1 | /* |
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2 | * $Source: /afs/dev.mit.edu/source/repository/athena/bin/attach/config.c,v $ |
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3 | * $Author: miki $ |
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4 | * $Header: /afs/dev.mit.edu/source/repository/athena/bin/attach/config.c,v 1.7 1994-06-07 17:23:24 miki Exp $ |
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5 | */ |
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6 | |
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7 | #ifndef lint |
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8 | static char *rcsid_config_c = "$Header: /afs/dev.mit.edu/source/repository/athena/bin/attach/config.c,v 1.7 1994-06-07 17:23:24 miki Exp $"; |
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9 | #endif |
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10 | |
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11 | #include "attach.h" |
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12 | #include "pwd.h" |
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13 | #include <string.h> |
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14 | |
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15 | |
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16 | #define TOKSEP " \t\r\n" |
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17 | |
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18 | /* |
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19 | * Declare the filesystem tables for nosetuid and allowable mountings |
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20 | */ |
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21 | struct filesys_tab { |
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22 | struct _tab { |
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23 | char *regexp; |
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24 | int fs_type; |
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25 | int explicit; /* 0 = don't care, 1 = explicit */ |
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26 | /* only, -1 = no explicit only */ |
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27 | char *tab_data; |
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28 | } tab[MAXFILTAB]; |
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29 | int idx; /* Index to next free entry */ |
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30 | } nosuidtab, allowtab, goodmntpt, fsdb, optionsdb; |
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31 | |
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32 | static char data_t[] = "#!TRUE"; |
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33 | |
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34 | struct uid_tab { |
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35 | int tab[MAXTRUIDTAB]; |
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36 | int idx; |
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37 | } trusted_uid; /* trusted uid table */ |
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38 | |
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39 | /* |
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40 | * Define the keyword table |
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41 | */ |
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42 | static void parse_boolean(), parse_string(), parse_uidlist(), parse_fslist(); |
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43 | static void parse_fslista(); |
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44 | static int get_fstype(); |
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45 | |
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46 | struct key_def { |
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47 | char *key; |
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48 | void (*proc)(); |
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49 | caddr_t variable; |
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50 | int arg; |
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51 | } keyword_list[] = { |
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52 | {"verbose", parse_boolean, (caddr_t) &verbose, 1 }, |
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53 | {"debug", parse_boolean, (caddr_t) &debug_flag, 1 }, |
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54 | {"ownercheck", parse_boolean, (caddr_t) &owner_check, 1 }, |
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55 | {"ownerlist", parse_boolean, (caddr_t) &owner_list, 1 }, |
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56 | {"keep-mount", parse_boolean, (caddr_t) &keep_mount, 1 }, |
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57 | {"explicit-mntpt", parse_boolean, (caddr_t) &exp_mntpt, 1 }, |
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58 | {"explicit", parse_boolean, (caddr_t) &exp_allow, 1 }, |
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59 | |
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60 | {"nfs-root-hack", parse_boolean, (caddr_t) &nfs_root_hack, 1 }, |
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61 | {"nfs-mount-dir", parse_string, (caddr_t) &nfs_mount_dir, 0 }, |
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62 | |
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63 | {"attachtab", parse_string, (caddr_t) &attachtab_fn, 0 }, |
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64 | {"mtab", parse_string, (caddr_t) &mtab_fn, 0 }, |
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65 | #ifdef AFS |
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66 | {"aklog", parse_string, (caddr_t) &aklog_fn, 0 }, |
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67 | {"afs-mount-dir", parse_string, (caddr_t) &afs_mount_dir, 0 }, |
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68 | #endif |
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69 | {"fsck", parse_string, (caddr_t) &fsck_fn, 0 }, |
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70 | |
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71 | {"trusted", parse_uidlist, (caddr_t) &trusted_uid, 0 }, |
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72 | {"nosetuid", parse_fslist, (caddr_t) &nosuidtab, 1 }, |
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73 | {"nosuid", parse_fslist, (caddr_t) &nosuidtab, 1 }, |
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74 | {"setuid", parse_fslist, (caddr_t) &nosuidtab, 0 }, |
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75 | {"suid", parse_fslist, (caddr_t) &nosuidtab, 0 }, |
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76 | {"allow", parse_fslist, (caddr_t) &allowtab, 1 }, |
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77 | {"noallow", parse_fslist, (caddr_t) &allowtab, 0 }, |
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78 | {"mountpoint", parse_fslist, (caddr_t) &goodmntpt, 1 }, |
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79 | {"nomountpoint",parse_fslist, (caddr_t) &goodmntpt, 0 }, |
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80 | |
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81 | {"filesystem", parse_fslista, (caddr_t) &fsdb, 0 }, |
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82 | {"options", parse_fslista, (caddr_t) &optionsdb, 0}, |
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83 | {NULL, NULL, NULL, 0 } |
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84 | }; |
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85 | |
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86 | static void config_abort() |
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87 | { |
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88 | fprintf(stderr, " Aborting...\n"); |
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89 | exit(ERR_BADCONF); |
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90 | } |
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91 | |
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92 | read_config_file(config_file_name) |
