-/* $Cambridge: exim/src/src/auths/plaintext.c,v 1.3 2006/02/07 11:19:01 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
#include "../exim.h"
/* Options specific to the plaintext authentication mechanism. */
optionlist auth_plaintext_options[] = {
+ { "client_ignore_invalid_base64", opt_bool,
+ (void *)(offsetof(auth_plaintext_options_block, client_ignore_invalid_base64)) },
{ "client_send", opt_stringptr,
(void *)(offsetof(auth_plaintext_options_block, client_send)) },
- { "server_condition", opt_stringptr,
- (void *)(offsetof(auth_plaintext_options_block, server_condition)) },
{ "server_prompts", opt_stringptr,
(void *)(offsetof(auth_plaintext_options_block, server_prompts)) }
};
/* Default private options block for the plaintext authentication method. */
auth_plaintext_options_block auth_plaintext_option_defaults = {
- NULL, /* server_condition */
NULL, /* server_prompts */
- NULL /* client_send */
+ NULL, /* client_send */
+ FALSE /* client_ignore_invalid_base64 */
};
+#ifdef MACRO_PREDEF
+
+/* Dummy values */
+void auth_plaintext_init(auth_instance *ablock) {}
+int auth_plaintext_server(auth_instance *ablock, uschar *data) {return 0;}
+int auth_plaintext_client(auth_instance *ablock, void * sx, int timeout,
+ uschar *buffer, int buffsize) {return 0;}
+
+#else /*!MACRO_PREDEF*/
+
+
+
/*************************************************
* Initialization entry point *
*************************************************/
auth_plaintext_options_block *ob =
(auth_plaintext_options_block *)(ablock->options_block);
if (ablock->public_name == NULL) ablock->public_name = ablock->name;
-if (ob->server_condition != NULL) ablock->server = TRUE;
+if (ablock->server_condition != NULL) ablock->server = TRUE;
if (ob->client_send != NULL) ablock->client = TRUE;
}
{
auth_plaintext_options_block *ob =
(auth_plaintext_options_block *)(ablock->options_block);
-uschar *prompts = ob->server_prompts;
-uschar *clear, *cond, *end, *s;
+const uschar *prompts = ob->server_prompts;
+uschar *clear, *end, *s;
int number = 1;
int len, rc;
int sep = 0;
if (prompts != NULL)
{
- prompts = expand_string(prompts);
+ prompts = expand_cstring(prompts);
if (prompts == NULL)
{
auth_defer_msg = expand_string_message;
}
/* If data was supplied on the AUTH command, decode it, and split it up into
-multiple items at binary zeros. If the data consists of the string "=" it
-indicates a single, empty string. */
+multiple items at binary zeros. The strings are put into $auth1, $auth2, etc,
+up to a maximum. To retain backwards compatibility, they are also put int $1,
+$2, etc. If the data consists of the string "=" it indicates a single, empty
+string. */
if (*data != 0)
{
if (Ustrcmp(data, "=") == 0)
{
- expand_nstring[++expand_nmax] = US"";
+ auth_vars[0] = expand_nstring[++expand_nmax] = US"";
expand_nlength[expand_nmax] = 0;
}
else
{
- if ((len = auth_b64decode(data, &clear)) < 0) return BAD64;
+ if ((len = b64decode(data, &clear)) < 0) return BAD64;
end = clear + len;
while (clear < end && expand_nmax < EXPAND_MAXN)
{
+ if (expand_nmax < AUTH_VARS) auth_vars[expand_nmax] = clear;
expand_nstring[++expand_nmax] = clear;
while (*clear != 0) clear++;
expand_nlength[expand_nmax] = clear++ - expand_nstring[expand_nmax];
{
if (number++ <= expand_nmax) continue;
if ((rc = auth_get_data(&data, s, Ustrlen(s))) != OK) return rc;
- if ((len = auth_b64decode(data, &clear)) < 0) return BAD64;
+ if ((len = b64decode(data, &clear)) < 0) return BAD64;
end = clear + len;
/* This loop must run at least once, in case the length is zero */
