This file is indexed.

/usr/share/sendmail/update_auth is in sendmail-base 8.14.4-8+deb8u2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
#!/bin/sh -e
#-----------------------------------------------------------------------------
#
# $Sendmail: update_auth,v 8.14.4 2017-02-05 23:17:28 cowboy Exp $
#
# Sendmail support for SMTP AUTH (SASL)
#
# Copyright (c) 2000-2010 Richard Nelson.  All Rights Reserved.
#
# Notes:
#
#-----------------------------------------------------------------------------
set -e;

NEW=0;
DEFAULT=0;
HOSTNAME=`hostname -s`;
HOSTFQDN=`hostname -f`;
DOMAINNAME=`hostname -d`;
SMUID=sendmail;
SMAID=sendmail;
SMPWD=sendmailpwd;
SMRLM="$HOSTNAME.$DOMAINNAME";
SMMCH='';

# Path to other sendmail helpers
if [ -x ./update_sendmail ]; then
	sm_path='.';
elif [ -x $(dirname $0)/update_sendmail ]; then
	sm_path=$(dirname $0);
else
	sm_path=/usr/share/sendmail;
	fi;
# Bring in sendmail.conf for the network definitions
if [ ! -f /etc/mail/sendmail.conf ]; then
	if [ -x $sm_path/update_conf ]; then
		$sm_path/update_conf;
		fi;
	fi; 
if [ -f /etc/mail/sendmail.conf ]; then
	. /etc/mail/sendmail.conf;
	fi;
if [ "$HANDS_OFF" != 'No' ]; then
	exit 0;
	fi;

# See what sendmail was linked with
if [ "yes" != "yes" ]; then
	echo "SASL support not included in sendmail, skipping...";
	exit 0;
elif [ 2 -eq 2 ]; then
	SASLDBLISTUSERS='/usr/sbin/sasldblistusers2';
	SASLPASSWD='/usr/sbin/saslpasswd2';
	SASLLIB='/usr/lib/sasl2';
	SASLSO='2';
	SASLDB='/etc/sasldb2';
	SASL_BIN='sasl2-bin';
	SASL_LIB='libsasl2';
	SASL='SASL2';
elif [ 2 -eq 1 ]; then
	SASLDBLISTUSERS='/usr/sbin/sasldblistusers';
	SASLPASSWD='/usr/sbin/saslpasswd';
	SASLLIB='/usr/lib/sasl';
	SASLSO='1';
	SASLDB='/etc/sasldb';
	SASL_BIN='sasl-bin';
	SASL_LIB='libsasl';
	SASL='SASL';
	fi;	

# Check if SASL is installed
if [ ! -d ${SASLLIB} ]; then
	cat <<-EOT

		${SASL} not installed, not configuring sendmail support.

		EOT
	if [ "${SASLSO}" = '1' ]; then
		cat <<-EOT
		To install ${SASL}, get ${SASL_BIN}, ${SASL_LIB}-modules-plain,
		${SASL_LIB}-digestmd5-plain or ${SASL_LIB}-digestmd5-des.
		EOT
	else
		cat <<-EOT
		To install ${SASL}, get ${SASL_BIN} and ${SASL_LIB}-modules.
		EOT
		fi;
	cat <<-EOT

		To enable sendmail ${SASL} support at a later date, invoke "$0"

		EOT
	exit 0;
	fi;

# Check for sasl-bin (wherein resides saslpasswd)
if [ ! -x ${SASLPASSWD} ]; then
	cat <<-EOT
		${SASL_BIN} not installed, not configuring sendmail support.

		To enable sendmail ${SASL} support at a later date, invoke "$0"

		EOT
	exit 0;
	fi;
#echo " ";
#echo "Creating/Updating ${SASL} information";
touch /etc/mail/tsasl;
if chown root:sasl /etc/mail/tsasl 2>/dev/null; then
	adduser smmta sasl 1>/dev/null 2>&1;
	adduser smmsp sasl 1>/dev/null 2>&1;
	fi;
	rm /etc/mail/tsasl;

# See if we need to rename an existing SASL info file
if [ -f /etc/mail/auth-info ] \
&&	[ ! -f /etc/mail/default-auth-info ]; then
	mv /etc/mail/auth-info \
		/etc/mail/default-auth-info;
	fi;

# Use exisisting SASL auth information
if [ -f /etc/mail/default-auth-info ]; then
	SMUID=$(head -n1 /etc/mail/default-auth-info);
	SMAID=$(head -n2 /etc/mail/default-auth-info | tail -n1 -);
	SMPWD=$(head -n3 /etc/mail/default-auth-info | tail -n1 -);
	SMRLM=$(head -n4 /etc/mail/default-auth-info | tail -n1 -);
	SMMCH=$(head -n5 /etc/mail/default-auth-info | tail -n1 -);
	fi;

# Check for default settings, used in later test
if [ "$SMUID" = 'sendmail' ] \
&& [ "$SMAID" = 'sendmail' ] \
&& [ "$SMPWD" = 'sendmailpwd' ]; then
	DEFAULT=1;
	fi;

