Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/auth/passdb-cache.c @ 2798:54b29901a793 HEAD

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Added simple LRU cache for auth requests. Currently only for sql passdb.
author Timo Sirainen <tss@iki.fi>
date Thu, 21 Oct 2004 05:23:09 +0300
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children 253fae0aa95f
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54b29901a793 Added simple LRU cache for auth requests. Currently only for sql passdb.
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1 /* Copyright (C) 2004 Timo Sirainen */
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2
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3 #include "common.h"
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4 #include "password-scheme.h"
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5 #include "passdb.h"
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6 #include "passdb-cache.h"
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7
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8 #include <stdlib.h>
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9
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10 struct auth_cache *passdb_cache = NULL;
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11
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12 static void list_save(struct auth_request *request, const char *password,
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13 const char *const *list)
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14 {
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15 struct auth_request_extra *extra;
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16 const char *name, *value;
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17
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18 if (*list == NULL)
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19 return;
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20
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21 extra = auth_request_extra_begin(request, password);
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22 for (; *list != NULL; list++) {
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23 t_push();
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24 value = strchr(*list, '=');
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25 if (value == NULL) {
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26 name = *list;
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27 value = "";
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28 } else {
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29 name = t_strcut(*list, '=');
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30 value++;
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31 }
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32
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33 auth_request_extra_next(extra, name, value);
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34 t_pop();
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35 }
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36 auth_request_extra_finish(extra, NULL);
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37 }
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38
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39 int passdb_cache_verify_plain(struct auth_request *request, const char *key,
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40 const char *password, const char *default_scheme,
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41 enum passdb_result *result_r)
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42 {
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43 const char *value, *cached_pw, *scheme, *const *list;
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44 int ret;
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45
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46 i_assert(default_scheme != NULL);
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47
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48 if (passdb_cache == NULL)
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49 return FALSE;
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50
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51 /* value = password \t ... */
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52 value = auth_cache_lookup(passdb_cache, request, key);
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53 if (value == NULL)
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54 return FALSE;
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55
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56 if (*value == '\0') {
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57 /* negative cache entry */
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58 *result_r = PASSDB_RESULT_USER_UNKNOWN;
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59 return TRUE;
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60 }
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61
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62 list = t_strsplit(value, "\t");
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63 cached_pw = list[0];
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64
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65 scheme = password_get_scheme(&cached_pw);
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66 if (scheme == NULL)
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67 scheme = default_scheme;
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68 list_save(request, password, list+1);
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69
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70 ret = password_verify(password, cached_pw, scheme, request->user);
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71 if (ret < 0) {
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72 i_error("cache(%s): Unknown password scheme %s",
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73 get_log_prefix(request), scheme);
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74 } else if (ret == 0) {
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75 if (verbose) {
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76 i_info("cache(%s): Password mismatch",
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77 get_log_prefix(request));
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78 }
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79 }
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80
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81 *result_r = ret > 0 ? PASSDB_RESULT_OK :
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82 PASSDB_RESULT_PASSWORD_MISMATCH;
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83 return TRUE;
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84 }
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85
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86 int passdb_cache_lookup_credentials(struct auth_request *request,
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87 const char *key, const char **result_r,
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88 const char **scheme_r)
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89 {
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90 const char *value, *const *list;
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91 const char *cached_pw;
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92
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93 if (passdb_cache == NULL)
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94 return FALSE;
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95
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96 value = auth_cache_lookup(passdb_cache, request, key);
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97 if (value == NULL)
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98 return FALSE;
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99
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100 if (*value == '\0') {
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101 /* negative cache entry */
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102 *result_r = NULL;
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103 *scheme_r = NULL;
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104 return TRUE;
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105 }
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106
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107 list = t_strsplit(value, "\t");
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108 list_save(request, NULL, list+1);
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109
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110 *result_r = list[0];
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111 *scheme_r = password_get_scheme(&cached_pw);
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112 return TRUE;
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113 }
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114
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115 void passdb_cache_init(void)
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116 {
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117 const char *env;
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118 size_t max_size;
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119 unsigned int cache_ttl;
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120
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121 env = getenv("CACHE_SIZE");
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122 if (env == NULL)
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123 return;
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124
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125 max_size = (size_t)strtoul(env, NULL, 10) * 1024;
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126 if (max_size == 0)
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127 return;
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128
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129 env = getenv("CACHE_TTL");
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130 if (env == NULL)
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131 return;
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132
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133 cache_ttl = (unsigned int)strtoul(env, NULL, 10);
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134 if (cache_ttl == 0)
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135 return;
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136
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137 passdb_cache = auth_cache_new(max_size, cache_ttl);
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138 }
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139
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140 void passdb_cache_deinit(void)
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141 {
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142 auth_cache_free(passdb_cache);
54b29901a793 Added simple LRU cache for auth requests. Currently only for sql passdb.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
143 }