bash - Trouble logging in user using su and expect script -

-

i working on making website class log username , password, , takes page shows grades in class.

the website being run bash script, , hosted on machine users have username , password login.

i have script called calcgrade.sh calculate grades either user logged in, or user passed script argument.

so originally, going use command:

echo -e "$password\n" | sudo -sk -u $user ./website/calcgrade.sh

to run calcgrade.sh user of website. however, found out sudo asks password of user currently logged in, not target user trying run command as.

so after reading, found better option use su expect script, can't work. here code expect script (currently username , password hard coded in testing):

#!/usr/bin/expect  log_user 0  spawn /bin/su myusername expect "password: " send "mypassword" spawn "./website/calcgrade.sh"  interact

when run script, doesn't seem log in user su, goes on run calcgrade.sh account, rather user's.

do see wrong script? or can see better way want?

also, problem method calcgrade.sh supposed send output stderr, when run expect script, error messages sent website (the server works sending html website stdout). there way around this, or might better have expect script check su if username/password correct, , if so, run ./calcgrade.sh $user afterwards?

first of all, here's correct way want do:

  1. give web server user sudo permissions run ./website/calcgrade.sh user, without requiring password.
  2. have web server authenticate user see fit.
  3. have run sudo -u someuser ./website/calcgrade.sh, no password required.

now let's @ why approach didn't work:

it's commonly believed su switches user. not case. starts new shell running user.

this means can't spawn su otheruser, let finish, , afterwards spawn calcgrade.sh.

instead have run su otheruser, , send commands shell su starts:

#!/usr/bin/expect   log_user 0  spawn /bin/su someuser  expect "password: " send "somepassword\n"   # wait prompt , send command run expect "$" send "./website/calcgrade.sh\n" interact

Comments

Post a Comment

Popular posts from this blog

c++ - Delete matches in OpenCV (Keypoints and descriptors) -

-
i want check scene image against 2 train images. that, detect features , compute descriptors of both training images. before detecting, computing , matching scene image, delete matches of train1 , train2. because these matches won't facilitate matching of scene image train1 , train2. so, match train1 train2 , vector of matches trainidx , queryidx. how can delete these matches in keypoints-vector , descriptor matrix of train1 , train2? best regards, dwi i have done below: std::vector<cv::keypoint> keypoints[2]; cv::mat descriptor[2]; std::vector< cv::dmatch > matches; /* write code generate keypoints, descriptors , matches here... keypoint[0] -> train image 1 keypoints keypoint[1] -> train image 2 keypoints descriptor[0] -> train image 1 descriptors descriptor[1] -> train image 2 descriptors matches -> matched between train image 1 , 2 */ // logic keep unmatched keypoints , corresponding descriptor
Read more

java - Could not locate OpenAL library -

-
i writing game using slick2d library, uses lwjgl. lwjgl version 2.9.3. using netbeans 8. i tried adding sounds game, example music track on main menu. problem is, exception when run game, despite game still compiling , running except sound of course: sat mar 21 01:23:57 edt 2015 error:could not locate openal library. org.lwjgl.lwjglexception: not locate openal library. @ org.lwjgl.openal.al.create(al.java:156) @ org.lwjgl.openal.al.create(al.java:156) @ org.lwjgl.openal.al.create(al.java:102) @ org.lwjgl.openal.al.create(al.java:206) @ org.newdawn.slick.openal.soundstore$1.run(soundstore.java:295) @ java.security.accesscontroller.doprivileged(native method) @ org.newdawn.slick.openal.soundstore.init(soundstore.java:292) @ org.newdawn.slick.music.<init>(music.java:156) @ org.newdawn.slick.music.<init>(music.java:75) @ view.mainmenu.init(mainmenu.java:58) i didn't include rest of error states error happens in game code. the
Read more

sorting - opencl Bitonic sort with 64 bits keys -

-
i used nvidia sdk bitonic sort , works great me. 32 bits (uint) need ulong keys. have typically 2^14 keys @ time , power of 2. searched on not find kernel designed ulong. i tried modified nvidia sdk bitonic sort using ulong keys not work. kernel not crash after de call clenqueuendrangekernel got error : cl_invalid_command_queue can tell me how modify bitonic sort or radixsort, or can sort ulong keys? i running nvidia quadro 4000 opencl 1.1 cuda 6.5.20 full_profile used original nvidia sdk bitonicsort.cl i used"ulong" keys , value input , ouput instead of "uint" thanks helping i made work-around suit need. used 30 bits of key , 18 high bits of value sorting. changed comparators (2 lines): '#define mask 0xffffc000 // suit need from this: if( (*keya > *keyb) == dir ) this: if(((*keya > *keyb)||((*keya == *keyb)&&((*vala & mask)> (*valb & mask)))) == dir ) it works fine. but, still, it's work-a
Read more