Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

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

1 files changed, 675 insertions, 0 deletions

diff --git a/source3/lib/substitute.c b/source3/lib/substitute.c
new file mode 100644
index 0000000..40eb15a
--- /dev/null
+++ b/source3/lib/substitute.c
@@ -0,0 +1,675 @@
+/*
+   Unix SMB/CIFS implementation.
+   string substitution functions
+   Copyright (C) Andrew Tridgell 1992-2000
+   Copyright (C) Gerald Carter   2006
+
+   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 "substitute.h"
+#include "system/passwd.h"
+#include "secrets.h"
+#include "auth.h"
+#include "lib/util/string_wrappers.h"
+
+/* Max DNS name is 253 + '\0' */
+#define MACHINE_NAME_SIZE 254
+
+static char local_machine[MACHINE_NAME_SIZE];
+static char remote_machine[MACHINE_NAME_SIZE];
+
+userdom_struct current_user_info;
+static fstring remote_proto="UNKNOWN";
+
+void set_remote_proto(const char *proto)
+{
+	fstrcpy(remote_proto, proto);
+}
+
+/**
+ * Set the 'local' machine name
+ * @param local_name the name we are being called
+ * @param if this is the 'final' name for us, not be be changed again
+ */
+bool set_local_machine_name(const char *local_name, bool perm)
+{
+	static bool already_perm = false;
+	char tmp[MACHINE_NAME_SIZE];
+
+	if (already_perm) {
+		return true;
+	}
+
+	strlcpy(tmp, local_name, sizeof(tmp));
+	trim_char(tmp, ' ', ' ');
+
+	alpha_strcpy(local_machine,
+		     tmp,
+		     SAFE_NETBIOS_CHARS,
+		     sizeof(local_machine) - 1);
+	if (!strlower_m(local_machine)) {
+		return false;
+	}
+
+	already_perm = perm;
+
+	return true;
+}
+
+const char *get_local_machine_name(void)
+{
+	if (local_machine[0] == '\0') {
+		return lp_netbios_name();
+	}
+
+	return local_machine;
+}
+
+/**
+ * Set the 'remote' machine name
+ *
+ * @param remote_name the name our client wants to be called by
+ * @param if this is the 'final' name for them, not be be changed again
+ */
+bool set_remote_machine_name(const char *remote_name, bool perm)
+{
+	static bool already_perm = False;
+	char tmp[MACHINE_NAME_SIZE];
+
+	if (already_perm) {
+		return true;
+	}
+
+	strlcpy(tmp, remote_name, sizeof(tmp));
+	trim_char(tmp, ' ', ' ');
+
+	alpha_strcpy(remote_machine,
+		     tmp,
+		     SAFE_NETBIOS_CHARS,
+		     sizeof(remote_machine) - 1);
+	if (!strlower_m(remote_machine)) {
+		return false;
+	}
+
+	already_perm = perm;
+
+	return true;
+}
+
+const char *get_remote_machine_name(void)
+{
+	return remote_machine;
+}
+
+static char sub_peeraddr[INET6_ADDRSTRLEN];
+static const char *sub_peername = NULL;
+static char sub_sockaddr[INET6_ADDRSTRLEN];
+
+void sub_set_socket_ids(const char *peeraddr, const char *peername,
+			const char *sockaddr)
+{
+	const char *addr = peeraddr;
+
+	if (strnequal(addr, "::ffff:", 7)) {
+		addr += 7;
+	}
+	strlcpy(sub_peeraddr, addr, sizeof(sub_peeraddr));
+
+	if (sub_peername != NULL &&
+			sub_peername != sub_peeraddr) {
+		talloc_free(discard_const_p(char,sub_peername));
+		sub_peername = NULL;
+	}
+	sub_peername = talloc_strdup(NULL, peername);
+	if (sub_peername == NULL) {
+		sub_peername = sub_peeraddr;
+	}
+
+	/*
+	 * Shouldn't we do the ::ffff: cancellation here as well? The
+	 * original code in talloc_sub_basic() did not do it, so I'm
+	 * leaving it out here as well for compatibility.
