Baseline firejail 0.9.28

1 files changed, 96 insertions, 0 deletions

diff --git a/src/firejail/restricted_shell.c b/src/firejail/restricted_shell.c
new file mode 100644
index 000000000..ba3aae759
--- /dev/null
+++ b/src/firejail/restricted_shell.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2014, 2015 netblue30 (netblue30@yahoo.com)
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+#include "firejail.h"
+
+#define MAX_READ 4096   // maximum line length
+char *restricted_user = NULL;
+
+
+int restricted_shell(const char *user) {
+        assert(user);
+
+        // open profile file:
+        FILE *fp = fopen("/etc/firejail/login.users", "r");
+        if (fp == NULL)
+                return 0;
+
+        int lineno = 0;
+        char buf[MAX_READ];
+        while (fgets(buf, MAX_READ, fp)) {
+                lineno++;
+                
+                // remove empty spaces at the beginning of the line
+                char *ptr = buf;
+                while (*ptr == ' ' || *ptr == '\t') { 
+                        ptr++;
+                }
+                if (*ptr == '\n' || *ptr == '#')
+                        continue;
+                
+                // parse line   
+                char *usr = ptr;
+                char *args = strchr(usr, ':');
+                if (args == NULL) {
+                        fprintf(stderr, "Error: users.conf line %d\n", lineno);
+                        exit(1);
+                }
+                *args = '\0';
+                args++;
+                ptr = strchr(args, '\n');
+                if (ptr)
+                        *ptr = '\0';
+                        
+                if (strcmp(user, usr) == 0) {
+                        restricted_user = strdup(user);
+                        // extract program arguments
+
+                        fullargv[0] = "firejail";
+                        int i;
+                        ptr = args;
+                        for (i = 1; i < MAX_ARGS; i++) {
+                                fullargv[i] = ptr;
+                                while (*ptr != ' ' && *ptr != '\t' && *ptr != '\0')
+                                        ptr++;
+                                if (*ptr != '\0') {
+                                        *ptr ='\0';
+                                        fullargv[i] = strdup(fullargv[i]);
+                                        if (fullargv[i] == NULL) {
+                                                fprintf(stderr, "Error: cannot allocate memory\n");
+                                                exit(1);
+                                        }
+                                        ptr++;
+                                        while (*ptr == ' ' || *ptr == '\t')
+                                                ptr++;
+                                        if (*ptr != '\0')
+                                                continue;
+                                }
+                                fullargv[i] = strdup(fullargv[i]);
+                                fclose(fp);
+                                return i + 1;
+                        }
+                        fprintf(stderr, "Error: too many program arguments in users.conf line %d\n", lineno);
+                        exit(1);
+                }
+        }
+        fclose(fp);
+                         
+        return 0;   
+}
+