subprocess.Popen keeps on asking password for ssh-copy-id command

I have gone through multiple threads which has similar questions (Use subprocess to send a password) and have tried number of things but still i am not able to get it to work. Basically i want to push my ssh-keys to a bunch of machines and i am trying to do that with subprocess. But somehow subprocess.Popen fails to get the password and hence it gets stuck.

Below are some of things I have tried.

from subprocess import Popen, PIPE



p = Popen(['ssh-copy-id', 'testbox1'], stdin=PIPE, stdout=PIPE).communicate(input=b'mypassword')

I have also tried supplying the password by writing to process's stdin channel like below

p.stdin.write(b'mypassword')

p.stdin.flush()

I have tried this in both python 2.7 and python and it didn't work. I have also tried providing a linefeed as well after the password but even that didn't work. I am not sure what i am missing here.

I know people have suggested to use Pexpect for this but then again i am more keen in knowing why subprocess can't handle this.

I know there are multiple libraries like Paramiko and also fabric which handles remote connections with much ease, but i don't think that can be used in this case as i am not directly sshing to a machine and rather using ssh-copy-id command from my local machine

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

I would do some debugging first. See unix.stackexchange.com/questions/36540/… for a decent starting place.

– Chris Beard
Nov 28 '18 at 14:08

1

you could try p.stdin.write(b'mypasswordn') (with a linefeed). But those silent entry methods are sometimes more low-level, and it doesn't work. Check if the command doesn't take a password as parameter (plink from Putty does)

– Jean-François Fabre♦
Nov 28 '18 at 14:09

@Jean-FrançoisFabre i tried with linefeed as well and it didn't work.

– Rohit
Nov 28 '18 at 14:16

@Rohit Give this a try? serverfault.com/a/306675

– Chris Beard
Nov 28 '18 at 14:17

1

ssh-copy-id isn't reading from standard input; it's trying to read directly from the terminal.

– chepner
Nov 28 '18 at 14:22

|
show 8 more comments

Below are some of things I have tried.

from subprocess import Popen, PIPE



p = Popen(['ssh-copy-id', 'testbox1'], stdin=PIPE, stdout=PIPE).communicate(input=b'mypassword')

I have also tried supplying the password by writing to process's stdin channel like below

p.stdin.write(b'mypassword')

p.stdin.flush()

I have tried this in both python 2.7 and python and it didn't work. I have also tried providing a linefeed as well after the password but even that didn't work. I am not sure what i am missing here.

I know people have suggested to use Pexpect for this but then again i am more keen in knowing why subprocess can't handle this.

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

I would do some debugging first. See unix.stackexchange.com/questions/36540/… for a decent starting place.

– Chris Beard
Nov 28 '18 at 14:08

1

you could try p.stdin.write(b'mypasswordn') (with a linefeed). But those silent entry methods are sometimes more low-level, and it doesn't work. Check if the command doesn't take a password as parameter (plink from Putty does)

– Jean-François Fabre♦
Nov 28 '18 at 14:09

@Jean-FrançoisFabre i tried with linefeed as well and it didn't work.

– Rohit
Nov 28 '18 at 14:16

@Rohit Give this a try? serverfault.com/a/306675

– Chris Beard
Nov 28 '18 at 14:17

1

ssh-copy-id isn't reading from standard input; it's trying to read directly from the terminal.

– chepner
Nov 28 '18 at 14:22

|
show 8 more comments

Below are some of things I have tried.

from subprocess import Popen, PIPE



p = Popen(['ssh-copy-id', 'testbox1'], stdin=PIPE, stdout=PIPE).communicate(input=b'mypassword')

I have also tried supplying the password by writing to process's stdin channel like below

p.stdin.write(b'mypassword')

p.stdin.flush()

I have tried this in both python 2.7 and python and it didn't work. I have also tried providing a linefeed as well after the password but even that didn't work. I am not sure what i am missing here.

I know people have suggested to use Pexpect for this but then again i am more keen in knowing why subprocess can't handle this.

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

Below are some of things I have tried.

from subprocess import Popen, PIPE



p = Popen(['ssh-copy-id', 'testbox1'], stdin=PIPE, stdout=PIPE).communicate(input=b'mypassword')

I have also tried supplying the password by writing to process's stdin channel like below

p.stdin.write(b'mypassword')

p.stdin.flush()

I have tried this in both python 2.7 and python and it didn't work. I have also tried providing a linefeed as well after the password but even that didn't work. I am not sure what i am missing here.

I know people have suggested to use Pexpect for this but then again i am more keen in knowing why subprocess can't handle this.

python ssh subprocess

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

edited Nov 28 '18 at 15:32

Jean-François Fabre♦

106k1057115

asked Nov 28 '18 at 14:01

Rohit

895216

asked Nov 28 '18 at 14:01

Rohit

895216

asked Nov 28 '18 at 14:01

Rohit

895216

I would do some debugging first. See unix.stackexchange.com/questions/36540/… for a decent starting place.

– Chris Beard
Nov 28 '18 at 14:08

1

you could try p.stdin.write(b'mypasswordn') (with a linefeed). But those silent entry methods are sometimes more low-level, and it doesn't work. Check if the command doesn't take a password as parameter (plink from Putty does)

– Jean-François Fabre♦
Nov 28 '18 at 14:09

@Jean-FrançoisFabre i tried with linefeed as well and it didn't work.