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93 | const char *config_file_name; |
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94 | { |
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95 | register FILE *f; |
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96 | static char buff[256]; |
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97 | char *cp; |
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98 | register char *keyword; |
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99 | char *argument; |
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100 | struct key_def *kp; |
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101 | |
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102 | allowtab.tab[0].regexp = NULL; |
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103 | nosuidtab.tab[0].regexp = NULL; |
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104 | goodmntpt.tab[0].regexp = NULL; |
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105 | fsdb.tab[0].regexp = NULL; |
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106 | trusted_uid.tab[0] = -1; |
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107 | if (debug_flag) |
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108 | printf("Reading configuration file: %s\n", config_file_name); |
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109 | if (!(f = fopen(config_file_name, "r"))) { |
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110 | if (debug_flag) |
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111 | printf("Couldn't read conf file, continuing...\n"); |
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112 | return(SUCCESS); |
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113 | } |
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114 | while (fgets(buff, sizeof(buff), f)) { |
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115 | cp = buff+strlen(buff)-1; |
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116 | while (cp >= buff && *cp < 032) |
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117 | *cp-- = '\0'; |
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118 | cp = buff; |
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119 | while (*cp && isspace(*cp)) cp++; |
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120 | if (!*cp || *cp == '#') |
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121 | continue; |
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122 | keyword = strtok(cp, TOKSEP); |
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123 | argument = strtok(NULL, TOKSEP); |
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124 | for (kp=keyword_list; kp->key; kp++) { |
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125 | if (!strcmp(kp->key, keyword)) { |
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126 | (kp->proc)(keyword,argument,buff, |
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127 | kp->variable, kp->arg); |
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128 | break; |
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129 | } |
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130 | } |
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131 | if (!kp->key) { |
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132 | if (debug_flag) |
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133 | fprintf(stderr, "%s: bad keyword in config file\n", |
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134 | keyword); |
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135 | } |
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136 | } |
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137 | return(SUCCESS); |
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138 | } |
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139 | |
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140 | static void parse_boolean(keyword, argument, buff, variable, arg) |
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141 | char *keyword, *argument, *buff; |
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142 | caddr_t variable; |
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143 | int arg; |
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144 | { |
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145 | if (argument && !strcmp(argument, "on")) |
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146 | * (int *) variable = 1; |
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147 | else if (argument && !strcmp(argument, "off")) |
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148 | * (int *) variable = 0; |
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149 | else { |
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150 | if (arg == -1) |
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151 | if (argument) |
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152 | fprintf(stderr, |
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153 | "%s: Argument to %s must be on or off!\n", |
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154 | argument, keyword); |
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155 | else |
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156 | fprintf(stderr, "%s: Argument required!\n", keyword); |
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157 | else |
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158 | * (int *) variable = arg; /* Default */ |
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159 | } |
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160 | } |
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161 | |
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162 | static void parse_string(keyword, argument, buff, variable, arg) |
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163 | char *keyword, *argument, *buff; |
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164 | caddr_t variable; |
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165 | int arg; |
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166 | { |
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167 | if (!argument || !*argument) { |
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168 | fprintf(stderr, |
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169 | "%s: missing argument in config file!\n", |
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170 | keyword); |
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171 | config_abort(); |
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172 | } |
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173 | if (* (char **) variable) |
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174 | free(* (char **) variable); |
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175 | * (char **) variable = strdup(argument); |
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176 | } |
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177 | |
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178 | static void parse_fslist(keyword, argument, buff, variable, set_sw) |
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179 | char *keyword, *argument, *buff; |
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180 | caddr_t variable; |
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181 | int set_sw; |
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182 | { |
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183 | register struct filesys_tab *fslist; |
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184 | |
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185 | fslist = (struct filesys_tab *) variable; |
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186 | while (argument && *argument) { |
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187 | if (fslist->idx >= MAXFILTAB) { |
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188 | fprintf(stderr, "Exceeded filesystem table for %s!\n", |
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189 | keyword); |
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190 | config_abort(); |
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191 | } |
