X-Git-Url: https://sipb.mit.edu/gitweb.cgi/wiki.git/blobdiff_plain/b3725891cd0bb6d80471552a3acdc10a80628fda..192994d6c9d2b1472b99a8fb9c0bf67786bd1535:/doc/afs-and-you.html diff --git a/doc/afs-and-you.html b/doc/afs-and-you.html index 2deaf64..1bf75b2 100644 --- a/doc/afs-and-you.html +++ b/doc/afs-and-you.html @@ -19,7 +19,7 @@
-AFS (previously the Andrew File System or ) is a distributed network file system invented at Carnegie Mellon University as part of Project Andrew (approximately their equivalent of MIT's Project Athena). More importantly, it is the file system used to store most files on Athena today. This includes your personal home directory, the data and websites of many living groups and student groups on campus, and probably some of the software you run (if you ever use Athena clusters). (Though most user directories were migrated from NFS in the summer of 1992, some files still remain on NFS and, of course, various file systems are used on personal computers and servers.) +AFS (previously the Andrew File System or ) is a distributed network file system invented at Carnegie Mellon University as part of Project Andrew (approximately their equivalent of MIT's Project Athena). More importantly, it is the file system used to store most files on Athena today. This includes your personal home directory, the data and websites of many living groups and student groups on campus, and probably some of the software you run (if you ever use Athena clusters). (Though most user directories were migrated from NFS in the summer of 1992, some files still remain on NFS and, of course, various file systems are used on personal computers and servers.)
@@ -80,7 +80,7 @@ By default, this directory can only be read and can only be listed by you This folder is a link to a read-only copy of a backup of your files (created nightly around 3 a.m.). This copy cannot be edited and does not count against the locker's quota. From a technical standpoint, this is a separate volume with .backup appended (e.g. user.<username>.backup ) and is stored only as changes against the current copy.
-Generally any locker that you would access on Athena as /mit/<locker> is accessible on the web as http://web.mit.edu/<locker>. For example, the barnowl locker is at http://web.mit.edu/barnowl. As you can see, if there is no index.html (see below), the files in the directory are listed. By default, however, none of the contents are readable except in the www and Public folders. +Generally any locker that you would access on Athena as /mit/<locker> is accessible on the web as https://web.mit.edu/<locker>. For example, the barnowl locker is at https://web.mit.edu/barnowl. As you can see, if there is no index.html (see below), the files in the directory are listed. By default, however, none of the contents are readable except in the www and Public folders.
-Also, you may access something in one of the MIT AFS cells by typing its full AFS path after web.mit.edu (http://web.mit.edu/afs/athena.mit.edu/activity/c/chess-club). (That link also shows that if you have a text file named README readable, as a link to Public/README for example, its contents will be displayed below the directory listing). +Also, you may access something in one of the MIT AFS cells by typing its full AFS path after web.mit.edu (https://web.mit.edu/afs/athena.mit.edu/activity/c/chess-club). (That link also shows that if you have a text file named README readable, as a link to Public/README for example, its contents will be displayed below the directory listing). -Note that when accessed from web.mit.edu (or www.mit.edu), only static files may be shown. If you are interested in serving dynamic content (such as a blog or wiki using PHP, Perl, Python, Ruby, etc.), you should check out SIPB's Scripts dynamic web service. See http://scripts.mit.edu for more information. +Note that when accessed from web.mit.edu (or www.mit.edu), only static files may be shown. If you are interested in serving dynamic content (such as a blog or wiki using PHP, Perl, Python, Ruby, etc.), you should check out SIPB's Scripts dynamic web service. See https://scripts.mit.edu for more information.
@@ -122,10 +122,10 @@ If this information is good enough for you, then you are done. If not, read on.
