|
|
Sponsored Content
Top Forums
Shell Programming and Scripting
Ssh to validate multiple remote hosts connection validation.
Post 303013275 by RudiC on Monday 19th of February 2018 05:16:31 AM
|
|
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hello all,
I connect usually to one enviornment "dev" daily and then ftp some files to some other enviorment "uat" and then login to "uat" and run some scripts to process these files.
I was thinking to automate the process, where running one script from "dev" will complete all task required... (11 Replies)
Discussion started by: RishiPahuja
11 Replies
2. Shell Programming and Scripting
Hi,
I am new to Shell Scripting. Can anybody help me in writing a Script Which Could Login from a Unix box to a Remote Unix box which accepts the user credentials automatically and display the result for checking the Disk Space Utilisation (Without running any SSH agent). (1 Reply)
Discussion started by: ajith_tg
1 Replies
3. Shell Programming and Scripting
Hi im trying to write a script to logon to list of servers with same userID. I have no option/plan to implement ssh-keygen sharing between the systems, so i have written script creating 2 files,
file1 holds list of hosts
host1
host2
host3
file2 has following script
for i in `cat file1`... (1 Reply)
Discussion started by: dreamaix
1 Replies
4. Shell Programming and Scripting
I have a script on about 15 hosts that I need to run for each host whenever I want (not crontab). Problem is, this script takes 5-10 mins to run for each host. Is there a way I can run the script in parallel for all the hosts instead of 1 at a time? Also, I'm remotely running the script on the... (3 Replies)
Discussion started by: mrskittles99
3 Replies
5. Shell Programming and Scripting
Hi There,
I have a file contaning some 100 servers names one by one the file called redhat_servers.txt
I want to prepare a script where it should give me the host name and kernal version.
I wrote like this,
#!/bin/bash
while read line
do
ssh $line "uname -nr"
done <... (3 Replies)
Discussion started by: kumar85shiv
3 Replies
6. UNIX for Dummies Questions & Answers
Hi guys - I am having a hard time trying to figure how to search for a certain string on config files hosted on multiple hosts.
This is an example:
Hostnames: myhost1.mycompany.com|myhost2.mycompany.com|myhost3.mycompany.com
String to search for: myipaddress.somehost.com
Directory... (9 Replies)
Discussion started by: DallasT
9 Replies
7. Shell Programming and Scripting
Hello,
I am trying to login to multiple servers and i have to run multiple loops to gather some details..Could you please help me out.
I am specifically facing issues while running for loops.
I have to run multiple for loops in else condition. but the below code is giving errors in for... (2 Replies)
Discussion started by: mohit_vardhani
2 Replies
8. UNIX for Beginners Questions & Answers
Hi,
I want to validate ssh connection one after one for multiple servers..... password less keys already setup but now i want to validate if ssh is working fine or not...
I have .sh script like below and i have servers.txt contains all the list of servers
#/bin/bash
for host in $(cat... (3 Replies)
Discussion started by: sreeram4
3 Replies
9. Shell Programming and Scripting
Hello all,
i'm trying to create a report by greping a pattern on multiple remote hosts and creta a simple report,
actually i did this, is ther any better way to do this.