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192 | fslist->tab[fslist->idx].fs_type = get_fstype(&argument, |
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193 | &fslist->tab[fslist->idx].explicit); |
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194 | fslist->tab[fslist->idx].regexp = strdup(argument); |
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195 | fslist->tab[fslist->idx].tab_data = set_sw ? data_t : NULL; |
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196 | fslist->idx++; |
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197 | argument = strtok(NULL, TOKSEP); |
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198 | } |
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199 | fslist->tab[fslist->idx].regexp = NULL; |
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200 | fslist->tab[fslist->idx].tab_data = NULL; |
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201 | } |
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202 | |
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203 | static void parse_fslista(keyword, argument, buff, variable, dummy) |
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204 | char *keyword, *argument, *buff; |
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205 | caddr_t variable; |
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206 | int dummy; |
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207 | { |
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208 | register struct filesys_tab *fslist; |
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209 | char *cp; |
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210 | |
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211 | fslist = (struct filesys_tab *) variable; |
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212 | if (fslist->idx >= MAXFILTAB) { |
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213 | fprintf(stderr, "Exceeded filesystem table for %s!\n", |
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214 | keyword); |
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215 | config_abort(); |
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216 | } |
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217 | fslist->tab[fslist->idx].fs_type = get_fstype(&argument, |
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218 | &fslist->tab[fslist->idx].explicit); |
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219 | fslist->tab[fslist->idx].regexp = strdup(argument); |
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220 | cp = strtok(NULL, ""); |
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221 | while (cp && *cp) |
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222 | if (isspace(*cp)) |
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223 | cp++; |
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224 | else |
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225 | break; |
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226 | |
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227 | if (cp && *cp) { |
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228 | fslist->tab[fslist->idx].tab_data = strdup(cp); |
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229 | } else { |
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230 | fprintf(stderr, |
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231 | "%s: missing filesystem definition in config file\n"); |
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232 | config_abort(); |
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233 | } |
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234 | fslist->idx++; |
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235 | |
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236 | fslist->tab[fslist->idx].regexp = NULL; |
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237 | fslist->tab[fslist->idx].tab_data = NULL; |
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238 | } |
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239 | |
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240 | /* |
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241 | * Parse a filesystem type specification |
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242 | * |
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243 | * Format: {nfs,afs}:tytso |
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244 | * {^ufs}:.* |
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245 | * |
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246 | */ |
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247 | static int get_fstype(cpp, explicit) |
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248 | char **cpp; |
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249 | int *explicit; |
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250 | { |
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251 | register char *cp, *ptrstart; |
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252 | register int parsing, type; |
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253 | int negate = 0; |
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254 | struct _fstypes *fs; |
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255 | int exp = 0; |
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256 | |
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257 | if (explicit) |
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258 | *explicit = 0; |
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259 | cp = *cpp; |
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260 | if (!cp || *cp++ != '{') |
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261 | return(ALL_TYPES); |
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262 | if (*cp == '+') { |
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263 | exp = 1; |
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264 | cp++; |
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265 | } else if (*cp == '-') { |
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266 | exp = -1; |
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267 | cp++; |
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268 | } |
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269 | if (explicit) |
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270 | *explicit = exp; |
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271 | if (!strchr(cp, '}')) { |
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272 | fprintf(stderr,"Error in filesystem specification:\n{%s\n", |
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273 | cp); |
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274 | config_abort(); |
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275 | } |
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276 | if (*cp == '^') { |
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277 | negate++; |
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278 | cp++; |
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279 | } |
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280 | parsing = 1; |
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281 | type = 0; |
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282 | while (parsing) { |
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283 | ptrstart = cp; |
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284 | if (!(cp = strchr(ptrstart,','))) { |
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285 | cp = strchr(ptrstart,'}'); |
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286 | parsing = 0; |
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287 | } |
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288 | *cp++ = '\0'; |
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289 | fs = get_fs(ptrstart); |
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290 | if (!fs) { |
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291 | fprintf(stderr, |
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292 | "%s: Illegal filesystem type in config file\n", |
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293 | ptrstart); |
