]>
Commit | Line | Data |
---|---|---|
94439e4e | 1 | /* |
94439e4e | 2 | * AUTHOR: Arjan de Vet <Arjan.deVet@adv.iae.nl> |
3 | * | |
4 | * Example authentication program for Squid, based on the original | |
5 | * proxy_auth code from client_side.c, written by | |
6 | * Jon Thackray <jrmt@uk.gdscorp.com>. | |
7 | * | |
8 | * Uses a NCSA httpd style password file for authentication with the | |
9 | * following improvements suggested by various people: | |
10 | * | |
11 | * - comment lines are possible and should start with a '#'; | |
12 | * - empty or blank lines are possible; | |
13 | * - extra fields in the password file are ignored; this makes it | |
14 | * possible to use a Unix password file but I do not recommend that. | |
15 | * | |
304fb0a1 | 16 | * MD5 without salt and magic strings - Added by Ramon de Carvalho and Rodrigo Rubira Branco |
94439e4e | 17 | */ |
18 | ||
f7f3304a | 19 | #include "squid.h" |
43fed740 AJ |
20 | #include "crypt_md5.h" |
21 | #include "hash.h" | |
22 | #include "helpers/defines.h" | |
1fa9b1a7 | 23 | #include "rfc1738.h" |
43fed740 | 24 | #include "util.h" |
81951d76 | 25 | |
074d6a40 AJ |
26 | #include <cerrno> |
27 | #include <cstring> | |
94439e4e | 28 | #if HAVE_UNISTD_H |
29 | #include <unistd.h> | |
30 | #endif | |
94439e4e | 31 | #if HAVE_SYS_STAT_H |
32 | #include <sys/stat.h> | |
33 | #endif | |
34 | #if HAVE_CRYPT_H | |
35 | #include <crypt.h> | |
36 | #endif | |
37 | ||
94439e4e | 38 | static hash_table *hash = NULL; |
39 | static HASHFREE my_free; | |
40 | ||
41 | typedef struct _user_data { | |
42 | /* first two items must be same as hash_link */ | |
43 | char *user; | |
44 | struct _user_data *next; | |
45 | char *passwd; | |
46 | } user_data; | |
47 | ||
48 | static void | |
49 | my_free(void *p) | |
50 | { | |
3138a4e4 | 51 | user_data *u = static_cast<user_data*>(p); |
94439e4e | 52 | xfree(u->user); |
53 | xfree(u->passwd); | |
54 | xfree(u); | |
55 | } | |
56 | ||
57 | static void | |
58 | read_passwd_file(const char *passwdfile) | |
59 | { | |
60 | FILE *f; | |
3c18a677 | 61 | char buf[HELPER_INPUT_BUFFER]; |
94439e4e | 62 | user_data *u; |
63 | char *user; | |
64 | char *passwd; | |
65 | if (hash != NULL) { | |
26ac0430 AJ |
66 | hashFreeItems(hash, my_free); |
67 | hashFreeMemory(hash); | |
94439e4e | 68 | } |
69 | /* initial setup */ | |
70 | hash = hash_create((HASHCMP *) strcmp, 7921, hash_string); | |
71 | if (NULL == hash) { | |
43fed740 | 72 | fprintf(stderr, "FATAL: Cannot create hash table\n"); |
26ac0430 | 73 | exit(1); |
94439e4e | 74 | } |
75 | f = fopen(passwdfile, "r"); | |
a2897c13 | 76 | if (NULL == f) { |
43fed740 | 77 | fprintf(stderr, "FATAL: %s: %s\n", passwdfile, xstrerror()); |
26ac0430 | 78 | exit(1); |
a2897c13 | 79 | } |
3c18a677 | 80 | unsigned int lineCount = 0; |
2ea57237 | 81 | buf[HELPER_INPUT_BUFFER-1] = '\0'; |
3c18a677 AJ |
82 | while (fgets(buf, sizeof(buf)-1, f) != NULL) { |
83 | ++lineCount; | |
26ac0430 AJ |
84 | if ((buf[0] == '#') || (buf[0] == ' ') || (buf[0] == '\t') || |
85 | (buf[0] == '\n')) | |
86 | continue; | |
87 | user = strtok(buf, ":\n\r"); | |
3c18a677 AJ |
88 | if (user == NULL) { |
89 | fprintf(stderr, "ERROR: Missing user name at %s line %d\n", passwdfile, lineCount); | |
90 | continue; | |
91 | } | |
26ac0430 AJ |
92 | passwd = strtok(NULL, ":\n\r"); |
93 | if ((strlen(user) > 0) && passwd) { | |
3138a4e4 | 94 | u = static_cast<user_data*>(xmalloc(sizeof(*u))); |
