Adding upstream version 2:4.17.12+dfsg.upstream/2%4.17.12+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 716 insertions, 0 deletions

diff --git a/libcli/smb/util.c b/libcli/smb/util.c
new file mode 100644
index 0000000..e1c0f12
--- /dev/null
+++ b/libcli/smb/util.c
@@ -0,0 +1,716 @@
+/*
+   Unix SMB/CIFS implementation.
+   client file operations
+   Copyright (C) Andrew Tridgell 1994-1998
+   Copyright (C) Jeremy Allison 2001-2002
+   Copyright (C) James Myers 2003
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "libcli/smb/smb_common.h"
+#include "system/filesys.h"
+#include "lib/param/loadparm.h"
+#include "lib/param/param.h"
+#include "libcli/smb/smb2_negotiate_context.h"
+
+const char *smb_protocol_types_string(enum protocol_types protocol)
+{
+	switch (protocol) {
+	case PROTOCOL_DEFAULT:
+		return "DEFAULT";
+	case PROTOCOL_NONE:
+		return "NONE";
+	case PROTOCOL_CORE:
+		return "CORE";
+	case PROTOCOL_COREPLUS:
+		return "COREPLUS";
+	case PROTOCOL_LANMAN1:
+		return "LANMAN1";
+	case PROTOCOL_LANMAN2:
+		return "LANMAN2";
+	case PROTOCOL_NT1:
+		return "NT1";
+	case PROTOCOL_SMB2_02:
+		return "SMB2_02";
+	case PROTOCOL_SMB2_10:
+		return "SMB2_10";
+	case PROTOCOL_SMB3_00:
+		return "SMB3_00";
+	case PROTOCOL_SMB3_02:
+		return "SMB3_02";
+	case PROTOCOL_SMB3_11:
+		return "SMB3_11";
+	}
+
+	return "Invalid protocol_types value";
+}
+
+/**
+ Return a string representing a CIFS attribute for a file.
+**/
+char *attrib_string(TALLOC_CTX *mem_ctx, uint32_t attrib)
+{
+	size_t i, len;
+	const struct {
+		char c;
+		uint16_t attr;
+	} attr_strs[] = {
+		{'V', FILE_ATTRIBUTE_VOLUME},
+		{'D', FILE_ATTRIBUTE_DIRECTORY},
+		{'A', FILE_ATTRIBUTE_ARCHIVE},
+		{'H', FILE_ATTRIBUTE_HIDDEN},
+		{'S', FILE_ATTRIBUTE_SYSTEM},
+		{'N', FILE_ATTRIBUTE_NORMAL},
+		{'R', FILE_ATTRIBUTE_READONLY},
+		{'d', FILE_ATTRIBUTE_DEVICE},
+		{'t', FILE_ATTRIBUTE_TEMPORARY},
+		{'s', FILE_ATTRIBUTE_SPARSE},
+		{'r', FILE_ATTRIBUTE_REPARSE_POINT},
+		{'c', FILE_ATTRIBUTE_COMPRESSED},
+		{'o', FILE_ATTRIBUTE_OFFLINE},
+		{'n', FILE_ATTRIBUTE_NONINDEXED},
+		{'e', FILE_ATTRIBUTE_ENCRYPTED}
+	};
+	char *ret;
+
+	ret = talloc_array(mem_ctx, char, ARRAY_SIZE(attr_strs)+1);
+	if (!ret) {
+		return NULL;
+	}
+
+	for (len=i=0; i<ARRAY_SIZE(attr_strs); i++) {
+		if (attrib & attr_strs[i].attr) {
+			ret[len++] = attr_strs[i].c;
+		}
+	}
+
+	ret[len] = 0;
+
+	talloc_set_name_const(ret, ret);
+
+	return ret;
+}
+
+/****************************************************************************
+ Map standard UNIX permissions onto wire representations.