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294 | config_abort(); |
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295 | } |
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296 | type += fs->type; |
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297 | } |
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298 | if (negate) |
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299 | type = ~type & ALL_TYPES; |
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300 | if (*cp == ':') |
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301 | cp++; |
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302 | *cpp = cp; |
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303 | return(type); |
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304 | } |
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305 | |
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306 | static void parse_uidlist(keyword, argument, buff, variable, arg) |
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307 | char *keyword, *argument, *buff; |
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308 | caddr_t variable; |
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309 | int arg; |
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310 | { |
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311 | register struct uid_tab *ul; |
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312 | int uid; |
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313 | struct passwd *pw; |
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314 | |
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315 | ul = (struct uid_tab *) variable; |
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316 | while (argument && *argument) { |
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317 | if (ul->idx >= MAXTRUIDTAB) { |
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318 | fprintf(stderr, "Exceeded user table for %s!\n", |
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319 | keyword); |
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320 | config_abort(); |
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321 | } |
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322 | if (isnumber(argument)) |
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323 | uid = atoi(argument); |
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324 | else { |
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325 | if ((pw = getpwnam(argument))) |
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326 | uid = pw->pw_uid; |
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327 | else { |
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328 | if (debug_flag) |
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329 | fprintf(stderr, |
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330 | "Unknown user %s in config file\n", |
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331 | argument); |
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332 | argument = strtok(NULL, TOKSEP); |
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333 | continue; |
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334 | } |
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335 | } |
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336 | ul->tab[ul->idx] = uid; |
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337 | ul->idx++; |
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338 | argument = strtok(NULL, TOKSEP); |
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339 | } |
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340 | ul->tab[ul->idx] = -1; |
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341 | } |
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342 | |
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343 | isnumber(s) |
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344 | register char *s; |
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345 | { |
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346 | register char c; |
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347 | |
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348 | while (c = *s++) |
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349 | if (!isdigit(c)) |
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350 | return(0); |
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351 | return(1); |
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352 | } |
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353 | |
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354 | char *re_comp(); |
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355 | |
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356 | int nosetuid_filsys(name, type) |
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357 | register char *name; |
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358 | int type; |
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359 | { |
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360 | register struct _tab *fp; |
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361 | char *retval; |
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362 | |
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363 | for (fp = nosuidtab.tab; fp->regexp; fp++) { |
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364 | if (fp->explicit && ((explicit && fp->explicit == -1) || |
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365 | (!explicit && fp->explicit == 1))) |
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366 | continue; |
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367 | if (!(fp->fs_type & type)) |
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368 | continue; |
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369 | |
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370 | if (retval=re_comp(fp->regexp)) { |
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371 | fprintf(stderr, "Nosetuid config: %s: %s", |
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372 | retval, fp->regexp); |
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373 | return(default_suid); |
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374 | } |
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375 | if (re_exec(name)) |
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376 | return(fp->tab_data ? 1 : 0); |
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377 | } |
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378 | |
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379 | return(default_suid); |
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380 | } |
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381 | |
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382 | int allow_filsys(name, type) |
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383 | register char *name; |
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384 | int type; |
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385 | { |
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386 | register struct _tab *fp; |
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387 | char *retval; |
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388 | |
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389 | |
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390 | for (fp = allowtab.tab; fp->regexp; fp++) { |
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391 | if (fp->explicit && ((explicit && fp->explicit == -1) || |
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392 | (!explicit && fp->explicit == 1))) |
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393 | continue; |
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394 | if (!(fp->fs_type & type)) |
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395 | continue; |
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396 | |
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397 | if (retval=re_comp(fp->regexp)) { |
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398 | fprintf(stderr, "Allow config: %s: %s", |