do
{
+ if (expand_nmax < AUTH_VARS) auth_vars[expand_nmax] = clear;
expand_nstring[++expand_nmax] = clear;
while (*clear != 0) clear++;
expand_nlength[expand_nmax] = clear++ - expand_nstring[expand_nmax];
while (clear < end && expand_nmax < EXPAND_MAXN);
}
-/* We now have a number of items of data in $1, $2, etc. Match against the
-decoded data by expanding the condition. Also expand the id to set if
-authentication succeeds. */
-
-cond = expand_string(ob->server_condition);
-
-HDEBUG(D_auth)
- {
- int i;
- debug_printf("%s authenticator:\n", ablock->name);
- for (i = 1; i <= expand_nmax; i++)
- debug_printf(" $%d = %.*s\n", i, expand_nlength[i], expand_nstring[i]);
- debug_print_string(ablock->server_debug_string); /* customized debug */
- if (cond == NULL)
- debug_printf("expansion failed: %s\n", expand_string_message);
- else
- debug_printf("expanded string: %s\n", cond);
- }
-
-/* A forced expansion failure causes authentication to fail. Other expansion
-failures yield DEFER, which will cause a temporary error code to be returned to
-the AUTH command. The problem is at the server end, so the client should try
-again later. */
-
-if (cond == NULL)
- {
- if (expand_string_forcedfail) return FAIL;
- auth_defer_msg = expand_string_message;
- return DEFER;
- }
-
-/* Return FAIL for empty string, "0", "no", and "false"; return OK for
-"1", "yes", and "true"; return DEFER for anything else, with the string
-available as an error text for the user. */
-
-if (*cond == 0 ||
- Ustrcmp(cond, "0") == 0 ||
- strcmpic(cond, US"no") == 0 ||
- strcmpic(cond, US"false") == 0)
- return FAIL;
+/* We now have a number of items of data in $auth1, $auth2, etc (and also, for
+compatibility, in $1, $2, etc). Authentication and authorization are handled
+together for this authenticator by expanding the server_condition option. Note
+that ablock->server_condition is always non-NULL because that's what configures
+this authenticator as a server. */
-if (Ustrcmp(cond, "1") == 0 ||
- strcmpic(cond, US"yes") == 0 ||
- strcmpic(cond, US"true") == 0)
- return OK;
-
-auth_defer_msg = cond;
-auth_defer_user_msg = string_sprintf(": %s", cond);
-return DEFER;
+return auth_check_serv_cond(ablock);
}
int
auth_plaintext_client(
auth_instance *ablock, /* authenticator block */
- smtp_inblock *inblock, /* connection inblock */
- smtp_outblock *outblock, /* connection outblock */
+ void * sx, /* smtp connextion */
int timeout, /* command timeout */
uschar *buffer, /* buffer for reading response */
int buffsize) /* size of buffer */
{
auth_plaintext_options_block *ob =
(auth_plaintext_options_block *)(ablock->options_block);
-uschar *text = ob->client_send;
+const uschar *text = ob->client_send;
uschar *s;
BOOL first = TRUE;
int sep = 0;
+int auth_var_idx = 0;
/* The text is broken up into a number of different data items, which are
sent one by one. The first one is sent with the AUTH command; the remainder are
sent in response to subsequent prompts. Each is expanded before being sent. */
-while ((s = string_nextinlist(&text, &sep, big_buffer, big_buffer_size)) != NULL)
+while ((s = string_nextinlist(&text, &sep, big_buffer, big_buffer_size)))
{
- int i, len;
+ int i, len, clear_len;
uschar *ss = expand_string(s);
+ uschar *clear;
/* Forced expansion failure is not an error; authentication is abandoned. On
all but the first string, we have to abandon the authentication attempt by
sending a line containing "*". Save the failed expansion string, because it
is in big_buffer, and that gets used by the sending function. */
