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
   7 #ifndef PAM_PASSWDQC_MACROS_H__
   8 #define PAM_PASSWDQC_MACROS_H__
   9
  10 #include <string.h>
  11 #include <stdlib.h>
  12
  13 static __inline void
  14 pwqc_overwrite_string(char *x)
  15 {
  16         if (x)
  17                 memset(x, 0, strlen(x));
  18 }
  19
  20 static __inline void
  21 pwqc_drop_mem(void *x)
  22 {
  23         if (x) {
  24                 free(x);
  25                 x = NULL;
  26         }
  27 }
  28
  29 static __inline void
  30 pwqc_drop_pam_reply(struct pam_response *reply, int replies)
  31 {
  32         if (reply) {
  33                 int reply_i;
  34
  35                 for (reply_i = 0; reply_i < replies; ++reply_i) {
  36                         pwqc_overwrite_string(reply[reply_i].resp);
  37                         pwqc_drop_mem(reply[reply_i].resp);
  38                 }
  39                 pwqc_drop_mem(reply);
  40         }
  41 }
  42
  43 #endif /* PAM_PASSWDQC_MACROS_H__ */