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5b95b903 | 1 | /* |
ef57eb7b | 2 | * Copyright (C) 1996-2016 The Squid Software Foundation and contributors |
5b95b903 AJ |
3 | * |
4 | * Squid software is distributed under GPLv2+ license and includes | |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7 | */ | |
8 | ||
94439e4e | 9 | /* |
94439e4e | 10 | * AUTHOR: Arjan de Vet <Arjan.deVet@adv.iae.nl> |
11 | * | |
12 | * Example authentication program for Squid, based on the original | |
13 | * proxy_auth code from client_side.c, written by | |
14 | * Jon Thackray <jrmt@uk.gdscorp.com>. | |
15 | * | |
16 | * Uses a NCSA httpd style password file for authentication with the | |
17 | * following improvements suggested by various people: | |
18 | * | |
19 | * - comment lines are possible and should start with a '#'; | |
20 | * - empty or blank lines are possible; | |
21 | * - extra fields in the password file are ignored; this makes it | |
22 | * possible to use a Unix password file but I do not recommend that. | |
23 | * | |
304fb0a1 | 24 | * MD5 without salt and magic strings - Added by Ramon de Carvalho and Rodrigo Rubira Branco |
94439e4e | 25 | */ |
26 | ||
f7f3304a | 27 | #include "squid.h" |
43fed740 | 28 | #include "crypt_md5.h" |
43fed740 | 29 | #include "helpers/defines.h" |
1fa9b1a7 | 30 | #include "rfc1738.h" |
81951d76 | 31 | |
d75ae82c | 32 | #include <unordered_map> |
94439e4e | 33 | #if HAVE_SYS_STAT_H |
34 | #include <sys/stat.h> | |
35 | #endif | |
36 | #if HAVE_CRYPT_H | |
37 | #include <crypt.h> | |
38 | #endif | |
39 | ||
d75ae82c FC |
40 | typedef std::unordered_map<std::string, std::string> usermap_t; |
41 | usermap_t usermap; | |
94439e4e | 42 | |
43 | static void | |
44 | read_passwd_file(const char *passwdfile) | |
45 | { | |
46 | FILE *f; | |
3c18a677 | 47 | char buf[HELPER_INPUT_BUFFER]; |
94439e4e | 48 | char *user; |
49 | char *passwd; | |
d75ae82c FC |
50 | |
51 | usermap.clear(); | |
52 | //TODO: change to c++ streams | |
94439e4e | 53 | f = fopen(passwdfile, "r"); |
a2897c13 | 54 | if (NULL == f) { |
43fed740 | 55 | fprintf(stderr, "FATAL: %s: %s\n", passwdfile, xstrerror()); |
26ac0430 | 56 | exit(1); |
a2897c13 | 57 | } |
3c18a677 | 58 | unsigned int lineCount = 0; |
2ea57237 | 59 | buf[HELPER_INPUT_BUFFER-1] = '\0'; |
3c18a677 AJ |
60 | while (fgets(buf, sizeof(buf)-1, f) != NULL) { |
61 | ++lineCount; | |
26ac0430 AJ |
62 | if ((buf[0] == '#') || (buf[0] == ' ') || (buf[0] == '\t') || |
63 | (buf[0] == '\n')) | |
64 | continue; | |
65 | user = strtok(buf, ":\n\r"); | |
3c18a677 AJ |
66 | if (user == NULL) { |
67 | fprintf(stderr, "ERROR: Missing user name at %s line %d\n", passwdfile, lineCount); | |
68 | continue; | |
69 | } | |
26ac0430 AJ |
70 | passwd = strtok(NULL, ":\n\r"); |
71 | if ((strlen(user) > 0) && passwd) { | |
d75ae82c | 72 | usermap[user] = passwd; |
26ac0430 | 73 | } |
94439e4e | 74 | } |
75 | fclose(f); | |
76 | } | |
77 | ||
78 | int | |
79 | main(int argc, char **argv) | |
80 | { | |
81 | struct stat sb; | |
407e1c93 | 82 | time_t change_time = -1; |
