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diff --git a/contrib/slapd-modules/ppm/slapm-ppm.5 b/contrib/slapd-modules/ppm/slapm-ppm.5 new file mode 100644 index 0000000..10e9c8d --- /dev/null +++ b/contrib/slapd-modules/ppm/slapm-ppm.5 @@ -0,0 +1,360 @@ +.\" Automatically generated by Pandoc 2.9.2.1 +.\" +.TH "ppm" "5" "August 24, 2021" "ppm" "File Formats Manual" +.hy +.SH NAME +.PP +ppm (Password Policy Module) - extension of the password policy overlay +.SH SYNOPSIS +.PP +ETCDIR/ppm.example +.SH DESCRIPTION +.PP +\f[B]ppm\f[R] is an OpenLDAP module for checking password quality when +they are modified. +Passwords are checked against the presence or absence of certain +character classes. +.PP +This module is used as an extension of the OpenLDAP password policy +controls, see slapo-ppolicy(5) section \f[B]pwdCheckModule\f[R]. +.SH USAGE +.PP +Create a password policy entry and indicate the path of the ppm.so +library and the content of the desired policy. +Use a base64 tool to code / decode the content of the policy stored into +\f[B]pwdCheckModuleArg\f[R]. +Here is an example: +.IP +.nf +\f[C] +dn: cn=default,ou=policies,dc=my-domain,dc=com +objectClass: pwdPolicy +objectClass: top +objectClass: pwdPolicyChecker +objectClass: person +pwdCheckQuality: 2 +pwdAttribute: userPassword +sn: default +cn: default +pwdMinLength: 6 +pwdCheckModule: /usr/local/lib/ppm.so +pwdCheckModuleArg:: bWluUXVhbGl0eSAzCmNoZWNrUkROIDAKZm9yYmlkZGVuQ2hhcnMKbWF4Q29uc2VjdXRpdmVQZXJDbGFzcyAwCnVzZUNyYWNrbGliIDAKY3JhY2tsaWJEaWN0IC92YXIvY2FjaGUvY3JhY2tsaWIvY3JhY2tsaWJfZGljdApjbGFzcy11cHBlckNhc2UgQUJDREVGR0hJSktMTU5PUFFSU1RVVldYWVogMCAxCmNsYXNzLWxvd2VyQ2FzZSBhYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3h5eiAwIDEKY2xhc3MtZGlnaXQgMDEyMzQ1Njc4OSAwIDEKY2xhc3Mtc3BlY2lhbCA8Piw/Oy46LyHCp8O5JSrCtV7CqCTCo8KyJsOpfiIjJ3soWy18w6hgX1zDp17DoEApXcKwPX0rIDAgMQ== +\f[R] +.fi +.PP +See \f[B]slapo-ppolicy\f[R] for more information, but to sum up: +.IP \[bu] 2 +enable ppolicy overlay in your database. +.IP \[bu] 2 +define a default password policy in OpenLDAP configuration or use +pwdPolicySubentry attribute to point to the given policy. +.PP +This example show the activation for a \f[B]slapd.conf\f[R] file (see +\f[B]slapd-config\f[R] and \f[B]slapo-ppolicy\f[R] for more information +for \f[B]cn=config\f[R] configuration) +.IP +.nf +\f[C] +overlay ppolicy +ppolicy_default \[dq]cn=default,ou=policies,dc=my-domain,dc=com\[dq] +#ppolicy_use_lockout # for having more infos about the lockout +\f[R] +.fi +.SH FEATURES +.PP +Here are the main features: +.IP \[bu] 2 +4 character classes are defined by default: upper case, lower case, +digits and special characters. +.IP \[bu] 2 +more character classes can be defined, just write your own. +.IP \[bu] 2 +passwords must match the amount of quality points. +A point is validated when at least m characters of the corresponding +character class are present in the password. +.IP \[bu] 2 +passwords must have at least n of the corresponding character class +present, else they are rejected. +.IP \[bu] 2 +the two previous criteria are checked against any specific character +class defined. +.IP \[bu] 2 +if a password contains any of the forbidden characters, then it is +rejected. +.IP \[bu] 2 +if a password contains tokens from the RDN, then it is rejected. +.IP \[bu] 2 +if a password does not pass cracklib check, then it is rejected. +.SH CONFIGURATION +.PP +Since OpenLDAP 2.5 version, ppm configuration is held in a binary +attribute of the password policy: \f[B]pwdCheckModuleArg\f[R] +.PP +The example file (\f[B]ETCDIR/ppm.example\f[R] by default) is to be +considered as an example configuration, to import in the +\f[B]pwdCheckModuleArg\f[R] attribute. +It is also used for testing passwords with the test program provided. +.PP +If for some reasons, any parameter is not found, it will be given its +default value. +.PP +Note: you can still compile ppm to use the configuration file, by +enabling \f[B]PPM_READ_FILE\f[R] in \f[B]ppm.h\f[R] (but this is +deprecated now). +If you decide to do so, you can use the \f[B]PPM_CONFIG_FILE\f[R] +environment variable for overloading the configuration file path. +.PP +The syntax of a configuration line is: +.IP +.nf +\f[C] +parameter value [min] [minForPoint] +\f[R] +.fi +.PP +with spaces being delimiters and Line Feed (LF) ending the line. +.PP +Parameter names \f[B]are\f[R] case sensitive. +.PP +Lines beginning by a \f[B]#\f[R] are considered as comments. +.PP +The default configuration