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Misc UtilitiesHow to Check...
This example code will check a user password to see if it is the correct password for a given user. You'll need to link with the crypt lib in order for this to work.
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Misc UtilitiesHow to Check...How to Check a User Password on Linux
Saturday, July 17, 2004 by digitalpeer, updated Saturday, July 31, 2004
#include <stdlib.h>
#include <stdio.h>
#include <pwd.h>
#include <shadow.h>
/** Grab the shadow password */
struct spwd *getspuid(uid_t pw_uid)
{
struct spwd *shadow;
struct passwd *ppasswd;
if( ((ppasswd = getpwuid(pw_uid)) == NULL)
|| ((shadow = getspnam(ppasswd->pw_name)) == NULL))
return NULL;
return shadow;
}
/* given a plaintext password and an encrypted password, check if
* they match; returns 1 if they match, 0 otherwise.
*/
int check_pass(const char *plainpw, const char *cryptpw)
{
return strcmp(crypt(plainpw,cryptpw), cryptpw) == 0;
}Related Local Pages
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