+	 */
+	strlcpy(sub_sockaddr, sockaddr, sizeof(sub_sockaddr));
+}
+
+/*******************************************************************
+ Setup the strings used by substitutions. Called per packet. Ensure
+ %U name is set correctly also.
+
+ smb_name must be sanitized by alpha_strcpy
+********************************************************************/
+
+void set_current_user_info(const char *smb_name, const char *unix_name,
+			   const char *domain)
+{
+	static const void *last_smb_name;
+	static const void *last_unix_name;
+	static const void *last_domain;
+
+	if (likely(last_smb_name == smb_name &&
+	    last_unix_name == unix_name &&
+	    last_domain == domain))
+	{
+		return;
+	}
+
+	fstrcpy(current_user_info.smb_name, smb_name);
+	fstrcpy(current_user_info.unix_name, unix_name);
+	fstrcpy(current_user_info.domain, domain);
+
+	last_smb_name = smb_name;
+	last_unix_name = unix_name;
+	last_domain = domain;
+}
+
+/*******************************************************************
+ Return the current active user name.
+*******************************************************************/
+
+const char *get_current_username(void)
+{
+	return current_user_info.smb_name;
+}
+
+const char *get_current_user_info_domain(void)
+{
+	return current_user_info.domain;
+}
+
+/*******************************************************************
+ Given a pointer to a %$(NAME) in p and the whole string in str
+ expand it as an environment variable.
+ str must be a talloced string.
+ Return a new allocated and expanded string.
+ Based on code by Branko Cibej <branko.cibej@hermes.si>
+ When this is called p points at the '%' character.
+ May substitute multiple occurrences of the same env var.
+********************************************************************/
+
+static char *realloc_expand_env_var(char *str, char *p)
+{
+	char *envname;
+	char *envval;
+	char *q, *r;
+	int copylen;
+
+	if (p[0] != '%' || p[1] != '$' || p[2] != '(') {
+		return str;
+	}
+
+	/*
+	 * Look for the terminating ')'.
+	 */
+
+	if ((q = strchr_m(p,')')) == NULL) {
+		DEBUG(0,("expand_env_var: Unterminated environment variable [%s]\n", p));
+		return str;
+	}
+
+	/*
+	 * Extract the name from within the %$(NAME) string.
+	 */
+
+	r = p + 3;
+	copylen = q - r;
+
+	/* reserve space for use later add %$() chars */
+	if ( (envname = talloc_array(talloc_tos(), char, copylen + 1 + 4)) == NULL ) {
+		return NULL;
+	}
+
+	strncpy(envname,r,copylen);
+	envname[copylen] = '\0';
+
+	if ((envval = getenv(envname)) == NULL) {
+		DEBUG(0,("expand_env_var: Environment variable [%s] not set\n", envname));
+		TALLOC_FREE(envname);
+		return str;
+	}
+
+	/*
+	 * Copy the full %$(NAME) into envname so it
+	 * can be replaced.
+	 */
+
+	copylen = q + 1 - p;
+	strncpy(envname,p,copylen);
+	envname[copylen] = '\0';
+	r = realloc_string_sub(str, envname, envval);
+	TALLOC_FREE(envname);
+
+	return r;
+}
+
+/****************************************************************************
+ Do some standard substitutions in a string.
+ len is the length in bytes of the space allowed in string str. If zero means
+ don't allow expansions.
+****************************************************************************/
+
+void standard_sub_basic(const char *smb_name, const char *domain_name,
+			char *str, size_t len)
+{
+	char *s;
+
+	if ( (s = talloc_sub_basic(talloc_tos(), smb_name, domain_name, str )) != NULL ) {
+		strncpy( str, s, len );
+	}
+
+	TALLOC_FREE( s );
+}
+
+/*
+ * Limit addresses to hexalpha characters and underscore, safe for path
+ * components for Windows clients.
