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-rw-r--r--source3/lib/username.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/source3/lib/username.c b/source3/lib/username.c
new file mode 100644
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--- /dev/null
+++ b/source3/lib/username.c
@@ -0,0 +1,243 @@
+/*
+ Unix SMB/CIFS implementation.
+ Username handling
+ Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Jeremy Allison 1997-2001.
+ Copyright (C) Andrew Bartlett 2002
+
+ 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 "system/passwd.h"
+#include "../lib/util/memcache.h"
+#include "../lib/util/util_pw.h"
+#include "lib/util/string_wrappers.h"
+
+/* internal functions */
+static struct passwd *uname_string_combinations(char *s, TALLOC_CTX *mem_ctx,
+ struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
+ int N);
+static struct passwd *uname_string_combinations2(char *s, TALLOC_CTX *mem_ctx, int offset,
+ struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
+ int N);
+
+static struct passwd *getpwnam_alloc_cached(TALLOC_CTX *mem_ctx, const char *name)
+{
+ struct passwd *pw, *for_cache;
+
+ pw = (struct passwd *)memcache_lookup_talloc(
+ NULL, GETPWNAM_CACHE, data_blob_string_const_null(name));
+ if (pw != NULL) {
+ return tcopy_passwd(mem_ctx, pw);
+ }
+
+ pw = getpwnam(name);
+ if (pw == NULL) {
+ return NULL;
+ }
+
+ for_cache = tcopy_passwd(talloc_tos(), pw);
+ if (for_cache == NULL) {
+ return NULL;
+ }
+
+ memcache_add_talloc(NULL, GETPWNAM_CACHE,
+ data_blob_string_const_null(name), &for_cache);
+
+ return tcopy_passwd(mem_ctx, pw);
+}
+
+/****************************************************************************
+ Flush all cached passwd structs.
+****************************************************************************/
+
+void flush_pwnam_cache(void)
+{
+ memcache_flush(NULL, GETPWNAM_CACHE);
+}
+
+/****************************************************************************
+ Get a users home directory.
+****************************************************************************/
+
+char *get_user_home_dir(TALLOC_CTX *mem_ctx, const char *user)
+{
+ struct passwd *pass;
+ char *result;
+
+ /* Ensure the user exists. */
+
+ pass = Get_Pwnam_alloc(mem_ctx, user);
+
+ if (!pass)
+ return(NULL);
+
+ /* Return home directory from struct passwd. */
+
+ result = talloc_move(mem_ctx, &pass->pw_dir);
+
+ TALLOC_FREE(pass);
+ return result;
+}
+
+/****************************************************************************
+ * A wrapper for getpwnam(). The following variations are tried:
+ * - as transmitted
+ * - in all lower case if this differs from transmitted
+ * - in all upper case if this differs from transmitted
+ * - using lp_username_level() for permutations.
+****************************************************************************/
+
+static struct passwd *Get_Pwnam_internals(TALLOC_CTX *mem_ctx,
+ const char *user, char *user2)
+{
+ struct passwd *ret = NULL;
+
+ if (!user2 || !(*user2))
+ return(NULL);
+
+ if (!user || !(*user))
+ return(NULL);
+
+ /* Try in all lower case first as this is the most
+ common case on UNIX systems */
+ if (!strlower_m(user2)) {
+ DEBUG(5,("strlower_m %s failed\n", user2));
+ goto done;
+ }
+
+ DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
+ ret = getpwnam_alloc_cached(mem_ctx, user2);
+ if(ret)
+ goto done;
+
+ /* Try as given, if username wasn't originally lowercase */
+ if(strcmp(user, user2) != 0) {
+ DEBUG(5,("Trying _Get_Pwnam(), username as given is %s\n",
+ user));
+ ret = getpwnam_alloc_cached(mem_ctx, user);
+ if(ret)
+ goto done;
+ }
+
+ /* Try as uppercase, if username wasn't originally uppercase */
+ if (!strupper_m(user2)) {
+ goto done;
+ }
+
+ if(strcmp(user, user2) != 0) {
+ DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",
+ user2));
+ ret = getpwnam_alloc_cached(mem_ctx, user2);
+ if(ret)
+ goto done;
+ }
+
+ /* Try all combinations up to usernamelevel */
+ if (!strlower_m(user2)) {
+ DEBUG(5,("strlower_m %s failed\n", user2));
+ goto done;
+ }
+ DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",
+ lp_username_level(), user2));
+ ret = uname_string_combinations(user2, mem_ctx, getpwnam_alloc_cached,
+ lp_username_level());
+
+done:
+ DEBUG(5,("Get_Pwnam_internals %s find user [%s]!\n",ret ?
+ "did":"didn't", user));
+
+ return ret;
+}
+
+/****************************************************************************
+ Get_Pwnam wrapper without modification.
+ NOTE: This with NOT modify 'user'!
+ This will return an allocated structure
+****************************************************************************/
+
+struct passwd *Get_Pwnam_alloc(TALLOC_CTX *mem_ctx, const char *user)
+{
+ fstring user2;
+
+ if ( *user == '\0' ) {
+ DEBUG(10,("Get_Pwnam: empty username!\n"));
+ return NULL;
+ }
+
+ fstrcpy(user2, user);
+
+ DEBUG(5,("Finding user %s\n", user));
+
+ return Get_Pwnam_internals(mem_ctx, user, user2);
+}
+
+/* The functions below have been taken from password.c and slightly modified */
+/****************************************************************************
+ Apply a function to upper/lower case combinations
+ of a string and return true if one of them returns true.
+ Try all combinations with N uppercase letters.
+ offset is the first char to try and change (start with 0)
+ it assumes the string starts lowercased
+****************************************************************************/
+
+static struct passwd *uname_string_combinations2(char *s, TALLOC_CTX *mem_ctx,
+ int offset,
+ struct passwd *(*fn)(TALLOC_CTX *mem_ctx, const char *),
+ int N)
+{
+ ssize_t len = (ssize_t)strlen(s);
+ int i;
+ struct passwd *ret;
+
+ if (N <= 0 || offset >= len)
+ return(fn(mem_ctx, s));
+
+ for (i=offset;i<(len-(N-1));i++) {
+ char c = s[i];
+ if (!islower_m((int)c))
+ continue;
+ s[i] = toupper_m(c);
+ ret = uname_string_combinations2(s, mem_ctx, i+1, fn, N-1);
+ if(ret)
+ return(ret);
+ s[i] = c;
+ }
+ return(NULL);
+}
+
+/****************************************************************************
+ Apply a function to upper/lower case combinations
+ of a string and return true if one of them returns true.
+ Try all combinations with up to N uppercase letters.
+ offset is the first char to try and change (start with 0)
+ it assumes the string starts lowercased
+****************************************************************************/
+
+static struct passwd * uname_string_combinations(char *s, TALLOC_CTX *mem_ctx,
+ struct passwd * (*fn)(TALLOC_CTX *mem_ctx, const char *),
+ int N)
+{
+ int n;
+ struct passwd *ret;
+
+ for (n=1;n<=N;n++) {
+ ret = uname_string_combinations2(s,mem_ctx,0,fn,n);
+ if(ret)
+ return(ret);
+ }
+ return(NULL);
+}
+