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-rw-r--r--libmisc/setupenv.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/libmisc/setupenv.c b/libmisc/setupenv.c
new file mode 100644
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--- /dev/null
+++ b/libmisc/setupenv.c
@@ -0,0 +1,290 @@
+/*
+ * SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
+ * SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2001 - 2006, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * Separated from setup.c. --marekm
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <ctype.h>
+#include "prototypes.h"
+#include "defines.h"
+#include <pwd.h>
+#include "getdef.h"
+#include "shadowlog.h"
+
+#ifndef USE_PAM
+static void
+addenv_path (const char *varname, const char *dirname, const char *filename)
+{
+ char *buf;
+ size_t len = strlen (dirname) + strlen (filename) + 2;
+ int wlen;
+
+ buf = xmalloc (len);
+ wlen = snprintf (buf, len, "%s/%s", dirname, filename);
+ assert (wlen == (int) len - 1);
+
+ addenv (varname, buf);
+ free (buf);
+}
+
+static void read_env_file (const char *filename)
+{
+ FILE *fp;
+ char buf[1024];
+ char *cp, *name, *val;
+
+ fp = fopen (filename, "r");
+ if (NULL == fp) {
+ return;
+ }
+ while (fgets (buf, (int)(sizeof buf), fp) == buf) {
+ cp = strrchr (buf, '\n');
+ if (NULL == cp) {
+ break;
+ }
+ *cp = '\0';
+
+ cp = buf;
+ /* ignore whitespace and comments */
+ while (('\0' != *cp) && isspace (*cp)) {
+ cp++;
+ }
+ if (('\0' == *cp) || ('#' == *cp)) {
+ continue;
+ }
+ /*
+ * ignore lines which don't follow the name=value format
+ * (for example, the "export NAME" shell commands)
+ */
+ name = cp;
+ while (('\0' != *cp) && !isspace (*cp) && ('=' != *cp)) {
+ cp++;
+ }
+ if ('=' != *cp) {
+ continue;
+ }
+ /* NUL-terminate the name */
+ *cp = '\0';
+ cp++;
+ val = cp;
+#if 0 /* XXX untested, and needs rewrite with fewer goto's :-) */
+/*
+ (state, char_type) -> (state, action)
+
+ state: unquoted, single_quoted, double_quoted, escaped, double_quoted_escaped
+ char_type: normal, white, backslash, single, double
+ action: remove_curr, remove_curr_skip_next, remove_prev, finish XXX
+*/
+ no_quote:
+ if (*cp == '\\') {
+ /* remove the backslash */
+ remove_char (cp);
+ /* skip over the next character */
+ if (*cp)
+ cp++;
+ goto no_quote;
+ } else if (*cp == '\'') {
+ /* remove the quote */
+ remove_char (cp);
+ /* now within single quotes */
+ goto s_quote;
+ } else if (*cp == '"') {
+ /* remove the quote */
+ remove_char (cp);
+ /* now within double quotes */
+ goto d_quote;
+ } else if (*cp == '\0') {
+ /* end of string */
+ goto finished;
+ } else if (isspace (*cp)) {
+ /* unescaped whitespace - end of string */
+ *cp = '\0';
+ goto finished;
+ } else {
+ cp++;
+ goto no_quote;
+ }
+ s_quote:
+ if (*cp == '\'') {
+ /* remove the quote */
+ remove_char (cp);
+ /* unquoted again */
+ goto no_quote;
+ } else if (*cp == '\0') {
+ /* end of string */
+ goto finished;
+ } else {
+ /* preserve everything within single quotes */
+ cp++;
+ goto s_quote;
+ }
+ d_quote:
+ if (*cp == '\"') {
+ /* remove the quote */
+ remove_char (cp);
+ /* unquoted again */
+ goto no_quote;
+ } else if (*cp == '\\') {
+ cp++;
+ /* if backslash followed by double quote, remove backslash
+ else skip over the backslash and following char */
+ if (*cp == '"')
+ remove_char (cp - 1);
+ else if (*cp)
+ cp++;
+ goto d_quote;
+ }
+ else if (*cp == '\0') {
+ /* end of string */
+ goto finished;
+ } else {
+ /* preserve everything within double quotes */
+ goto d_quote;
+ }
+ finished:
+#endif /* 0 */
+ /*
+ * XXX - should handle quotes, backslash escapes, etc.