+ */
+static void make_address_pathsafe(char *addr)
+{
+	while(addr && *addr) {
+		if(!isxdigit(*addr)) {
+			*addr = '_';
+		}
+		++addr;
+	}
+}
+
+/****************************************************************************
+ Do some standard substitutions in a string.
+ This function will return a talloced string that has to be freed.
+****************************************************************************/
+
+char *talloc_sub_basic(TALLOC_CTX *mem_ctx,
+			const char *smb_name,
+			const char *domain_name,
+			const char *str)
+{
+	char *b, *p, *s, *r, *a_string;
+	fstring pidstr, vnnstr;
+	const char *local_machine_name = get_local_machine_name();
+	TALLOC_CTX *tmp_ctx = NULL;
+
+	/* workaround to prevent a crash while looking at bug #687 */
+
+	if (!str) {
+		DEBUG(0,("talloc_sub_basic: NULL source string!  This should not happen\n"));
+		return NULL;
+	}
+
+	a_string = talloc_strdup(mem_ctx, str);
+	if (a_string == NULL) {
+		DEBUG(0, ("talloc_sub_basic: Out of memory!\n"));
+		return NULL;
+	}
+
+	tmp_ctx = talloc_stackframe();
+
+	for (s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
+
+		r = NULL;
+		b = a_string;
+
+		switch (*(p+1)) {
+		case 'U' :
+			r = strlower_talloc(tmp_ctx, smb_name);
+			if (r == NULL) {
+				goto error;
+			}
+			a_string = realloc_string_sub(a_string, "%U", r);
+			break;
+		case 'G' : {
+			struct passwd *pass;
+			bool is_domain_name = false;
+			const char *sep = lp_winbind_separator();
+
+			if (domain_name != NULL && domain_name[0] != '\0' &&
+			    (lp_security() == SEC_ADS ||
+			     lp_security() == SEC_DOMAIN)) {
+				r = talloc_asprintf(tmp_ctx,
+						    "%s%c%s",
+						    domain_name,
+						    *sep,
+						    smb_name);
+				is_domain_name = true;
+			} else {
+				r = talloc_strdup(tmp_ctx, smb_name);
+			}
+			if (r == NULL) {
+				goto error;
+			}
+
+			pass = Get_Pwnam_alloc(tmp_ctx, r);
+			if (pass != NULL) {
+				char *group_name;
+
+				group_name = gidtoname(pass->pw_gid);
+				if (is_domain_name) {
+					char *group_sep;
+					group_sep = strchr_m(group_name, *sep);
+					if (group_sep != NULL) {
+						group_name = group_sep + 1;
+					}
+				}
+				a_string = realloc_string_sub(a_string,
+							      "%G",
+							      group_name);
+			}
+			TALLOC_FREE(pass);
+			break;
+		}
+		case 'D' :
+			r = strupper_talloc(tmp_ctx, domain_name);
+			if (r == NULL) {
+				goto error;
+			}
+			a_string = realloc_string_sub(a_string, "%D", r);
+			break;
+		case 'I' : {
+			a_string = realloc_string_sub(
+				a_string, "%I",
+				sub_peeraddr[0] ? sub_peeraddr : "0.0.0.0");
+			break;
+		}
+		case 'J' : {
+			r = talloc_strdup(tmp_ctx,
+				sub_peeraddr[0] ? sub_peeraddr : "0.0.0.0");
+			make_address_pathsafe(r);
+			a_string = realloc_string_sub(a_string, "%J", r);
+			break;
+		}
+		case 'i':
+			a_string = realloc_string_sub(
+				a_string, "%i",
+				sub_sockaddr[0] ? sub_sockaddr : "0.0.0.0");
+			break;
+		case 'j' : {
+			r = talloc_strdup(tmp_ctx,
+				sub_sockaddr[0] ? sub_sockaddr : "0.0.0.0");
+			make_address_pathsafe(r);
+			a_string = realloc_string_sub(a_string, "%j", r);
+			break;
+		}
+		case 'L' :
