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Merge pull request #571 from dkerr64/FreeDNS

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Add FreeDNS plugin support to acme.sh
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neil 2017-02-05 11:12:13 +08:00 committed by GitHub
commit 259cefab72
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1
README.md
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@ -270,6 +270,7 @@ You don't have to do anything manually!
1. ISPConfig 3.1 API
1. Alwaysdata.com API
1. Linode.com API
1. FreeDNS (https://freedns.afraid.org/)
**More APIs coming soon...**

27
dnsapi/README.md
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@ -278,6 +278,33 @@ acme.sh --issue --dns dns_linode --dnssleep 900 -d example.com -d www.example.co
The `LINODE_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
## 15. Use FreeDNS
FreeDNS (https://freedns.afraid.org/) does not provide an API to update DNS records (other than IPv4 and IPv6
dynamic DNS addresses). The acme.sh plugin therefore retrieves and updates domain TXT records by logging
into the FreeDNS website to read the HTML and posting updates as HTTP. The plugin needs to know your
userid and password for the FreeDNS website.
```sh
export FREEDNS_User="..."
export FREEDNS_Password="..."
```
You need only provide this the first time you run the acme.sh client with FreeDNS validation and then again
whenever you change your password at the FreeDNS site. The acme.sh FreeDNS plugin does not store your userid
or password but rather saves an authentication token returned by FreeDNS in `~/.acme.sh/account.conf` and
reuses that when needed.
Now you can issue a certificate.
```sh
acme.sh --issue --dns dns_freedns -d example.com -d www.example.com
```
Note that you cannot use acme.sh automatic DNS validation for FreeDNS public domains or for a subdomain that
you create under a FreeDNS public domain. You must own the top level domain in order to automaitcally
validate with acme.sh at FreeDNS.
# Use custom API
If your API is not supported yet, you can write your own DNS API.

375
dnsapi/dns_freedns.sh Executable file
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@ -0,0 +1,375 @@
#!/usr/bin/env sh
#This file name is "dns_freedns.sh"
#So, here must be a method dns_freedns_add()
#Which will be called by acme.sh to add the txt record to your api system.
#returns 0 means success, otherwise error.
#
#Author: David Kerr
#Report Bugs here: https://github.com/dkerr64/acme.sh
#
######## Public functions #####################
# Export FreeDNS userid and password in folowing variables...
# FREEDNS_User=username
# FREEDNS_Password=password
# login cookie is saved in acme account config file so userid / pw
# need to be set only when changed.
#Usage: dns_freedns_add _acme-challenge.www.domain.com "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
dns_freedns_add() {
fulldomain="$1"
txtvalue="$2"
_info "Add TXT record using FreeDNS"
_debug "fulldomain: $fulldomain"
_debug "txtvalue: $txtvalue"
if [ -z "$FREEDNS_User" ] || [ -z "$FREEDNS_Password" ]; then
FREEDNS_User=""
FREEDNS_Password=""
if [ -z "$FREEDNS_COOKIE" ]; then
_err "You did not specify the FreeDNS username and password yet."
_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
return 1
fi
using_cached_cookies="true"
else
FREEDNS_COOKIE="$(_freedns_login "$FREEDNS_User" "$FREEDNS_Password")"
if [ -z "$FREEDNS_COOKIE" ]; then
return 1
fi
using_cached_cookies="false"
fi
_debug "FreeDNS login cookies: $FREEDNS_COOKIE (cached = $using_cached_cookies)"
_saveaccountconf FREEDNS_COOKIE "$FREEDNS_COOKIE"
# split our full domain name into two parts...
i="$(echo "$fulldomain" | tr '.' ' ' | wc -w)"
i="$(_math "$i" - 1)"
top_domain="$(echo "$fulldomain" | cut -d. -f "$i"-100)"
i="$(_math "$i" - 1)"
sub_domain="$(echo "$fulldomain" | cut -d. -f -"$i")"
# Sometimes FreeDNS does not reurn the subdomain page but rather
# returns a page regarding becoming a premium member. This usually
# happens after a period of inactivity. Immediately trying again
# returns the correct subdomain page. So, we will try twice to
# load the page and obtain our domain ID
attempts=2
while [ "$attempts" -gt "0" ]; do
attempts="$(_math "$attempts" - 1)"
htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
if [ "$?" != "0" ]; then
if [ "$using_cached_cookies" = "true" ]; then
_err "Has your FreeDNS username and password channged? If so..."
