Re: module writing / compiling problems?

[Jason Gerfen <jason.gerfen@xxxxxxxxxxxx>]

Jason Gerfen wrote:

> I am doing something wrong as it comes to writting a pam module.  If 
> anyone can tell me what I am doing wrong, it would be greatly 
> appreciated.
>
> This module does one thing, on the pam_sm_authenticate() function it 
> attempts to call the pam_get_user() function and on success or failure 
> it logs it to syslog using a _pam_log() function.
>
> Here is the code:  File is named lame.c
> [SNIP]
> #include <stdio.h>
> #include <syslog.h>
> #include <stdarg.h>
>
> #define PAM_SM_AUTH
>
> #include <pam_modules.h>
>
> static void _pam_log(int err, const char *format, ...)
> {
>    va_list  args;
>
>    va_start(args, format);
>    openlog("PAM-lame", LOG_CONS | LOG_PID, LOG_AUTHPRIV);
>    syslog(err, format, args);
>    va_end(args);
>    closelog();
> }
>
> PAM_EXTERN
> int pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc,
>            const char **argv)
> {
>    int retval;
>    const char *user;
>
>    if((retval = pam_get_user(pamh, &user, "looser login:") != 
> PAM_SUCCESS)) {
>    _pam_log(LOG_ERR, "Cannot obtain user name: %s",
>         pam_strerror(pamh, retval));
>    return(PAM_AUTHINFO_UNAVAIL); }
>
>    if((retval = pam_get_user(pamh, &user, "looser login:") == 
> PAM_SUCCESS)) {
>        _pam_log(LOG_ERR, "Obtained username: %s",
>         pam_strerror(pamh, retval));
>        return(PAM_SUCCESS); }
>
>    _pam_log(LOG_ERR, "Just checking", pam_strerror(pamh, retval));
>
>    return retval;
>
> }
>
> #ifdef PAM_STATIC
> struct pam_module _pam_looser_modstruct = {
>    "pam_looser",
>    pam_sm_authenticate,
>    NULL,
>    NULL,
>    NULL,
>    NULL,
>    NULL,
> };
> #endif
> [/SNIP]
>
> And I am compiling using a simply Makefile listed below:
> Any help tips, pointers etc would be greatly appreciated.  Also if 
> there is a "typo" please disregard as on the production box it 
> compiles just fine, and of couse I do have it added to the 
> /etc/pam.d/login file like so:
>
> auth required pam_looser.so
>
> Thanks in advance,
Oops, I forgot the makefile
[SNIP]
CC=gcc
CFLAGS=-fPIC
LDFLAGS=-x --shared
LIBS=-lwrap -lpam -lc
SRCS=lame.c
OBJS=lame.o
LIBSHARED=pam_looser.so
SECUREDIRECTORY=/lib/security
SECUREMODE=644
INSTALL=install

all: $(LIBSHARED)

install: all
   $(INSTALL) -m $(SECUREMODE) $(LIBSHARED) $(SECUREDIRECTORY)

$(LIBSHARED): $(OBJS)
   $(LD) $(LDFLAGS) -o $@ $? $(LIBS)

$(OBJS): $(SRCS)
   $(CC) $(CFLAGS) -o $@ -c $*.c

clean:
   rm -f $(OBJS) $(LIBSHARED) a.out core *~
[/SNIP]

--
Jason Gerfen

"...Sometimes I just yell at myself. And it
makes me sad, sometimes I make myself cry..."
			~ My nephew Dawsyn



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