You may be familiar with Unix permissions. Sad to say, but that knowledge is more or less useless here. While Unix permissions are per-file, AFS permissions are controlled by Access Control Lists (ACLs) on a per-directory basis. (AFS does however, attend to the e
-To view the ACL for a given directory (where you have permission to do so), run fs listacl or fs la, for short. For a typical user locker, the ACL in the top level will look like this +To view the ACL for a given directory (where you have permission to do so), run fs listacl, or fs la for short. For a typical user locker, the ACL in the top level will look like this
-user@host:~$ fs la +user@host:~$ fs listacl Access list for . is Normal rights: system:expunge ld @@ -152,7 +152,7 @@ This is a list of users or AFS groups and thei To add a user or group to the ACL for a given directory simply run fs setacl or fs sa as follows: -fs sa <directory> <user or group> <permissions> [<user or group> <permissions>]* +fs setacl -dir <directory> [<directory>]* -acl <user or group> <permissions> [<user or group> <permissions>]*
user@host:~$ cd awesome_project/ -user@host:~/awesome_project$ fs sa . system:anyuser read -user@host:~/awesome_project$ fs sa . jarandom write -user@host:~/awesome_project$ fs sa . sipbtest write -user@host:~/awesome_project$ #alternatively: fs sa . system:anyuser read jarandom write sipbtest write -user@host:~/awesome_project$ fs la +user@host:~/awesome_project$ fs setacl -dir . -acl system:anyuser read +user@host:~/awesome_project$ fs setacl -dir . -acl jarandom write +user@host:~/awesome_project$ fs setacl -dir . -acl sipbtest write +user@host:~/awesome_project$ #alternatively: fs setacl -dir . -acl system:anyuser read jarandom write sipbtest write +user@host:~/awesome_project$ fs listacl Access list for . is Normal rights: system:expunge ld @@ -183,13 +183,13 @@ user@host:~/awesome_project$
See also: man 1 fs, fs help <command>, man fs_listacl. -There is also such thing as negative permissions to deny rights to certain members of a larger group to which positive permissions are granted. In the words of the fs_setacl manpage, however,
Setting negative permissions is generally unnecessary and not recommended. Simply omitting a user or group from the "Normal rights" section of the ACL is normally adequate to prevent access. In particular, note that it is futile to deny permissions that are granted to members of the system:anyuser group on the same ACL; the user needs only to issue the unlog command to receive the denied permissions.For an example of negative permissions used on Athena run fs la /afs/athena.mit.edu/contrib/games/. +There is also such thing as negative permissions to deny rights to certain members of a larger group to which positive permissions are granted. In the words of the fs_setacl manpage, however,
Setting negative permissions is generally unnecessary and not recommended. Simply omitting a user or group from the "Normal rights" section of the ACL is normally adequate to prevent access. In particular, note that it is futile to deny permissions that are granted to members of the system:anyuser group on the same ACL; the user needs only to issue the unlog command to receive the denied permissions.For an example of negative permissions used on Athena run fs listacl /afs/athena.mit.edu/contrib/games/.
-The "normal" way to make an AFS group would be with a command similar to pts creategroup <your user name>:<group name> and then add people with pts adduser <user> <full group name>(e.g. If Donald Guy wanted to created a group for people to edit his www directory (including sipbtest and jflorey, he might use the following chain of commands pts creategroup fawkes:www ; pts adduser sipbtest fawkes:www; pts adduser jflorey fawkes:www; fs sa /mit/fawkes/www fawkes:www write +The "normal" way to make an AFS group would be with a command similar to pts creategroup <your user name>:<group name> and then add people with pts adduser <user> <full group name>(e.g. If Donald Guy wanted to created a group for people to edit his www directory (including sipbtest and jflorey, he might use the following chain of commands pts creategroup fawkes:www; pts adduser sipbtest fawkes:www; pts adduser jflorey fawkes:www; fs setacl -dir /mit/fawkes/www -acl fawkes:www write
You can see general information about a group by running pts examine <group> and see the membership of a group by running pts membership <group>. In the above example: @@ -197,7 +197,7 @@ You can see general information about a group by running pts examine <gro fawkes@dr-wily:~$ pts examine fawkes:www Name: fawkes:www, id: -33555072, owner: fawkes, creator: fawkes, membership: 2, flags: S-M--, group quota: 0. -fawkes@dr-wily:~$ pts mem fawkes:www +fawkes@dr-wily:~$ pts membership fawkes:www Members of fawkes:www (id: -33555072) are: jflorey sipbtest @@ -219,38 +219,31 @@ see also: man 1 pts
-If you make a directory listable and readable by system:anyuser then it can be viewed by any user on the web via the UTLs mentioned above +If you make a directory listable and readable by system:anyuser then it can be viewed by any user on the web via the URLs mentioned above
Unfortunately, adding specific users to an AFS ACL does not mean they can see the folder when they access it from the web. IS&T, however, does provide a solution to this. First, make sure that the wanted directory is not readable by system:anyuser. Create a file named .htaccess.mit in that directory. In that file you can do one of three things,
<limit GET> - require valid-user - </limit> +require valid-user
<limit GET> - require user fawkes jflorey sipbtest jarandom - </limit> - +require user fawkes jflorey sipbtest jarandom
<limit GET> - require group sipb-staff sipb-prospectives - </limit> +require group sipb-staff sipb-prospectives
-
Note that you cannot mix users and groups in the same directory
. +Note that you cannot mix users and groups in the same directory.