- if (ss == NULL)
+ if (!ss)
{
uschar *ssave = string_copy(s);
if (!first)
{
- if (smtp_write_command(outblock, FALSE, "*\r\n") >= 0)
- (void) smtp_read_response(inblock, US buffer, buffsize, '2', timeout);
+ if (smtp_write_command(sx, SCMD_FLUSH, "*\r\n") >= 0)
+ (void) smtp_read_response(sx, US buffer, buffsize, '2', timeout);
+ }
+ if (f.expand_string_forcedfail)
+ {
+ *buffer = 0; /* No message */
+ return CANCELLED;
}
- if (expand_string_forcedfail) return CANCELLED;
string_format(buffer, buffsize, "expansion of \"%s\" failed in %s "
"authenticator: %s", ssave, ablock->name, expand_string_message);
return ERROR;
needed for the PLAIN mechanism. It must be doubled if really needed. */
for (i = 0; i < len; i++)
- {
if (ss[i] == '^')
- {
- if (ss[i+1] != '^') ss[i] = 0; else
+ if (ss[i+1] != '^')
+ ss[i] = 0;
+ else
{
i++;
len--;
memmove(ss + i, ss + i + 1, len - i);
}
- }
- }
/* The first string is attached to the AUTH command; others are sent
- unembelished. */
+ unembellished. */
if (first)
{
first = FALSE;
- if (smtp_write_command(outblock, FALSE, "AUTH %s%s%s\r\n",
- ablock->public_name, (len == 0)? "" : " ",
- auth_b64encode(ss, len)) < 0)
+ if (smtp_write_command(sx, SCMD_FLUSH, "AUTH %s%s%s\r\n",
+ ablock->public_name, len == 0 ? "" : " ", b64encode(ss, len)) < 0)
return FAIL_SEND;
}
else
{
- if (smtp_write_command(outblock, FALSE, "%s\r\n",
- auth_b64encode(ss, len)) < 0)
+ if (smtp_write_command(sx, SCMD_FLUSH, "%s\r\n", b64encode(ss, len)) < 0)
return FAIL_SEND;
}
has succeeded. There may be more data to send, but is there any point
in provoking an error here? */
- if (smtp_read_response(inblock, US buffer, buffsize, '2', timeout)) return OK;
+ if (smtp_read_response(sx, US buffer, buffsize, '2', timeout)) return OK;
/* Not a success response. If errno != 0 there is some kind of transmission
error. Otherwise, check the response code in the buffer. If it starts with
/* If there is no more data to send, we have to cancel the authentication
exchange and return ERROR. */
- if (text == NULL)
+ if (!text)
{
- if (smtp_write_command(outblock, FALSE, "*\r\n") >= 0)
- (void)smtp_read_response(inblock, US buffer, buffsize, '2', timeout);
+ if (smtp_write_command(sx, SCMD_FLUSH, "*\r\n") >= 0)
+ (void)smtp_read_response(sx, US buffer, buffsize, '2', timeout);
string_format(buffer, buffsize, "Too few items in client_send in %s "
"authenticator", ablock->name);
return ERROR;
}
+
+ /* Now that we know we'll continue, we put the received data into $auth<n>,
+ if possible. First, decode it: buffer+4 skips over the SMTP status code. */
+
+ clear_len = b64decode(buffer+4, &clear);
+
+ /* If decoding failed, the default is to terminate the authentication, and
+ return FAIL, with the SMTP response still in the buffer. However, if client_
+ ignore_invalid_base64 is set, we ignore the error, and put an empty string
+ into $auth<n>. */
+
+ if (clear_len < 0)
+ {
+ uschar *save_bad = string_copy(buffer);
+ if (!ob->client_ignore_invalid_base64)
+ {
+ if (smtp_write_command(sx, SCMD_FLUSH, "*\r\n") >= 0)
+ (void)smtp_read_response(sx, US buffer, buffsize, '2', timeout);
+ string_format(buffer, buffsize, "Invalid base64 string in server "
+ "response \"%s\"", save_bad);
+ return CANCELLED;
+ }
+ clear = US"";
+ clear_len = 0;
+ }
+
+ if (auth_var_idx < AUTH_VARS)
+ auth_vars[auth_var_idx++] = string_copy(clear);
}
/* Control should never actually get here. */
return FAIL;
}
+#endif /*!MACRO_PREDEF*/
/* End of plaintext.c */
git://git.exim.org / exim.git / blobdiff