is the following: +.IP +.nf +\f[C] +# minQuality parameter +# Format: +# minQuality [NUMBER] +# Description: +# One point is granted for each class for which MIN_FOR_POINT criteria is fulfilled. +# defines the minimum point numbers for the password to be accepted. +minQuality 3 + +# checkRDN parameter +# Format: +# checkRDN [0 | 1] +# Description: +# If set to 1, password must not contain a token from the RDN. +# Tokens are separated by the following delimiters : space tabulation _ - , ; \[Po] +checkRDN 0 + +# forbiddenChars parameter +# Format: +# forbiddenChars [CHARACTERS_FORBIDDEN] +# Description: +# Defines the forbidden characters list (no separator). +# If one of them is found in the password, then it is rejected. +forbiddenChars + +# maxConsecutivePerClass parameter +# Format: +# maxConsecutivePerClass [NUMBER] +# Description: +# Defines the maximum number of consecutive character allowed for any class +maxConsecutivePerClass 0 + +# useCracklib parameter +# Format: +# useCracklib [0 | 1] +# Description: +# If set to 1, the password must pass the cracklib check +useCracklib 0 + +# cracklibDict parameter +# Format: +# cracklibDict [path_to_cracklib_dictionary] +# Description: +# directory+filename-prefix that your version of CrackLib will go hunting for +# For example, /var/pw_dict resolves as /var/pw_dict.pwd, +# /var/pw_dict.pwi and /var/pw_dict.hwm dictionary files +cracklibDict /var/cache/cracklib/cracklib_dict + +# classes parameter +# Format: +# class-[CLASS_NAME] [CHARACTERS_DEFINING_CLASS] [MIN] [MIN_FOR_POINT] +# Description: +# [CHARACTERS_DEFINING_CLASS]: characters defining the class (no separator) +# [MIN]: If at least [MIN] characters of this class is not found in the password, then it is rejected +# [MIN_FOR_POINT]: one point is granted if password contains at least [MIN_FOR_POINT] character numbers of this class +class-upperCase ABCDEFGHIJKLMNOPQRSTUVWXYZ 0 1 +class-lowerCase abcdefghijklmnopqrstuvwxyz 0 1 +class-digit 0123456789 0 1 +class-special <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+ 0 1 +\f[R] +.fi +.SH EXAMPLE +.PP +With this policy: +.IP +.nf +\f[C] +minQuality 4 +forbiddenChars .?, +checkRDN 1 +class-upperCase ABCDEFGHIJKLMNOPQRSTUVWXYZ 0 5 +class-lowerCase abcdefghijklmnopqrstuvwxyz 0 12 +class-digit 0123456789 0 1 +class-special <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+ 0 1 +class-myClass :) 1 1\[ga]\[ga] +\f[R] +.fi +.PP +the password \f[B]ThereIsNoCowLevel)\f[R] is working, because: +.IP \[bu] 2 +it has 4 character classes validated : upper, lower, special, and +myClass +.IP \[bu] 2 +it has no character among .?, +.IP \[bu] 2 +it has at least one character among : or ) +.PP +but it won\[cq]t work for the user uid=John +Cowlevel,ou=people,cn=example,cn=com, because the token +\[lq]Cowlevel\[rq] from his RDN exists in the password (case +insensitive). +.SH LOGS +.PP +If a user password is rejected by \f[B]ppm\f[R], the user will get this +type of message: +.PP +Typical user message from ldappasswd(5): +.IP +.nf +\f[C] + Result: Constraint violation (19) + Additional info: Password for dn=\[rs]\[dq]%s\[rs]\[dq] does not pass required number of strength checks (2 of 3) +\f[R] +.fi +.PP +A more detailed message is written to the server log. +.PP +Server log: +.IP +.nf +\f[C] +Feb 26 14:46:10 debian-11-64 slapd[1981]: conn=1000 op=16 MOD dn=\[dq]uid=user,ou=persons,dc=my-domain,dc=com\[dq] +Feb 26 14:46:10 debian-11-64 slapd[1981]: conn=1000 op=16 MOD attr=userPassword +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: entry uid=user,ou=persons,dc=my-domain,dc=com +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Reading pwdCheckModuleArg attribute +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: RAW configuration: # minQuality parameter#012# Format:#012# minQuality [NUMBER]#012# Description:#012# One point is granted for each class for which MIN_FOR_POINT criteria is fulfilled.#012# defines the minimum point numbers for the password to be accepted.#012minQuality 3#012#012# checkRDN parameter#012# Format:#012# checkRDN [0 | 1]#012# Description:#012# If set to 1, password must not contain a token from the RDN.#012# Tokens are separated by the following delimiters : space tabulation _ - , ; \[Po]#012checkRDN 0#012#012# forbiddenChars parameter#012# Format:#012# forbiddenChars [CHARACTERS_FORBIDDEN]#012# Description:#012# Defines the forbidden characters list (no separator).#012# If one of them is found in the password, then it is rejected.