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0ff1980a | 1 | /* |
2 | * text_backend.c | |
3 | * | |
4 | * AUTHOR: Robert Collins. Based on ncsa_auth.c by Arjan de Vet | |
5 | * <Arjan.deVet@adv.iae.nl> | |
6 | * | |
7 | * Example digest auth text backend for Squid, based on the original | |
8 | * proxy_auth code from client_side.c, written by | |
9 | * Jon Thackray <jrmt@uk.gdscorp.com>. | |
10 | * | |
11 | * - comment lines are possible and should start with a '#'; | |
12 | * - empty or blank lines are possible; | |
5fcad6f9 | 13 | * - file format is username:plaintext or username:realm:HA1 |
26ac0430 | 14 | * |
0ff1980a | 15 | * To build a directory integrated backend, you need to be able to |
16 | * calculate the HA1 returned to squid. To avoid storing a plaintext | |
17 | * password you can calculate MD5(username:realm:password) when the | |
18 | * user changes their password, and store the tuple username:realm:HA1. | |
19 | * then find the matching username:realm when squid asks for the | |
20 | * HA1. | |
21 | * | |
22 | * This implementation could be improved by using such a triple for | |
23 | * the file format. However storing such a triple does little to | |
24 | * improve security: If compromised the username:realm:HA1 combination | |
25 | * is "plaintext equivalent" - for the purposes of digest authentication | |
26 | * they allow the user access. Password syncronisation is not tackled | |
27 | * by digest - just preventing on the wire compromise. | |
28 | * | |
29 | * Copyright (c) 2003 Robert Collins <robertc@squid-cache.org> | |
30 | */ | |
f7f3304a | 31 | #include "squid.h" |
0ff1980a | 32 | |
33 | #include "text_backend.h" | |
34 | ||
35 | static hash_table *hash = NULL; | |
36 | static HASHFREE my_free; | |
37 | static char *passwdfile = NULL; | |
ca6965d0 | 38 | static int ha1mode = 0; |
0ff1980a | 39 | static time_t change_time = 0; |
40 | ||
41 | typedef struct _user_data { | |
42 | hash_link hash; | |
43 | char *passwd; | |
5fcad6f9 | 44 | char *ha1; |
0ff1980a | 45 | } user_data; |
46 | ||
47 | static void | |
48 | my_free(void *p) | |
49 | { | |
54e8823b | 50 | user_data *u = static_cast<user_data*>(p); |
0ff1980a | 51 | xfree(u->hash.key); |
52 | xfree(u->passwd); | |
53 | xfree(u); | |
54 | } | |
55 | ||
56 | static void | |
d5f8d05f | 57 | read_passwd_file(const char *passwordFile, int isHa1Mode) |
0ff1980a | 58 | { |
59 | FILE *f; | |
60 | char buf[8192]; | |
61 | user_data *u; | |
62 | char *user; | |
63 | char *passwd; | |
5fcad6f9 | 64 | char *ha1 = NULL; |
65 | char *realm; | |
0ff1980a | 66 | |
67 | if (hash != NULL) { | |
26ac0430 | 68 | hashFreeItems(hash, my_free); |
0ff1980a | 69 | } |
70 | /* initial setup */ | |
71 | hash = hash_create((HASHCMP *) strcmp, 7921, hash_string); | |
72 | if (NULL == hash) { | |
54e8823b | 73 | fprintf(stderr, "digest_file_auth: cannot create hash table\n"); |
26ac0430 | 74 | exit(1); |
0ff1980a | 75 | } |
d5f8d05f | 76 | f = fopen(passwordFile, "r"); |
0ff1980a | 77 | while (fgets(buf, 8192, f) != NULL) { |
26ac0430 AJ |
78 | if ((buf[0] == '#') || (buf[0] == ' ') || (buf[0] == '\t') || |
79 | (buf[0] == '\n')) | |
80 | continue; | |
81 | user = strtok(buf, ":\n"); | |
82 | realm = strtok(NULL, ":\n"); | |
83 | passwd = strtok(NULL, ":\n"); | |
84 | if (!passwd) { | |
85 | passwd = realm; | |
86 | realm = NULL; | |
87 | } | |
88 | if ((strlen(user) > 0) && passwd) { | |
89 | if (strncmp(passwd, "{HHA1}", 6) == 0) { | |
90 | ha1 = passwd + 6; | |