_err "Please export as FREEDNS_User / FREEDNS_Password and try again."
fi
return 1
fi
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(echo "$htmlpage" \
| grep -i -e '</\?TABLE\|</\?TD\|</\?TR\|</\?TH' \
| sed 's/^[\ \t]*//g' \
| tr -d '\n' \
| sed 's/<\/TR[^>]*>/\n/Ig' \
| sed 's/<\/\?\(TABLE\|TR\)[^>]*>//Ig' \
| sed 's/^<T[DH][^>]*>\|<\/\?T[DH][^>]*>$//Ig' \
| sed 's/<\/T[DH][^>]*><T[DH][^>]*>/,/Ig' \
| grep 'edit.php?' \
| grep "$top_domain")"
# The above beauty ends with striping out rows that do not have an
# href to edit.php and do not have the top domain we are looking for.
# So all we should be left with is CSV of table of subdomains we are
# interested in.
# Now we have to read through this table and extract the data we need
lines="$(echo "$subdomain_csv" | wc -l)"
nl='
'
i=0
found=0
while [ "$i" -lt "$lines" ]; do
i="$(_math "$i" + 1)"
line="$(echo "$subdomain_csv" | cut -d "$nl" -f "$i")"
tmp="$(echo "$line" | cut -d ',' -f 1)"
if [ $found = 0 ] && _startswith "$tmp" "<td>$top_domain"; then
# this line will contain DNSdomainid for the top_domain
DNSdomainid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*domain_id=//;s/>.*//')"
found=1
else
# lines contain DNS records for all subdomains
DNSname="$(echo "$line" | cut -d ',' -f 2 | sed 's/^[^>]*>//;s/<\/a>.*//')"
DNStype="$(echo "$line" | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
DNSdataid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*data_id=//;s/>.*//')"
# Now get current value for the TXT record. This method may
# not produce accurate results as the value field is truncated
# on this webpage. To get full value we would need to load
# another page. However we don't really need this so long as
# there is only one TXT record for the acme chalenge subdomain.
DNSvalue="$(echo "$line" | cut -d ',' -f 4 | sed 's/^[^&quot;]*&quot;//;s/&quot;.*//;s/<\/td>.*//')"
if [ $found != 0 ]; then
break
# we are breaking out of the loop at the first match of DNS name
# and DNS type (if we are past finding the domainid). This assumes
# that there is only ever one TXT record for the LetsEncrypt/acme
# challenge subdomain. This seems to be a reasonable assumption
# as the acme client deletes the TXT record on successful validation.
fi
else
DNSname=""
DNStype=""
fi
fi
done
_debug "DNSname: $DNSname DNStype: $DNStype DNSdomainid: $DNSdomainid DNSdataid: $DNSdataid"
_debug "DNSvalue: $DNSvalue"
if [ -z "$DNSdomainid" ]; then
# If domain ID is empty then something went wrong (top level
# domain not found at FreeDNS).
if [ "$attempts" = "0" ]; then
# exhausted maximum retry attempts
_debug "$htmlpage"
_debug "$subdomain_csv"
_err "Domain $top_domain not found at FreeDNS"
return 1
fi
else
# break out of the 'retry' loop... we have found our domain ID
break
fi
_info "Domain $top_domain not found at FreeDNS"
_info "Retry loading subdomain page ($attempts attempts remaining)"
done
if [ -z "$DNSdataid" ]; then
# If data ID is empty then specific subdomain does not exist yet, need
# to create it this should always be the case as the acme client
# deletes the entry after domain is validated.
_freedns_add_txt_record "$FREEDNS_COOKIE" "$DNSdomainid" "$sub_domain" "$txtvalue"
return $?