#012forbiddenChars#012#012# maxConsecutivePerClass parameter#012# Format:#012# maxConsecutivePerClass [NUMBER]#012# Description:#012# Defines the maximum number of consecutive character allowed for any class#012maxConsecutivePerClass 0#012#012# useCracklib parameter#012# Format:#012# useCracklib [0 | 1]#012# Description:#012# If set to 1, the password must pass the cracklib check#012useCracklib 0#012#012# cracklibDict parameter#012# Format:#012# cracklibDict [path_to_cracklib_dictionary]#012# Description:#012# directory+filename-prefix that your version of CrackLib will go hunting for#012# For example, /var/pw_dict resolves as /var/pw_dict.pwd,#012# /var/pw_dict.pwi and /var/pw_dict.hwm dictionary files#012cracklibDict /var/cache/cracklib/cracklib_dict#012#012# classes parameter#012# Format:#012# class-[CLASS_NAME] [CHARACTERS_DEFINING_CLASS] [MIN] [MIN_FOR_POINT]#012# Description:#012# [CHARACTERS_DEFINING_CLASS]: characters defining the class (no separator)#012# [MIN]: If at least [MIN] characters of this class is not found in the password, then it is rejected#012# [MIN_FOR_POINT]: one point is granted if password contains at least [MIN_FOR_POINT] character numbers of this class#012class-upperCase ABCDEFGHIJKLMNOPQRSTUVWXYZ 0 1#012class-lowerCase abcdefghijklmnopqrstuvwxyz 0 1#012class-digit 0123456789 0 1#012class-special <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+ 0 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Parsing pwdCheckModuleArg attribute +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # minQuality parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # minQuality [NUMBER] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # One point is granted for each class for which MIN_FOR_POINT criteria is fulfilled. +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # defines the minimum point numbers for the password to be accepted. +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: minQuality 3 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = minQuality, value = 3, min = (null), minForPoint= (null) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: 3 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # checkRDN parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # checkRDN [0 | 1] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # If set to 1, password must not contain a token from the RDN. +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Tokens are separated by the following delimiters : space tabulation _ - , ; \[Po] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: checkRDN 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = checkRDN, value = 0, min = (null), minForPoint= (null) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # forbiddenChars parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # forbiddenChars [CHARACTERS_FORBIDDEN] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Defines the forbidden characters list (no separator). +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # If one of them is found in the password, then it is rejected. +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: forbiddenChars +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: No value, goto next parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # maxConsecutivePerClass parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # maxConsecutivePerClass [NUMBER] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Defines the maximum number of consecutive character allowed for any class +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: maxConsecutivePerClass 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = maxConsecutivePerClass, value = 0, min = (null), minForPoint= (null) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # useCracklib parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # useCracklib [0 | 1] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # If set to 1, the password must pass the cracklib check +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: useCracklib 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = useCracklib, value = 0, min = (null), minForPoint= (null) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: 0 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # cracklibDict parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # cracklibDict [path_to_cracklib_dictionary] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # directory+filename-prefix that your version of CrackLib will