| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Username handling
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| 4 | Copyright (C) Andrew Tridgell 1992-1998
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| 5 | Copyright (C) Jeremy Allison 1997-2001.
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 3 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 |
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| 21 | #include "includes.h"
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| 22 |
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| 23 | /* internal functions */
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| 24 | static struct passwd *uname_string_combinations(char *s, TALLOC_CTX *mem_ctx,
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| 25 | struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
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| 26 | int N);
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| 27 | static struct passwd *uname_string_combinations2(char *s, TALLOC_CTX *mem_ctx, int offset,
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| 28 | struct passwd * (*fn) (TALLOC_CTX *mem_ctx, const char *),
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| 29 | int N);
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| 30 |
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| 31 | /****************************************************************************
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| 32 | Get a users home directory.
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| 33 | ****************************************************************************/
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| 34 |
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| 35 | char *get_user_home_dir(TALLOC_CTX *mem_ctx, const char *user)
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| 36 | {
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| 37 | struct passwd *pass;
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| 38 | char *result;
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| 39 |
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| 40 | /* Ensure the user exists. */
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| 41 |
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| 42 | pass = Get_Pwnam_alloc(mem_ctx, user);
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| 43 |
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| 44 | if (!pass)
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| 45 | return(NULL);
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| 46 |
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| 47 | /* Return home directory from struct passwd. */
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| 48 |
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| 49 | result = talloc_move(mem_ctx, &pass->pw_dir);
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| 50 |
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| 51 | TALLOC_FREE(pass);
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| 52 | return result;
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| 53 | }
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| 54 |
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| 55 | /****************************************************************************
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| 56 | * A wrapper for sys_getpwnam(). The following variations are tried:
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| 57 | * - as transmitted
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| 58 | * - in all lower case if this differs from transmitted
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| 59 | * - in all upper case if this differs from transmitted
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| 60 | * - using lp_usernamelevel() for permutations.
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| 61 | ****************************************************************************/
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| 62 |
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| 63 | static struct passwd *Get_Pwnam_internals(TALLOC_CTX *mem_ctx,
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| 64 | const char *user, char *user2)
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| 65 | {
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| 66 | struct passwd *ret = NULL;
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| 67 |
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| 68 | if (!user2 || !(*user2))
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| 69 | return(NULL);
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| 70 |
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| 71 | if (!user || !(*user))
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| 72 | return(NULL);
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| 73 |
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| 74 | /* Try in all lower case first as this is the most
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| 75 | common case on UNIX systems */
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| 76 | strlower_m(user2);
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| 77 | DEBUG(5,("Trying _Get_Pwnam(), username as lowercase is %s\n",user2));
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| 78 | ret = getpwnam_alloc(mem_ctx, user2);
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| 79 | if(ret)
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| 80 | goto done;
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| 81 |
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| 82 | /* Try as given, if username wasn't originally lowercase */
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| 83 | if(strcmp(user, user2) != 0) {
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| 84 | DEBUG(5,("Trying _Get_Pwnam(), username as given is %s\n",
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| 85 | user));
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| 86 | ret = getpwnam_alloc(mem_ctx, user);
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| 87 | if(ret)
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| 88 | goto done;
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| 89 | }
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| 90 |
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| 91 | /* Try as uppercase, if username wasn't originally uppercase */
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| 92 | strupper_m(user2);
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| 93 | if(strcmp(user, user2) != 0) {
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| 94 | DEBUG(5,("Trying _Get_Pwnam(), username as uppercase is %s\n",
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| 95 | user2));
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| 96 | ret = getpwnam_alloc(mem_ctx, user2);
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| 97 | if(ret)
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| 98 | goto done;
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| 99 | }
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| 100 |
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| 101 | /* Try all combinations up to usernamelevel */
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| 102 | strlower_m(user2);
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| 103 | DEBUG(5,("Checking combinations of %d uppercase letters in %s\n",
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| 104 | lp_usernamelevel(), user2));
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| 105 | ret = uname_string_combinations(user2, mem_ctx, getpwnam_alloc,
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| 106 | lp_usernamelevel());
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| 107 |
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| 108 | done:
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| 109 | DEBUG(5,("Get_Pwnam_internals %s find user [%s]!\n",ret ?
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| 110 | "did":"didn't", user));
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| 111 |
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| 112 | return ret;
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| 113 | }
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| 114 |
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| 115 | /****************************************************************************
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| 116 | Get_Pwnam wrapper without modification.
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| 117 | NOTE: This with NOT modify 'user'!
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| 118 | This will return an allocated structure
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| 119 | ****************************************************************************/
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| 120 |
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| 121 | struct passwd *Get_Pwnam_alloc(TALLOC_CTX *mem_ctx, const char *user)
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