# Create Default SASL auth information
if [ ! -f /etc/mail/default-auth-info ]; then
	cat <<-EOT > /etc/mail/default-auth-info
	$SMUID
	$SMAID
	$SMPWD
	$SMRLM
	$SMMCH
	EOT
	fi;

# Create any missing SASL configuration files
if [ -d ${SASLLIB} ]; then
	# SASL password configuration
	if [ ! -f ${SASLLIB}/saslpasswd.conf ]; then
		NEW=1;
		cp /usr/share/sendmail/examples/sasl/saslpasswd.conf.${SASLSO} \
			${SASLLIB}/saslpasswd.conf;
		fi;
	chown root:root ${SASLLIB}/saslpasswd.conf;
	chmod 0640 ${SASLLIB}/saslpasswd.conf;

	# Sendmail SASL configuration
	if [ -L ${SASLLIB}/Sendmail.conf ]; then
		ln -sf /etc/mail/sasl/Sendmail.conf.${SASLSO} \
			${SASLLIB}/Sendmail.conf;
	else
		if [ -f ${SASLLIB}/Sendmail.conf ]; then
			mv ${SASLLIB}/Sendmail.conf \
				/etc/mail/sasl/Sendmail.conf.${SASLSO};
			fi;
		ln -sf /etc/mail/sasl/Sendmail.conf.${SASLSO} \
			${SASLLIB}/Sendmail.conf;
		fi;

	# Make sure libraries are properly installed...
	( cd ${SASLLIB} && \
	if [ -L libanonymous.so.${SASLSO} ] && [ ! -L libanonymous.so ]; then \
		ln -s libanonymous.so.${SASLSO} libanonymous.so; \
		fi; \
	if [ -L libcrammd5.so.${SASLSO} ] && [ ! -L libcrammd5.so ]; then \
		ln -s libcrammd5.so.${SASLSO} libcrammd5.so; \
		fi; \
	if [ -L libdigestmd5.so.${SASLSO} ] && [ ! -L libdigestmd5.so ]; then \
		ln -s libdigestmd5.so.${SASLSO} libdigestmd5.so; \
		fi; \
	if [ -L libdigestmd5.so.0 ] && [ ! -L libdigestmd5.so ]; then \
		ln -s libdigestmd5.so.0 libdigestmd5.so; \
		fi; \
	if [ -L libgssapiv2.so.${SASLSO} ] && [ ! -L libgssapiv2.so ]; then \
		ln -s libgssapiv2.so.${SASLSO} libgssapiv2.so; \
		fi; \
	if [ -L liblogin.so.${SASLSO} ] && [ ! -L liblogin.so ]; then \
		ln -s liblogin.so.${SASLSO} liblogin.so; \
		fi; \
	if [ -L liblogin.so.0 ] && [ ! -L liblogin.so ]; then \
		ln -s liblogin.so.0 liblogin.so; \
		fi; \
	if [ -L libplain.so.${SASLSO} ] && [ ! -L libplain.so ]; then \
		ln -s libplain.so.${SASLSO} libplain.so; \
		fi; )
	fi;

# Create/update sendmail SASL files
chown smmta:smmsp /etc/mail/sasl;
chmod 0755 /etc/mail/sasl;
if [ ! -f /etc/mail/sasl/Sendmail.conf.${SASLSO} ] \
&& [ -f /etc/mail/sasl/Sendmail.conf ]; then
		mv /etc/mail/sasl/Sendmail.conf \
			/etc/mail/sasl/Sendmail.conf.${SASLSO};
	fi;
if [ ! -f /etc/mail/sasl/Sendmail.conf.${SASLSO} ]; then
	NEW=1;
	cp /usr/share/sendmail/examples/sasl/Sendmail.conf.${SASLSO} \
		/etc/mail/sasl/;
	fi;
chown smmta:smmsp /etc/mail/sasl/Sendmail.conf.${SASLSO};
chmod 0640 /etc/mail/sasl/Sendmail.conf.${SASLSO};

#---------------------------------------------------------------------------
# Make sure prototype /etc/mail/sasl/sasl.m4 exists
$sm_path/update_authm4 || true;

# Recommend PAM for sendmail authorization
if [ "${SASLSO}" = "2" ]; then
	if grep -qEe '^[[:space:]]*auto_transition:[[:space:]]*false' \
		/etc/mail/sasl/Sendmail.conf.${SASLSO}; then
		sed -e \
			's?^[[:space:]]*auto_transition:.*$?auto_transition: true?' \
			/etc/mail/sasl/Sendmail.conf.${SASLSO} \
			> /etc/mail/sasl/Sendmail.conf.new;
		fi;
	if [ -f /etc/mail/sasl/Sendmail.conf.new ]; then
		chown smmta:smmsp /etc/mail/sasl/Sendmail.conf.new;
		chmod 0644 /etc/mail/sasl/Sendmail.conf.new;
		mv /etc/mail/sasl/Sendmail.conf.new \
		/etc/mail/sasl/Sendmail.conf.${SASLSO};
		fi;

	cat <<-EOT
	
	Ah, you're setup with SASL${SASLSO} !