else
if [ "$txtvalue" = "$DNSvalue" ]; then
# if value in TXT record matches value requested then DNS record
# does not need to be updated. But...
# Testing value match fails. Website is truncating the value field.
# So for now we will always go down the else path. Though in theory
# should never come here anyway as the acme client deletes
# the TXT record on successful validation, so we should not even
# have found a TXT record !!
_info "No update necessary for $fulldomain at FreeDNS"
return 0
else
# Delete the old TXT record (with the wrong value)
_freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"
if [ "$?" = "0" ]; then
# And add in new TXT record with the value provided
_freedns_add_txt_record "$FREEDNS_COOKIE" "$DNSdomainid" "$sub_domain" "$txtvalue"
fi
return $?
fi
fi
return 0
}
#Usage: fulldomain txtvalue
#Remove the txt record after validation.
dns_freedns_rm() {
fulldomain="$1"
txtvalue="$2"
_info "Delete TXT record using FreeDNS"
_debug "fulldomain: $fulldomain"
_debug "txtvalue: $txtvalue"
# Need to read cookie from conf file again in case new value set
# during login to FreeDNS when TXT record was created.
# acme.sh does not have a _readaccountconf() fuction
FREEDNS_COOKIE="$(_read_conf "$ACCOUNT_CONF_PATH" "FREEDNS_COOKIE")"
_debug "FreeDNS login cookies: $FREEDNS_COOKIE"
# Sometimes FreeDNS does not reurn the subdomain page but rather
# returns a page regarding becoming a premium member. This usually
# happens after a period of inactivity. Immediately trying again
# returns the correct subdomain page. So, we will try twice to
# load the page and obtain our TXT record.
attempts=2
while [ "$attempts" -gt "0" ]; do
attempts="$(_math "$attempts" - 1)"
htmlpage="$(_freedns_retrieve_subdomain_page "$FREEDNS_COOKIE")"
if [ "$?" != "0" ]; then
return 1
fi
# Now convert the tables in the HTML to CSV. This litte gem from
# http://stackoverflow.com/questions/1403087/how-can-i-convert-an-html-table-to-csv
subdomain_csv="$(echo "$htmlpage" \
| grep -i -e '</\?TABLE\|</\?TD\|</\?TR\|</\?TH' \
| sed 's/^[\ \t]*//g' \
| tr -d '\n' \
| sed 's/<\/TR[^>]*>/\n/Ig' \
| sed 's/<\/\?\(TABLE\|TR\)[^>]*>//Ig' \
| sed 's/^<T[DH][^>]*>\|<\/\?T[DH][^>]*>$//Ig' \
| sed 's/<\/T[DH][^>]*><T[DH][^>]*>/,/Ig' \
| grep 'edit.php?' \
| grep "$fulldomain")"
# The above beauty ends with striping out rows that do not have an
# href to edit.php and do not have the domain name we are looking for.
# So all we should be left with is CSV of table of subdomains we are
# interested in.
# Now we have to read through this table and extract the data we need
lines="$(echo "$subdomain_csv" | wc -l)"
nl='
'
i=0
found=0
while [ "$i" -lt "$lines" ]; do
i="$(_math "$i" + 1)"
line="$(echo "$subdomain_csv" | cut -d "$nl" -f "$i")"
DNSname="$(echo "$line" | cut -d ',' -f 2 | sed 's/^[^>]*>//;s/<\/a>.*//')"
DNStype="$(echo "$line" | cut -d ',' -f 3)"
if [ "$DNSname" = "$fulldomain" ] && [ "$DNStype" = "TXT" ]; then
DNSdataid="$(echo "$line" | cut -d ',' -f 2 | sed 's/^.*data_id=//;s/>.*//')"
DNSvalue="$(echo "$line" | cut -d ',' -f 4 | sed 's/^[^&quot;]*&quot;//;s/&quot;.*//;s/<\/td>.*//')"
_debug "DNSvalue: $DNSvalue"
# if [ "$DNSvalue" = "$txtvalue" ]; then
# Testing value match fails. Website is truncating the value
# field. So for now we will assume that there is only one TXT
# field for the sub domain and just delete it. Currently this
# is a safe assumption.
_freedns_delete_txt_record "$FREEDNS_COOKIE" "$DNSdataid"
return $?