+****************************************************************************/
+
+uint32_t unix_perms_to_wire(mode_t perms)
+{
+        unsigned int ret = 0;
+
+        ret |= ((perms & S_IXOTH) ?  UNIX_X_OTH : 0);
+        ret |= ((perms & S_IWOTH) ?  UNIX_W_OTH : 0);
+        ret |= ((perms & S_IROTH) ?  UNIX_R_OTH : 0);
+        ret |= ((perms & S_IXGRP) ?  UNIX_X_GRP : 0);
+        ret |= ((perms & S_IWGRP) ?  UNIX_W_GRP : 0);
+        ret |= ((perms & S_IRGRP) ?  UNIX_R_GRP : 0);
+        ret |= ((perms & S_IXUSR) ?  UNIX_X_USR : 0);
+        ret |= ((perms & S_IWUSR) ?  UNIX_W_USR : 0);
+        ret |= ((perms & S_IRUSR) ?  UNIX_R_USR : 0);
+#ifdef S_ISVTX
+        ret |= ((perms & S_ISVTX) ?  UNIX_STICKY : 0);
+#endif
+#ifdef S_ISGID
+        ret |= ((perms & S_ISGID) ?  UNIX_SET_GID : 0);
+#endif
+#ifdef S_ISUID
+        ret |= ((perms & S_ISUID) ?  UNIX_SET_UID : 0);
+#endif
+        return ret;
+}
+
+/****************************************************************************
+ Map wire permissions to standard UNIX.
+****************************************************************************/
+
+mode_t wire_perms_to_unix(uint32_t perms)
+{
+        mode_t ret = (mode_t)0;
+
+        ret |= ((perms & UNIX_X_OTH) ? S_IXOTH : 0);
+        ret |= ((perms & UNIX_W_OTH) ? S_IWOTH : 0);
+        ret |= ((perms & UNIX_R_OTH) ? S_IROTH : 0);
+        ret |= ((perms & UNIX_X_GRP) ? S_IXGRP : 0);
+        ret |= ((perms & UNIX_W_GRP) ? S_IWGRP : 0);
+        ret |= ((perms & UNIX_R_GRP) ? S_IRGRP : 0);
+        ret |= ((perms & UNIX_X_USR) ? S_IXUSR : 0);
+        ret |= ((perms & UNIX_W_USR) ? S_IWUSR : 0);
+        ret |= ((perms & UNIX_R_USR) ? S_IRUSR : 0);
+#ifdef S_ISVTX
+        ret |= ((perms & UNIX_STICKY) ? S_ISVTX : 0);
+#endif
+#ifdef S_ISGID
+        ret |= ((perms & UNIX_SET_GID) ? S_ISGID : 0);
+#endif
+#ifdef S_ISUID
+        ret |= ((perms & UNIX_SET_UID) ? S_ISUID : 0);
+#endif
+        return ret;
+}
+
+/****************************************************************************
+ Return the file type from the wire filetype for UNIX extensions.
+****************************************************************************/
+
+mode_t unix_filetype_from_wire(uint32_t wire_type)
+{
+	switch (wire_type) {
+		case UNIX_TYPE_FILE:
+			return S_IFREG;
+		case UNIX_TYPE_DIR:
+			return S_IFDIR;
+#ifdef S_IFLNK
+		case UNIX_TYPE_SYMLINK:
+			return S_IFLNK;
+#endif
+#ifdef S_IFCHR
+		case UNIX_TYPE_CHARDEV:
+			return S_IFCHR;
+#endif
+#ifdef S_IFBLK
+		case UNIX_TYPE_BLKDEV:
+			return S_IFBLK;
+#endif
+#ifdef S_IFIFO
+		case UNIX_TYPE_FIFO:
+			return S_IFIFO;
+#endif
+#ifdef S_IFSOCK
+		case UNIX_TYPE_SOCKET:
+			return S_IFSOCK;
+#endif
+		default:
+			return (mode_t)0;
+	}
+}
+
+bool smb_buffer_oob(uint32_t bufsize, uint32_t offset, uint32_t length)
+{
+	if ((offset + length < offset) || (offset + length < length)) {
+		/* wrap */
+		return true;
+	}
+	if ((offset > bufsize) || (offset + length > bufsize)) {
+		/* overflow */
+		return true;
+	}
+	return false;
+}
+
+/***********************************************************
+ Common function for pushing stings, used by smb_bytes_push_str()
+ and trans_bytes_push_str(). Only difference is the align_odd
+ parameter setting.
