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implement forking for the authentication process

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hidden behind new option fork
This commit is contained in:
Klas Lindfors 2016-02-16 09:25:30 +01:00
parent 19631c2efc
commit d53bb19f93
1 changed files with 41 additions and 0 deletions
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41
pam_yubico.c
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@ -36,6 +36,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
@ -127,6 +128,7 @@ struct cfg
unsigned int token_id_length;
enum key_mode mode;
const char *chalresp_path;
int fork;
};
#ifdef DBG
@ -745,6 +747,8 @@ parse_cfg (int flags, int argc, const char **argv, struct cfg *cfg)
cfg->mode = CLIENT;
if (strncmp (argv[i], "chalresp_path=", 14) == 0)
cfg->chalresp_path = argv[i] + 14;
if (strcmp (argv[i], "fork") == 0)
cfg->fork = 1;
}
if (cfg->debug)
@ -779,6 +783,7 @@ parse_cfg (int flags, int argc, const char **argv, struct cfg *cfg)
D (("token_id_length=%d", cfg->token_id_length));
D (("mode=%s", cfg->mode == CLIENT ? "client" : "chresp" ));
D (("chalresp_path=%s", cfg->chalresp_path ? cfg->chalresp_path : "(null)"));
D (("fork=%d", cfg->fork));
}
}
@ -809,6 +814,39 @@ pam_sm_authenticate (pam_handle_t * pamh,
parse_cfg (flags, argc, argv, cfg);
if (cfg->fork)
{
pid_t pid = fork();
if (pid < 0)
{
DBG (("fork failed!"));
return PAM_AUTHINFO_UNAVAIL;
}
if (pid > 0)
{
int status;
DBG (("parent waiting for status."));
waitpid(pid, &status, 0);
if (WIFEXITED(status))
{
retval = WEXITSTATUS(status);
DBG (("child exited normally with status %d", retval));
}
else if (WIFSIGNALED(status))
{
syslog (LOG_ERR, "Authentication process died on signal %d", WTERMSIG(status));
DBG (("child exited with signal %d", WTERMSIG(status)));
retval = PAM_AUTHINFO_UNAVAIL;
}
else
{
DBG (("child status unknown"));
retval = PAM_AUTHINFO_UNAVAIL;
}
return retval;
}
}
DBG (("pam_yubico version: %s", VERSION));
if (cfg->token_id_length > MAX_TOKEN_ID_LEN)
@ -1114,6 +1152,9 @@ done:
free((char*)msg[0].msg);
}
if(cfg->fork) {
exit(retval);
}
return retval;
}