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| 28 | #include <stdio.h> |
| 29 | #include <X11/Xos.h> |
| 30 | #include <errno(*__error()).h> |
| 31 | #include <stdlib.h> |
| 32 | #include <ctype.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/wait.h> |
| 35 | |
| 36 | #include "server.h" |
| 37 | |
| 38 | static char *Strupr ( char *s0 ); |
| 39 | static struct auth_info *find_or_create_auth ( char *s ); |
| 40 | static char * expand ( char *s, int ac, char **av ); |
| 41 | |
| 42 | struct list_of_argv { |
| 43 | struct list_of_argv *next; |
| 44 | int argc; |
| 45 | char **argv; |
| 46 | }; |
| 47 | |
| 48 | struct auth_info { |
| 49 | struct auth_info *next; |
| 50 | char *name; |
| 51 | struct list_of_argv *data; |
| 52 | char **program; |
| 53 | char **input; |
| 54 | }; |
| 55 | |
| 56 | struct auth_info *auth_schemes = NULL((void *)0); |
| 57 | |
| 58 | static char * |
| 59 | Strupr(char *s0) |
| 60 | { |
| 61 | char *s; |
| 62 | |
| 63 | for(s = s0; *s; s++) { |
| 64 | if(islower(*s)) *s = toupper(*s); |
| 65 | } |
| 66 | return s0; |
| 67 | } |
| 68 | |
| 69 | |
| 70 | |
| 71 | struct auth_info * |
| 72 | find_or_create_auth(char *s) |
| 73 | { |
| 74 | struct auth_info *auth; |
| 75 | |
| 76 | Strupr(s); |
| 77 | |
| 78 | for(auth = auth_schemes; auth; auth=auth->next) { |
| 4 | | Loop condition is false. Execution continues on line 82 | |
|
| 79 | if(!strcmp(s, auth->name)) return auth; |
| 80 | } |
| 81 | |
| 82 | auth = (struct auth_info *)malloc(sizeof(*auth)); |
| 5 | | Value assigned to 'auth' | |
|
| 83 | if(!auth) nomem(); |
| |
| |
| 84 | |
| 85 | auth->next = auth_schemes; |
| 8 | | Access to field 'next' results in a dereference of a null pointer (loaded from variable 'auth') |
|
| 86 | auth->name = s; |
| 87 | auth->data = NULL((void *)0); |
| 88 | auth->program = NULL((void *)0); |
| 89 | auth->input = NULL((void *)0); |
| 90 | auth_schemes = auth; |
| 91 | |
| 92 | return auth; |
| 93 | } |
| 94 | |
| 95 | void |
| 96 | key_auth(int ac, char **av) |
| 97 | { |
| 98 | struct list_of_argv *lav; |
| 99 | struct auth_info *auth; |
| 100 | |
| 101 | if(ac < 2) { |
| 102 | printf( |
| 103 | "%s: Failure: Malformed AUTH\n",myname); |
| 104 | exit(255); |
| 105 | } |
| 106 | |
| 107 | auth = find_or_create_auth(av[1]); |
| 108 | |
| 109 | lav = (struct list_of_argv *)malloc(sizeof(*lav)); |
| 110 | if(!lav) nomem(); |
| 111 | |
| 112 | lav->next = auth->data; |
| 113 | lav->argc = ac-2; |
| 114 | lav->argv = av+2; |
| 115 | auth->data = lav; |
| 116 | } |
| 117 | |
| 118 | void |
| 119 | key_internal_auth_program(int ac, char **av) |
| 120 | { |
| 121 | struct auth_info *auth; |
| 122 | |
| 123 | if(ac < 4) { |
| |
| |
| 124 | printf( |
| 125 | "%s: Failure: Malformed INTERNAL-AUTH-PROGRAM\n",myname); |
| 126 | exit(255); |
| 127 | } |
| 128 | |
| 129 | auth = find_or_create_auth(av[1]); |
| 3 | | Calling 'find_or_create_auth' | |
|
| 130 | auth->program = av + 2; |
| 131 | } |
| 132 | |
| 133 | void |