– Rohit
Nov 28 '18 at 14:16

@Rohit Give this a try? serverfault.com/a/306675

– Chris Beard
Nov 28 '18 at 14:17

1

ssh-copy-id isn't reading from standard input; it's trying to read directly from the terminal.

– chepner
Nov 28 '18 at 14:22

|
show 8 more comments

I would do some debugging first. See unix.stackexchange.com/questions/36540/… for a decent starting place.

– Chris Beard
Nov 28 '18 at 14:08

1

you could try p.stdin.write(b'mypasswordn') (with a linefeed). But those silent entry methods are sometimes more low-level, and it doesn't work. Check if the command doesn't take a password as parameter (plink from Putty does)

– Jean-François Fabre♦
Nov 28 '18 at 14:09

@Jean-FrançoisFabre i tried with linefeed as well and it didn't work.

– Rohit
Nov 28 '18 at 14:16

@Rohit Give this a try? serverfault.com/a/306675

– Chris Beard
Nov 28 '18 at 14:17

1

ssh-copy-id isn't reading from standard input; it's trying to read directly from the terminal.

– chepner
Nov 28 '18 at 14:22

I would do some debugging first. See unix.stackexchange.com/questions/36540/… for a decent starting place.

– Chris Beard
Nov 28 '18 at 14:08

you could try p.stdin.write(b'mypasswordn') (with a linefeed). But those silent entry methods are sometimes more low-level, and it doesn't work. Check if the command doesn't take a password as parameter (plink from Putty does)

– Jean-François Fabre♦
Nov 28 '18 at 14:09

@Jean-FrançoisFabre i tried with linefeed as well and it didn't work.

– Rohit
Nov 28 '18 at 14:16

@Rohit Give this a try? serverfault.com/a/306675

– Chris Beard
Nov 28 '18 at 14:17

ssh-copy-id isn't reading from standard input; it's trying to read directly from the terminal.

– chepner
Nov 28 '18 at 14:22

|
show 8 more comments

1 Answer
1

active

oldest

votes

It seemed it was way to tricky to be handled with subprocess and hence i had to pexpect to solve this and it worked in first go.

import pexpect

from getpass import getpass



pwd = getpass("password: ")



child = pexpect.spawn('ssh-copy-id testbox1')

child.expect('.*ssword.*:')

child.sendline(pwd)

child.expect(pexpect.EOF, timeout=None)

cmd_show_data = child.before

cmd_output = cmd_show_data.split('rn')

for data in cmd_output:

    print data

answered Nov 28 '18 at 15:15

Rohit

895216

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

add a comment |

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1 Answer
1

active

oldest

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1 Answer
1

active

oldest

votes

It seemed it was way to tricky to be handled with subprocess and hence i had to pexpect to solve this and it worked in first go.

import pexpect

from getpass import getpass



pwd = getpass("password: ")



child = pexpect.spawn('ssh-copy-id testbox1')

child.expect('.*ssword.*:')

child.sendline(pwd)

child.expect(pexpect.EOF, timeout=None)

cmd_show_data = child.before

cmd_output = cmd_show_data.split('rn')

for data in cmd_output:

    print data

answered Nov 28 '18 at 15:15

Rohit

895216

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

add a comment |

It seemed it was way to tricky to be handled with subprocess and hence i had to pexpect to solve this and it worked in first go.

import pexpect

from getpass import getpass



pwd = getpass("password: ")



child = pexpect.spawn('ssh-copy-id testbox1')

child.expect('.*ssword.*:')

child.sendline(pwd)

child.expect(pexpect.EOF, timeout=None)

cmd_show_data = child.before

cmd_output = cmd_show_data.split('rn')

for data in cmd_output:

    print data

answered Nov 28 '18 at 15:15

Rohit

895216

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

add a comment |

It seemed it was way to tricky to be handled with subprocess and hence i had to pexpect to solve this and it worked in first go.

import pexpect

from getpass import getpass



pwd = getpass("password: ")



child = pexpect.spawn('ssh-copy-id testbox1')

child.expect('.*ssword.*:')

child.sendline(pwd)

child.expect(pexpect.EOF, timeout=None)

cmd_show_data = child.before

cmd_output = cmd_show_data.split('rn')

for data in cmd_output:

    print data

answered Nov 28 '18 at 15:15

Rohit

895216

It seemed it was way to tricky to be handled with subprocess and hence i had to pexpect to solve this and it worked in first go.

import pexpect

from getpass import getpass



pwd = getpass("password: ")



child = pexpect.spawn('ssh-copy-id testbox1')

child.expect('.*ssword.*:')

child.sendline(pwd)

child.expect(pexpect.EOF, timeout=None)

cmd_show_data = child.before

cmd_output = cmd_show_data.split('rn')

for data in cmd_output:

    print data

answered Nov 28 '18 at 15:15

Rohit

895216

answered Nov 28 '18 at 15:15

Rohit

895216

answered Nov 28 '18 at 15:15

Rohit

895216

answered Nov 28 '18 at 15:15

Rohit

895216

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

add a comment |

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

good call. Edited your question title for future readers/searchers.

– Jean-François Fabre♦
Nov 28 '18 at 15:32

add a comment |

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