91 | passwd = NULL; | |
e053c141 | 92 | } else if (isHa1Mode) { |
26ac0430 AJ |
93 | ha1 = passwd; |
94 | passwd = NULL; | |
95 | } | |
96 | if (ha1 && strlen(ha1) != 32) { | |
97 | /* We cannot accept plaintext passwords when using HA1 encoding, | |
98 | * as the passwords may be output to cache.log if debugging is on. | |
99 | */ | |
54e8823b | 100 | fprintf(stderr, "digest_file_auth: ignoring invalid password for %s\n", user); |
26ac0430 AJ |
101 | continue; |
102 | } | |
54e8823b | 103 | u = static_cast<user_data*>(xcalloc(1, sizeof(*u))); |
26ac0430 AJ |
104 | if (realm) { |
105 | int len = strlen(user) + strlen(realm) + 2; | |
106 | u->hash.key = malloc(len); | |
54e8823b | 107 | snprintf(static_cast<char*>(u->hash.key), len, "%s:%s", user, realm); |
26ac0430 AJ |
108 | } else { |
109 | u->hash.key = xstrdup(user); | |
110 | } | |
111 | if (ha1) | |
112 | u->ha1 = xstrdup(ha1); | |
113 | else | |
114 | u->passwd = xstrdup(passwd); | |
115 | hash_join(hash, &u->hash); | |
116 | } | |
0ff1980a | 117 | } |
118 | fclose(f); | |
119 | } | |
120 | ||
121 | /* replace when changing the backend */ | |
122 | void | |
ca6965d0 | 123 | TextArguments(int argc, char **argv) |
0ff1980a | 124 | { |
125 | struct stat sb; | |
ca6965d0 | 126 | if (argc == 2) |
26ac0430 | 127 | passwdfile = argv[1]; |
ca6965d0 | 128 | if ((argc == 3) && !strcmp("-c", argv[1])) { |
26ac0430 AJ |
129 | ha1mode = 1; |
130 | passwdfile = argv[2]; | |
0ff1980a | 131 | } |
132 | if (!passwdfile) { | |
54e8823b | 133 | fprintf(stderr, "Usage: digest_file_auth [OPTIONS] <passwordfile>\n"); |
26ac0430 AJ |
134 | fprintf(stderr, " -c accept digest hashed passwords rather than plaintext in passwordfile\n"); |
135 | exit(1); | |
0ff1980a | 136 | } |
137 | if (stat(passwdfile, &sb) != 0) { | |
26ac0430 AJ |
138 | fprintf(stderr, "cannot stat %s\n", passwdfile); |
139 | exit(1); | |
0ff1980a | 140 | } |
141 | } | |
142 | ||
ca6965d0 | 143 | static const user_data * |
144 | GetPassword(RequestData * requestData) | |
0ff1980a | 145 | { |
146 | user_data *u; | |
147 | struct stat sb; | |
5fcad6f9 | 148 | char buf[256]; |
149 | int len; | |
0ff1980a | 150 | if (stat(passwdfile, &sb) == 0) { |
26ac0430 AJ |
151 | if (sb.st_mtime != change_time) { |
152 | read_passwd_file(passwdfile, ha1mode); | |
153 | change_time = sb.st_mtime; | |
154 | } | |
0ff1980a | 155 | } |
0ff1980a | 156 | if (!hash) |
26ac0430 | 157 | return NULL; |
5fcad6f9 | 158 | len = snprintf(buf, sizeof(buf), "%s:%s", requestData->user, requestData->realm); |
54e8823b | 159 | if (len >= static_cast<int>(sizeof(buf))) |
26ac0430 | 160 | return NULL; |
54e8823b | 161 | u = (user_data*)hash_lookup(hash, buf); |
5fcad6f9 | 162 | if (u) |
26ac0430 | 163 | return u; |
54e8823b | 164 | u = (user_data*)hash_lookup(hash, requestData->user); |
5fcad6f9 | 165 | return u; |
0ff1980a | 166 | } |
167 | ||
168 | void | |
ca6965d0 | 169 | TextHHA1(RequestData * requestData) |
0ff1980a | 170 | { |
ca6965d0 | 171 | const user_data *u = GetPassword(requestData); |
5fcad6f9 | 172 | if (!u) { |
26ac0430 AJ |
173 | requestData->error = -1; |
174 | return; | |
0ff1980a | 175 | } |
5fcad6f9 | 176 | if (u->ha1) { |
26ac0430 | 177 | xstrncpy(requestData->HHA1, u->ha1, sizeof(requestData->HHA1)); |
5fcad6f9 | 178 | } else { |
26ac0430 AJ |
179 | HASH HA1; |
180 | DigestCalcHA1("md5", requestData->user, requestData->realm, u->passwd, NULL, NULL, HA1, requestData->HHA1); | |
5fcad6f9 | 181 | } |
0ff1980a | 182 | } |