+***********************************************************/
+
+static uint8_t *internal_bytes_push_str(uint8_t *buf, bool ucs2,
+					const char *str, size_t str_len,
+					bool align_odd,
+					size_t *pconverted_size)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	size_t buflen;
+	char *converted;
+	size_t converted_size;
+
+	/*
+	 * This check prevents us from
+	 * (re)alloc buf on a NULL TALLOC_CTX.
+	 */
+	if (buf == NULL) {
+		TALLOC_FREE(frame);
+		return NULL;
+	}
+
+	buflen = talloc_get_size(buf);
+
+	if (ucs2 &&
+	    ((align_odd && (buflen % 2 == 0)) ||
+	     (!align_odd && (buflen % 2 == 1)))) {
+		/*
+		 * We're pushing into an SMB buffer, align odd
+		 */
+		buf = talloc_realloc(NULL, buf, uint8_t, buflen + 1);
+		if (buf == NULL) {
+			TALLOC_FREE(frame);
+			return NULL;
+		}
+		buf[buflen] = '\0';
+		buflen += 1;
+	}
+
+	if (!convert_string_talloc(frame, CH_UNIX,
+				   ucs2 ? CH_UTF16LE : CH_DOS,
+				   str, str_len, &converted,
+				   &converted_size)) {
+		TALLOC_FREE(frame);
+		return NULL;
+	}
+
+	buf = talloc_realloc(NULL, buf, uint8_t,
+			     buflen + converted_size);
+	if (buf == NULL) {
+		TALLOC_FREE(frame);
+		return NULL;
+	}
+
+	memcpy(buf + buflen, converted, converted_size);
+
+	TALLOC_FREE(converted);
+
+	if (pconverted_size) {
+		*pconverted_size = converted_size;
+	}
+
+	TALLOC_FREE(frame);
+	return buf;
+}
+
+/***********************************************************
+ Push a string into an SMB buffer, with odd byte alignment
+ if it's a UCS2 string.
+***********************************************************/
+
+uint8_t *smb_bytes_push_str(uint8_t *buf, bool ucs2,
+			    const char *str, size_t str_len,
+			    size_t *pconverted_size)
+{
+	return internal_bytes_push_str(buf, ucs2, str, str_len,
+				       true, pconverted_size);
+}
+
+uint8_t *smb_bytes_push_bytes(uint8_t *buf, uint8_t prefix,
+			      const uint8_t *bytes, size_t num_bytes)
+{
+	size_t buflen;
+
+	/*
+	 * This check prevents us from
+	 * (re)alloc buf on a NULL TALLOC_CTX.
+	 */
+	if (buf == NULL) {
+		return NULL;
+	}
+	buflen = talloc_get_size(buf);
+
+	buf = talloc_realloc(NULL, buf, uint8_t,
+			     buflen + 1 + num_bytes);
+	if (buf == NULL) {
+		return NULL;
+	}
+	buf[buflen] = prefix;
+	memcpy(&buf[buflen+1], bytes, num_bytes);
+	return buf;
+}
+
+/***********************************************************
+ Same as smb_bytes_push_str(), but without the odd byte
+ align for ucs2 (we're pushing into a param or data block).
+ static for now, although this will probably change when
+ other modules use async trans calls.
