diff options
| -rw-r--r-- | modules/Makefile | 2 | ||||
| -rw-r--r-- | modules/pam_deny/Makefile | 1 | ||||
| -rw-r--r-- | modules/pam_nologin/Makefile | 1 | ||||
| -rw-r--r-- | modules/pam_permit/Makefile | 1 | ||||
| -rw-r--r-- | modules/pam_rootok/Makefile | 1 | ||||
| -rw-r--r-- | modules/pam_securetty/Makefile | 1 | ||||
| -rw-r--r-- | modules/pam_shells/pam_shells.c | 74 | ||||
| -rw-r--r-- | modules/pam_unix/Makefile | 1 |
8 files changed, 74 insertions, 8 deletions
diff --git a/modules/Makefile b/modules/Makefile index 3b5ace0..d985659 100644 --- a/modules/Makefile +++ b/modules/Makefile @@ -2,7 +2,7 @@ all install clean: $(MAKE) -C pam_unix $@ $(MAKE) -C pam_securetty $@ $(MAKE) -C pam_nologin $@ -# $(MAKE) -C pam_shells $@ + $(MAKE) -C pam_shells $@ # $(MAKE) -C pam_wheel $@ $(MAKE) -C pam_rootok $@ $(MAKE) -C pam_permit $@ diff --git a/modules/pam_deny/Makefile b/modules/pam_deny/Makefile index 4ebffb1..4fa5c5f 100644 --- a/modules/pam_deny/Makefile +++ b/modules/pam_deny/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac diff --git a/modules/pam_nologin/Makefile b/modules/pam_nologin/Makefile index 981d3ae..2324da2 100644 --- a/modules/pam_nologin/Makefile +++ b/modules/pam_nologin/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac diff --git a/modules/pam_permit/Makefile b/modules/pam_permit/Makefile index 793e176..1d8b0bb 100644 --- a/modules/pam_permit/Makefile +++ b/modules/pam_permit/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac diff --git a/modules/pam_rootok/Makefile b/modules/pam_rootok/Makefile index 6115401..986dea7 100644 --- a/modules/pam_rootok/Makefile +++ b/modules/pam_rootok/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac diff --git a/modules/pam_securetty/Makefile b/modules/pam_securetty/Makefile index f382e4c..e2b85f7 100644 --- a/modules/pam_securetty/Makefile +++ b/modules/pam_securetty/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac diff --git a/modules/pam_shells/pam_shells.c b/modules/pam_shells/pam_shells.c index 8b1397c..cce6824 100644 --- a/modules/pam_shells/pam_shells.c +++ b/modules/pam_shells/pam_shells.c @@ -11,8 +11,80 @@ #include <security/pam_modules.h> #include <security/pam_mod_misc.h> +#define SHELLS "/etc/shells" + PAM_EXTERN int pam_sm_authenticate(pam_handle_t * pamh, int flags, - int argc, const char * argv[]) + int argc, const char * argv[]) +{ + struct passwd *pwd; + struct stat shellfileinfo; + const char *user; + const char *shell; + char shellfileline[256]; + FILE *shellfile; + int pam_err; + + if ( ( (pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS ) + || ( user == NULL ) ) { + PAM_ERROR("Error recovering username."); + return (pam_err); + } + + if ( (pwd = getpwnam(user)) == NULL ) { + PAM_ERROR("Could not get passwd entry for user [%s]",user); + return (PAM_SERVICE_ERR); + } + + shell = pwd->pw_shell; + + if ( stat(SHELLS, &shellfileinfo) ) { + PAM_ERROR("Could not open SHELLS file :%s", SHELLS); + return (PAM_AUTH_ERR); + } + + if ((shellfileinfo.st_mode & S_IWOTH) || !S_ISREG(shellfileinfo.st_mode)) { + /* File is either world writable or not a regural file */ + PAM_ERROR("SHELLS file cannot be trusted!"); + return (PAM_AUTH_ERR); + } + + /* Open read-only file with shells */ + if ( (shellfile = fopen(SHELLS,"r")) == NULL ) { + PAM_ERROR("Could not open SHELLS file :%s", SHELLS); + return (PAM_SERVICE_ERR); + } + + pam_err = 1; + + /* Search in SHELLS for user shell */ + while (fgets(shellfileline, sizeof(shellfileline)-1, shellfile) != NULL + && pam_err) { + if (shellfileline[strlen(shellfileline) - 1] == '\n') + shellfileline[strlen(shellfileline) - 1] = '\0'; + + pam_err = strcmp(shellfileline, shell); + + } + + fclose(shellfile); + + if (!pam_err) { + /* user shell found in SHELLS. Allow access */ + PAM_LOG("Access granted for %s with shell %s.", user, shell); + return (PAM_SUCCESS); + } + + return (PAM_AUTH_ERR); +} + + +PAM_EXTERN int +pam_sm_setcred(pam_handle_t *pamh , int flags , + int argc , const char *argv[]) { + return (PAM_SUCCESS); +} + +PAM_MODULE_ENTRY("pam_shells"); diff --git a/modules/pam_unix/Makefile b/modules/pam_unix/Makefile index ae80af4..34ed3f0 100644 --- a/modules/pam_unix/Makefile +++ b/modules/pam_unix/Makefile @@ -23,7 +23,6 @@ all: case "`uname -s`" in \ Linux) $(MAKE) CFLAGS="$(CFLAGS)" LDFLAGS="$(LDFLAGS)" \ LDLIBS="$(LDLIBS)" $(PROJ);;\ - FreeBSD) echo "Not yet supported.";;\ *) echo "OS not supported.";;\ esac |