26ac0430 AJ |
95 | u->user = xstrdup(user); |
96 | u->passwd = xstrdup(passwd); | |
97 | hash_join(hash, (hash_link *) u); | |
98 | } | |
94439e4e | 99 | } |
100 | fclose(f); | |
101 | } | |
102 | ||
103 | int | |
104 | main(int argc, char **argv) | |
105 | { | |
106 | struct stat sb; | |
407e1c93 | 107 | time_t change_time = -1; |
43fed740 | 108 | char buf[HELPER_INPUT_BUFFER]; |
94439e4e | 109 | char *user, *passwd, *p; |
110 | user_data *u; | |
111 | setbuf(stdout, NULL); | |
112 | if (argc != 2) { | |
26ac0430 AJ |
113 | fprintf(stderr, "Usage: ncsa_auth <passwordfile>\n"); |
114 | exit(1); | |
94439e4e | 115 | } |
116 | if (stat(argv[1], &sb) != 0) { | |
43fed740 | 117 | fprintf(stderr, "FATAL: cannot stat %s\n", argv[1]); |
26ac0430 | 118 | exit(1); |
94439e4e | 119 | } |
43fed740 | 120 | while (fgets(buf, HELPER_INPUT_BUFFER, stdin) != NULL) { |
26ac0430 AJ |
121 | if ((p = strchr(buf, '\n')) != NULL) |
122 | *p = '\0'; /* strip \n */ | |
123 | if (stat(argv[1], &sb) == 0) { | |
124 | if (sb.st_mtime != change_time) { | |
125 | read_passwd_file(argv[1]); | |
126 | change_time = sb.st_mtime; | |
127 | } | |
128 | } | |
129 | if ((user = strtok(buf, " ")) == NULL) { | |
43fed740 | 130 | SEND_ERR(""); |
26ac0430 AJ |
131 | continue; |
132 | } | |
133 | if ((passwd = strtok(NULL, "")) == NULL) { | |
43fed740 | 134 | SEND_ERR(""); |
26ac0430 AJ |
135 | continue; |
136 | } | |
137 | rfc1738_unescape(user); | |
138 | rfc1738_unescape(passwd); | |
139 | u = (user_data *) hash_lookup(hash, user); | |
140 | if (u == NULL) { | |
43fed740 | 141 | SEND_ERR("No such user"); |
2df24144 AJ |
142 | continue; |
143 | } | |
144 | char *crypted = NULL; | |
8655ee19 | 145 | #if HAVE_CRYPT |
f04d5d43 | 146 | size_t passwordLength = strlen(passwd); |
2df24144 AJ |
147 | // Bug 3831: given algorithms more secure than DES crypt() does not truncate, so we can ignore the bug 3107 length checks below |
148 | // '$1$' = MD5, '$2a$' = Blowfish, '$5$' = SHA256 (Linux), '$6$' = SHA256 (BSD) and SHA512 | |
149 | if (passwordLength > 1 && u->passwd[0] == '$' && | |
b402a8ce | 150 | (crypted = crypt(passwd, u->passwd)) && strcmp(u->passwd, crypted) == 0) { |
2df24144 AJ |
151 | SEND_OK(""); |
152 | continue; | |
153 | } | |
154 | // 'other' prefixes indicate DES algorithm. | |
155 | if (passwordLength <= 8 && (crypted = crypt(passwd, u->passwd)) && (strcmp(u->passwd, crypted) == 0)) { | |
43fed740 | 156 | SEND_OK(""); |
2df24144 AJ |
157 | continue; |
158 | } | |
159 | if (passwordLength > 8 && (crypted = crypt(passwd, u->passwd)) && (strcmp(u->passwd, crypted) == 0)) { | |
2d2772b0 AJ |
160 | // Bug 3107: crypt() DES functionality silently truncates long passwords. |
161 | SEND_ERR("Password too long. Only 8 characters accepted."); | |
2df24144 AJ |
162 | continue; |
163 | } | |
164 | ||
8655ee19 | 165 | #endif |
2df24144 | 166 | if ( (crypted = crypt_md5(passwd, u->passwd)) && strcmp(u->passwd, crypted) == 0) { |
43fed740 | 167 | SEND_OK(""); |
2df24144 AJ |
168 | continue; |
169 | } | |
170 | if ( (crypted = md5sum(passwd)) && strcmp(u->passwd, crypted) == 0) { | |
43fed740 | 171 | SEND_OK(""); |
2df24144 | 172 | continue; |
26ac0430 | 173 | } |
2df24144 | 174 | SEND_ERR("Wrong password"); |
94439e4e | 175 | } |
5fb27788 | 176 | if (hash != NULL) { |
26ac0430 AJ |
177 | hashFreeItems(hash, my_free); |
178 | hashFreeMemory(hash); | |
5fb27788 | 179 | } |
94439e4e | 180 | exit(0); |
181 | } |