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From 0d2898429e7eb2ca144885d5a1f9485cca620464 Mon Sep 17 00:00:00 2001
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From: Andreas Schneider <asn@samba.org>
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Date: Mon, 8 Jul 2019 18:21:18 +0200
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Subject: [PATCH 028/187] libcli:auth: Use
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samba_gnutls_arcfour_confounded_md5() in decode_wkssvc_join_password_buffer()
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BUG: https://bugzilla.samba.org/show_bug.cgi?id=14031
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Signed-off-by: Andreas Schneider <asn@samba.org>
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Reviewed-by: Andrew Bartlett <abartlet@samba.org>
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(cherry picked from commit bcf7808d3aa8a5932a40955e4b764f55061e07d7)
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---
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libcli/auth/smbencrypt.c | 71 ++++++++++++++--------------------------
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1 file changed, 24 insertions(+), 47 deletions(-)
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diff --git a/libcli/auth/smbencrypt.c b/libcli/auth/smbencrypt.c
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index 823e16a3387..cc5e1fbb899 100644
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--- a/libcli/auth/smbencrypt.c
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+++ b/libcli/auth/smbencrypt.c
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@@ -1011,70 +1011,47 @@ WERROR decode_wkssvc_join_password_buffer(TALLOC_CTX *mem_ctx,
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DATA_BLOB *session_key,
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char **pwd)
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{
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- gnutls_hash_hd_t hash_hnd = NULL;
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- uint8_t buffer[516];
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- size_t pwd_len;
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- WERROR result;
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+ uint8_t _confounder[8];
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+ DATA_BLOB confounder = data_blob_const(_confounder, 8);
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+ uint8_t pwbuf[516] = {0};
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+ DATA_BLOB decrypt_pwbuf = data_blob_const(pwbuf, 516);
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bool ok;
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int rc;
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- DATA_BLOB confounded_session_key;
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-
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- int confounder_len = 8;
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- uint8_t confounder[8];
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-
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- *pwd = NULL;
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-
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- if (!pwd_buf) {
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+ if (pwd_buf == NULL) {
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return WERR_INVALID_PASSWORD;
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}
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+ *pwd = NULL;
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+
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if (session_key->length != 16) {
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DEBUG(10,("invalid session key\n"));
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return WERR_INVALID_PASSWORD;
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}
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- confounded_session_key = data_blob_talloc(mem_ctx, NULL, 16);
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+ confounder = data_blob_const(&pwd_buf->data[0], 8);
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+ memcpy(&pwbuf, &pwd_buf->data[8], 516);
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- memcpy(&confounder, &pwd_buf->data[0], confounder_len);
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- memcpy(&buffer, &pwd_buf->data[8], 516);
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-
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- rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
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- if (rc < 0) {
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- result = gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
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- goto out;
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- }
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-
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- rc = gnutls_hash(hash_hnd, session_key->data, session_key->length);
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- if (rc < 0) {
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- gnutls_hash_deinit(hash_hnd, NULL);
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- result = gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
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- goto out;
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- }
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- rc = gnutls_hash(hash_hnd, confounder, confounder_len);
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+ rc = samba_gnutls_arcfour_confounded_md5(session_key,
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+ &confounder,
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+ &decrypt_pwbuf,
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+ SAMBA_GNUTLS_ENCRYPT);
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if (rc < 0) {
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- gnutls_hash_deinit(hash_hnd, NULL);
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- result = gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
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- goto out;
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+ ZERO_ARRAY(_confounder);
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+ TALLOC_FREE(pwd_buf);
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+ return gnutls_error_to_werror(rc, WERR_CONTENT_BLOCKED);
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}
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- gnutls_hash_deinit(hash_hnd, confounded_session_key.data);
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- arcfour_crypt_blob(buffer, 516, &confounded_session_key);
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-
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- ok = decode_pw_buffer(mem_ctx, buffer, pwd, &pwd_len, CH_UTF16);
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-
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- ZERO_ARRAY(confounder);
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- ZERO_ARRAY(buffer);
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-
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- data_blob_clear_free(&confounded_session_key);
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+ ok = decode_pw_buffer(mem_ctx,
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+ decrypt_pwbuf.data,
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+ pwd,
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+ &decrypt_pwbuf.length,
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+ CH_UTF16);
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+ ZERO_ARRAY(pwbuf);
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if (!ok) {
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- result = WERR_INVALID_PASSWORD;
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- goto out;
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+ return WERR_INVALID_PASSWORD;
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}
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- result = WERR_OK;
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-out:
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- return result;
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+ return WERR_OK;
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}
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-
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--
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2.23.0
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