
ext4_put_fname_crypto_ctx(&ctx);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
de = (struct ext4_dir_entry_2 *)buf;
|
||||
|
||||
@ -74,7 +74,7 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
|
||||
goto errout;
|
||||
}
|
||||
pstr.name = paddr;
|
||||
res = _ext4_fname_disk_to_usr(ctx, &cstr, &pstr);
|
||||
res = _ext4_fname_disk_to_usr(ctx, NULL, &cstr, &pstr);
|
||||
if (res < 0)
|
||||
goto errout;
|
||||
/* Null-terminate the name */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user