| 134 | key_internal_auth_input(int ac, char **av) |
| 135 | { |
| 136 | struct auth_info *auth; |
| 137 | |
| 138 | if(ac < 2) { |
| 139 | printf( |
| 140 | "%s: Failure: Malformed INTERNAL-AUTH-INPUT\n",myname); |
| 141 | exit(255); |
| 142 | } |
| 143 | |
| 144 | auth = find_or_create_auth(av[1]); |
| 145 | auth->input = av + 2; |
| 146 | } |
| 147 | |
| 148 | void |
| 149 | do_auth(void) |
| 150 | { |
| 151 | struct auth_info *auth; |
| 152 | int p[2]; |
| 153 | char **pp; |
| 154 | struct list_of_argv *lav; |
| 155 | char *s; |
| 156 | int pid; |
| 157 | int status; |
| 158 | |
| 159 | for(auth = auth_schemes; auth; auth = auth->next) { |
| 160 | if(!auth->data) continue; |
| 161 | if(!auth->program) { |
| 162 | printf( |
| 163 | "%s: Warning: no %s authorization program specified in this context\n",myname, |
| 164 | auth->name); |
| 165 | continue; |
| 166 | } |
| 167 | |
| 168 | if(pipe(p)) { |
| 169 | printf("%s: Error: pipe - %s\n",myname, strerror(errno(*__error()))); |
| 170 | exit(255); |
| 171 | } |
| 172 | |
| 173 | fflush(stdout__stdoutp); |
| 174 | |
| 175 | switch(pid = fork()) { |
| 176 | case -1: |
| 177 | printf("%s: Error: fork - %s\n",myname, strerror(errno(*__error()))); |
| 178 | exit(255); |
| 179 | case 0: |
| 180 | close(0); |
| 181 | dup(p[0]); |
| 182 | close(p[0]); |
| 183 | close(p[1]); |
| 184 | execvp(auth->program[0], auth->program+1); |
| 185 | printf("%s: Error: %s - %s\n",myname, auth->program[0], |
| 186 | strerror(errno(*__error()))); |
| 187 | exit(255); |
| 188 | break; |
| 189 | default: |
| 190 | close(p[0]); |
| 191 | for(lav = auth->data; lav; lav=lav->next) { |
| 192 | for(pp = auth->input; *pp; pp++) { |
| 193 | s = expand(*pp, lav->argc, lav->argv); |
| 194 | write(p[1], s, strlen(s)); |
| 195 | write(p[1], "\n", 1); |
| 196 | } |
| 197 | } |
| 198 | close(p[1]); |
| 199 | while(wait(&status) != pid) ; |
| 200 | if(status) { |
| 201 | printf( |
| 202 | "%s: Warning: %s authorization setup failed\n",myname, auth->name); |
| 203 | } |
| 204 | break; |
| 205 | } |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | char * |
| 210 | expand(char *s, int ac, char **av) |
| 211 | { |
| 212 | static char buf[BUFSIZ1024]; |
| 213 | char *p; |
| 214 | int i; |
| 215 | |
| 216 | p = buf; |
| 217 | while(*s) { |
| 218 | if(*s == '$') { |
| 219 | s++; |
| 220 | if(*s == '$') { |
| 221 | *p++ = *s++; |
| 222 | continue; |
| 223 | } |
| 224 | if(!isdigit(*s)) { |
| 225 | printf( |
| 226 | "%s: Failure: bad $ in configuration: non-digit after $\n",myname); |
| 227 | exit(255); |
| 228 | } |
| 229 | i = (int)strtol(s, &s, 10); |
| 230 | if(i > ac) { |
| 231 | printf( |
| 232 | "%s: Failure: not enough arguments to AUTH\n",myname); |
| 233 | exit(255); |
| 234 | } |
| 235 | strcpy(p, av[i-1])__builtin___strcpy_chk (p, av[i-1], __builtin_object_size (p, 2 > 1 ? 1 : 0)); |
| 236 | p += strlen(p); |
| 237 | } else *p++ = *s++; |
| 238 | } |
| 239 | *p = '\0'; |
| 240 | |
| 241 | return buf; |
| 242 | } |