+***********************************************************/
+
+uint8_t *trans2_bytes_push_str(uint8_t *buf, bool ucs2,
+			       const char *str, size_t str_len,
+			       size_t *pconverted_size)
+{
+	return internal_bytes_push_str(buf, ucs2, str, str_len,
+				       false, pconverted_size);
+}
+
+uint8_t *trans2_bytes_push_bytes(uint8_t *buf,
+				 const uint8_t *bytes, size_t num_bytes)
+{
+	size_t buflen;
+
+	if (buf == NULL) {
+		return NULL;
+	}
+	buflen = talloc_get_size(buf);
+
+	buf = talloc_realloc(NULL, buf, uint8_t,
+			     buflen + num_bytes);
+	if (buf == NULL) {
+		return NULL;
+	}
+	memcpy(&buf[buflen], bytes, num_bytes);
+	return buf;
+}
+
+static NTSTATUS internal_bytes_pull_str(TALLOC_CTX *mem_ctx, char **_str,
+					bool ucs2, bool align_odd,
+					const uint8_t *buf, size_t buf_len,
+					const uint8_t *position,
+					size_t *p_consumed)
+{
+	size_t pad = 0;
+	size_t offset;
+	char *str = NULL;
+	size_t str_len = 0;
+	bool ok;
+
+	*_str = NULL;
+	if (p_consumed != NULL) {
+		*p_consumed = 0;
+	}
+
+	if (position < buf) {
+		return NT_STATUS_INTERNAL_ERROR;
+	}
+
+	offset = PTR_DIFF(position, buf);
+	if (offset > buf_len) {
+		return NT_STATUS_BUFFER_TOO_SMALL;
+	}
+
+	if (ucs2 &&
+	    ((align_odd && (offset % 2 == 0)) ||
+	     (!align_odd && (offset % 2 == 1)))) {
+		pad += 1;
+		offset += 1;
+	}
+
+	if (offset > buf_len) {
+		return NT_STATUS_BUFFER_TOO_SMALL;
+	}
+
+	buf_len -= offset;
+	buf += offset;
+
+	if (ucs2) {
+		buf_len = utf16_len_n(buf, buf_len);
+	} else {
+		size_t tmp = strnlen((const char *)buf, buf_len);
+		if (tmp < buf_len) {
+			tmp += 1;
+		}
+		buf_len = tmp;
+	}
+
+	ok = convert_string_talloc(mem_ctx,
+				   ucs2 ? CH_UTF16LE : CH_DOS,
+				   CH_UNIX,
+				   buf, buf_len,
+				   &str, &str_len);
+	if (!ok) {
+		return map_nt_error_from_unix_common(errno);
+	}
+
+	if (p_consumed != NULL) {
+		*p_consumed = buf_len + pad;
+	}
+	*_str = str;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS smb_bytes_pull_str(TALLOC_CTX *mem_ctx, char **_str, bool ucs2,
+			    const uint8_t *buf, size_t buf_len,
+			    const uint8_t *position,
+			    size_t *_consumed)
+{
+	return internal_bytes_pull_str(mem_ctx, _str, ucs2, true,
+				       buf, buf_len, position, _consumed);
+}
+
+/**
+ * @brief Translate SMB signing settings as string to an enum.
+ *
+ * @param[in]  str  The string to translate.
+ *
+ * @return A corresponding enum @smb_signing_setting tranlated from the string.
+ */
+enum smb_signing_setting smb_signing_setting_translate(const char *str)
+{
+	enum smb_signing_setting signing_state = SMB_SIGNING_REQUIRED;
+	int32_t val = lpcfg_parse_enum_vals("client signing", str);
+
+	if (val != INT32_MIN) {
+		signing_state = val;
+	}
+
+	return signing_state;
+}
+
+/**
+ * @brief Translate SMB encryption settings as string to an enum.
+ *
+ * @param[in]  str  The string to translate.
+ *
+ * @return A corresponding enum @smb_encryption_setting tranlated from the
+ *         string.
