agetty: Load autologin user from agetty.autologin credential

Let's check if we've been passed credentials by systemd and if so,
try to read the user to autologin from the agetty.autologin
credential.

Partially fixes #2012

diff --git a/term-utils/agetty.c b/term-utils/agetty.c
index cf8725537b98a8e2824828b6c49d76bbaabb32e5..cc0f6e19048ba4632f2bb193dae3ffd66563b1ae 100644 (file)
--- a/term-utils/agetty.c
+++ b/term-utils/agetty.c
@@ -48,6 +48,7 @@
 #include "ttyutils.h"
 #include "color-names.h"
 #include "env.h"
+#include "path.h"
 
 #include "logindefs.h"
 
@@ -353,6 +354,7 @@ static void reload_agettys(void);
 static void print_issue_file(struct issue *ie, struct options *op, struct termios *tp);
 static void eval_issue_file(struct issue *ie, struct options *op, struct termios *tp);
 static void show_issue(struct options *op);
+static void load_credentials(struct options *op);
 
 
 /* Fake hostname for ut_host specified on command line. */
@@ -413,6 +415,9 @@ int main(int argc, char **argv)
        }
 #endif                         /* DEBUGGING */
 
+       /* Load systemd credentials. */
+       load_credentials(&options);
+
        /* Parse command-line arguments. */
        parse_args(argc, argv, &options);
 
@@ -575,7 +580,6 @@ int main(int argc, char **argv)
                log_warn(_("%s: can't change process priority: %m"),
                         options.tty);
 
-       free(options.osrelease);
 #ifdef DEBUGGING
        if (close_stream(dbf) != 0)
                log_err("write failed: %s", DEBUG_OUTPUT);
@@ -583,6 +587,10 @@ int main(int argc, char **argv)
 
        /* Let the login program take care of password validation. */
        execv(options.login, login_argv);
+
+       free(options.osrelease);
+       free(options.autolog);
+
        log_err(_("%s: can't exec %s: %m"), options.tty, login_argv[0]);
 }
 
@@ -779,7 +787,10 @@ static void parse_args(int argc, char **argv, struct options *op)
                        op->flags |= F_EIGHTBITS;
                        break;
                case 'a':
-                       op->autolog = optarg;
+                       free(op->autolog);
+                       op->autolog = strdup(optarg);
+                       if (!op->autolog)
+                               log_err(_("failed to allocate memory: %m"));
                        break;
                case 'c':
                        op->flags |= F_KEEPCFLAGS;
@@ -2021,7 +2032,7 @@ static void eval_issue_file(struct issue *ie,
        /* Fallback @sysconfstaticdir (usually /usr/lib) -- the file is not
         * required to read the dir
         */
-       issuefile_read(ie, _PATH_SYSCONFSTATICDIR "/" _PATH_ISSUE_FILENAME, op, tp); 
+       issuefile_read(ie, _PATH_SYSCONFSTATICDIR "/" _PATH_ISSUE_FILENAME, op, tp);
        issuedir_read(ie, _PATH_SYSCONFSTATICDIR "/" _PATH_ISSUE_DIRNAME, op, tp);
 
 done:
@@ -3020,3 +3031,36 @@ static void reload_agettys(void)
        errx(EXIT_FAILURE, _("--reload is unsupported on your system"));
 #endif
 }
+
+static void load_credentials(struct options *op) {
+       char *env;
+       DIR *dir;
+       struct dirent *d;
+       struct path_cxt *pc;
+
+       env = safe_getenv("CREDENTIALS_DIRECTORY");
+        if (!env)
+                return;
+
+       pc = ul_new_path("%s", env);
+       if (!pc) {
+               log_warn(_("failed to initialize path context"));
+               return;
+       }
+
+       dir = ul_path_opendir(pc, NULL);
+       if (!dir) {
+               log_warn(_("failed to open credentials directory"));
+               return;
+       }
+
+       while ((d = xreaddir(dir))) {
+               char *str;
+
+               if (strcmp(d->d_name, "agetty.autologin") == 0) {
+                       ul_path_read_string(pc, &str, d->d_name);
+                       free(op->autolog);
+                       op->autolog = str;
+               }
+       }
+}