1 | |
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2 | /* copied from abac_graph.c |
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3 | implementation of the low level using |
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4 | yap prolog |
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5 | */ |
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6 | |
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7 | #include <err.h> |
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8 | #include <stdio.h> |
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9 | #include <assert.h> |
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10 | #include <stdlib.h> |
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11 | #include <string.h> |
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12 | #include <Yap/YapInterface.h> |
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13 | |
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14 | #include "abac_pl.h" |
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15 | #include "abac_pl_yap.h" |
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16 | |
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17 | #include "abac_list.h" |
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18 | #include "abac_util.h" |
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19 | |
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20 | #include "uthash.h" |
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21 | |
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22 | extern char *abac_cn_with_role(abac_role_t *); |
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23 | |
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24 | // pl |
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25 | struct _abac_pl_t { |
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26 | FILE *fptr; |
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27 | char *fname; |
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28 | char *yap_certs; |
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29 | }; |
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30 | |
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31 | static int _insert_clause(char *str) |
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32 | { |
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33 | YAP_Term eterm; |
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34 | YAP_Term goalArgs=YAP_ReadBuffer(str, eterm); |
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35 | char *tmp=YAP_CompileClause(goalArgs); |
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36 | if (tmp!=NULL) { /* something is wrong */ |
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37 | printf("error: result of compile clause (%s)\n", tmp); |
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38 | printf("error: str used (%s)\n", str); |
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39 | return 1; |
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40 | } |
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41 | return 0; |
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42 | } |
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43 | |
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44 | static int _insert_cred_clause(char *cstr) |
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45 | { |
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46 | int ret=ABAC_CERT_SUCCESS; |
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47 | int rc=_insert_clause(cstr); |
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48 | if (rc) |
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49 | return ABAC_CERT_BAD_YAP; |
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50 | return ABAC_CERT_SUCCESS; |
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51 | } |
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52 | |
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53 | static void _show_yap_db(char *msg) |
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54 | { |
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55 | char lstr[]="listing"; |
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56 | YAP_Term *eterm; |
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57 | |
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58 | printf("\n\n========= yap db (%s)\n",msg); |
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59 | YAP_Term goal=YAP_ReadBuffer(lstr, eterm); |
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60 | int rc =YAP_RunGoal( goal ); |
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61 | if (rc) { |
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62 | printf("listing ok.. \n"); |
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63 | } else { |
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64 | printf("listing's rc is bad.. \n"); |
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65 | YAP_Exit(1); |
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66 | } |
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67 | printf("========= \n\n"); |
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68 | } |
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69 | |
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70 | static void _set_dbg(abac_pl_t *pl) |
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71 | { |
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72 | char *fname=strdup( "/tmp/abac_yap-XXXXXX.pl" ); |
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73 | int fd = mkstemps( pl->fname, 3 ); |
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74 | if ( fd == -1) { |
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75 | printf("Couldn't get a valid temp name %s\n", fname); |
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76 | free((void*)fname); |
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77 | YAP_Exit(1); |
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78 | } |
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79 | FILE *fptr = fdopen(fd, "w"); |
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80 | if (fptr == NULL) { |
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81 | printf("Couldn't open %s for writing\n", fname); |
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82 | free((void*)fname); |
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83 | YAP_Exit(1); |
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84 | } |
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85 | pl->fptr=fptr; |
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86 | pl->fname=fname; |
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87 | } |
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88 | |
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89 | /** |
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90 | * Include some utility routines |
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91 | */ |
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92 | abac_pl_t *abac_pl_utility(void) { |
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93 | /* |
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94 | append([],L,L). |
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95 | append([X|L1],L2,[X|L3]):-append(L1,L2,L3). |
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96 | |
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97 | appendL([],[]). |
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98 | appendL([H|T], L) :- |
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99 | appendL(T,L2), append(H,L2,L). |
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100 | */ |
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101 | if(_insert_clause("append([],L,L)")) |
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102 | YAP_Exit(1); |