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399 | retval, fp->regexp); |
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400 | return(1); |
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401 | } |
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402 | if (re_exec(name)) |
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403 | return(fp->tab_data ? 1 : 0); |
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404 | |
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405 | } |
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406 | return(1); /* Default to allow filsystem to be mounted */ |
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407 | } |
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408 | |
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409 | int check_mountpt(name, type) |
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410 | register char *name; |
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411 | int type; |
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412 | { |
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413 | register struct _tab *fp; |
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414 | char *retval; |
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415 | |
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416 | |
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417 | for (fp = goodmntpt.tab; fp->regexp; fp++) { |
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418 | if (fp->explicit && ((explicit && fp->explicit == -1) || |
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419 | (!explicit && fp->explicit == 1))) |
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420 | continue; |
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421 | if (!(fp->fs_type & type)) |
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422 | continue; |
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423 | |
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424 | |
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425 | if (retval=re_comp(fp->regexp)) { |
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426 | fprintf(stderr, "Mountpoint config: %s: %s", |
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427 | retval, fp->regexp); |
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428 | return(1); |
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429 | } |
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430 | if (re_exec(name)) |
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431 | return(fp->tab_data ? 1 : 0); |
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432 | |
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433 | } |
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434 | return(1); /* Default to allow filsystem mounted */ |
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435 | /* anywhere */ |
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436 | } |
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437 | |
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438 | /* |
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439 | * Return true if uid is of a trusted user. |
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440 | */ |
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441 | int trusted_user(uid) |
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442 | int uid; |
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443 | { |
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444 | int *ip; |
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445 | |
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446 | ip = trusted_uid.tab; |
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447 | while (*ip >= 0) { |
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448 | if (uid == *ip) |
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449 | return(1); |
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450 | ip++; |
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451 | } |
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452 | return(uid == 0); /* Hard code root being trusted */ |
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453 | } |
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454 | |
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455 | /* |
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456 | * Look up a filesystem name and return a ``hesiod'' entry |
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457 | */ |
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458 | char **conf_filsys_resolve(name) |
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459 | char *name; |
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460 | { |
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461 | register struct _tab *fp; |
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462 | char **hp; |
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463 | static char *hesptr[32]; /* Limit 32 ``hesiod'' entries */ |
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464 | |
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465 | hp = hesptr; |
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466 | for (fp = fsdb.tab; fp->regexp; fp++) { |
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467 | if (!strcasecmp(fp->regexp, name)) |
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468 | *hp++ = strdup(fp->tab_data); |
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469 | } |
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470 | *hp = NULL; |
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471 | return(hesptr); |
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472 | } |
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473 | |
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474 | /* |
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475 | * Return the options for a particular filesystem. |
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476 | */ |
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477 | char *filsys_options(name, type) |
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478 | char *name; |
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479 | int type; |
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480 | { |
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481 | register struct _tab *fp; |
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482 | char *retval; |
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483 | |
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484 | |
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485 | for (fp = optionsdb.tab; fp->regexp; fp++) { |
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486 | if (fp->explicit && ((explicit && fp->explicit == -1) || |
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487 | (!explicit && fp->explicit == 1))) |
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488 | continue; |
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489 | if (!(fp->fs_type & type)) |
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490 | continue; |
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491 | |
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492 | |
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493 | if (retval=re_comp(fp->regexp)) { |
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494 | fprintf(stderr, "Mountpoint config: %s: %s", |
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495 | retval, fp->regexp); |
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496 | config_abort(); |
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497 | } |
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498 | if (re_exec(name)) |
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499 | return(fp->tab_data); |
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500 | |
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501 | } |
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502 | return(NULL); |
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503 | } |
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