43fed740 | 83 | char buf[HELPER_INPUT_BUFFER]; |
94439e4e | 84 | char *user, *passwd, *p; |
94439e4e | 85 | setbuf(stdout, NULL); |
86 | if (argc != 2) { | |
26ac0430 AJ |
87 | fprintf(stderr, "Usage: ncsa_auth <passwordfile>\n"); |
88 | exit(1); | |
94439e4e | 89 | } |
90 | if (stat(argv[1], &sb) != 0) { | |
43fed740 | 91 | fprintf(stderr, "FATAL: cannot stat %s\n", argv[1]); |
26ac0430 | 92 | exit(1); |
94439e4e | 93 | } |
43fed740 | 94 | while (fgets(buf, HELPER_INPUT_BUFFER, stdin) != NULL) { |
26ac0430 | 95 | if ((p = strchr(buf, '\n')) != NULL) |
f53969cc | 96 | *p = '\0'; /* strip \n */ |
26ac0430 AJ |
97 | if (stat(argv[1], &sb) == 0) { |
98 | if (sb.st_mtime != change_time) { | |
99 | read_passwd_file(argv[1]); | |
100 | change_time = sb.st_mtime; | |
101 | } | |
102 | } | |
103 | if ((user = strtok(buf, " ")) == NULL) { | |
43fed740 | 104 | SEND_ERR(""); |
26ac0430 AJ |
105 | continue; |
106 | } | |
107 | if ((passwd = strtok(NULL, "")) == NULL) { | |
43fed740 | 108 | SEND_ERR(""); |
26ac0430 AJ |
109 | continue; |
110 | } | |
111 | rfc1738_unescape(user); | |
112 | rfc1738_unescape(passwd); | |
d75ae82c FC |
113 | const auto userpassIterator = usermap.find(user); |
114 | if (userpassIterator == usermap.end()) { | |
43fed740 | 115 | SEND_ERR("No such user"); |
2df24144 AJ |
116 | continue; |
117 | } | |
d75ae82c FC |
118 | std::string stored_pass = userpassIterator->second; |
119 | ||
2df24144 | 120 | char *crypted = NULL; |
8655ee19 | 121 | #if HAVE_CRYPT |
f04d5d43 | 122 | size_t passwordLength = strlen(passwd); |
2df24144 AJ |
123 | // Bug 3831: given algorithms more secure than DES crypt() does not truncate, so we can ignore the bug 3107 length checks below |
124 | // '$1$' = MD5, '$2a$' = Blowfish, '$5$' = SHA256 (Linux), '$6$' = SHA256 (BSD) and SHA512 | |
d75ae82c FC |
125 | if (passwordLength > 1 && stored_pass[0] == '$' && |
126 | (crypted = crypt(passwd, stored_pass.c_str())) && stored_pass == crypted) { | |
2df24144 AJ |
127 | SEND_OK(""); |
128 | continue; | |
129 | } | |
130 | // 'other' prefixes indicate DES algorithm. | |
d75ae82c | 131 | if (passwordLength <= 8 && (crypted = crypt(passwd, stored_pass.c_str())) && stored_pass == crypted) { |
43fed740 | 132 | SEND_OK(""); |
2df24144 AJ |
133 | continue; |
134 | } | |
d75ae82c | 135 | if (passwordLength > 8 && (crypted = crypt(passwd, stored_pass.c_str())) && stored_pass == crypted) { |
2d2772b0 AJ |
136 | // Bug 3107: crypt() DES functionality silently truncates long passwords. |
137 | SEND_ERR("Password too long. Only 8 characters accepted."); | |
2df24144 AJ |
138 | continue; |
139 | } | |
140 | ||
8655ee19 | 141 | #endif |
d75ae82c | 142 | if ( (crypted = crypt_md5(passwd, stored_pass.c_str())) && stored_pass == crypted) { |
43fed740 | 143 | SEND_OK(""); |
2df24144 AJ |
144 | continue; |
145 | } | |
d75ae82c | 146 | if ( (crypted = md5sum(passwd)) && stored_pass == crypted) { |
43fed740 | 147 | SEND_OK(""); |
2df24144 | 148 | continue; |
26ac0430 | 149 | } |
2df24144 | 150 | SEND_ERR("Wrong password"); |
94439e4e | 151 | } |
152 | exit(0); | |
153 | } | |
f53969cc | 154 |