#!/bin/bash
for host in `cat RemoteHosts`
do
ssh $host -C 'hostname 2>&1; grep ERROR /var/log/WebServer.log.2019-09-21... (0 Replies)
Discussion started by: charli1
0 Replies
10. Shell Programming and Scripting
Hi all,
i'm trying to gether multiple pattern on remote hosts, and trying to print hostname and the pattern,
ssh remoteserver1 -C 'hostname 2>&1;cat /var/log/server1.log | awk -F ";" '"'"'{ print " "$2" "$5}'"'"'| sort | uniq -c | sort -g -r '
The output is the following,
remoteserver1
... (8 Replies)
Discussion started by: charli1
8 Replies
LEARN ABOUT OPENDARWIN
rsautl
RSAUTL(1) OpenSSL RSAUTL(1) NAME
rsautl - RSA utility SYNOPSIS
openssl rsautl [-in file] [-out file] [-inkey file] [-pubin] [-certin] [-sign] [-verify] [-encrypt] [-decrypt] [-pkcs] [-ssl] [-raw] [-hex- dump] [-asn1parse] DESCRIPTION
The rsautl command can be used to sign, verify, encrypt and decrypt data using the RSA algorithm. COMMAND OPTIONS
-in filename This specifies the input filename to read data from or standard input if this option is not specified. -out filename specifies the output filename to write to or standard output by default. -inkey file the input key file, by default it should be an RSA private key. -pubin the input file is an RSA public key. -certin the input is a certificate containing an RSA public key. -sign sign the input data and output the signed result. This requires and RSA private key. -verify verify the input data and output the recovered data. -encrypt encrypt the input data using an RSA public key. -decrypt decrypt the input data using an RSA private key. -pkcs, -oaep, -ssl, -raw the padding to use: PKCS#1 v1.5 (the default), PKCS#1 OAEP, special padding used in SSL v2 backwards compatible handshakes, or no pad- ding, respectively. For signatures, only -pkcs and -raw can be used. -hexdump hex dump the output data. -asn1parse asn1parse the output data, this is useful when combined with the -verify option. NOTES
rsautl because it uses the RSA algorithm directly can only be used to sign or verify small pieces of data. EXAMPLES
Sign some data using a private key: openssl rsautl -sign -in file -inkey key.pem -out sig Recover the signed data openssl rsautl -verify -in sig -inkey key.pem Examine the raw signed data: openssl rsautl -verify -in file -inkey key.pem -raw -hexdump 0000 - 00 01 ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0010 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0020 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0030 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0040 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0050 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0060 - ff ff ff ff ff ff ff ff-ff ff ff ff ff ff ff ff ................ 0070 - ff ff ff ff 00 68 65 6c-6c 6f 20 77 6f 72 6c 64 .....hello world The PKCS#1 block formatting is evident from this. If this was done using encrypt and decrypt the block would have been of type 2 (the sec- ond byte) and random padding data visible instead of the 0xff bytes. It is possible to analyse the signature of certificates using this utility in conjunction with asn1parse. Consider the self signed example in certs/pca-cert.pem . Running asn1parse as follows yields: openssl asn1parse -in pca-cert.pem 0:d=0 hl=4 l= 742 cons: SEQUENCE 4:d=1 hl=4 l= 591 cons: SEQUENCE 8:d=2 hl=2 l= 3 cons: cont [ 0 ] 10:d=3 hl=2 l= 1 prim: INTEGER :02 13:d=2 hl=2 l= 1 prim: INTEGER :00 16:d=2 hl=2 l= 13 cons: SEQUENCE 18:d=3 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 29:d=3 hl=2 l= 0 prim: NULL 31:d=2 hl=2 l= 92 cons: SEQUENCE 33:d=3 hl=2 l= 11 cons: SET 35:d=4 hl=2 l= 9 cons: SEQUENCE 37:d=5 hl=2 l= 3 prim: OBJECT :countryName 42:d=5 hl=2 l= 2 prim: PRINTABLESTRING :AU .... 599:d=1 hl=2 l= 13 cons: SEQUENCE 601:d=2 hl=2 l= 9 prim: OBJECT :md5WithRSAEncryption 612:d=2 hl=2 l= 0 prim: NULL 614:d=1 hl=3 l= 129 prim: BIT STRING The final BIT STRING contains the actual signature. It can be extracted with: openssl asn1parse -in pca-cert.pem -out sig -noout -strparse 614 The certificate public key can be extracted with: openssl x509 -in test/testx509.pem -pubout -noout >pubkey.pem The signature can be analysed with: openssl rsautl -in sig -verify -asn1parse -inkey pubkey.pem -pubin 0:d=0 hl=2 l= 32 cons: SEQUENCE 2:d=1 hl=2 l= 12 cons: SEQUENCE 4:d=2 hl=2 l= 8 prim: OBJECT :md5 14:d=2 hl=2 l= 0 prim: NULL 16:d=1 hl=2 l= 16 prim: OCTET STRING 0000 - f3 46 9e aa 1a 4a 73 c9-37 ea 93 00 48 25 08 b5 .F...Js.7...H%.. This is the parsed version of an ASN1 DigestInfo structure. It can be seen that the digest used was md5. The actual part of the certificate that was signed can be extracted with: openssl asn1parse -in pca-cert.pem -out tbs -noout -strparse 4 and its digest computed with: openssl md5 -c tbs MD5(tbs)= f3:46:9e:aa:1a:4a:73:c9:37:ea:93:00:48:25:08:b5 which it can be seen agrees with the recovered value above. SEE ALSO
dgst(1), rsa(1), genrsa(1) 0.9.7d 2002-04-30 RSAUTL(1)