Merge branch 'debian/experimental-2.5'

1 files changed, 459 insertions, 0 deletions

diff --git a/src/openvpn/env_set.c b/src/openvpn/env_set.c
new file mode 100644
index 0000000..0ab0262
--- /dev/null
+++ b/src/openvpn/env_set.c
@@ -0,0 +1,459 @@
+/*
+ *  OpenVPN -- An application to securely tunnel IP networks
+ *             over a single TCP/UDP port, with support for SSL/TLS-based
+ *             session authentication and key exchange,
+ *             packet encryption, packet authentication, and
+ *             packet compression.
+ *
+ *  Copyright (C) 2002-2017 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ *  Copyright (C) 2014-2015 David Sommerseth <davids@redhat.com>
+ *  Copyright (C) 2016-2017 David Sommerseth <davids@openvpn.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
+ *
+ *  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 (see the file COPYING included with this
+ *  distribution); if not, write to the Free Software Foundation, Inc.,
+ *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#elif defined(_MSC_VER)
+#include "config-msvc.h"
+#endif
+
+#include "syshead.h"
+
+#include "env_set.h"
+
+#include "run_command.h"
+
+/*
+ * Set environmental variable (int or string).
+ *
+ * On Posix, we use putenv for portability,
+ * and put up with its painful semantics
+ * that require all the support code below.
+ */
+
+/* General-purpose environmental variable set functions */
+
+static char *
+construct_name_value(const char *name, const char *value, struct gc_arena *gc)
+{
+    struct buffer out;
+
+    ASSERT(name);
+    if (!value)
+    {
+        value = "";
+    }
+    out = alloc_buf_gc(strlen(name) + strlen(value) + 2, gc);
+    buf_printf(&out, "%s=%s", name, value);
+    return BSTR(&out);
+}
+
+static bool
+env_string_equal(const char *s1, const char *s2)
+{
+    int c1, c2;
+    ASSERT(s1);
+    ASSERT(s2);
+
+    while (true)
+    {
+        c1 = *s1++;
+        c2 = *s2++;
+        if (c1 == '=')
+        {
+            c1 = 0;
+        }
+        if (c2 == '=')
+        {
+            c2 = 0;
+        }
+        if (!c1 && !c2)
+        {
+            return true;
+        }
+        if (c1 != c2)
+        {
+            break;
+        }
+    }
+    return false;
+}
+
+static bool
+remove_env_item(const char *str, const bool do_free, struct env_item **list)
+{
+    struct env_item *current, *prev;
+
+    ASSERT(str);
+    ASSERT(list);
+
+    for (current = *list, prev = NULL; current != NULL; current = current->next)
+    {
+        if (env_string_equal(current->string, str))
+        {
+            if (prev)
+            {
+                prev->next = current->next;
+            }
+            else
+            {
+                *list = current->next;
+            }
+            if (do_free)
+            {
+                secure_memzero(current->string, strlen(current->string));
+                free(current->string);
+                free(current);
+            }
+            return true;
+        }
+        prev = current;
+    }
+    return false;
+}
+
+static void
+add_env_item(char *str, const bool do_alloc, struct env_item **list, struct gc_arena *gc)
+{
+    struct env_item *item;
+
+    ASSERT(str);
+    ASSERT(list);
+
+    ALLOC_OBJ_GC(item, struct env_item, gc);
+    item->string = do_alloc ? string_alloc(str, gc) : str;
+    item->next = *list;
+    *list = item;
+}
+
+/* struct env_set functions */
+
+static bool
+env_set_del_nolock(struct env_set *es, const char *str)
+{