-Finally fs sa <dir> system:htaccess.mit read .
+Finally fs setacl -dir <dir> -acl system:htaccess.mit read.
Thereafter, the users should be able to get to the folders at https://web.mit.edu/<locker>/<path to folder> if they have certificates and no one should be able to reach it via http. Make sure to add yourself if you are going to be accessing it.-see also: http://ist.mit.edu/services/web/reference/web-resources/https +see also: https://ist.mit.edu/services/web/reference/web-resources/https
There are two likely possibilities. First, its likely that your tokens may have expired. You can check this by running tokens. If they are, in fact, expired (or missing) get new tokens as follows: first, make sure you have valid kerberos tickets and then run aklog. Another possibility is that you have tokens but not for the correct cell. tokens will tell you what tokens you already have. In all likelihood, if you are reading this, you probably want aklog athena sipb. Finally, a third possibility is that your group membership has changed since you acquired tokens. Try running aklog -force
@@ -262,10 +255,10 @@ What you don't want to do is take away the l permission from <html>
<head>
- <meta http-equiv="Refresh" content="0; url=http://web.mit.edu/<lockername>/www">
+ <meta http-equiv="Refresh" content="0; url=https://web.mit.edu/<lockername>/www">
</head>
<body>
- <p>Please go to my <a href="http://web.mit.edu/<lockername>/www">www/a>!</p>
+ <p>Please go to my <a href="https://web.mit.edu/<lockername>/www">www</a>!</p>
</body>
</html>
@@ -279,7 +272,7 @@ Most AFS servers restart weekly at 6 AM on Sunday.
-There may be a non-scheduled AFS outage. Check 3down, hopefully it will be back up soon :-(. You can check up on the AFS servers by running fs checkservers (or fs checks). If there is no reported outage and you can't access the AFS servers (but can access the rest of the net), contact OLC. +There may be a non-scheduled AFS outage. Check 3down, hopefully it will be back up soon :-(. You can check up on the AFS servers by running fs checkservers (or fs checks). If there is no reported outage and you can't access the AFS servers (but can access the rest of the net), contact OLC.
Figure out the volume name of the locker. One way to do this is to run fs lq . in the directory and look in the left column. Once you have the volume name, run vos examine <volume name>. This will tell you information such as what server it is located on, its ID numbers, when it was last accessed, when it was last backed up, etc. For example: +
Figure out the volume name of the locker. One way to do this is to run fs listquota . in the directory and look in the left column. Once you have the volume name, run vos examine <volume name>. This will tell you information such as what server it is located on, its ID numbers, when it was last accessed, when it was last backed up, etc. For example:
$ vos examine user.sipbtest user.sipbtest 537058147 RW 69785 K On-line @@ -348,6 +341,6 @@ user.sipbtest 537058147 RW 69785 K On-lineSee Also
-SIPB's older guide, Inessential AFS
OpenAFS documentation at http://www.openafs.org/ +SIPB's older guide, Inessential AFS
OpenAFS documentation at https://www.openafs.org/