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103 | if(_insert_clause("append([X|L1],L2,[X|L3]):-append(L1,L2,L3)")) |
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104 | YAP_Exit(1); |
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105 | if(_insert_clause("appendL([],[])")) |
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106 | YAP_Exit(1); |
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107 | if(_insert_clause("appendL([H|T], L) :- appendL(T,L2), append(H,L2,L)")) |
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108 | YAP_Exit(1); |
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109 | } |
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110 | |
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111 | /** |
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112 | * Create a new yap structure. |
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113 | */ |
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114 | abac_pl_t *abac_pl_new(void) { |
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115 | |
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116 | if (YAP_FastInit(NULL) == YAP_BOOT_ERROR) |
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117 | YAP_Exit(1); |
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118 | |
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119 | if (YAP_RunGoal(YAP_MkAtomTerm(YAP_LookupAtom("source")))) { |
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120 | printf("calling source..\n"); |
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121 | } else { |
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122 | printf("calling source failed..\n"); |
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123 | YAP_Exit(1); |
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124 | } |
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125 | |
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126 | abac_pl_utility(); |
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127 | |
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128 | abac_pl_t *pl = abac_xmalloc(sizeof(abac_pl_t)); |
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129 | pl->fptr=NULL; |
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130 | pl->fname=NULL; |
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131 | pl->yap_certs=NULL; |
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132 | return pl; |
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133 | } |
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134 | |
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135 | /** |
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136 | * Add a credential to the credential pl. |
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137 | */ |
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138 | int abac_pl_add_credential(abac_pl_t *pl, abac_credential_t *cred) |
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139 | { |
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140 | int rc=0; |
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141 | char *str = abac_credential_clause(cred); |
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142 | if (str != NULL) { |
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143 | rc=_insert_cred_clause(str); |
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144 | } |
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145 | _show_yap_db("calling within abac_pl_add_credential"); |
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146 | return rc; |
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147 | } |
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148 | |
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149 | /* cases, |
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150 | ['str'] |
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151 | ['str1','str2'] |
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152 | ([] is not possible, and don't care) |
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153 | */ |
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154 | static void _credentials_from_string(abac_list_t *credentials,char *slist) { |
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155 | char *cptr=slist; /* current ptr */ |
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156 | char *sptr; /* string ptr */ |
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157 | char *ptr; |
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158 | int len=strlen(ptr); |
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159 | char *string; |
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160 | abac_credential_t *cred=NULL; |
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161 | |
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162 | /* find first [' */ |
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163 | ptr=strstr(cptr,"['"); |
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164 | if(ptr == NULL) |
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165 | return; |
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166 | cptr=ptr+2; |
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167 | sptr=cptr; |
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168 | while (1) { |
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169 | /* find next ',' or '] */ |
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170 | ptr=strstr(cptr,"','"); |
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171 | if(ptr!=NULL) { |
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172 | cptr=ptr+3; |
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173 | len=ptr-sptr; |
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174 | string=strndup(sptr,len); |
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175 | cred=abac_credential_lookup(string); |
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176 | if(cred) { |
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177 | abac_list_add(credentials, abac_credential_dup(cred)); |
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178 | } else { |
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179 | printf("BAD BAD BAD\n"); |
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180 | } |
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181 | sptr=cptr; |
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182 | } else { |
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183 | ptr=strstr(cptr,"']"); |
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184 | if(ptr!=NULL) { |
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185 | len=ptr-sptr; |
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186 | string=strndup(sptr,len); |
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187 | cred=abac_credential_lookup(string); |
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188 | if(cred) { |
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189 | abac_list_add(credentials, abac_credential_dup(cred)); |
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190 | } else { |
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191 | printf("BAD BAD BAD\n"); |
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192 | } |
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193 | break; |
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194 | } |
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195 | } |
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196 | } |
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197 | } |
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198 | |
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199 | /* 2 types |
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200 | acme.buys_rocket <- coyote |
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201 | acme.buys_rocket <- acme.preferred_customer -- NOT DONE YET */ |
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202 | static abac_list_t *_query(abac_pl_t *pl, abac_role_t* role, abac_role_t* role_prin ) |