+    return remove_env_item(str, es->gc == NULL, &es->list);
+}
+
+static void
+env_set_add_nolock(struct env_set *es, const char *str)
+{
+    remove_env_item(str, es->gc == NULL, &es->list);
+    add_env_item((char *)str, true, &es->list, es->gc);
+}
+
+struct env_set *
+env_set_create(struct gc_arena *gc)
+{
+    struct env_set *es;
+    ALLOC_OBJ_CLEAR_GC(es, struct env_set, gc);
+    es->list = NULL;
+    es->gc = gc;
+    return es;
+}
+
+void
+env_set_destroy(struct env_set *es)
+{
+    if (es && es->gc == NULL)
+    {
+        struct env_item *e = es->list;
+        while (e)
+        {
+            struct env_item *next = e->next;
+            free(e->string);
+            free(e);
+            e = next;
+        }
+        free(es);
+    }
+}
+
+bool
+env_set_del(struct env_set *es, const char *str)
+{
+    bool ret;
+    ASSERT(es);
+    ASSERT(str);
+    ret = env_set_del_nolock(es, str);
+    return ret;
+}
+
+void
+env_set_add(struct env_set *es, const char *str)
+{
+    ASSERT(es);
+    ASSERT(str);
+    env_set_add_nolock(es, str);
+}
+
+const char *
+env_set_get(const struct env_set *es, const char *name)
+{
+    const struct env_item *item = es->list;
+    while (item && !env_string_equal(item->string, name))
+    {
+        item = item->next;
+    }
+    return item ? item->string : NULL;
+}
+
+void
+env_set_print(int msglevel, const struct env_set *es)
+{
+    if (check_debug_level(msglevel))
+    {
+        const struct env_item *e;
+        int i;
+
+        if (es)
+        {
+            e = es->list;
+            i = 0;
+
+            while (e)
+            {
+                if (env_safe_to_print(e->string))
+                {
+                    msg(msglevel, "ENV [%d] '%s'", i, e->string);
+                }
+                ++i;
+                e = e->next;
+            }
+        }
+    }
+}
+
+void
+env_set_inherit(struct env_set *es, const struct env_set *src)
+{
+    const struct env_item *e;
+
+    ASSERT(es);
+
+    if (src)
+    {
+        e = src->list;
+        while (e)
+        {
+            env_set_add_nolock(es, e->string);
+            e = e->next;
+        }
+    }
+}
+
+
+/* add/modify/delete environmental strings */
+
+void
+setenv_counter(struct env_set *es, const char *name, counter_type value)
+{
+    char buf[64];
+    openvpn_snprintf(buf, sizeof(buf), counter_format, value);
+    setenv_str(es, name, buf);
+}
+
+void
+setenv_int(struct env_set *es, const char *name, int value)
+{
+    char buf[64];
+    openvpn_snprintf(buf, sizeof(buf), "%d", value);
+    setenv_str(es, name, buf);
+}
+
+void
+setenv_long_long(struct env_set *es, const char *name, long long value)
+{
+    char buf[64];
+    openvpn_snprintf(buf, sizeof(buf), "%" PRIi64, (int64_t)value);
+    setenv_str(es, name, buf);
+}
+
+void
+setenv_str(struct env_set *es, const char *name, const char *value)
+{
+    setenv_str_ex(es, name, value, CC_NAME, 0, 0, CC_PRINT, 0, 0);
+}
+
+void
+setenv_str_safe(struct env_set *es, const char *name, const char *value)
+{
+    uint8_t b[64];
+    struct buffer buf;
+    buf_set_write(&buf, b, sizeof(b));
+    if (buf_printf(&buf, "OPENVPN_%s", name))
+    {
+        setenv_str(es, BSTR(&buf), value);
+    }
+    else
+    {
+        msg(M_WARN, "setenv_str_safe: name overflow");
+    }
+}
+
+void
+setenv_str_incr(struct env_set *es, const char *name, const char *value)
+{
+    unsigned int counter = 1;
+    const size_t tmpname_len = strlen(name) + 5; /* 3 digits counter max */
+    char *tmpname = gc_malloc(tmpname_len, true, NULL);