# fi
fi
done
done
# If we get this far we did not find a match (after two attempts)
# Not necessarily an error, but log anyway.
_debug2 "$subdomain_csv"
_info "Cannot delete TXT record for $fulldomain/$txtvalue. Does not exist at FreeDNS"
return 0
}
#################### Private functions below ##################################
# usage: _freedns_login username password
# print string "cookie=value" etc.
# returns 0 success
_freedns_login() {
export _H1="Accept-Language:en-US"
username="$1"
password="$2"
url="https://freedns.afraid.org/zc.php?step=2"
_debug "Login to FreeDNS as user $username"
htmlpage="$(_post "username=$(printf '%s' "$username" | _url_encode)&password=$(printf '%s' "$password" | _url_encode)&submit=Login&action=auth" "$url")"
if [ "$?" != "0" ]; then
_err "FreeDNS login failed for user $username bad RC from _post"
return 1
fi
cookies="$(grep -i '^Set-Cookie.*dns_cookie.*$' "$HTTP_HEADER" | _head_n 1 | tr -d "\r\n" | cut -d " " -f 2)"
# if cookies is not empty then logon successful
if [ -z "$cookies" ]; then
_debug "$htmlpage"
_err "FreeDNS login failed for user $username. Check $HTTP_HEADER file"
return 1
fi
printf "%s" "$cookies"
return 0
}
# usage _freedns_retrieve_subdomain_page login_cookies
# echo page retrieved (html)
# returns 0 success
_freedns_retrieve_subdomain_page() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
url="https://freedns.afraid.org/subdomain/"
_debug "Retrieve subdmoain page from FreeDNS"
htmlpage="$(_get "$url")"
if [ "$?" != "0" ]; then
_err "FreeDNS retrieve subdomins failed bad RC from _get"
return 1
elif [ -z "$htmlpage" ]; then
_err "FreeDNS returned empty subdomain page"
return 1
fi
_debug2 "$htmlpage"
printf "%s" "$htmlpage"
return 0
}
# usage _freedns_add_txt_record login_cookies domain_id subdomain value
# returns 0 success
_freedns_add_txt_record() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
domain_id="$2"
subdomain="$3"
value="$(printf '%s' "$4" | _url_encode)"
url="http://freedns.afraid.org/subdomain/save.php?step=2"
htmlpage="$(_post "type=TXT&domain_id=$domain_id&subdomain=$subdomain&address=%22$value%22&send=Save%21" "$url")"
if [ "$?" != "0" ]; then
_err "FreeDNS failed to add TXT record for $subdomain bad RC from _post"
return 1
elif ! grep "200 OK" "$HTTP_HEADER" >/dev/null; then
_debug "$htmlpage"
_err "FreeDNS failed to add TXT record for $subdomain. Check $HTTP_HEADER file"
return 1
elif _contains "$htmlpage" "security code was incorrect"; then
_debug "$htmlpage"
_err "FreeDNS failed to add TXT record for $subdomain as FreeDNS requested seurity code"
_err "Note that you cannot use automatic DNS validation for FreeDNS public domains"
return 1
fi
_debug2 "$htmlpage"
_info "Added acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}
# usage _freedns_delete_txt_record login_cookies data_id
# returns 0 success
_freedns_delete_txt_record() {
export _H1="Cookie:$1"
export _H2="Accept-Language:en-US"
data_id="$2"
url="https://freedns.afraid.org/subdomain/delete2.php"
htmlheader="$(_get "$url?data_id%5B%5D=$data_id&submit=delete+selected" "onlyheader")"
if [ "$?" != "0" ]; then
_err "FreeDNS failed to delete TXT record for $data_id bad RC from _get"
return 1
elif ! _contains "$htmlheader" "200 OK"; then
_debug "$htmlheader"
_err "FreeDNS failed to delete TXT record $data_id"
return 1
fi
_info "Deleted acme challenge TXT record for $fulldomain at FreeDNS"
return 0
}