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 #define pwqc_overwrite_string(x) \
  14 do { \
  15         if (x) \
  16                 memset((x), 0, strlen(x)); \
  17 } while (0)
  18
  19 #define pwqc_drop_mem(x) \
  20 do { \
  21         if (x) { \
  22                 free(x); \
  23                 (x) = NULL; \
  24         } \
  25 } while (0)
  26
  27 #define pwqc_drop_pam_reply(/* struct pam_response* */ reply, /* int */ replies) \
  28 do { \
  29         if (reply) { \
  30                 int reply_i; \
  31 \
  32                 for (reply_i = 0; reply_i < (replies); ++reply_i) { \
  33                         pwqc_overwrite_string((reply)[reply_i].resp); \
  34                         pwqc_drop_mem((reply)[reply_i].resp); \
  35                 } \
  36                 pwqc_drop_mem(reply); \
  37         } \
  38 } while (0)
  39
  40 #endif /* PAM_PASSWDQC_MACROS_H__ */