go hunting for +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # For example, /var/pw_dict resolves as /var/pw_dict.pwd, +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # /var/pw_dict.pwi and /var/pw_dict.hwm dictionary files +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: cracklibDict /var/cache/cracklib/cracklib_dict +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = cracklibDict, value = /var/cache/cracklib/cracklib_dict, min = (null), minForPoint= (null) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: /var/cache/cracklib/cracklib_dict +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # classes parameter +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Format: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # class-[CLASS_NAME] [CHARACTERS_DEFINING_CLASS] [MIN] [MIN_FOR_POINT] +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # Description: +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # [CHARACTERS_DEFINING_CLASS]: characters defining the class (no separator) +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # [MIN]: If at least [MIN] characters of this class is not found in the password, then it is rejected +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: # [MIN_FOR_POINT]: one point is granted if password contains at least [MIN_FOR_POINT] character numbers of this class +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: class-upperCase ABCDEFGHIJKLMNOPQRSTUVWXYZ 0 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = class-upperCase, value = ABCDEFGHIJKLMNOPQRSTUVWXYZ, min = 0, minForPoint= 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: ABCDEFGHIJKLMNOPQRSTUVWXYZ +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: class-lowerCase abcdefghijklmnopqrstuvwxyz 0 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = class-lowerCase, value = abcdefghijklmnopqrstuvwxyz, min = 0, minForPoint= 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: abcdefghijklmnopqrstuvwxyz +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: class-digit 0123456789 0 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = class-digit, value = 0123456789, min = 0, minForPoint= 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: 0123456789 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: get line: class-special <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+ 0 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Param = class-special, value = <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+, min = 0, minForPoint= 1 +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Accepted replaced value: <>,?;.:/!\[sc]\[`u]%*\[mc]\[ha]\[ad]$\[Po]\[S2]&\['e]\[ti]\[dq]#\[aq]{([-|\[`e]\[ga]_\[rs]\[,c]\[ha]\[`a]\[at])]\[de]=}+ +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: 1 point granted for class class-lowerCase +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: 1 point granted for class class-digit +Feb 26 14:46:10 debian-11-64 slapd[1981]: ppm: Reallocating szErrStr from 64 to 173 +Feb 26 14:46:10 debian-11-64 slapd[1981]: check_password_quality: module error: (/usr/local/lib/ppm.so) Password for dn=\[dq]uid=user,ou=persons,dc=my-domain,dc=com\[dq] does not pass required number of strength checks (2 of 3).[1] +Feb 26 14:46:10 debian-11-64 slapd[1981]: conn=1000 op=16 RESULT tag=103 err=19 qtime=0.000020 etime=0.001496 text=Password for dn=\[dq]uid=user,ou=persons,dc=my-domain,dc=com\[dq] does not pass required number of strength checks (2 of 3) +\f[R] +.fi +.SH TESTS +.PP +There is a unit test script: \f[B]unit_tests.sh\f[R] that illustrates +checking some passwords. +.PP +It is possible to test one particular password using directly the test +program: +.IP +.nf +\f[C] +cd /usr/local/lib +LD_LIBRARY_PATH=. ./ppm_test \[dq]uid=test,ou=users,dc=my-domain,dc=com\[dq] \[dq]my_password\[dq] \[dq]/usr/local/etc/openldap/ppm.example\[dq] && echo OK +\f[R] +.fi +.SH FILES +.PP +\f[B]ETCDIR/ppm.example\f[R] +.RS +.PP +example of ppm configuration to be inserted in +\f[B]pwdCheckModuleArg\f[R] attribute of given password policy +.RE +.PP +\f[B]ppm.so\f[R] +.RS +.PP +ppm library, loaded by the \f[B]pwdCheckModule\f[R] attribute of given +password policy +.RE +.PP +\f[B]ppm_test\f[R] +.RS +.PP +small test program for checking password in a command-line +.RE +.SH SEE ALSO +.PP +\f[B]slapo-ppolicy\f[R](5), \f[B]slapd-config\f[R](5), +\f[B]slapd.conf\f[R](5) +.SH ACKNOWLEDGEMENTS +.PP +This module was developed in 2014-2021 by David Coutadeur. |