+ */
+enum smb_encryption_setting smb_encryption_setting_translate(const char *str)
+{
+	enum smb_encryption_setting encryption_state = SMB_ENCRYPTION_REQUIRED;
+	int32_t val = lpcfg_parse_enum_vals("client smb encrypt", str);
+
+	if (val != INT32_MIN) {
+		encryption_state = val;
+	}
+
+	return encryption_state;
+}
+
+static const struct enum_list enum_smb3_signing_algorithms[] = {
+	{SMB2_SIGNING_AES128_GMAC, "AES-128-GMAC"},
+	{SMB2_SIGNING_AES128_CMAC, "AES-128-CMAC"},
+	{SMB2_SIGNING_HMAC_SHA256, "HMAC-SHA256"},
+	{-1, NULL}
+};
+
+const char *smb3_signing_algorithm_name(uint16_t algo)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(enum_smb3_signing_algorithms); i++) {
+		if (enum_smb3_signing_algorithms[i].value != algo) {
+			continue;
+		}
+
+		return enum_smb3_signing_algorithms[i].name;
+	}
+
+	return NULL;
+}
+
+static const struct enum_list enum_smb3_encryption_algorithms[] = {
+	{SMB2_ENCRYPTION_AES128_GCM, "AES-128-GCM"},
+	{SMB2_ENCRYPTION_AES128_CCM, "AES-128-CCM"},
+	{SMB2_ENCRYPTION_AES256_GCM, "AES-256-GCM"},
+	{SMB2_ENCRYPTION_AES256_CCM, "AES-256-CCM"},
+	{-1, NULL}
+};
+
+const char *smb3_encryption_algorithm_name(uint16_t algo)
+{
+	size_t i;
+
+	for (i = 0; i < ARRAY_SIZE(enum_smb3_encryption_algorithms); i++) {
+		if (enum_smb3_encryption_algorithms[i].value != algo) {
+			continue;
+		}
+
+		return enum_smb3_encryption_algorithms[i].name;
+	}
+
+	return NULL;
+}
+
+static int32_t parse_enum_val(const struct enum_list *e,
+			      const char *param_name,
+			      const char *param_value)
+{
+	struct parm_struct parm = {
+		.label = param_name,
+		.type = P_LIST,
+		.p_class = P_GLOBAL,
+		.enum_list = e,
+	};
+	int32_t ret = INT32_MIN;
+	bool ok;
+
+	ok = lp_set_enum_parm(&parm, param_value, &ret);
+	if (!ok) {
+		return INT32_MIN;
+	}
+
+	return ret;
+}
+
+struct smb311_capabilities smb311_capabilities_parse(const char *role,
+				const char * const *signing_algos,
+				const char * const *encryption_algos)
+{
+	struct smb311_capabilities c = {
+		.signing = {
+			.num_algos = 0,
+		},
+		.encryption = {
+			.num_algos = 0,
+		},
+	};
+	char sign_param[64] = { 0, };
+	char enc_param[64] = { 0, };
+	size_t ai;
+
+	snprintf(sign_param, sizeof(sign_param),
+		 "%s smb3 signing algorithms", role);
+	snprintf(enc_param, sizeof(enc_param),
+		 "%s smb3 encryption algorithms", role);
+
+	for (ai = 0; signing_algos != NULL && signing_algos[ai] != NULL; ai++) {
+		const char *algoname = signing_algos[ai];
+		int32_t v32;
+		uint16_t algo;
+		size_t di;
+		bool ignore = false;
+
+		if (c.signing.num_algos >= SMB3_ENCRYTION_CAPABILITIES_MAX_ALGOS) {
+			DBG_ERR("WARNING: Ignoring trailing value '%s' for parameter '%s'\n",
+				  algoname, sign_param);
+			continue;
+		}
+
+		v32 = parse_enum_val(enum_smb3_signing_algorithms,
+				     sign_param, algoname);
+		if (v32 == INT32_MAX) {
+			continue;
+		}
+		algo = v32;
+
+		for (di = 0; di < c.signing.num_algos; di++) {
+			if (algo != c.signing.algos[di]) {
+				continue;
+			}
+
+			ignore = true;
+			break;
+		}
+
+		if (ignore) {
+			DBG_ERR("WARNING: Ignoring duplicate value '%s' for parameter '%s'\n",