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203 | { |
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204 | YAP_Term *eterm; |
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205 | YAP_Term arg[3]; |
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206 | char tmp[1000]; |
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207 | abac_list_t *cred_list = NULL; |
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208 | |
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209 | char *cn_prin=abac_cn_with_role(role_prin); |
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210 | char *cn_role=abac_cn_with_role(role); |
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211 | |
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212 | if(abac_role_role_name(role_prin)!=NULL) { |
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213 | printf("fail, query's call need proper principal id !!!\n"); |
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214 | YAP_Exit(1); |
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215 | } |
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216 | |
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217 | if (cn_prin == NULL || cn_role == NULL) { |
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218 | printf("fail, query's call got bad roles.. \n"); |
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219 | YAP_Exit(1); |
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220 | } |
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221 | sprintf(tmp,"role(%s,%s)", cn_role, abac_role_role_name(role)); |
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222 | arg[0]=YAP_MkAtomTerm(YAP_LookupAtom(cn_prin)); |
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223 | arg[1]=YAP_ReadBuffer(tmp,eterm); |
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224 | arg[2]=YAP_MkVarTerm(); |
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225 | YAP_Atom f = YAP_LookupAtom("isMember"); |
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226 | YAP_Functor func = YAP_MkFunctor(f, 3); |
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227 | YAP_Term goal=YAP_MkApplTerm(func, 3, arg); |
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228 | int rc =YAP_RunGoal( goal ); |
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229 | if (rc) { |
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230 | cred_list = abac_list_new(); |
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231 | printf("success, query call ok.. \n"); |
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232 | YAP_WriteBuffer(arg[2], tmp, 1000,YAP_WRITE_HANDLE_VARS); |
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233 | /* printf(" answer : %s(%d)\n", tmp, strlen(tmp)); */ |
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234 | /* this is returned as ['string1','string2'] */ |
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235 | _credentials_from_string(cred_list,tmp); |
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236 | while (YAP_RestartGoal()) { |
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237 | printf("another success\n"); |
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238 | YAP_WriteBuffer(arg[2], tmp, 1000,YAP_WRITE_HANDLE_VARS); |
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239 | /* printf(" answer : %s\n", tmp); */ |
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240 | _credentials_from_string(cred_list,tmp); |
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241 | } |
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242 | } else { |
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243 | printf("fail, query's call is bad.. \n"); |
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244 | YAP_Exit(1); |
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245 | } |
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246 | return cred_list; |
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247 | } |
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248 | |
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249 | /** |
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250 | * Make a query into prolog db |
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251 | --role acme.preferred_customer --principal coyote |
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252 | --role acme.prefer_customer.buy_rockets --principlal coyote |
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253 | */ |
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254 | abac_list_t *abac_pl_query(abac_pl_t *pl, char *role_name, char *principal) |
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255 | { |
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256 | abac_role_t *role = abac_role_from_string(role_name); |
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257 | abac_role_t *prin_role = abac_role_from_string(principal); |
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258 | char *query_clause = NULL; |
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259 | abac_list_t *ret=NULL; |
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260 | |
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261 | // give up on bogus roles |
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262 | if (role == NULL || prin_role == NULL) { |
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263 | free(role); |
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264 | free(prin_role); |
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265 | return NULL; |
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266 | } |
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267 | |
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268 | ret=_query(pl,role,prin_role); |
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269 | |
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270 | return ret; |
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271 | } |
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272 | |
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273 | /** |
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274 | * Get all the credentials (attribute/issuer cert pairs) from prolog |
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275 | * (which returns in string form) |
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276 | */ |
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277 | abac_list_t *abac_pl_credentials(abac_pl_t *pl) { |
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278 | abac_list_t *credentials = abac_list_new(); |
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279 | /* fix up a stream to stream the credentials from prolog engine */ |
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280 | return credentials; |
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281 | } |
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282 | |
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283 | void abac_pl_free(abac_pl_t *pl) { |
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284 | if(pl->fptr) { |
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285 | fflush(pl->fptr); |
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286 | free(pl->fptr); |
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287 | } |
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288 | if(pl->fname) { |
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289 | unlink(pl->fname); |
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290 | free(pl->fname); |
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291 | } |
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292 | free(pl); |
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293 | } |
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294 | |
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