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Validate ENV/LABEL Change options in varlink

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If you pass in an invalid CHANGE ENV or LABEL option without the "=" character
podman crashes.

I see that there were other problems with the handling of commit --change handling.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
This commit is contained in:
Daniel J Walsh
2019-04-07 05:47:24 -04:00
parent 9acc9cd58c
commit cd952068f3
1 changed files with 34 additions and 5 deletions
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39
libpod/container_commit.go
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@ -3,6 +3,7 @@ package libpod
import (
"context"
"fmt"
"os"
"strings"
"github.com/containers/buildah"
@ -126,18 +127,40 @@ func (c *Container) Commit(ctx context.Context, destImage string, options Contai
// Process user changes
for _, change := range options.Changes {
splitChange := strings.Split(change, "=")
splitChange := strings.SplitN(change, " ", 2)
if len(splitChange) != 2 {
splitChange = strings.SplitN(change, "=", 2)
if len(splitChange) < 2 {
return nil, errors.Errorf("invalid change %s format", change)
}
}
change := strings.Split(splitChange[1], " ")
switch strings.ToUpper(splitChange[0]) {
case "CMD":
importBuilder.SetCmd(splitChange[1:])
importBuilder.SetCmd(change)
case "ENTRYPOINT":
importBuilder.SetEntrypoint(splitChange[1:])
importBuilder.SetEntrypoint(change)
case "ENV":
name := change[0]
val := ""
if len(change) < 2 {
change = strings.Split(change[0], "=")
}
if len(change) < 2 {
var ok bool
val, ok = os.LookupEnv(name)
if !ok {
return nil, errors.Errorf("invalid env variable %q: not defined in your environment", name)
}
} else {
val = strings.Join(change[1:], " ")
}
if !isEnvCleared { // Multiple values are valid, only clear once.
importBuilder.ClearEnv()
isEnvCleared = true
}
importBuilder.SetEnv(splitChange[1], splitChange[2])
importBuilder.SetEnv(name, val)
case "EXPOSE":
if !isExposeCleared { // Multiple values are valid, only clear once
importBuilder.ClearPorts()
@ -145,11 +168,17 @@ func (c *Container) Commit(ctx context.Context, destImage string, options Contai
}
importBuilder.SetPort(splitChange[1])
case "LABEL":
if len(change) < 2 {
change = strings.Split(change[0], "=")
}
if len(change) < 2 {
return nil, errors.Errorf("invalid label %s format, requires to NAME=VAL", splitChange[1])
}
if !isLabelCleared { // multiple values are valid, only clear once
importBuilder.ClearLabels()
isLabelCleared = true
}
importBuilder.SetLabel(splitChange[1], splitChange[2])
importBuilder.SetLabel(change[0], strings.Join(change[1:], " "))
case "ONBUILD":
importBuilder.SetOnBuild(splitChange[1])
case "STOPSIGNAL":