contrib/pam_passwdqc/pam_macros.h

   1 /*
   2  * These macros are partially based on Linux-PAM's <security/_pam_macros.h>,
   3  * which were organized by Cristian Gafton and I believe are in the public
   4  * domain.
   5  *
   6  * - Solar Designer
   7  */
   8
   9 #ifndef PAM_PASSWDQC_MACROS_H__
  10 #define PAM_PASSWDQC_MACROS_H__
  11
  12 #include <string.h>
  13 #include <stdlib.h>
  14
  15 static __inline void
  16 pwqc_overwrite_string(char *x)
  17 {
  18         if (x)
  19                 memset(x, 0, strlen(x));
  20 }
  21
  22 static __inline void
  23 pwqc_drop_mem(void *x)
  24 {
  25         if (x) {
  26                 free(x);
  27                 x = NULL;
  28         }
  29 }
  30
  31 static __inline void
  32 pwqc_drop_pam_reply(struct pam_response *reply, int replies)
  33 {
  34         if (reply) {
  35                 int reply_i;
  36
  37                 for (reply_i = 0; reply_i < replies; ++reply_i) {
  38                         pwqc_overwrite_string(reply[reply_i].resp);
  39                         pwqc_drop_mem(reply[reply_i].resp);
  40                 }
  41                 pwqc_drop_mem(reply);
  42         }
  43 }
  44
  45 #endif /* PAM_PASSWDQC_MACROS_H__ */