+				  algoname, sign_param);
+			continue;
+		}
+
+		c.signing.algos[c.signing.num_algos] = algo;
+		c.signing.num_algos += 1;
+	}
+
+	for (ai = 0; encryption_algos != NULL && encryption_algos[ai] != NULL; ai++) {
+		const char *algoname = encryption_algos[ai];
+		int32_t v32;
+		uint16_t algo;
+		size_t di;
+		bool ignore = false;
+
+		if (c.encryption.num_algos >= SMB3_ENCRYTION_CAPABILITIES_MAX_ALGOS) {
+			DBG_ERR("WARNING: Ignoring trailing value '%s' for parameter '%s'\n",
+				  algoname, enc_param);
+			continue;
+		}
+
+		v32 = parse_enum_val(enum_smb3_encryption_algorithms,
+				     enc_param, algoname);
+		if (v32 == INT32_MAX) {
+			continue;
+		}
+		algo = v32;
+
+		for (di = 0; di < c.encryption.num_algos; di++) {
+			if (algo != c.encryption.algos[di]) {
+				continue;
+			}
+
+			ignore = true;
+			break;
+		}
+
+		if (ignore) {
+			DBG_ERR("WARNING: Ignoring duplicate value '%s' for parameter '%s'\n",
+				  algoname, enc_param);
+			continue;
+		}
+
+		c.encryption.algos[c.encryption.num_algos] = algo;
+		c.encryption.num_algos += 1;
+	}
+
+	return c;
+}
+
+NTSTATUS smb311_capabilities_check(const struct smb311_capabilities *c,
+				   const char *debug_prefix,
+				   int debug_lvl,
+				   NTSTATUS error_status,
+				   const char *role,
+				   enum protocol_types protocol,
+				   uint16_t sign_algo,
+				   uint16_t cipher_algo)
+{
+	const struct smb3_signing_capabilities *sign_algos =
+		&c->signing;
+	const struct smb3_encryption_capabilities *ciphers =
+		&c->encryption;
+	bool found_signing = false;
+	bool found_encryption = false;
+	size_t i;
+
+	for (i = 0; i < sign_algos->num_algos; i++) {
+		if (sign_algo == sign_algos->algos[i]) {
+			/*
+			 * We found a match
+			 */
+			found_signing = true;
+			break;
+		}
+	}
+
+	for (i = 0; i < ciphers->num_algos; i++) {
+		if (cipher_algo == SMB2_ENCRYPTION_NONE) {
+			/*
+			 * encryption not supported, we'll error out later
+			 */
+			found_encryption = true;
+			break;
+		}
+
+		if (cipher_algo == ciphers->algos[i]) {
+			/*
+			 * We found a match
+			 */
+			found_encryption = true;
+			break;
+		}
+	}
+
+	if (!found_signing) {
+		/*
+		 * We negotiated a signing algo we don't allow,
+		 * most likely for SMB < 3.1.1
+		 */
+		DEBUG(debug_lvl,("%s: "
+		      "SMB3 signing algorithm[%u][%s] on dialect[%s] "
+		      "not allowed by '%s smb3 signing algorithms' - %s.\n",
+		      debug_prefix,
+		      sign_algo,
+		      smb3_signing_algorithm_name(sign_algo),
+		      smb_protocol_types_string(protocol),
+		      role,
+		      nt_errstr(error_status)));
+		return error_status;
+	}
+
+	if (!found_encryption) {
+		/*
+		 * We negotiated a cipher we don't allow,
+		 * most likely for SMB 3.0 and 3.0.2
+		 */
+		DEBUG(debug_lvl,("%s: "
+		      "SMB3 encryption algorithm[%u][%s] on dialect[%s] "
+		      "not allowed by '%s smb3 encryption algorithms' - %s.\n",
+		      debug_prefix,
+		      cipher_algo,
+		      smb3_encryption_algorithm_name(cipher_algo),
+		      smb_protocol_types_string(protocol),
+		      role,
+		      nt_errstr(error_status)));
+		return error_status;
+	}
+
+	return NT_STATUS_OK;
+}