+    strcpy(tmpname, name);
+    while (NULL != env_set_get(es, tmpname) && counter < 1000)
+    {
+        ASSERT(openvpn_snprintf(tmpname, tmpname_len, "%s_%u", name, counter));
+        counter++;
+    }
+    if (counter < 1000)
+    {
+        setenv_str(es, tmpname, value);
+    }
+    else
+    {
+        msg(D_TLS_DEBUG_MED, "Too many same-name env variables, ignoring: %s", name);
+    }
+    free(tmpname);
+}
+
+void
+setenv_del(struct env_set *es, const char *name)
+{
+    ASSERT(name);
+    setenv_str(es, name, NULL);
+}
+
+void
+setenv_str_ex(struct env_set *es,
+              const char *name,
+              const char *value,
+              const unsigned int name_include,
+              const unsigned int name_exclude,
+              const char name_replace,
+              const unsigned int value_include,
+              const unsigned int value_exclude,
+              const char value_replace)
+{
+    struct gc_arena gc = gc_new();
+    const char *name_tmp;
+    const char *val_tmp = NULL;
+
+    ASSERT(name && strlen(name) > 1);
+
+    name_tmp = string_mod_const(name, name_include, name_exclude, name_replace, &gc);
+
+    if (value)
+    {
+        val_tmp = string_mod_const(value, value_include, value_exclude, value_replace, &gc);
+    }
+
+    ASSERT(es);
+
+    if (val_tmp)
+    {
+        const char *str = construct_name_value(name_tmp, val_tmp, &gc);
+        env_set_add(es, str);
+#if DEBUG_VERBOSE_SETENV
+        msg(M_INFO, "SETENV_ES '%s'", str);
+#endif
+    }
+    else
+    {
+        env_set_del(es, name_tmp);
+    }
+
+    gc_free(&gc);
+}
+
+/*
+ * Setenv functions that append an integer index to the name
+ */
+static const char *
+setenv_format_indexed_name(const char *name, const int i, struct gc_arena *gc)
+{
+    struct buffer out = alloc_buf_gc(strlen(name) + 16, gc);
+    if (i >= 0)
+    {
+        buf_printf(&out, "%s_%d", name, i);
+    }
+    else
+    {
+        buf_printf(&out, "%s", name);
+    }
+    return BSTR(&out);
+}
+
+void
+setenv_int_i(struct env_set *es, const char *name, const int value, const int i)
+{
+    struct gc_arena gc = gc_new();
+    const char *name_str = setenv_format_indexed_name(name, i, &gc);
+    setenv_int(es, name_str, value);
+    gc_free(&gc);
+}
+
+void
+setenv_str_i(struct env_set *es, const char *name, const char *value, const int i)
+{
+    struct gc_arena gc = gc_new();
+    const char *name_str = setenv_format_indexed_name(name, i, &gc);
+    setenv_str(es, name_str, value);
+    gc_free(&gc);
+}
+
+bool
+env_allowed(const char *str)
+{
+    return (script_security() >= SSEC_PW_ENV || !is_password_env_var(str));
+}
+
+/* Make arrays of strings */
+
+const char **
+make_env_array(const struct env_set *es,
+               const bool check_allowed,
+               struct gc_arena *gc)
+{
+    char **ret = NULL;
+    struct env_item *e = NULL;
+    int i = 0, n = 0;
+
+    /* figure length of es */
+    if (es)
+    {
+        for (e = es->list; e != NULL; e = e->next)
+        {
+            ++n;
+        }
+    }
+
+    /* alloc return array */
+    ALLOC_ARRAY_CLEAR_GC(ret, char *, n+1, gc);
+
+    /* fill return array */
+    if (es)
+    {
+        i = 0;
+        for (e = es->list; e != NULL; e = e->next)
+        {
+            if (!check_allowed || env_allowed(e->string))
+            {
+                ASSERT(i < n);
+                ret[i++] = e->string;
+            }
+        }
+    }
+
+    ret[i] = NULL;
+    return (const char **)ret;
+}