+			if ( strncasecmp_m(p, "%LOGONSERVER%", strlen("%LOGONSERVER%")) == 0 ) {
+				break;
+			}
+			if (local_machine_name && *local_machine_name) {
+				a_string = realloc_string_sub(a_string, "%L", local_machine_name);
+			} else {
+				a_string = realloc_string_sub(a_string, "%L", lp_netbios_name());
+			}
+			break;
+		case 'N' :
+			a_string = realloc_string_sub(a_string,
+						      "%N",
+						      lp_netbios_name());
+			break;
+		case 'M' :
+			a_string = realloc_string_sub(a_string, "%M",
+						      sub_peername ? sub_peername : "");
+			break;
+		case 'R' :
+			a_string = realloc_string_sub(a_string, "%R", remote_proto);
+			break;
+		case 'T' :
+			a_string = realloc_string_sub(a_string, "%T", current_timestring(tmp_ctx, False));
+			break;
+		case 't' :
+			a_string = realloc_string_sub(a_string, "%t",
+						      current_minimal_timestring(tmp_ctx, False));
+			break;
+		case 'a' :
+			a_string = realloc_string_sub(a_string, "%a",
+					get_remote_arch_str());
+			break;
+		case 'd' :
+			slprintf(pidstr,sizeof(pidstr)-1, "%d",(int)getpid());
+			a_string = realloc_string_sub(a_string, "%d", pidstr);
+			break;
+		case 'h' :
+			a_string = realloc_string_sub(a_string, "%h", myhostname());
+			break;
+		case 'm' :
+			a_string = realloc_string_sub(a_string, "%m",
+						      remote_machine);
+			break;
+		case 'v' :
+			a_string = realloc_string_sub(a_string, "%v", samba_version_string());
+			break;
+		case 'w' :
+			a_string = realloc_string_sub(a_string, "%w", lp_winbind_separator());
+			break;
+		case '$' :
+			a_string = realloc_expand_env_var(a_string, p); /* Expand environment variables */
+			break;
+		case 'V' :
+			slprintf(vnnstr,sizeof(vnnstr)-1, "%u", get_my_vnn());
+			a_string = realloc_string_sub(a_string, "%V", vnnstr);
+			break;
+		default:
+			break;
+		}
+
+		p++;
+		TALLOC_FREE(r);
+
+		if (a_string == NULL) {
+			goto done;
+		}
+	}
+
+	goto done;
+
+error:
+	TALLOC_FREE(a_string);
+
+done:
+	TALLOC_FREE(tmp_ctx);
+	return a_string;
+}
+
+/****************************************************************************
+ Do some specific substitutions in a string.
+ This function will return an allocated string that have to be freed.
+****************************************************************************/
+
+char *talloc_sub_specified(TALLOC_CTX *mem_ctx,
+			const char *input_string,
+			const char *username,
+			const char *grpname,
+			const char *domain,
+			uid_t uid,
+			gid_t gid)
+{
+	char *a_string;
+	char *ret_string = NULL;
+	char *b, *p, *s;
+	TALLOC_CTX *tmp_ctx;
+
+	if (!(tmp_ctx = talloc_new(mem_ctx))) {
+		DEBUG(0, ("talloc_new failed\n"));
+		return NULL;
+	}
+
+	a_string = talloc_strdup(tmp_ctx, input_string);
+	if (a_string == NULL) {
+		DEBUG(0, ("talloc_sub_specified: Out of memory!\n"));
+		goto done;
+	}
+
+	for (s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
+
+		b = a_string;
+
+		switch (*(p+1)) {
+		case 'U' :
+			a_string = talloc_string_sub(
+				tmp_ctx, a_string, "%U", username);
+			break;
+		case 'u' :
+			a_string = talloc_string_sub(
+				tmp_ctx, a_string, "%u", username);
+			break;
+		case 'G' :
+			if (gid != -1) {
+				const char *name;