	Unfortunately, there is no automagic way to migrate to ${SASLDB} :(

	You'll want to make sure /etc/default/saslauthd is setup to start,
	and has at least MECHANISMS="pam" !

	If you find out what more is needed, please let me know!
	EOT
else 
	if ! grep -qEe "^[[:space:]]*pwcheck_method:[[:space:]]*PAM" \
		${SASLLIB}/Sendmail.conf; then
		cat <<-EOT

		It is *strongly* recommended that you use PAM as the authentication
		method for sendmail via ${SASL}.  Doing so will allow *all* your shell
		users (those with an /etc/passwd entry) to automagically authenticate
		themselves when using a MUA with ${SASL} support turned on.

		Do you wish to use PAM (Y|n)?
		EOT
		read yn;
		yn=$(echo -n "$yn" | sed -e "s/^\ *//" -e "s/^\t*//");
		test -n "$yn" || yn="Y";
		case "$yn" in
			[Yy]*)
				if grep -qEe '^[[:space:]]*pwcheck_method:' \
					/etc/mail/sasl/Sendmail.conf.${SASLSO}; then
					sed -e \
					's?^[[:space:]]*pwcheck_method:.*$?pwcheck_method: PAM?' \
					/etc/mail/sasl/Sendmail.conf.${SASLSO} \
					> /etc/mail/sasl/Sendmail.conf.new;
				else
					echo 'pwcheck_method: PAM' \
						| cat /etc/mail/sasl/Sendmail.conf.${SASLSO} - \
						> /etc/mail/sasl/Sendmail.conf.new;
					fi;
				if [ -f /etc/mail/sasl/Sendmail.conf.new ]; then
					chown smmta:smmsp /etc/mail/sasl/Sendmail.conf.new;
					chmod 0640 /etc/mail/sasl/Sendmail.conf.new;
					mv /etc/mail/sasl/Sendmail.conf.new \
						/etc/mail/sasl/Sendmail.conf.${SASLSO};
					fi;
				;;
			esac;
		fi;
	fi;

# Make sure default-auth-info is secure
if [ -f /etc/mail/default-auth-info ]; then
	chown smmta:smmsp /etc/mail/default-auth-info;
	chmod 0640 /etc/mail/default-auth-info;
	fi;

# Create skeleton file, the saslpasswd command will get a failure ;-{
if [ ! -f ${SASLDB} ]; then
	NEW=1;
	if [ -x ${SASLPASSWD} ]; then
		${SASLDBLISTUSERS} 1>/dev/null 2>&1 || true;
		echo "$SMPWD" | ${SASLPASSWD} -p -c -u $SMRLM $SMAID \
			1>/dev/null 2>&1 || true;
		chown root:sasl ${SASLDB};
		chmod 0660 ${SASLDB};
	else
		echo "*** You do not have the ${SASL_BIN} package installed!";
		echo "*** Please install it and rerun $0";
		echo "*** Sendmail can't use ${SASL} until this is done...";
		fi;
	fi;

# Set SMTP auth password
if [ -x ${SASLPASSWD} ]; then
	if [ $DEFAULT = 0 ]; then
		echo "$SMPWD" | ${SASLPASSWD} -p -c -u $SMRLM $SMAID || true;
	else
		${SASLPASSWD} -d -u $SMRLM $SMAID 1>/dev/null 2>&1 || true;
		fi;
	fi;

# For sendmail, /etc/sasldb must be 0600 or (0640/0660 w/dontblamesendmail)
if [ -f ${SASLDB} ]; then
	find ${SASLDB} -gid 0 -print | xargs -r chown root:sasl;
	find ${SASLDB} -gid 8 -print | xargs -r chown root:sasl;
	find ${SASLDB} -group smmsp -print | xargs -r chown root:sasl;
	chmod g-x,o-rwx ${SASLDB};
	fi;

# Tell them about the new wizbang features...
if [ $NEW -eq 1 ]; then
	cat <<-EOT

	To enable sendmail to use SASLS, you need to:
		1) Add this line to /etc/mail/sendmail.mc and optionally
		   to /etc/mail/submit.mc:
			  include(\`/etc/mail/sasl/sasl.m4')dnl
		2) Run sendmailconfig
		3) Restart sendmail

	${SASL} is now minimally setup, there are a few ways to handle users:
	   *) Allow only shell users (default)
		  You're all set, nothing else to do !
	   *) Allow users other than shell
		  Add users via ${SASLPASSWD} and make sure that the
		  realm you used matches what your users specify in their
		  netscape/outlook/mutt/etc profiles.

	If you need to authorize sendmail as a sender, also update
	/etc/mail/default-auth-info and rerun $0.

	EOT
	fi;