+ * like the shell does.
+ */
+ addenv (name, val);
+ }
+ (void) fclose (fp);
+}
+#endif /* USE_PAM */
+
+
+/*
+ * change to the user's home directory
+ * set the HOME, SHELL, MAIL, PATH, and LOGNAME or USER environmental
+ * variables.
+ */
+
+void setup_env (struct passwd *info)
+{
+#ifndef USE_PAM
+ const char *envf;
+#endif
+ const char *cp;
+
+ /*
+ * Change the current working directory to be the home directory
+ * of the user. It is a fatal error for this process to be unable
+ * to change to that directory. There is no "default" home
+ * directory.
+ *
+ * We no longer do it as root - should work better on NFS-mounted
+ * home directories. Some systems default to HOME=/, so we make
+ * this a configurable option. --marekm
+ */
+
+ if (chdir (info->pw_dir) == -1) {
+ static char temp_pw_dir[] = "/";
+
+ if (!getdef_bool ("DEFAULT_HOME") || chdir ("/") == -1) {
+ fprintf (log_get_logfd(), _("Unable to cd to '%s'\n"),
+ info->pw_dir);
+ SYSLOG ((LOG_WARN,
+ "unable to cd to `%s' for user `%s'\n",
+ info->pw_dir, info->pw_name));
+ closelog ();
+ exit (EXIT_FAILURE);
+ }
+ (void) puts (_("No directory, logging in with HOME=/"));
+ free (info->pw_dir);
+ info->pw_dir = xstrdup (temp_pw_dir);
+ }
+
+ /*
+ * Create the HOME environmental variable and export it.
+ */
+
+ addenv ("HOME", info->pw_dir);
+
+ /*
+ * Create the SHELL environmental variable and export it.
+ */
+
+ if ((NULL == info->pw_shell) || ('\0' == *info->pw_shell)) {
+ static char temp_pw_shell[] = SHELL;
+
+ free (info->pw_shell);
+ info->pw_shell = xstrdup (temp_pw_shell);
+ }
+
+ addenv ("SHELL", info->pw_shell);
+
+ /*
+ * Export the user name. For BSD derived systems, it's "USER", for
+ * all others it's "LOGNAME". We set both of them.
+ */
+
+ addenv ("USER", info->pw_name);
+ addenv ("LOGNAME", info->pw_name);
+
+ /*
+ * Create the PATH environmental variable and export it.
+ */
+
+ cp = getdef_str ((info->pw_uid == 0) ? "ENV_SUPATH" : "ENV_PATH");
+
+ if (NULL == cp) {
+ /* not specified, use a minimal default */
+ addenv ((info->pw_uid == 0) ? "PATH=/sbin:/bin:/usr/sbin:/usr/bin" : "PATH=/bin:/usr/bin", NULL);
+ } else if (strchr (cp, '=')) {
+ /* specified as name=value (PATH=...) */
+ addenv (cp, NULL);
+ } else {
+ /* only value specified without "PATH=" */
+ addenv ("PATH", cp);
+ }
+
+#ifndef USE_PAM
+ /*
+ * Create the MAIL environmental variable and export it. login.defs
+ * knows the prefix.
+ */
+
+ if (getdef_bool ("MAIL_CHECK_ENAB")) {
+ cp = getdef_str ("MAIL_DIR");
+ if (NULL != cp) {
+ addenv_path ("MAIL", cp, info->pw_name);
+ } else {
+ cp = getdef_str ("MAIL_FILE");
+ if (NULL != cp) {
+ addenv_path ("MAIL", info->pw_dir, cp);
+ } else {
+#if defined(MAIL_SPOOL_FILE)
+ addenv_path ("MAIL", info->pw_dir, MAIL_SPOOL_FILE);
+#elif defined(MAIL_SPOOL_DIR)
+ addenv_path ("MAIL", MAIL_SPOOL_DIR, info->pw_name);
+#endif
+ }
+ }
+ }
+
+ /*
+ * Read environment from optional config file. --marekm
+ */
+ envf = getdef_str ("ENVIRON_FILE");
+ if (NULL != envf) {
+ read_env_file (envf);
+ }
+#endif /* !USE_PAM */
+}
+
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