+
+				if (grpname != NULL) {
+					name = grpname;
+				} else {
+					name = gidtoname(gid);
+				}
+
+				a_string = talloc_string_sub(tmp_ctx,
+							     a_string,
+							     "%G",
+							     name);
+			} else {
+				a_string = talloc_string_sub(
+					tmp_ctx, a_string,
+					"%G", "NO_GROUP");
+			}
+			break;
+		case 'g' :
+			if (gid != -1) {
+				const char *name;
+
+				if (grpname != NULL) {
+					name = grpname;
+				} else {
+					name = gidtoname(gid);
+				}
+
+				a_string = talloc_string_sub(tmp_ctx,
+							     a_string,
+							     "%g",
+							     name);
+			} else {
+				a_string = talloc_string_sub(
+					tmp_ctx, a_string, "%g", "NO_GROUP");
+			}
+			break;
+		case 'D' :
+			a_string = talloc_string_sub(tmp_ctx, a_string,
+						     "%D", domain);
+			break;
+		case 'N' :
+			a_string = talloc_string_sub(tmp_ctx, a_string,
+						     "%N", lp_netbios_name());
+			break;
+		default:
+			break;
+		}
+
+		p++;
+		if (a_string == NULL) {
+			goto done;
+		}
+	}
+
+	/* Watch out, using "mem_ctx" here, so all intermediate stuff goes
+	 * away with the TALLOC_FREE(tmp_ctx) further down. */
+
+	ret_string = talloc_sub_basic(mem_ctx, username, domain, a_string);
+
+ done:
+	TALLOC_FREE(tmp_ctx);
+	return ret_string;
+}
+
+/****************************************************************************
+****************************************************************************/
+
+char *talloc_sub_advanced(TALLOC_CTX *ctx,
+			const char *servicename,
+			const char *user,
+			const char *connectpath,
+			gid_t gid,
+			const char *str)
+{
+	char *a_string;
+	char *b, *p, *s;
+
+	a_string = talloc_strdup(talloc_tos(), str);
+	if (a_string == NULL) {
+		DEBUG(0, ("talloc_sub_advanced_only: Out of memory!\n"));
+		return NULL;
+	}
+
+	for (s = a_string; (p = strchr_m(s, '%')); s = a_string + (p - b)) {
+
+		b = a_string;
+
+		switch (*(p+1)) {
+		case 'N':
+			a_string = realloc_string_sub(a_string,
+						      "%N",
+						      lp_netbios_name());
+			break;
+		case 'H': {
+			char *h;
+			if ((h = get_user_home_dir(talloc_tos(), user)))
+				a_string = realloc_string_sub(a_string, "%H", h);
+			TALLOC_FREE(h);
+			break;
+		}
+		case 'P':
+			a_string = realloc_string_sub(a_string, "%P", connectpath);
+			break;
+		case 'S':
+			a_string = realloc_string_sub(a_string, "%S", servicename);
+			break;
+		case 'g':
+			a_string = realloc_string_sub(a_string, "%g", gidtoname(gid));
+			break;
+		case 'u':
+			a_string = realloc_string_sub(a_string, "%u", user);
+			break;
+		default:
+			break;
+		}
+
+		p++;
+		if (a_string == NULL) {
+			return NULL;
+		}
+	}
+
+	return a_string;
+}
+
+char *talloc_sub_full(TALLOC_CTX *ctx,
+			const char *servicename,
+			const char *user,
+			const char *connectpath,
+			gid_t gid,
+			const char *smb_name,
+			const char *domain_name,
+			const char *str)
+{
+	char *a_string, *ret_string;
+
+	a_string = talloc_sub_advanced(ctx, servicename, user, connectpath,
+				       gid, str);
+	if (a_string == NULL) {
+		return NULL;
+	}
+
+	ret_string = talloc_sub_basic(ctx, smb_name, domain_name, a_string);
+	TALLOC_FREE(a_string);
+	return ret_string;
+}